Short Communications

Coated Vitamin A:Effects on Ruminal Fermentation Characteristics and Nutrient Apparent Digestibility of Dairy Cows

  • JIN Lu ,
  • YAN Sumei ,
  • BAO Hongyun ,
  • GONG Jian ,
  • SUN Juan ,
  • SHI Huiyu ,
  • LI Junliang
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  • College of Animal Science, Inner Mongolia Agricultural University, Huhhot 010018, China

Received date: 2014-01-17

  Online published: 2014-07-01

Abstract

This study was conducted to determine the effects of different levels of coated vitamin A on ruminal fermentation characteristics and nutrient apparent digestibility of dairy cows. Twenty-eight Holstein cows were used in a single factor randomized block arrangement and were divided into 2 groups with 14 replicates in each group by the principle of similar body weight, milk yield and parity. Coated vitamin A at two levels (110 and 220 IU/kg BW, respectively) was supplemented to a basal diet (concentrate:roughage was 42:58). Pre-trial period was 15 days and trial period was 60 days. The results showed as follows: compared with 110 IU/kg BW group, vitamin A content, propionate acid concentration and ether extract apparent digestibility in rumen fluid in 220 IU/kg BW group could be significantly increased (P0.05). Based on recommend requirement in NRC (2001) (110 IU/kg BW), further increased coated vitamin A level to 220 IU/kg BW can promote digestion of ether extract and increase vitamin A content and propionate acid concentration in rumen fluid without affecting the function of ruminal fermentation.

Cite this article

JIN Lu , YAN Sumei , BAO Hongyun , GONG Jian , SUN Juan , SHI Huiyu , LI Junliang . Coated Vitamin A:Effects on Ruminal Fermentation Characteristics and Nutrient Apparent Digestibility of Dairy Cows[J]. Chinese Journal of Animal Nutrition, 2014 , 26(7) : 1968 -1974 . DOI: 10.3969/j.issn.1006-267x.2014.07.031

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