Effects of Dietary Octacosanol on Growth Performance,  Carcass Characteristics and Meat Quality of Broiler Chicks

L. Long; S. G. Wu; F. Yuan; J. Wang; H. J. Zhang; G. H. Qi

doi:10.5713/ajas.15.0879

Anim Biosci > Volume 29(10); 2016 > Article

Long, Wu, Yuan, Wang, Zhang, and Qi: Effects of Dietary Octacosanol on Growth Performance, Carcass Characteristics and Meat Quality of Broiler Chicks

Article

Asian-Australasian Journal of Animal Sciences (AJAS) 2016; 29(10): 1470-1476.

Published online: May 12, 2016

https://doi.org/10.5713/ajas.15.0879

Effects of Dietary Octacosanol on Growth Performance, Carcass Characteristics and Meat Quality of Broiler Chicks

L. Long^1,², S. G. Wu¹, F. Yuan², J. Wang¹, H. J. Zhang¹, G. H. Qi^1,^*

¹Key Laboratory of Feed Biotechnology of Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, Beijing 100081, China

²Tianjin Naer Biotechnology Co., Ltd., Tianjin 300457, China

^*Corresponding Author: G. H. Qi.
Tel: +86-10-82107317, Fax: +86-10-82106054, E-mail: qiguanghai@caas.cn

Received October 26, 2015 Revised March 19, 2016 Accepted April 22, 2016

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Octacosanol, which has prominent physiological activities and functions, has been recognized as a potential growth promoter in animals. A total of 392 1-d-old male Arbor Acres broiler chicks with similar body weight were randomly distributed into four dietary groups of seven replicates with 14 birds each supplemented with 0, 12, 24, or 36 mg octacosanol (extracted from rice bran, purity >92%)/kg feed. The feeding trial lasted for six weeks and was divided into the starter (day 1 to 21) and the grower (day 22 to 42) phases. The results showed that the feed conversion ratio (FCR) was significantly improved in broilers fed a diet containing 24 mg/kg octacosanol compared with those fed the control diet in the overall phase (day 1 to 42, p = 0.042). The average daily gain and FCR both showed linear effects in response to dietary supplementation of octacosanol during the overall phase (p = 0.031 and 0.018, respectively). Broilers fed with 24 or 36 mg/kg octacosanol diet showed a higher eviscerated yield, which increased by 5.88% and 4.26% respectively, than those fed the control diet (p = 0.030). The breast muscle yield of broilers fed with 24 mg/kg octacosanol diet increased significantly by 12.15% compared with those fed the control diet (p = 0.047). Eviscerated and breast muscle yield increased linearly with the increase in dietary octacosanol supplementation (p = 0.013 and 0.021, respectively). Broilers fed with 24 or 36 mg/kg octacosanol diet had a greater (p = 0.021) pH_45min value in the breast muscle, which was maintained linearly in response to dietary octacosanol supplementation (p = 0.003). There was a significant decrease (p = 0.007) in drip loss value between the octacosanol-added and the control groups. The drip loss showed linear (p = 0.004) and quadratic (p = 0.041) responses with dietary supplementation of octacosanol. These studies indicate that octacosanol is a potentially effective and safe feed additive which may improve feed efficiency and meat quality, and increase eviscerated and breast muscle yield, in broiler chicks. Dietary supplementation of octacosanol at 24 mg/kg diet is regarded as the recommended dosage in the broilers’ diet.

Keywords: Octacosanol; Growth Performance; Carcass Characteristics; Meat Quality; Broiler Chick

