Synthesis of histidine in liver and kidney of cattle and swine
2001
Wadud, S. (Miyazaki Univ. (Japan). Faculty of Agriculture) | Onodera, R. | Or-Rashid, M.M.
The present experiments were conducted to examine if histidinol dehydrogenase (HLDase) activity could be detected in the liver and kidney of cattle, in order to assess the possibility that cattle synthesize histidine (His) de novo. Crude enzyme solutions of liver and kidney from Japanese black cattle showed HLDase activities with pH optima of ll.0 and 9.0, respectively. This is the first report of HLDase activity in animal tissues. The amount of His produced from histidinol (HDL) by the enzymes of the liver and kidney were calculated to be sufficient for meeting the His requirement of the cattle, based on the crude protein requirement for the animals and His content in muscle protein. In contrast, HLDase activities in swine liver and kidney proved to be insufficient to form sufficient His from HDL to meet their requirement as indicated in the Japanese Feeding Standard for Swine (1998).
Показать больше [+] Меньше [-]