Effects of Concentrates with Different Protein Levels on Growth Performance, Slaughter Performance and Serum Biochemical Indexes of Guangfeng Goats

  • ZHAN Jinshun ,
  • ZHONG Xiaojun ,
  • ZHAN Qingbiao ,
  • FANG Shaopei ,
  • HUO Junhong ,
  • WU Yanping
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  • 1. Institute of Animal Husbandry and Veterinary, Jiangxi Academy of Agricultural Science, Nanchang 330200, China;
    2. Animal Husbandry and Veterinary Bureau of Yushan, Shangrao 334700, China

Received date: 2020-06-22

  Online published: 2021-01-18

Abstract

The purpose of this experiment was to study the effects of concentrates with different protein levels on growth performance, slaughter performance and serum biochemical indexes of Guangfeng goats. Thirty healthy goats with the similar body weight and age about 3 months were chosen and randomly divided into 3 groups with 10 goats (half male and half female) per group. Goats in the 3 groups were fed concentrates with high (22.87%, group H), medium (19.07%, group M) and low (15.23%, group L) protein levels, respectively. The roughage was fresh wild grass of Miscanthus, and the forage to concentrate ratio was 50 ∶ 50 in all groups. The experimental period was 84 days including 14 days of adaptation period and 70 days of formal period. The results showed as follow: 1) the body height of goats in group L was significantly lower than that of other two groups on day 35 of formal period (P<0.05), but the result of feed to gain ratio was opposite. The other growth performance indexes were no significant differences among all groups (P>0.05). 2) The content of serum urea nitrogen of goats in group H was significantly higher than that in other two groups on day 14 of formal period (P<0.01), and the content of serum urea nitrogen in group M was the lowest. The content of serum urea nitrogen of goats in group L was significantly higher than that in group M on day 35 of formal period (P<0.05). The content of serum urea nitrogen of goats in groups H and L was significantly higher than that in group M on day 70 of formal period (P<0.05). 3) The loin muscle area of goats in group H was significantly higher than that in group M (P<0.05), and the other slaughter performance indexes were no significant differences among all groups (P>0.05). The weight of omasum and abomasum and the index of omasum in group M were significantly lower than those in group L (P<0.05), but the index of lung was significantly higher than that in group L (P<0.05). The heart weight and heart index in group H were significantly lower than those in group L (P<0.05). In conclusion, the concentrate with protein level of 19.07% can meet the fattening requirement of Guangfeng goats under this experiment conditions.

Cite this article

ZHAN Jinshun , ZHONG Xiaojun , ZHAN Qingbiao , FANG Shaopei , HUO Junhong , WU Yanping . Effects of Concentrates with Different Protein Levels on Growth Performance, Slaughter Performance and Serum Biochemical Indexes of Guangfeng Goats[J]. Chinese Journal of Animal Nutrition, 2021 , 33(1) : 528 -536 . DOI: 10.3969/j.issn.1006-267x.2021.01.053

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