INTRODUCTION

Octacosanol (HO-CH₂-[CH₂]₂₆CH₃), a long-chain aliphatic alcohol, is the main component of a natural wax product that exists in wheat germ oil, rice bran oil, fruits or leaves (Taylor et al., 2003; de Oliveira et al., 2012). Octacosanol has been reported to exhibit a variety of important biological activities in humans and rodents, including antifatigue properties (Kim et al., 2004), antioxidant activities (Ohta et al., 2008), cholesterol-lowering effects (Hernandez et al., 1992), cytoprotective function (Carbajal et al., 1996) and ergogenic properties (Oliaro-Bosso et al., 2009). Studies have shown that the addition of dietary octacosanol has a beneficial effect on metabolic responses to submaximal cycle ergometry, grip and chest strength, and reaction time in human subjects (Saint-John and McNaughton, 1986), and has enhanced the running performance and related biochemical parameters in exercise-trained rats (Kim et al., 2004). Other studies on the effects of octacosanol on lipid metabolism have revealed that the addition of octacosanol leads to a significant decrease in the weight of perirenal adipose tissue of high-fat diet rats (Taylor et al., 2003) and reduces low-density lipoprotein (LDL), triacylglycerol and cholesterol content in the plasma of mice, healthy volunteers or patients (Aneiros et al., 1995; Menendez et al., 2000; Xu et al., 2007). Decreased cholesterol synthesis or enhanced LDL catabolism may be the mechanism of action here (Gouni-Berthold and Berthold, 2002). In terms of antioxidant function, octacosanol protects against CCl₄-induced liver injury in rats by attenuating disrupted hepatic reactive oxygen species metabolism (Ohta et al., 2008), and inhibits in vitro copper ion-induced rat lipoprotein peroxidation (Menendez et al., 1999). In addition, cytoprotection and anti-inflammatory properties have also been confirmed (Carbajal et al., 1996; de Oliveira et al., 2012). Mixtures of long-chain aliphatic alcohols (e.g. policosanol, of which octacosanol is the main component) have been shown to exert similar effects (Arruzazabala et al., 1994; Singh et al., 2006). These studies on the physiological function of octacosanol or policosanol were mainly conducted on rodents or human volunteers.

In view of its prominent physiological functions and high level of safety, with LD₅₀>18,000 mg/kg (Pons et al., 1993), octacosanol has been widely applied to health food, functional beverage, medicine and other fields. Due to its versatile functions, octacosanol may be developed as a potential feed additive for domestic animals. In our previous study, we found that octacosanol increased the growth performance of weaning piglets (Long et al., 2015), which indicated that the addition of octacosanol was effective in animal production. The objective of this study was, therefore, to test the efficacy of dietary octacosanol supplementation on growth performance, carcass characteristics and meat quality in broiler chicks, offering the poultry industry a new direction.

MATERIALS AND METHODS

Birds and management

The animal protocol for the present study was approved by the Animal Care and Use Committee of Feed Research Institute of the Chinese Academy of Agricultural Sciences. A total of 392 1-d-old male Arbor Acres broiler chicks with similar body weight (BW) was obtained from the Beijing Huadu Broiler Company (Beijing, China). All chicks were housed in a standardized chicken house with double-floor cages containing a tube feeder, a nipple drinker line and built-up soft-wood shavings, and exposed to a 23 h of light for the first two weeks and 20 h of light thereafter. The initial temperature in the chicken house was 34°C for the first week and was reduced by 2°C each consecutive week until the temperature reached 24°C. Relative humidity was set at 50% throughout the trial. Diets, in pellet form, and fresh water were supplied ad libitum, and ventilation was controlled. All management of broilers was in accordance with the recommendations of the Arbor Acres Broiler Management Handbook (Aviagen Inc., 2014).

Experimental design and the diets

The broilers were randomly divided into four groups with seven replicates of 14 birds each. Broilers were fed with a basal diet (Table 1) supplemented with 0, 12, 24, or 36 mg octacosanol/kg diet. Octacosanol (purity>92%), extracted from rice bran, was provided by the Huzhou Shuanglin Shengtao Vegetable Oil Factory (Zhejiang, China). Basal diets, divided into two phases according to the ages of the chicks (starter phase, 1 to 21 d; grower phase, 22 to 42 d), were formulated according to the NRC (1994) and the Chinese Feeding Standard of Chicken (Ministry of Agriculture of China, 2004).

Growth performance

The data relating to the BW and feed intake of the chicks during the starter phase (d 1 to 21) and the grower phase (d 22 to 42) were recorded. The average daily gain (ADG), average daily feed intake (ADFI) and feed conversion ratio (FCR, the ratio of feed to gain) were calculated for each period and cumulatively. These parameters were corrected according to mortality.

Carcass characteristics

On the last day of the experiment, two chicks were selected from each replicate and killed after a 12 h fasting for slaughter mensuration. The sacrificed chicks were exsanguinated and deplumed immediately. Next, the eviscerated weight and the internal organ weight of the heart, liver and spleen were measured. Breast muscles (including pectoralis major and minor), leg muscles (including thigh and drumstick muscles) and abdominal fat (including leaf fat surrounding the cloaca and abdominal fat surrounding the gizzard) were removed and weighed. Eviscerated yield, breast muscle yield, leg muscle yield, abdominal fat percentage and relative internal organ weight were all calculated as percentages of BW. The average value of the two broilers was regarded as the replicate value.

