日粮粗蛋白质和粗脂肪水平对生长貉营养物质消化率和氮代谢的影响

doi:10.16431/j.cnki.1671-7236.2020.03.014

Abstract

Abstract: The purpose of this study was to study the effects of dietary protein and ether extract levels on nutrient digestibility and nitrogen (N) metabolism of growing raccoon dogs.A total of 63 healthy 11 weeks old raccoon dogs were randomly divided into 9 groups according to a complete random design with 3×3 factorial arrangement.The 3 dietary protein levels were 22%,24% or 26%,and 3 ether extract levels were 5.5%,7.5% or 9.5%,respectively.The diets contained same levels of lysine,sulfur-containing amino acids and threonine.The experiment lasted for 56 d.The results showed that interaction between protein and ether extract did not affected the indices of either energy and nutrient digestibilities or nitrogen metabolism (P>0.05).The DM digestibility was affected by dietary protein level (P<0.05),in which the dogs fed diet with 22% protein had significantly higher value than those fed diet with 24% or 26% protein (P<0.05).The ether extraxt digestibility increased with the increasement of dietary ether extract level (P<0.05) and tend to increase with the increasement of dietary protein level (0.05 < P < 0.10).The N intake,fecal and urine N outputs,biological value (BV) and availability were affected by dietary protein level significantly (P<0.05),in which the BV values in groups of dietary protein levels of 22% and 24% were significantly higher than the values in groups of dietary protein levels of 26% (P<0.05).No differences were detected in N retentions among dietary protein levels (P>0.05).The urine N output,N retention,BV and N availability were affected significantly by dietary ether extract level (P<0.05),in which the N retention,BV and N availability in groups of dietary ether extract levels of 9.5% and 11.5% were significantly higher than the values in groups of dietary ether extract levels of 7.5% (P<0.05).These results suggested that diet containing lower protein and higher ether extract could decrease urine N output and improve protein availability and BV.

Key words: crude protein; ether extract; digestibility; nitrogen metabolism; raccoon dog

CLC Number:

S816.15

GONG Wenyang, LI Mo, NIU Yibing, DONG Xueyu, LI Yong, ZHANG Guixian, WANG Xiguo, GONG Yuanfang, SU Xin, YANG Liu, XING Guanzhong, FENG Minshan, LI Sufen. Effects of Dietary Protein and Ether Extract Levels on Nutrient Digestibility and Nitrogen Metabolism of Growing Raccoon Dogs[J]. China Animal Husbandry and Veterinary Medicine, 2020, 47(3): 763-770.

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Effects of Dietary Protein and Ether Extract Levels on Nutrient Digestibility and Nitrogen Metabolism of Growing Raccoon Dogs

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