Studies on Nutrient Concentration in Diets for Laying hens at Different Seasons Ⅱ. Study on Optimization of Diets for Loman Laying hens at High Temperature
Zhou Ming Li Peiying (Animal Science & Agriculture College, Auhui Agricultural University, Hefei 230036) Peng Kesen Ding Changchun (Shushan Poultry Farm, Hefei)
1997, 18(06):
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During the high temperature in summer season(July l,1993  ̄ Sept.30, 1993, Hefei,air temperature of open side poultry house: 27.9 ̄38.7℃, mean: 32.3℃), 6 groups of Loman laying hens (23 ̄36 weeks old ) in same ecological environment were fed with 6 diets of various formulas. The diet I was made according to the feed standard recommended by Loman company. Some proper adjustments for nutrient concentrations were made in diets Ⅱ~Ⅵ. Feeding results showed that there were significant (p<0.05) or great significant (p<0.01) differences between various groups of hens in laying rate, feed conversion efficiency and feed cost. Laying rate (83.93%) and feed conversion efficiency (43.64%) of the fifth group hens were the highest (p<0.01), and increased by 6.36% (p<0.05) and 5.77% (p<0.05), respectively, as compared with the first group (laying rate: 78 91%; feed conversion efficiency: 41.26%). Feed cost of the fifth group (2.55 yuan/kg) decreased by 14.51% (p<0.01), as compared with the first group (2.92 yuan/kg). Formula (%)of the fifth group diet: corn 61.0, wheat bran 3.0, soybean cake 17.0, fish meal 4.0, rapeseed cake 4.3, methionine 0.14, lysine 0.05, bone meal 0.8, lime stone meal 8.5, dicalcium phosphate 0.8, common salt 0.31, trace element premix 0.12, Loman vitamin premix 0.08.