Optimum isoleucine requirement of laying hens and the effect of age.

摘要: Abstract 1. Medium weight laying hens were used for an assay to determine their isoleucine requirement between 26 and 36 weeks of age again 46 56 age. 2. Two isoleucine‐limiting mixtures formulated with similar amino acid profiles, one containing 198 g the other 110 crude protein per kg diet. These blended give a series 11 diets contents ranging from 7.6 3.8 g/kg. The lowest diet was also fed supplement L‐isoleucine. Each 12 given 5 groups 24 hens. 3. daily individual estimated be 9.48 mg/g egg output plus 44.47 mg/kg body day 1st period 12.11 6.86 2nd period. Calculated optimum intakes various ratios cost input value are tabulated. For example, flock medium producing average 50 mass, ...