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Effects of vitamin A supplementation on growth performance, carcass characteristics and meat quality in Limosin x Luxi crossbreed steers fed a wheat straw-based diet

文献类型: 外文期刊

作者: Wang, W. J. 1 ; Wang, S. P. 1 ; Gong, Y. S. 4 ; Wang, J. Q. 5 ; Tan, Z. L. 1 ;

作者机构: 1.Chinese Acad Sci, Inst Subtrop Agr, Key Lab Subtrop Agr Ecol, Changsha 410125, Peoples R China

2.SW Univ, Dept Anim Sci, Chongqing 402460, Peoples R China

3.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China

4.NW A&F Univ, Yangling 712100, Peoples R China

5.Chinese Acad Agr Sci, Inst Anim Sci, Beijing 100094, Peoples R China

关键词: steers;vitamin A;meat quality;performance

期刊名称:MEAT SCIENCE ( 影响因子:5.209; 五年影响因子:5.305 )

ISSN: 0309-1740

年卷期: 2007 年 77 卷 4 期

页码:

收录情况: SCI

摘要: Three experiments were conducted to examine the effects of dietary vitamin A supplementation on performance and carcass parameters in Limosin x Luxi crossbreed finishing steers fed a wheat straw-based diet. Sixteen 12-month old (301 +/- 22 kg) steers, 16 12-month old (309 +/- 15 kg) steers and 16 24-month old (411 +/- 20 kg) steers were used in experiment 1 for 6 months feeding period, in experiment 2 for three months feeding period and in experiment 3 for three months feeding period, respectively. Sixteen steers of each experiment were randomly divided into the four groups of four animals. Treatments consisted of four vitamin A supplementation levels (0, 1100, 2200 and 4400IU/kg DM). The growth rate was affected by dietary vitamin A level in experiment 1 and 2, revealing that the suitable amount of vitamin A supplementation increased the growth rate; excessive vitamin A in the ration decreased the growth rate of 12-month-old finishing steers. The marbling deposition decreased with the increment of vitamin A supplementation level, but possibly associated with vitamin A supplementing duration. Furthermore, the suitable dietary vitamin A level probably decreased lipid and pigment oxidation, and increased the tenderness of beef meat. Vitamin A supplementation had no significant effect on chemical composition of gluteus medius muscle and longissimus dorsi muscle. (C) 2007 Elsevier Ltd. All rights reserved.

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