Meat quality

The qualities of the breast muscle were evaluated. The meat colour at three points of a meat piece was measured with a spectrocolorimeter (Minolta-CR200, Tokyo, Japan) at 45 min after slaughter. The meat quality was evaluated according to the Commission Internationale de L’Eclairage (CIE) L*a*b* coordinates (where L* indicates relative lightness, a* indicates relative redness, and b* indicates relative yellowness). At the same time, the pH values at a depth of 2.5 cm below the surface for each sample were measured at 45 min, as initial pH, and at 24 h, as ultimate pH, after slaughter using a pH meter (Star A, Thermo Fisher Scientific, Waltham, MA, USA). Next, drip loss was measured using approximately 2 g of breast muscle sample according to the method described by Honikel (1998).

Statistical analysis

All data were performed using SPSS 17.0 for Windows software and expressed as mean values with pooled standard errors of the means using one-way analysis of variance. The difference between group means was separated by the least significant difference (Duncan’s) multiple range test. The dose-response effect of supplemental octacosanol was computed using orthogonal polynomial contrast for linear and quadratic effects. Differences were considered statistically significant at p<0.05 unless otherwise stated.

RESULTS

Growth performance

The results of growth performance of broilers are presented in Table 2. No significant differences in growth performance were observed between the octacosanol-added and control groups during the starter phase (d 1 to 21, p>0.05). In the grower phase (d 22 to 42), dietary supplementation of octacosanol improved BW and FCR compared with the control group, and BW increased linearly (p = 0.031) with dietary supplementation of octacosanol, while FCR decreased linearly (p = 0.016). During the overall phase (d 1 to 42), chicks fed with 24 mg/kg octacosanol diet showed comparably lower FCR, which decreased by 5.17%, compared with those fed the control diet (p = 0.042). Average daily gain and FCR both showed linear effects in response to dietary addition of octacosanol during the overall phase (p = 0.031 and 0.018, respectively). No significant difference was observed in ADFI among all groups (p>0.05).

Carcass characteristics

The effect of dietary supplementation of octacosanol on the carcass characteristics of broilers is presented in Table 3. Broilers fed with dietary supplemental 24 or 36 mg/kg octacosanol showed higher eviscerated yield, which increased by 5.88% and 4.26% respectively, than those fed the control diet (p = 0.030). Compared with the control group, breast muscle yield of the broilers was significantly increased by 12.15% when the broilers were fed with 24 mg/kg octacosanol diet (p = 0.047). There was a linear increase in eviscerated (p = 0.013) and breast muscle yield (p = 0.021) with the dietary addition of octacosanol. No differences were observed in leg muscle yield and abdominal fat percentage among different groups (p>0.05). However, the abdominal fat content decreased linearly in response to dietary octacosanol supplementation (linear effect, p = 0.048). No significant differences were found in the heart, liver or spleen weight among all groups (p>0.05).

Meat quality

Broilers fed with the 24 or 36 mg/kg octacosanol diets had a higher pH_45min value (p = 0.021) in the breast muscle, which remained higher linearly—in response to the dietary addition of octacosanol (p = 0.003)—than those fed the control diet (Table 4). No differences were observed in pH_24h value among all treatments (p>0.05) or in L*, a*, or b* value among all treatments (p>0.05). However, the a* value increased linearly in response to dietary octacosanol supplementation (linear effect, p = 0.051). In addition, a significant difference (p = 0.007) in drip loss was observed between the octacosanol-added groups and the control group. Compared with the control diet, the chicken drip loss decreased by 2.97%, 5.03%, and 3.89%, which showed linear (p = 0.004) and quadratic (p = 0.041) effects with dietary supplementation of octacosanol.

DISCUSSION

Octacosanol or policosanol is considered to be a safe agent (Arruzazabala et al., 1994). As it is an additive, the effect on the growth performance of animals is the most valuable index. This study revealed that the dietary addition of octacosanol improved the growth performance of broiler chicks and that the dietary addition of octacosanol at 24 mg/kg diet showed the best feed efficiency during the overall period. Xu and Shen (1997) obtained the same results by supplementing the diet of broiler chicks with 25 mg/kg octacosanol for 42 days. In addition, the study by Xu et al. (2007) reported that a 1% octacosanol (wt/wt) diet group of E-KO mice gained weight at a rate comparable with the control group, while the study by Xiang et al. (2012) revealed that moderate doses of octacosanol in rats effectively increase the ADFI and ADG, and improve feed efficiency. These results support the hypothesis that octacosanol may improve the growth performance of domestic animals.

