Effects of Alfalfa Replacement by Rice Straw or Corn Stover on Nitrogen Metabolism, Serum Physiological-Biochemical Indices and Histomorphology of Liver and Kidney of Dairy Cows

WANG Bing, JIANG Linshu, LIU Jianxin

doi:10.3969/j.issn.1006-267x.2017.06.013

2017 , Vol. 29 >Issue 6: 1921 - 1929

DOI: https://doi.org/10.3969/j.issn.1006-267x.2017.06.013

Molecular Nutrition

Effects of Alfalfa Replacement by Rice Straw or Corn Stover on Nitrogen Metabolism, Serum Physiological-Biochemical Indices and Histomorphology of Liver and Kidney of Dairy Cows

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1. Key Laboratory for Dairy Cow Nutrition, College of Animal Science and Technology, Beijing University of Agriculture, Beijing 102206, China;
2. Key Laboratory of Molecular Animal Nutrition of Ministry of Education, Institute of Dairy Science, Zhejiang University, Hangzhou 310058, China

Received date: 2016-12-07

Online published: 2017-06-07

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Abstract

The aim of this study was to investigate the effects of alfalfa replacement by rice straw or corn stover on nitrogen metabolism, serum physiological-biochemical indices and histomorphology of liver and kidney of dairy cows. Forty-five multiparous Holstein dairy cows were blocked and randomly assigned to 3 groups with 15 cows per group. Cows in the 3 groups were fed with different roughages:alfalfa group (23% alfalfa hay and 7% Chinese wild rye hay, AH group), corn stover group (30% corn stover, CS group) and rice straw group (30% rice straw, RS group), dietary forage to concentrate ratio was 55:45. The experiment lasted for 12 weeks. The results showed that the fecal nitrogen excretion of cows in CS group and RS group was significanly higher than that in AH group (P<0.05), the urinary nitrogen excretion of cows in RS group was significanly higher than that in AH group and CS group (P<0.05). The serum urea nitrogen and creatinine contents of cows in RS group were significanly higher than those in AH group (P<0.05). The serum total cholesterol content in RS group was significanly higher than that in AH group and CS group (P<0.05). The serum alanine aminotransferase activity in CS group was significanly higher than that in AH (P<0.05), while the serum glutamic oxaloacetic transaminase activity was significanly higher than that in AH group and RS group (P<0.05). The histological structure of liver and kidney in each group was clear, and no obvious abnormality was found. From above, the greater excretion of fecal nitrogen and urinary nitrogen of cows fed rice straw or corn stover resulte lower nitrogen conversion efficiency to milk protein of cows. No apparent morphological changes in liver and kidney are observed. However, the serum indexes responding the healthy function of liver and kidney are increased when cows fed with corn stover or rice straw.

Key words： dairy cows; nitrogen metabolism; liver; serum

Cite this article

WANG Bing, JIANG Linshu, LIU Jianxin . Effects of Alfalfa Replacement by Rice Straw or Corn Stover on Nitrogen Metabolism, Serum Physiological-Biochemical Indices and Histomorphology of Liver and Kidney of Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2017 , 29(6) : 1921 -1929 . DOI: 10.3969/j.issn.1006-267x.2017.06.013

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