Geraert P A, Leclercq B, Larbier M
Station de recherches Avicoles, I.N.R.A., Monnaie, France.
Reprod Nutr Dev (1980). 1987;27(6):1041-51. doi: 10.1051/rnd:19870807.
Two experiments were conducted to investigate the effects of pair-feeding, nutritional status (fasting vs feeding ad libitum) and supplementing diets with alanine (2 g/kg), threonine (2 g/kg), glutamic acid (5 g/kg) and arginine (5 g/kg) on growth performance, body composition and free plasma amino acid levels in genetically lean (LL) or fat (FL) chickens of 4 to 7 weeks of age. When fed ad libitum, FL chickens ate more than LL birds and showed higher lipid and protein gains. However, when pair-fed, FL birds exhibited increased lipid retention but lower protein gain. Growth performance and body composition were not significantly affected by the addition of glucogenic amino acids to the diets. However, amino acid supplementation slightly improved food to gain ratios but depressed gross energy and protein efficiencies in both lines. FL chickens had lower plasma levels of most glucogenic amino acids and higher levels of branched-chain and sulphur amino acids than LL birds, irrespective of diet and nutritional status. These results are discussed in relation to hormonal characteristics of FL and LL birds.
进行了两项实验，以研究配对饲养、营养状况（禁食与自由采食）以及在日粮中添加丙氨酸（2克/千克）、苏氨酸（2克/千克）、谷氨酸（5克/千克）和精氨酸（5克/千克）对4至7周龄遗传型瘦鸡（LL）或肥鸡（FL）生长性能、体成分和血浆游离氨基酸水平的影响。自由采食时，FL鸡比LL鸡吃得更多，且脂质和蛋白质增重更高。然而，配对饲养时，FL鸡的脂质保留增加，但蛋白质增重降低。日粮中添加生糖氨基酸对生长性能和体成分没有显著影响。然而，补充氨基酸略微改善了料重比，但降低了两个品系的总能和蛋白质效率。无论日粮和营养状况如何，FL鸡的大多数生糖氨基酸血浆水平低于LL鸡，而支链和含硫氨基酸水平高于LL鸡。结合FL和LL鸡的激素特征对这些结果进行了讨论。
