Amubode F O, Fetuga B L
Beitr Trop Landwirtsch Veterinarmed. 1984;22(2):193-200.
The variations were tested in dietary methionine, protein, and caloric density on the glutamic-oxalacetate transaminase (GOT) and glutamic-pyruvate transaminase (GTP). The GOT was not affected by the protein and methionine levels either in the plasma or liver. Plasma GTP tended to increase (P less than 0.01) between 0.28% and 0.44% methionine levels in experiment I and between 0.26% and 0.50% in experiment 2. In the liver, the GTP activity was similar in both experiments. The interaction between methionine + cystine and protein was significant in their effect on the GTP activity. This enzyme decreased in the plasma with increasing methionine + cystine level, while it increased with increasing protein level. The GTP activity was negatively correlated (r = -0.52) with the energy level in the liver. From the trends of the GTP activity, the minimum and optimum methionine levels in broiler diets can be derived.
对日粮中蛋氨酸、蛋白质和热量密度的变化对谷草转氨酶（GOT）和谷丙转氨酶（GPT）的影响进行了测试。血浆和肝脏中的GOT不受蛋白质和蛋氨酸水平的影响。在实验1中，蛋氨酸水平在0.28%至0.44%之间时，血浆GPT有升高趋势（P<0.01）；在实验2中，蛋氨酸水平在0.26%至0.50%之间时，血浆GPT也有升高趋势。在肝脏中，两个实验的GPT活性相似。蛋氨酸+胱氨酸与蛋白质之间的相互作用对GPT活性的影响显著。随着蛋氨酸+胱氨酸水平的升高，血浆中该酶活性降低，而随着蛋白质水平的升高，血浆中该酶活性升高。肝脏中的GPT活性与能量水平呈负相关（r=-0.52）。根据GPT活性的变化趋势，可以得出肉鸡日粮中蛋氨酸的最低和最佳水平。