Other studies have shown that dietary octacosanol supplementation effectively promotes the secretion of growth hormone (GH) in the blood of rats (Yang, 2012), which can promote protein deposition and bone growth by regulating metabolic processes and energy metabolism in the body (Brown-Borg and Bartke, 2012). Moreover, octacosanol is effective in modulating lipid metabolism, in enhancing glycogen storage, and in decreasing the rate of glycogen utilization in muscle (Kato et al., 1995; Kim et al., 2004), which is due in part to increased energy metabolism through the activation of adenosine monophosphate-activated protein kinase (AMPK) in the muscle (Oliaro-Bosso et al., 2009). These findings indicate that octacosanol may potentially be used as an ergogenic agent. Accordingly, one possible reason for the improvement in the broilers’ growth performance with octacosanol is the resulting increase in GH levels in the chicks along with an enhanced rate of glycogen utilization for growth (Kim et al., 2004). Further research is needed to clarify the effect of octacosanol on GH in broilers’ blood and the efficacy of octacosanol as an ergogenic compound.

To our knowledge, the effects of dietary supplementation of octacosanol on carcass characteristics have not yet been reported. In our current study, octacosanol improved the eviscerated yield and breast muscle yield of broilers. Moreover, it led to a decrease in abdominal fat content. Octacosanol was also shown to be effective in improving the carcass characteristics of broilers.

In fast-growing broilers, growth occurs primarily in the pectorals and feathers during the late stages of development (Scheele, 1997). The relative increase in growth in octacosanol-fed chicks in the grower phase may partly contribute to the comparable increase in breast muscle. Published studies have reported that octacosanol may stimulate the mRNA expression of glycogen synthase in muscle (Yang, 2012), which is effective in regulating glycogen supply and in maintaining the energy balance in muscle. The major metabolic consequences of adaptation to physical functions are a slower rate of muscle glycogen utilization and a greater reliance on fat oxidation in the muscle (Crowley et al., 1996). Thus, in our study, more energy and nutrients were directed towards growth, e.g. breast development, when octacosanol was added to the diet, which improved the feed utilization by broilers during the grower stage. In contrast, no effects on leg muscle yield were observed with dietary supplementation of octacosanol. This result may be explained by the different compositions of muscle fibre types, the rate of protein turnover (Baillie and Garlick, 1991) and the differences in chemical composition (Douris et al., 2006; Lavery et al., 2008) between the breast and leg muscles of animals. In addition, it has been reported that muscle growth factors are more effective in breast muscles than in leg muscles (Qiao et al., 2013). This effect of octacosanol on muscle tissues in broilers is worthy of follow-up investigation.

In the present study, the abdominal fat percentage decreased in response to the increase in octacosanol. Kato et al. (1995) also showed that dietary octacosanol supplementation significantly reduced the weight of perirenal adipose tissue in high-fat diet rats. Moreover, other studies have reported that the development of adipose tissue depends on the availability of serum lipids, which are principal substrates in lipid metabolism (Zhang et al., 2011; Liao et al., 2015). Accordingly, the decrease in abdominal fat content evoked by octacosanol supplementation may be associated with the effect of serum lipid metabolism and the inhibition of cholesterol synthesis (Shimura et al., 1987; Hernandez et al., 1992; Arruzazabala et al., 1994; Castano et al., 2000). Additional experiments are needed to confirm the effect of octacosanol on lipid metabolism.

Research into the influence of octacosanol on muscle qualities, such as fibre size, density, and transformation, remains limited. In this study, we investigated the effect of octacosanol on the meat quality of animals. It is demonstrated that the addition of octacosanol influences pH_45min, a* values and drip loss. Glycolysis—anaerobic metabolism initiated in post-mortem breast muscle—can produce lactic acid and lead to a reduction in meat pH (Cai et al., 2015), which will influence the colour and water-holding capacity of chicken. In addition, meat colour, which mainly depends on the content of the muscle myoglobin, is a comprehensive index reflecting muscle physiology and biochemical and microbiological changes. Drip loss is a sensitive index of muscle protein structure and charge change, which directly influence the flavour, tenderness, processing and storage of the muscle. An improvement in pH_45min, a* values and drip loss results in improved quality. The mechanisms for the improvement in meat quality concomitant with dietary octacosanol supplementation remain unclear, but it has been presumed that the effect may be attributed to the antioxidant properties of octacosanol.

