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DOI: https://doi.org/10.5713/ajas.19.0828    [Accepted] Published online February 25, 2020.
Response of broilers to supplementation of branched-chain amino acids blends with different valine contents in the starter period under summer conditions
Canan Kop-bozbay1,*  , Ahmet Akdag2  , Helin Atan1  , Nuh Ocak2 
1Department of Animal Science, Faculty of Agriculture, Eskisehir Osmangazi University, 26480, Eskisehir, Turkey
2Department of Animal Science, Faculty of Agriculture, Ondokuz Mayis University, 55139, Samsun, Turkey
Correspondence:  Canan Kop-bozbay, Tel: +90-5423801390, Fax: +90-2223242990, Email: cbozbay@ogu.edu.tr
Received: 21 October 2019   • Revised: 21 December 2019   • Accepted: 19 February 2020
The objectives of this study were to compare the effects of normal and low protein content (PC) of starter diet supplemented or not with blends of branched-chain amino acids (BCAAs) on growth performance of broilers under summer conditions and to investigate whether these effects altered some quality traits and the characteristics of gastrointestinal tract.
A total of 768 mixed-sex broiler chicks (Ross 308, one-d-old) with an average initial body weight (BW) of 47.6±1.03 g were allocated into six treatments with four replications in 2 × 3 factorial arrangement. Factors were: PC - normal (N, 22% to d 15) and low (L, 20% to d 15) and added BCAA blends - L-leucine, L-isoleucine and L-valine at zero (0L:0I:0V) 1.0, 0.25 and 0.25 (4L:1I:1V) or 1.0, 0.25, 0.75 (4L:1I:3V) g/kg of diet. Hence, six dietary treatments were named as N0L:0I:0V, N4L:1I:1V, N4L:1I:3V, L0L:0I:0V, L4L:1I:1V and L4L:1I:3V. Average indoor temperature and humidity were 32.8±1.7°C and 61.1±4.12%, respectively.
BW, feed conversion ratio (FCR) and carcass weight were not affected by PC, BCCA and their interaction (p>0.05). The L diets decreased the water holding capacity of (p=0.002) of the breast (p=0.002) and thigh (p=0.050) meats and dressing percentage (p=0.005) compared to the N diets. The 4L:1I:1V diet decreased breast yield compared to the 0L:0I:0V diets (p=0.041). The effect of PC on feed intake, mortality and gastrointestinal trait weight were depended on the L:I:V ratios under summer conditions due to interactions between factors (p<0.05). The FI and mortality of L4L:1I:1V broilers were lower than those of N4L:1I:1V birds (p<0.05).
It was concluded that the blends of BCAAs used failed to improve performance and to promote breast yields, because diets with normal or with reduced protein supplemented or not with BCAAs up to d 15 produced a similar BW and FCR in broilers raised in hot-climate conditions.
Keywords: Poultry; Amino Acids; Productive Performance; Carcass Yield; Digestive System; Muscle Growth; Meat Quality
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