RUMINANT AND HERBIVORE NUTRITION AND FEED

Effects of Different Supplementary Feeding Levels on Growth Performance, Slaughter Performance, Muscle Quality and Gastrointestinal Development of Grazing Yimeng Black Goats

  • CHENG Guangmin
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  • Shandong Vocational Animal Science and Veterinary College, Weifang 261061, China

Received date: 2021-02-03

  Online published: 2021-09-18

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Abstract

The purpose of this experiment was to study the effects of different supplementary feeding levels on growth performance, slaughter performance, muscle quality and gastrointestinal development of grazing Yimeng black goats, so as to provide scientific basis for healthy feeding of Yimeng black goats. A total of 100 Yimeng black goats were randomly divided into 4 groups with 5 replicates per group and 5 goats per replicate (male:female=2:3) in each group. They were all fed with grazing and supplementary feeding mode, and the experimental goats were fed with 0 (control group), 0.10, 0.15 and 0.20 kg/(d·head) concentrate supplementary feed. After 10 days of pre feeding period, it entered the formal period of 120 days. The results showed as follows:1) the final body weight, increased body weight, final body length, final body height, increased canno circumference and final waist width of experimental groups were significantly higher than those of the control group (P<0.05), and the increased body length, increased body height, final canno circumference and increased waist width of supplementary feeding 0.20 kg/(d·head) group were significantly higher than those of the control group (P<0.05). The average daily gain of experimental groups was significantly higher than that of the control group (P<0.05), and supplementary feeding 0.20 kg/(d·head) group was higher than supplementary feeding 0.10 kg/(d·head) group (P<0.05). 2) The pre-slaughter weight, carcass weight and eye muscle area of experimental groups were significantly higher than those of the control group (P<0.05), and the ham percentage of supplementary feeding 0.20 kg/(d·head) group was significantly higher than that of the control group and supplementary feeding 0.10 kg/(d·head) group (P<0.05). 3) The muscle pH24 h of supplementary feeding 0.20 kg/(d·head) group was significantly lower than that of the control group (P<0.05), and the muscle shear force of supplementary feeding 0.15 and 0.20 kg/(d·head) groups was significantly lower than that of the control group (P<0.05). The muscle ether extract content of experimental groups was significantly higher than that of the control group (P<0.05), and the muscle ash content of experimental groups was significantly lower than that of the control group (P<0.05). 4) The relative weight of stomach of experimental groups was significantly lower than that of the control group (P<0.05), and the rumen fluid pH, rumen relative weight and total length of small intestine of supplementary feeding 0.20 kg/(d·head) group were significantly lower than that of the control group and supplementary feeding 0.10 kg/(d·head) group (P<0.05). The length of rumen papilla, villus height of duodenum, crypt depth of duodenum, crypt depth of jejunum and villus height of ileum of supplementary feeding 0.15 kg/(d·head) group were significantly higher than those of the control group (P<0.05). In conclusion, supplementary feeding the concentrate supplementary feed can improve the growth performance, muscle quality and gastrointestinal development of grazing Yimeng black goats. Under the conditions of this experiment, combining with the growth performance, slaughter performance and other indexes, it is suitable to supplement 0.15 to 0.20 kg/(d·head) concentrate supplementary feed of Yimeng black goats during growing period.

Cite this article

CHENG Guangmin . Effects of Different Supplementary Feeding Levels on Growth Performance, Slaughter Performance, Muscle Quality and Gastrointestinal Development of Grazing Yimeng Black Goats[J]. Chinese Journal of Animal Nutrition, 2021 , 33(9) : 5007 -5015 . DOI: 10.3969/j.issn.1006-267x.2021.09.021

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