Some studies have suggested that preventing lipid peroxidation in intramuscular fat—which is rich in unsaturated fatty acids and easily oxidized, and has phospholipids as its main component—is beneficial to maintaining the quality and flavour of meat (McCormick, 1999; Chikunya et al., 2004; Kamboh and Zhu, 2013). Studies have confirmed that octacosanol can inhibit both liver and blood lipid oxidation (Ohta et al., 2008; Long et al., 2015) and protect lipoprotein particles against lipid peroxidation in animals (Menendez et al., 1999; Yu, 2003). Therefore, one reason for the improvement in meat quality produced by octacosanol may be the antioxidant effect. The exact mechanism, however, needs further elucidation.

CONCLUSION

In summary, the results of the present study indicate that octacosanol is an effective and safe feed additive as it can improve feed efficiency, stimulate eviscerated yield and breast muscle yield, and contribute to good meat quality. In this study, dietary supplementation of octacosanol at 24 mg/kg was regarded as the recommended dosage in the diet of broilers.

Notes

CONFLICT OF INTEREST

We certify that there is no conflict of interest with any financial organization regarding the material discussed in the manuscript.

ACKNOWLEDGMENTS

The financial support provided by the China Agriculture Research System-Beijing Team for Poultry Industry and the Agricultural Science and Technology Innovation Program (ASTIP) is gratefully appreciated.

Table 1

Dietary composition and nutrient levels of the basal diets (as-fed basis)

	Starter phase (d 1 to 21)	Grower phase (d 22 to 42)
Ingredient (%)
Corn	60.80	63.90
Soybean meal	32.90	28.95
Soybean oil	2.00	3.00
Dicalcium phosphate	1.62	1.50
Limestone	1.55	1.60
Salt	0.36	0.36
DL-methionine	0.23	0.16
L-lysine·HCl	0.25	0.24
Vitamin-mineral premix1	0.29	0.29
Total	100.00	100.00
Nutrient level2
AME (MJ/kg)	12.12	12.50
CP (%)	20.30 (20.85)	18.56 (18.02)
Ca (%)	0.96 (1.02)	0.94 (0.86)
Total P (%)	0.64 (0.68)	0.60 (0.62)
Available P (%)	0.41	0.39
Lysine (%)	1.10	1.00
Methionine (%)	0.52	0.41
Methionine+cysteine (%)	0.83	0.72

AME, apparent metabolizable energy; CP, crude protein.

¹ Supplied per kg diet: vitamin A, 12,500 IU; vitamin D₃, 2,500 IU; vitamin E, 15 IU; vitamin K₃, 2.5 mg; vitamin B₁, 3.2 mg; vitamin B₂, 6.5 mg; vitamin B₁₂, 0.025 mg; nicotinic acid, 30 mg; calcium pantothenate, 12 mg; biotin, 0.03 mg; folic acid, 1.0 mg; iron, 80 mg; copper, 8 mg; manganese, 100 mg; zinc, 75 mg; iodine, 0.35 mg; and selenium, 0.15 mg.

² The value in parentheses indicates the analyzed value. Others are calculated values.

