AA肉仔鸡氨基酸维持模式的确立

The Amino Acid Pattern for Maintenance Requirements of Broilers

分别选取体重均匀、健康一致的2与6周龄AA肉仔鸡各72只,随机分成2个处理,每处理6个重复,每重复6只鸡(公母各半),分别饲喂无氮与低氮日粮。以无氮日粮测定内源性氨基酸排泄量,以低氮日粮测定羽毛、皮屑等脱落造成的氨基酸排泄量。结果发现,除了甘氨酸、胱氨酸外其他15种氨基酸的维持需要量(mg/g BW2/3.d)在2与6周龄间差异显著(P<0.05)。氨基酸模式的差异说明0～3周龄肉仔鸡与成年肉仔鸡的氨基酸需要量模式是不同的。因此,2、6周龄的氨基酸维持模式可分别作为0～3、4～8周龄肉仔鸡的氨基酸维持模式。

A total of seventy-two of 2-week-old,6-week-old AA broilers were randomly arranged into two treatments with 6 replicates of 6 broilers（3：male,3：female）,fed diets with nitrogen free diet and low nitrogen diet,separately.Endogenesis amino acid excretion was determined by nitrogen free diet.Amino acid excretion from feather loss,scurf loss et al was determined by low nitrogen diet.The results indicated that the requirements of fifteen amino acids except Gly,Cys for maintenance were significantly different between 14 and 42-day-old（P0.05）.Amino acid pattern was different between broilers of 0 to 3-week-old and adult broilers.In conclusion,the amino acid patterns of 2-week-old and 6-week-old broilers for maintenance could be regarded as that of 0 to 3-week-old and 4 to 8-week-old broilers,respectively.