Effects of Relative Feeding Level on Growth Performance, Slaughter Performance, Organ Development and Meat Quality of Altai Sheep

  • LI Hong ,
  • WU Jianping ,
  • SONG Shuzhen ,
  • GAO Liangshuang ,
  • LANG Xia ,
  • LIU Lishan ,
  • GONG Xuyin ,
  • WANG Cailian
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  • 1. College of Animal Science and Technology, Gansu Agricultural University, Lanzhou 730070, China;
    2. New Rural Development Research Institute, Northwest Normal University, Lanzhou 730070, China;
    3. Key Laboratory of Cattle and Sheep Germplasm and Straw Feed in Gansu Province, Livestock and Green Agriculture Research Institute of Gansu Academy of Agricultural Sciences, Lanzhou 730070, China

Received date: 2019-10-22

  Online published: 2020-04-16

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Abstract

The purpose of this experiment was to study the effects of relative feeding level on growth performance, slaughtering performance, organ development and meat quality of Altay sheep. Thirty 3.0 to 3.5-month-old Altay female lambs with similar body weight[(19.16±0.54) kg], uniform tail and good health were randomly divided into 3 groups with 10 sheep per group. After freely fed for 60 days, by controlling the feed intake of experimental sheep, according to the energy for maintenance (Em) requirement of NRC (2007) feeding standard, sheep in the 3 groups were fed diets with 1.5 (0.75 MJ/kg W0.75, 1.5Em group), 1.0 (0.50 MJ/kg W0.75, 1.0Em group) and 0.5 times Em (0.25 MJ/kg W0.75, 0.5Em group) for 30 days. The results showed as follows:1) the final weight and average daily gain of 3 groups were significantly decreased with the relative feeding level decreased (P<0.01). 2) The live weight before slaughter and carcass weight of 3 groups were significantly decreased with the relative feeding level decreased (P<0.01). The slaughter rate, eye muscle area and GR value of 1.5Em group were significantly higher than those of 1.0Em group and 0.5Em group (P<0.05). 3) The weight and index of heart, liver, spleen and kidney of 1.5Em group were significantly higher than those of 1.0Em group and 0.5Em group (P<0.05 or P<0.01). The weight of heart, kidney and index of heart, liver, kidney of 1.0Em group were significantly higher than those of 0.5Em group (P<0.05 or P<0.01). The weight and index of wool+skin and head+feet of 1.5Em group were significantly higher than those of 1.0Em group and 0.5Em group (P<0.05 or P<0.01). 4) The brightness value in longissimus dorsi of 1.5Em group was significantly lower than that of 1.0Em group and 0.5Em group (P<0.05), and the water lose rate in longissimus dorsi of 1.0Em group was significantly lower than that of 1.5Em group and 0.5Em group (P<0.05). 5) The content of moisture in longissimus dorsi of 1.5Em group was significantly lower than that of 1.0Em group and 0.5Em group (P<0.05), and the content of ether extract in longissimus dorsi of 1.5Em group was significantly higher than that of 1.0Em group and 0.5Em group (P<0.05). In conclusion, the relative feeding level has significant effects on the average daily gain, slaughter performance, organ development and some meat quality indexes of Altay sheep.

Cite this article

LI Hong , WU Jianping , SONG Shuzhen , GAO Liangshuang , LANG Xia , LIU Lishan , GONG Xuyin , WANG Cailian . Effects of Relative Feeding Level on Growth Performance, Slaughter Performance, Organ Development and Meat Quality of Altai Sheep[J]. Chinese Journal of Animal Nutrition, 2020 , 32(4) : 1927 -1935 . DOI: 10.3969/j.issn.1006-267x.2020.04.053

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