Table 2

Effect of dietary octacosanol supplementation on growth performance of broilers1

Items	Dietary octacosanol addition (mg/kg)				Pooled SEM	p-value

	0	12	24	36		ANOVA2	Linear3	Quadratic3
Starter phase (d 1 to 21)
BW d 21 (g)	729	725	740	731	3.22	0.450	0.458	0.719
ADG (g)	32.62	32.44	33.14	32.74	0.15	0.445	0.453	0.716
ADFI (g)	48.83	48.07	48.39	49.28	0.52	0.874	0.742	0.458
FCR (feed:gain, g:g)	1.496	1.483	1.460	1.506	0.02	0.815	0.964	0.414
Grower phase (d 22 to 42)
BW d 42 (g)	2,272	2,310	2,351	2,339	12.52	0.114	0.031	0.302
ADG (g)	73.50	75.47	76.71	76.55	0.61	0.222	0.060	0.374
ADFI (g)	144.95	145.67	142.29	144.04	0.69	0.349	0.325	0.709
FCR (feed:gain, g:g)	1.973	1.935	1.857	1.877	0.02	0.061	0.016	0.370
Whole phase (d 1 to 42)
ADG (g)	53.07	53.96	54.94	54.64	0.30	0.111	0.031	0.298
ADFI (g)	96.90	96.86	95.34	96.41	0.39	0.486	0.409	0.488
FCR (feed:gain, g:g)	1.829b	1.796ab	1.737a	1.764ab	0.01	0.042	0.018	0.188

SEM, standard error of the mean; ANOVA, analysis of variance; BW, body weight; ADG, average daily gain; ADFI, average daily feed intake; FCR, feed conversion ratio.

¹ n = 7 per treatment, with 14 broilers per replicate.

² One-way ANOVA of all treatment groups.

³ Linear and quadratic effects of increasing inclusion levels of octacosanol.

^a,b Values within a row with different superscript letters are significantly different (p<0.05).

Table 3

Effect of dietary octacosanol supplementation on carcass characteristics of broilers at d 421

Items2	Dietary octacosanol addition (mg/kg feed)				Pooled SEM	p-value

	0	12	24	36		ANOVA3	Linear4	Quadratic4
Eviscerated yield (%)	70.70b	72.55ab	74.86a	73.71a	0.54	0.030	0.013	0.126
Breast muscle yield (%)	18.03b	19.11ab	20.22a	19.62ab	0.29	0.047	0.021	0.126
Leg muscle yield (%)	15.98	16.54	16.86	16.34	0.24	0.662	0.543	0.293
Abdominal fat (%)	1.77	1.73	1.70	1.70	0.01	0.201	0.048	0.437
Heart weight (g/kg BW)	4.92	4.66	4.51	4.99	0.08	0.098	0.929	0.081
Liver weight (g/kg BW)	16.19	16.56	16.37	16.82	0.19	0.702	0.340	0.911
Spleen weight (g/kg BW)	1.05	1.06	1.04	1.09	0.01	0.562	0.445	0.557

SEM, standard error of the mean; ANOVA, analysis of variance; BW, body weight.

¹ n=7 per treatment, with 2 birds per replicate.

² All the indicators were calculated as percentage of BW.

³ One-way ANOVA of all treatment groups.

⁴ Linear and quadratic effects of increasing inclusion levels of octacosanol.

^a,b Values within a row with different superscript letters are significantly different (p<0.05).

Table 4

Effect of dietary octacosanol supplementation on meat quality of broilers at d 421

Items	Dietary octacosanol addition (mg/kg feed)				Pooled SEM	p-value

	0	12	24	36		ANOVA2	Linear3	Quadratic3
pH_45min4	6.04b	6.13ab	6.15a	6.20a	0.02	0.021	0.003	0.560
pH_24h4	5.72	5.72	5.70	5.79	0.02	0.345	0.261	0.243
Lightness (L*)	57.29	57.34	57.18	57.69	0.11	0.434	0.312	0.318
Redness (a*)	13.78	14.34	14.76	14.42	0.14	0.083	0.051	0.095
Yellowness (b*)	14.70	14.51	14.43	15.00	0.18	0.698	0.623	0.308
Drip loss5 (%)	4.37B	4.24A	4.15A	4.20A	0.02	0.007	0.004	0.041

SEM, standard error of the mean; ANOVA, analysis of variance.

¹ n = 7 per treatment, with 2 birds per replicate.

² One-way ANOVA of all treatment groups.

³ Linear and quadratic effects of increasing inclusion levels of octacosanol.

⁴ pH_45min, 45 min postmortem; pH_24h, 24 h postmortem.

⁵ Measured when hung at 48 h.

^a,b Values within a row with different superscript letters are significantly different (p<0.05).

^A,B Values within a row with different superscript letters differ significantly (p<0.01).

REFERENCES

Aneiros E, Mas R, Calderon B, Illnait J, Fernandez L, Castano G, Fernandez JC. 1995. Effects of policosanol in lowering cholesterol levels in patients with type II hypercholesterolemia. Curr Ther Res 56:176–182.

