A formal method of determining the dietary amino acid requirements of laying‐type pullets during their growing period

摘要: 1. The amino acid requirements of laying type pullets during the growing period can be estimated by measuring growth different components body and making use nutritional constants that define amount each is required for production tissues being formed. 2. In this experiment, carcase analyses three breeds were conducted at weekly intervals throughout pullets, to 18 weeks age. Measurements made weight, gut-fill feather chemical consisted water, protein, lipid ash measurements both feathers. Each age group comprised 10 birds breed. 3. Gompertz functions accurately protein age, from which rate these two could estimated. mature weight was overestimated curve, may indicate a pullet ceases increase in content once sexual maturity has been reached. 4. Using allometric relationships between feathers, all protein. These then added together determine as whole. 5. daily 4 calculated, namely, those maintenance gain summed requirement on day period. 6. 'effective energy' system, energy calculated period, desired food intake predicted. By dividing it possible concentration acids would needed diet order meet pullet. 7. results ratio lysine methionine cysteine changes dramatically negating concept fixed growth.(ABSTRACT TRUNCATED AT 400 WORDS)