Amino-Acid Requirements and Timing for Shift of Diets for Effective Phase Feeding of Laying Hens.
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概要
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To investigate the timing for shift of diets and dietary amino acid levels for effective phase feeding of laying hens, the laying period from 20 to 80 weeks of age was divided into 6 periods of 10 weeks each, and the amino acid requirements in each period were estimated as a ratio to the NRC requirements. In addition, the effects of dietary amino acid levels and age on the eggshell strength and Haugh unit were studied. The contents of 5 essential amino acids (lysine, methionine, threonine, isoleucine and tryptophan) of diets were adjusted to be 85, 100, 115, 130 or 160% of the NRC requirements. Each diet was fed ad libitum to 10 hens for 4 weeks in each period.Performances of hens fed 130 and 160% diets in the period from 20 to 30 weeks were superior to other groups but not significant. Therefore, amino acid requirement in this period was not estimated exactly. Amino acid requirements calculated from egg production and egg mass were 105-118% from 30 to 60 weeks and 100-104% from 60 to 80 weeks. The egg weight increased with increasing dietary amino acid levels in any period. This tendency was remarkable in young hens. The Haugh unit tended to decrease with age, but there was no difference among the diets. However, eggshell strength tended to weaken with increasing amino acid levels during 30 to 50 weeks.The timing for shift of diets and dietary amino acid levels for phase feeding of laying hens from 20 to 80 weeks of age were estimated as follows: 20-30 weeks, 130%; 30-60 weeks, 115% and 60-80 weeks, 100% of the NRC requirements, respectively.
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