Arruzazabala ML, Carbajal D, Mas R, Molina V, Valdes S, Laguna A. 1994. Cholesterol-lowering effects of policosanol in rabbits. Biol Res 27:205–208.

Aviagen Inc. 2014. Arbor Acres Broiler Management Handbook. Aviagen Inc; Huntsville, AL, USA:

Baillie AG, Garlick PJ. 1991. Responses of protein synthesis in different skeletal muscles to fasting and insulin in rats. Am J Physiol 260:E891–E896.

Brown-Borg HM, Bartke A. 2012. GH and IGF1: roles in energy metabolism of long-living GH mutant mice. J Gerontol A Biol Sci Med Sci 67A:652–660.

Cai L, Park YS, Seong SI, Yoo SW, Kim IH. 2015. Effects of rare earth elements-enriched yeast on growth performance, nutrient digestibility, meat quality, relative organ weight, and excreta microflora in broiler chickens. Livest Sci 172:43–49.

Carbajal D, Molina V, Valdes S, Arruzazabala L, Rodeiro I, Mas R, Magraner J. 1996. Possible cytoprotective mechanism in rats of D-002, an anti-ulcerogenic product isolated from beeswax. J Pharm Pharmacol 48:858–860.

Castano G, Mas R, Feranadez L, Fernandez JC, Illnait J, Lopez LE, Alvarez E. 2000. Effects of policosanol on postmenopausal women with type II hypercholesterolemia. Gynecol Endocrinol 14:187–195.

Chikunya S, Demirel G, Enser M, Wood JD, Wilkinson RG, Sinclair LA. 2004. Biohydrogenation of dietary n-3 PUFA and stability of ingested vitamin E in the rumen, and their effects on microbial activity in sheep. Br J Nutr 91:539–550.

Crowley MA, Willis WT, Matt KS, Donovan CM. 1996. A reduced lactate mass explains much of the glycogen sparing associated with training. J Appl Physiol 81:362–367.

de Oliveira AM, Conserva LM, de Souza Ferro JN, de Almeida Brito F, Lyra Lemos RP, Barreto E. 2012. Antinociceptive and anti-inflammatory effects of octacosanol from the leaves of Sabicea grisea var. grisea in mice. Int J Mol Sci 13:1598–1611.

Douris PC, White BP, Cullen RR, Keltz WE, Meli J, Mondiello DM, Wenger D. 2006. The relationship between maximal repetition performance and muscle fiber type as estimated by noninvasive technique in the quadriceps of untrained women. J Strength Cond Res 20:699–703.

Gouni-Berthold I, Berthold HK. 2002. Policosanol: Clinical pharmacology and therapeutic significance of a new lipid-lowering agent. Am Heart J 143:356–365.

Hernandez F, Illait J, Mas R, Castano G, Fernandez L, Gonzalez M, Cordovi N, Fernandez JC. 1992. Effects of policosanol on serum lipids and lipoproteins in healthy volunteers. Curr Ther Res 51:568–575.

Honikel KO. 1998. Reference methods for the assessment of physical characteristics of meat. Meat Sci 49:447–457.

Kamboh AA, Zhu WY. 2013. Effect of increasing levels of bioflavonoids in broiler feed on plasma anti-oxidative potential, lipid metabolites, and fatty acid composition of meat. Poult Sci 92:454–461.

Kato S, Karino KI, Hasegawa S, Nagasawa J, Nagasaki A, Eguchi M, Ichinose T, Tago K, Okumori H, Hamatani K, Takahashi M, Ogasawara J, Masushige S, Masushige S. 1995. Octacosanol affects lipid metabolism in rats fed on a high-fat diet. Br J Nutr 73:433–441.

Kim H, Park S, Han DS, Park T. 2004. Octacosanol supplementation increases running endurance time and improves biochemical parameters after exhaustion in trained rats. J Med Food 6:345–351.

Lavery GG, Walker EA, Turan N, Rogoff D, Ryder JW, Shelton JM, Richardson JA, Falciani F, White PC, Stewart PM, Parkers KL, McMillan DR. 2008. Deletion of hexose-6-phosphate dehydrogenase activates the unfolded protein response pathway and induces skeletal myopathy. J Biol Chem 283:8453–8461.

Liao XD, Wu RJ, Ma G, Zhao LM, Zheng ZJ, Zhang RJ. 2015. Effects of Clostridium butyricum on antioxidant properties, meat quality and fatty acid composition of broiler birds. Lipids Health Dis 14:36.

