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Acta Prataculturae Sinica ›› 2014, Vol. 23 ›› Issue (5): 287-294.DOI: 10.11686/cyxb20140534

• Orginal Article • Previous Articles     Next Articles

Nitrogen metabolism in sika deer on a low protein diet supplemented with lysine and methionine

HUANG Jian,ZHANG Tie-tao,BAO Kun,YANG Fu-he,LI Guang-yu,WANG Kai-ying   

  1. Institute of Special Wild Economic Animal and Plant Science, CAAS, Changchun 130112, China
  • Received:2014-03-07 Online:2014-10-20 Published:2014-10-20

Abstract:

The effect of a low crude protein (CP) diet supplemented with amino acids on nitrogen metabolism in four three month old sika deer fawns [mean live weight (30±0.12) kg] was investigated using a 4×4 Latin square design experiment. Four diets were compared; control (groupⅠ) fed a 16.28% crude protein diet, a group fed 13.40 % CP diet supplemented with 0.23% lysine and 0 (group Ⅱ), 0.06% (group Ⅲ), 0.12% (group Ⅳ) methionine. The results show that the CP digestibility of the control group was significantly greater than group Ⅱ (P<0.01), Ⅲ and Ⅳ (P<0.05) but ether extract digestibility was lower than group Ⅱ (P<0.01). No treatment differences for other nutrients were found (P>0.05). Methionine digestibility in the control group and group Ⅳ was significantly greater than group Ⅱ and group Ⅲ (P<0.05); digestibility of other amino acids (except lysine and cystine) in the control group was significantly greater than all other groups (P<0.05). Nitrogen (N) absorption in the control group was significantly greater than group Ⅱ (P<0.01), Ⅲ and Ⅳ (P<0.05) while urine N emissions were significantly greater and N utilization lower than other groups (P<0.05). Total urine purine emissions in the control group were significantly greater than group Ⅱ (P<0.01) and Ⅲ (P<0.05) and allantoin emissions significantly greater than group Ⅱ (P<0.01), Ⅲ and Ⅳ (P<0.05). Xanthine and hypoxanthine emissions in group Ⅱ was significantly lower than the control group (P<0.01), groups Ⅲ and Ⅳ (P<0.05). Supplementing with lysine and methionine improved the apparent digestibility of a low CP diet, approaching the digestibility of diets with a normal protein content and improving N retention and N utilization, reducing N emissions and helping to protect the environment.

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