Effects of Total Mixed Ration with Different Concentration-Roughage Ratios on Growth Performance, Serum Hormone Concentrations and Slaughter Performance of Hu Sheep

GAO Linqing, ZHAN Jinshun, HU Yao, ZHONG Xiaojun, YANG Qun, HU Lizhen, HUO Junhong

doi:10.3969/j.issn.1006-267x.2019.04.025

2019 , Vol. 31 >Issue 4: 1676 - 1684

DOI: https://doi.org/10.3969/j.issn.1006-267x.2019.04.025

Molecular Nutrition

Effects of Total Mixed Ration with Different Concentration-Roughage Ratios on Growth Performance, Serum Hormone Concentrations and Slaughter Performance of Hu Sheep

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1. Department of Husbandry and Veterinary, Changzhi Vocational and Technical College, Changzhi 046000, China;
2. Institute of Animal Husbandry and Veterinary, Jiangxi Academy of Agricultural Science, Nanchang 330200, China

Received date: 2018-09-29

Online published: 2019-04-16

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Abstract

The purpose of this experiment was to study the effects of total mixed ration with different concentration-roughage ratios on growth performance, serum hormone concentrations and slaughter performance of Hu sheep. Forty healthy Hu lambs with similar body weight and good body condition were randomly divided into four groups with ten sheep per group (half of male and female). Sheep in four groups were fed total mixed rations with concentration-roughage ratio of 70:30 (group Ⅰ), 60:40 (group Ⅱ), 50:50 (group Ⅲ) and 40:60 (group Ⅳ), respectively. The experimental period was 70 days containing 14-day pre-experiment and 56-day formal experiment. The results showed as follow:1) the average daily gain of sheep in group Ⅰ was significantly higher than that in groups Ⅲ and Ⅳ on day 14 and 35 of formal experiment (P<0.01); the body weight of sheep in group Ⅱ was significantly higher than that in group Ⅳ on day 35 and 56 of formal experiment (P<0.05). 2) The body length of sheep in group Ⅱ, the chest circumference and cannon-bone circumference of sheep in group Ⅰ were significantly higher than those in group Ⅳ on day 14 of formal experiment (P<0.05); the chest circumference and cannon-bone circumference of sheep in group Ⅰ were significantly higher than those in group Ⅳ and the serum leptin concentration of sheep in group Ⅰ was significantly higher than that in group Ⅳ on day 35 of formal experiment (P<0.05); the concentrations of growth hormone and tetraiodothyronine in serum of sheep in group Ⅰ were significantly higher than that in group Ⅳ (P<0.05) and the concentration of triiodothyronine in serum of sheep in groupⅡ was significantly higher than that of groups Ⅲ and Ⅳ on day 56 of formal experiment (P<0.05). 3) The live weight before slaughter, carcass weight, dressing percentage, hind leg weight, backfat thickness, rib meat thickness, heart weight and liver weight of sheep in group Ⅱ were significantly higher than those of group Ⅳ (P<0.01 or P<0.05). In conclusion, the growth performance and slaughter performance of Hu sheep fed total mixed ration with concentration-roughage ratio of 60:40 is optimum under this experiment condition.

Key words： Hu sheep; total mixed ration; growth performance; slaughter performance; serum hormones; body size indexes

Cite this article

GAO Linqing, ZHAN Jinshun, HU Yao, ZHONG Xiaojun, YANG Qun, HU Lizhen, HUO Junhong . Effects of Total Mixed Ration with Different Concentration-Roughage Ratios on Growth Performance, Serum Hormone Concentrations and Slaughter Performance of Hu Sheep[J]. Chinese Journal of Animal Nutrition, 2019 , 31(4) : 1676 -1684 . DOI: 10.3969/j.issn.1006-267x.2019.04.025

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