Long L, Gao MZ, Peng K, Sun J, Wang SX. 2015. Effects of octacosanol extracted from rice bran on production performance and blood parameters in weanling piglets. J Chinese Cereals Oils Assoc 30:94–100.

McCormick RJ. 1999. Extracellular modification to muscle collagen: Implication for meat quality. Poult Sci 78:785–791.

Menendez R, Fraga V, Amor AM, Gonzalez RM, Mas R. 1999. Oral administration of policosanol inhibits in vitro copper ion-induced rat lipoprotein peroxidation. Physiol Behav 67:1–7.

Menendez R, Mas R, Amor AM, Gonzalez RM, Fernandez JC, Rodeiro I, Zayas M, Jimenez S. 2000. Effects of policosanol treatment on the susceptibility of low density lipoprotein (LDL) isolated from healthy volunteers to oxidative modification in vitro. Br J Clin Pharmacol 50:255–262.

MAC (Ministry of Agriculture of China). 2004. Feeding Standard of Chicken. NY/T 33-2004. Standards Press of China; Beijing, China:

NRC (National Research Council). 1994. Nutrient Requirements of Poultry. 9th rev ednAcademy Press National; Washington, DC, USA:

Ohta Y, Ohashi K, Matsura T, Tokunaga K, Kitagawa A, Yamada K. 2008. Octacosanol attenuates disrupted hepatic reactive oxygen species metabolism associated with acute liver injury progression in rats intoxicated with carbon tetrachloride. J Clin Biochem Nutr 42:118–125.

Oliaro-Bosso S, Gaudino EC, Mantegna S, Giraudo E, Meda C, Viola F, Cravotto G. 2009. Regulation of HMGCoA reductase activity by policosanol and octacosadienol, a new synthetic analogue of octacosanol. Lipids 44:907–916.

Pons P, Jimenez A, Rodrigues M, Illnait J, Mas R, Fernandez L, Fernandez JC. 1993. Effects of policosanol in elderly hypercholesterolemic patients. Curr Ther Res 53:265–269.

Qiao X, Zhang HJ, Wu SG, Yue HY, Zuo JJ, Feng DY, Qi GH. 2013. Effects of β-hydroxy-β-methylbutyrate calcium on growth, blood parameters and carcass qualities of broiler chickens. Poult Sci 92:753–759.

Saint-John M, McNaughton L. 1986. Octacosanol ingestion and its effects on metabolic responses to submaximal cycle ergometry, reaction time and chest and grip strength. Int Clin Nutr Rev 6:81–87.

Scheele CW. 1997. Pathological changes in metabolism of poultry related to increasing production levels. Vet Q 19:127–130.

Shimura S, Hasegawa T, Takano S, Suzuki T. 1987. Studies on the effect of octacosanol on motor endurance in mice. Nutr Rep Int 36:1029–1038.

Singh DK, Li L, Porter TD. 2006. Policosanol inhibits cholesterol synthesis in hepatoma cells by activation of AMP-kinase. J Pharmacol Exp Ther 318:1020–1026.

Taylor JC, Rapport L, Lockwood GB. 2003. Octacosanol in human health. Nutrition 19:192–195.

Xiang Y, Yang H, Wu X, Liu JP. 2012. Research and application progress of energy metabolism of body controlled by octacosanol. J Xinxiang Univ 29:44–46.

Xu RP, Shen H. 1997. Application of octacosanol in broilers diet. Feed Res 5:26. (in Chinese)

Xu ZY, Fitz E, Riediger N, Moghadasian MH. 2007. Dietary octacosanol reduces plasma triacylglycerol levels but not atherogenesis in apolipoprotein E-knockout mice. Nutr Res 27:212–217.

Yang H. 2012. The Preparation of Octacosanol and the Mechanism of the Impact on Energy Metabolism. M Sc Thesis. Changsha University of Science and Technology; Changsha, China:

Yu CQ. 2003. Study on damage of myocardial mitochondria in rats after exhaustive exercise. China Food Additives 2:35–37. (in Chinese)

Zhang WH, Gao F, Zhu QF, Li C, Jiang Y, Dai SF, Zhou GH. 2011. Dietary sodium butyrate alleviates the oxidative stress induced by corticosterone exposure and improves meat quality in broiler chickens. Poult Sci 90:2592–2599.