Cohen-Parsons M, Leighton A T, Webb K E
Br Poult Sci. 1983 Jul;24(3):287-93. doi: 10.1080/00071668308416742.
Two hundred and six female breeder turkeys were fed on maize-soybean diets of equal energy content, containing 100, 120 or 140 g crude protein (CP)/kg to which DL-methionine was added at 0, 1, 2 or 3 g/kg diet in a factorial design. Serum albumin concentrations were found to be more sensitive measures of dietary protein adequacy than were total serum protein concentrations. Albumin concentrations at peak egg production were highest among birds fed on 120 and 140 g CP/kg diets. Four weeks later, they were highest only for those on the 140 g CP/kg diet. The elevated concentrations of blood threonine and lysine and the decreased concentration of glycine with increased dietary protein were in agreement with the data on egg production. These data suggested that a sub-optimal balance of dietary amino acids may have occurred.
206只雌性种火鸡被饲喂能量含量相等的玉米-大豆日粮，日粮含粗蛋白（CP）100、120或140克/千克，并采用析因设计在日粮中分别添加0、1、2或3克/千克的DL-蛋氨酸。结果发现，血清白蛋白浓度比总血清蛋白浓度更能敏感地衡量日粮蛋白质的充足程度。产蛋高峰期，采食120和140克CP/千克日粮的火鸡血清白蛋白浓度最高。四周后，只有采食140克CP/千克日粮的火鸡血清白蛋白浓度最高。随着日粮蛋白质增加，血液苏氨酸和赖氨酸浓度升高，甘氨酸浓度降低，这与产蛋数据一致。这些数据表明，日粮氨基酸可能出现了次优平衡。
