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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.
FUNDING
This study was provided by the National Key Research and Development Program of China (grant number 2022YFD 1300100), Chinese Agricultural Research System (grant number CARS-40), Genetic Resources Preservation of High Producing Purebred Layer Lines (grant number 19221274), Beijing Featured Livestock and Poultry Genetic Resources Preservation Project (grant number 202203310002), and the Agricultural Science and Technology Innovation Program (grant number ASTIP-IAS04).
Items | From 19 wk of age to 5% egg-laying rate | From 5% egg-laying rate to 50 wk of age |
---|---|---|
Ingredients (%) | ||
Corn | 65.5 | 64.0 |
Soybean meal | 21.5 | 23.2 |
Wheat bran | 5.0 | 3.8 |
Limestone | 4 | 5 |
Premix1) | 4 | 4 |
Formulated nutrient profile2) | ||
ME (MJ/kg) | 11.20 | 11.08 |
Crude protein (%) | 15.07 | 15.51 |
Ca (%) | 2.03 | 2.75 |
Total phosphorus (%) | 0.51 | 0.51 |
Available phosphorus (%) | 0.29 | 0.29 |
Lys (%) | 0.75 | 0.78 |
Met (%) | 0.34 | 0.39 |
Met+Cys (%) | 0.65 | 0.73 |
1) Premix provided per kilogram of diet: vitamin A, 100 to 250 KIU; vitamin D3, 60 to 80 KIU; vitamin E, 0.5 KIU; vitamin K3, 80 mg; vitamin B1, 45 mg; vitamin B2, 180 mg; vitamin B6, 100 mg; vitamin B12, 0.5 mg; D-Calcium pantothenate, 220 mg; nicotinamide, 720 mg; folic acid, 20 mg; biotin, 2 mg; Copper, 0.2 to 0.8 g; ferrous iron, 1.5 to 5.0 g; zinc, 0.8 to 2.4 g; manganese, 1.5 to 3.0 g; iodine, 10 to 30 mg; selenium, 2 to 6 mg.
Variables2) | Breeds1) | SEM | p-value | |||||
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WL | RIR | CR | BR | DY | BYC | |||
Age at first egg (d) | 144.26f | 149.29d | 147.50e | 150.32c | 154.61b | 170.98a | 0.20 | <0.01 |
Egg number (n) | 180.81a | 175.52b | 169.53c | 165.43d | 137.28e | 116.48f | 0.46 | <0.01 |
Average clutch length until 32 wk (d) | 13.36a | 10.43b | 8.33c | 8.20c | 5.35d | 4.22e | 0.11 | <0.01 |
Average clutch length (d) | 12.83a | 13.20a | 8.65b | 8.00c | 3.84d | 3.31d | 0.11 | <0.01 |
Maximum clutch length until 32 wk (d) | 35.10a | 28.85b | 23.19c | 22.15c | 13.88d | 5.35e | 0.25 | <0.01 |
Maximum clutch length (d) | 48.13a | 49.36a | 33.29b | 30.07c | 14.48d | 11.11e | 0.41 | <0.01 |
Number of clutches (n) | 18.12d | 17.80d | 24.67c | 25.06c | 38.75a | 37.57b | 0.20 | <0.01 |
Average pause length (d) | 1.46c | 1.51bc | 1.43c | 1.43c | 1.58b | 1.82a | 0.04 | <0.01 |
Number of pauses (n) | 17.07d | 16.67d | 23.78c | 24.10c | 38.19a | 36.84b | 0.20 | <0.01 |
FCL (≤7 d, %) | 55.68e | 56.60e | 64.45d | 67.22c | 91.05b | 94.60a | 0.35 | <0.01 |
FCL (8 to 14 d, %) | 19.45a | 17.88b | 17.53b | 19.74a | 6.64c | 4.31d | 0.19 | <0.01 |
FCL (≥15 d, %) | 24.87a | 25.52a | 13.94b | 13.04b | 2.31c | 1.44c | 0.26 | <0.01 |
1) WL, White Leghorn chickens (n = 629); RIR, Rhode Island Red chickens (n = 704); CR, Columbian Plymouth Rock chickens (n = 730); BR, Barred Plymouth Rock chickens (n = 688); DY, synthetic dwarf line (n = 675); BYC, Beijing-You chickens (n = 589).
