Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2021, Vol. 37 ›› Issue (20): 136-143.doi: 10.11924/j.issn.1000-6850.casb2020-0244

Special Issue: 生物技术 水产渔业

Previous Articles     Next Articles

Effects of Dietary Methionine and Cystine on Growth Performance, Methionine Metabolism and Protein Metabolism of Asian Red-tailed Catfish (Hemibagrus Wyckioides)

Zhang Xindang(), Li Guangbin, Wang Qiumei, Sun Yan, Huang Han, Su Linhai, Li Biwei, Deng Junming()   

  1. College of Animal Science and Technology, Yunnan Agricultural University, Yunnan Kunming 650201
  • Received:2020-07-08 Revised:2020-09-15 Online:2021-07-15 Published:2021-08-06
  • Contact: Deng Junming E-mail:zxdang1108@163.com;djunming@163.com

Abstract:

Previous experimental results showed that adding 0~1.5% methionine in the basic diet (0.5% methionine) had no significant effect on growth and biochemical indexes of Asian red-tailed catfish (Hemibagrus wyckioides), which is contrary to the traditional animal nutrition theory. Four experimental diets were formulated by adding crystal amino acid in the basic diet, including control diet (Con), methionine deficiency diet (-Met), cysteine deficiency diet (-Cys) and methionine and cysteine deficiency diet (-(Met+Cys)), and thereby to determine whether methionine is the essential amino acid for Hemibagrus wyckioides. The results showed that: The weight gain, feed intake and protein efficiency ratio of fish fed Con and -Cys diets were significantly higher than those of fish fed -Met and -(Met+Cys) diets. Conversely, the feed conversion rate was lower in fish fed Con and -Cys diets compared to fish fed -Met and -(Met+Cys) diets. The hepatic lipase activity of fish fed -Met and -(Met+Cys) diets was significantly lower than that of fish fed the Con diet. The disaccharidase activity was significantly higher in fish fed -Cys diet compared to that in fish fed Con diet. The hepatic AMPD activity of fish fed Con diet was significantly lower than that of fish fed -(Met+Cys) diet. Conversely, the alanine aminotransferase activity of fish fed -(Met+Cys) diet was significantly higher than that of other fish fed diets. The MAT and CBS activities of fish fed -Met diet were significantly higher than those of other fish fed diets. The BHMT activity of fish fed -(Met+Cys) diet was significantly higher than that of fish fed Con and -Cys diets. These results indicate that the lack of methionine could decrease the growth, protein metabolism and antioxidant capacity of Hemibagrus wyckioides. Therefore, methionine is the essential amino acid for Hemibagrus wyckioides.

Key words: Hemibagrus wyckioides, methionine, cysteine, growth performance, methionine metabolism, protein metabolism

CLC Number: