Anim Biosci > Volume 36(6); 2023 > Article |
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CONFLICT OF INTEREST
We certify that there is no conflict of interest with any financial organization regarding the material discussed in the manuscript.
AUTHOR CONTRIBUTIONS
LL and FCL designed the experiment; TTW and MZ executed the experiment; MZ wrote the manuscript; BW and CHL collected data; LL and FCL offered financial support and had primary responsibility for the final content.
FUNDING
This work was supported by the earmarked fund for CARS (CARS-43-B-1); Natural Science Foundation of Shandong Province (ZR2021MC043); Special Economic Animal Industry Technology System of Shandong Province (SDAIT-21-16); Agricultural Seed Improvement Project of Shandong Province (2021LZGC002) and Taishan Industry Leadership Project (TSCY20190107).
Item | Treatment1) | ||||
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Control | LP | LP+0.2%Met | LP+0.4%Met | LP+0.6%Met | |
Feed ingredient (%) | |||||
Corn | 15.00 | 17.00 | 17.00 | 17.00 | 17.00 |
Soybean meal | 18.00 | 13.00 | 13.00 | 13.00 | 13.00 |
Wheat bran | 20.00 | 20.00 | 20.00 | 20.00 | 20.00 |
Peanut vine | 30.00 | 33.00 | 33.00 | 33.00 | 33.00 |
Soya bean stem meal | 10.00 | 10.00 | 10.00 | 10.00 | 10.00 |
Artemisia argyi | 5.00 | 5.00 | 5.00 | 5.00 | 5.00 |
Bean oil | 0.80 | 0.80 | 0.70 | 0.50 | 0.30 |
Methionine | - | - | 0.10 | 0.30 | 0.50 |
Premix2) | 1.10 | 1.10 | 1.10 | 1.10 | 1.10 |
Total | 100 | 100 | 100 | 100 | 100 |
Nutrient composition (%) | |||||
DE (MJ/kg)3) | 10.83 | 10.97 | 10.97 | 10.97 | 10.97 |
CP (%) | 17.09 | 15.16 | 15.13 | 15.15 | 15.18 |
EE (%) | 3.53 | 3.08 | 3.29 | 3.22 | 2.98 |
Ash (%) | 9.06 | 8.79 | 8.39 | 8.59 | 8.59 |
CF (%) | 15.10 | 15.22 | 15.85 | 15.74 | 16.13 |
ADF (%) | 18.82 | 21.52 | 20.50 | 19.50 | 20.68 |
NDF (%) | 32.24 | 32.76 | 31.36 | 31.67 | 33.19 |
ADL (%) | 3.20 | 3.67 | 3.59 | 3.00 | 3.34 |
Ca (%) | 0.99 | 1.04 | 1.11 | 0.99 | 1.05 |
P (%) | 0.64 | 0.63 | 0.64 | 0.63 | 0.60 |
Met (%) | 0.33 | 0.31 | 0.42 | 0.62 | 0.81 |
DE, digestible energy; CP, crude protein; EE, ether extract; Ash, Ash content; CF, crude fibre; ADF, aerage daily feed intake; NDF, neutral detergent fiber; ADL, acid detergent lignin; Ca, calcium; P, phosphorus; Met, methionine.
1) Control, normal diet; LP, low protein diet; LP+0.2% Met, LP+0.2% methionine; LP+0.4% Met, LP+0.4% methionine; LP+0.6% Met, LP+0.6% methionine.
2) The premix provided the following per kg of diets: Vit A 8,000 IU, Vit D3 400 IU, Vit E 50 mg, Vit K 30.8 mg, Vit B1 0.36 mg, Vit B2 0.4 mg, Vit B6 0.6 mg, Vit B12 0.006 mg, Nicotinic acid 4 mg, Folate 0.12 mg, Calcium Pantothenate 7 mg, Biotin 0.04 mg, Fe (as ferrous sulfate) 50 mg, Mn (as manganese sulfate) 4 mg, Cu (as copper sulfate) 20 mg, Zn (as zinc sulfate) 50 mg, Choline chloride 1,000 mg, Iimestone 10,000 mg, Nacl 3,000 mg, Lys 2,800 mg.
GAPDH, glyceraldehyde 3-phosphate dehydrogenase; IGF1, insulin-like growth factor 1; Wnt10b, Wingless-type MMTV integration site family, member 10B; HGF, hepatocyte growth factor; EGF, epidermal growth factor; KAP3.1, Keratin Association Protein 3.1; KAP6.1, Keratin Association Protein 6.1; TGFβ1, transforming growth factor β1; TGFβ2, transforming growth factor β2.
Items | Treatments1) | p-value | ||||
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Control | LP | LP+0.2% Met | LP+0.4% Met | LP+0.6% Met | ||
Wool production (n = 5) | ||||||
Wool yield (g) | 294.58±16.69a | 260.21±11.42b | 263.81±8.42b | 319.35±22.73a | 312.11±13.52a | 0.038 |
Total feed intake (kg) | 12.08±0.01b | 12.14±0.02ab | 12.48±0.02a | 12.52±0.01a | 12.21±0.02ab | 0.046 |
FCR | 41.35±1.98ab | 46.95±1.70a | 47.52±1.63a | 39.99±2.78b | 39.43±1.73b | 0.020 |
Wool quality (n = 10) | ||||||
Wool length (cm) | 5.54±0.14 | 5.40±0.16 | 5.37±0.11 | 5.57±0.17 | 5.66±0.16 | 0.579 |
Coarse wool rate (%) | 9.78±3.24a | 2.53±0.64b | 2.21±0.41b | 7.60±1.54ab | 12.40±2.18a | 0.001 |
Wool fineness (μm) | 16.48±0.98a | 14.65±0.23b | 14.82±0.85b | 16.32±0.61a | 18.15±0.68a | 0.008 |
Items | Treatments1) | p-value | ||||
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Control | LP | LP+0.2% Met | LP+0.4% Met | LP+0.6% Met | ||
Total follicle density (n/mm2) | 135.73±9.30 | 127.83±8.04 | 143.63±6.15 | 140.83±6.36 | 132.89±6.72 | 0.578 |
Primary follicle density (n/mm2) | 7.20±0.59ab | 6.00±0.63c | 5.41±0.41c | 6.58±0.37bc | 8.52±0.45a | <0.001 |
Secondary follicle density (n/mm2) | 128.83±9.34 | 121.83±7.97 | 138.22±6.13 | 134.26±6.35 | 124.37±6.59 | 0.500 |
Items | Treatments1) | p-value | ||||
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Control | LP | LP +0.2% Met | LP +0.4% Met | LP+0.6% Met | ||
Intake nitrogen (g/d) | 4.16±0.15a | 3.74±0.13b | 3.66±0.06b | 3.64±0.10b | 3.69±0.07b | 0.011 |
Faecal nitrogen (g/d) | 1.09±0.07a | 0.87±0.03b | 0.84±0.03b | 0.75±0.06b | 0.76±0.06b | <0.001 |
Urinary nitrogen (g/d) | 1.55±0.03a | 1.31±0.04b | 1.27±0.03b | 1.32±0.02b | 1.32±0.02b | <0.001 |
Nitrogen retention (d/g) | 1.53±0.10 | 1.56±0.11 | 1.56±0.06 | 1.58±0.13 | 1.62±0.09 | 0.974 |
Apparent nitrogen digestibility (%) | 73.88±0.97b | 76.60±1.02ab | 77.16±0.95a | 79.30±1.96a | 79.50±1.65a | 0.049 |
Nitrogen utilization rate (%) | 36.47±1.30b | 41.42±1.71ab | 42.40±1.17a | 43.08±2.43a | 43.77±1.84a | 0.049 |
Nitrogen biological value (%) | 49.39±1.78b | 53.99±1.59ab | 54.94±1.23a | 54.11±1.81a | 54.96±1.34a | 0.047 |