Variables2) | Breeds1) | |||||
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WL | RIR | CR | BR | DY | BYC | |
Egg number (n) | 9.10 | 9.97 | 10.82 | 9.92 | 15.84 | 16.85 |
Average clutch length until 32 wk (d) | 78.25 | 65.44 | 68.81 | 64.88 | 70.40 | 56.83 |
Average clutch length (d) | 57.66 | 66.49 | 64.22 | 55.35 | 41.84 | 36.29 |
Maximum clutch length until 32 wk (d) | 53.52 | 50.00 | 68.81 | 64.88 | 70.40 | 72.47 |
Maximum clutch length (d) | 58.09 | 58.78 | 65.46 | 65.80 | 72.55 | 73.05 |
Variables2) | Breeds1) | |||||
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WL | RIR | CR | BR | DY | BYC | |
Average clutch length until 32 wk (d) | 0.35** | 0.31** | 0.52** | 0.50** | 0.48** | 0.39** |
Average clutch length (d) | 0.59** | 0.51** | 0.59** | 0.60** | 0.66** | 0.54** |
Maximum clutch length until 32 wk (d) | 0.52** | 0.42** | 0.46** | 0.45** | 0.42** | 0.43** |
Maximum clutch length (d) | 0.54** | 0.48** | 0.54** | 0.54** | 0.49** | 0.41** |
Number of clutches (n) | −0.61** | −0.56** | −0.65** | −0.60** | −0.35** | −0.04 |
Average pause length (d) | −0.40** | −0.49** | −0.42** | −0.46** | −0.63** | −0.64** |
Number of pauses (n) | −0.61** | −0.56** | −0.65** | −0.60** | −0.35** | −0.04 |
FCL (≤7 d, %) | −0.58** | −0.54** | −0.69** | −0.63** | −0.57** | −0.36** |
FCL (8 to 14 d, %) | 0.02 | 0.01 | 0.31** | 0.31** | 0.51** | 0.32** |
FCL (≥15 d, %) | 0.59** | 0.53** | 0.59** | 0.56** | 0.46** | −0.04 |
1) WL, White Leghorn chickens (n = 629); RIR, Rhode Island Red chickens (n = 704); CR, Columbian Plymouth Rock chickens (n = 730); BR, Barred Plymouth Rock chickens (n = 688); DY, synthetic dwarf line (n = 675); BYC, Beijing-You chickens (n = 589).
Variables2) | Breeds1) | |||||
---|---|---|---|---|---|---|
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WL | RIR | CR | BR | DY | BYC | |
Egg number (n) | −0.52** | −0.45** | −0.40** | −0.36** | −0.35** | −0.31** |
Average clutch length until 32 wk (d) | −0.20** | −0.16** | −0.11 | −0.12** | −0.15** | −0.09** |
Average clutch length (d) | −0.04 | 0.06 | 0.03** | −0.08* | −0.05 | −0.01 |
Maximum clutch length until 32 wk (d) | −0.06 | 0.05 | 0.05 | 0.03 | 0.01 | −0.02 |
Maximum clutch length (d) | −0.10* | −0.06 | −0.05 | 0.01 | −0.15** | −0.05 |
Number of clutches (n) | −0.01 | −0.10* | −0.08* | −0.11** | −0.12** | −0.21** |
Average pause length (d) | −0.02 | 0.00 | −0.01 | −0.06 | −0.20** | −0.20** |
Number of pauses (n) | 0.01 | −0.10* | −0.08* | −0.11** | −0.12** | −0.21** |
FCL (≤7 d, %) | 0.02 | −0.08* | −0.00 | −0.04 | 0.05 | −0.02 |
FCL (8 to 14 d, %) | 0.04 | 0.00 | −0.03 | 0.00 | −0.05 | 0.03 |
FCL (≥15 d, %) | −0.05 | 0.08* | −0.01 | 0.06 | −0.05 | −0.05 |
1) WL, White Leghorn chickens (n = 629); RIR, Rhode Island Red chickens (n = 704); CR, Columbian Plymouth Rock chickens (n = 730); BR, Barred Plymouth Rock chickens (n = 688); DY, synthetic dwarf line (n = 675); BYC, Beijing-You chickens (n = 589).
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