反刍与草食动物营养与饲料 RUMINANT AND HERBIVORE NUTRITION AND FEED

荞麦秸秆饲粮中添加过瘤胃赖氨酸对滩羊血清生化指标、屠宰性能和肉品质的影响

  • 高昌鹏 ,
  • 周玉香
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  • 宁夏大学农学院, 银川 750021
高昌鹏(1993-),男,甘肃通渭人,硕士研究生,研究方向为动物营养与饲料科学。E-mail:cpgao728@163.com

收稿日期: 2020-07-12

  网络出版日期: 2021-02-04

基金资助

公益性行业(农业)科研专项(201503134)

Effects of Buckwheat Straw Diet Supplemented with Rumen-Protected Lysine on Serum Biochemical Indexes, Slaughter Performance and Meat Quality of Tan Sheep

  • GAO Changpeng ,
  • ZHOU Yuxiang
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  • College of Agriculture, Ningxia University, Yinchuan 750021, China

Received date: 2020-07-12

  Online published: 2021-02-04

Supported by

 

摘要

本试验旨在研究荞麦秸秆饲粮中添加过瘤胃赖氨酸(RPLys)对滩羊血清生化指标、屠宰性能和肉品质的影响。选用20只体重相近、健康无病的5月龄宁夏滩羊羯羊,随机分为5组,每组4只羊。对照组饲喂基础饲粮,试验Ⅰ、Ⅱ、Ⅲ、Ⅳ组分别在基础饲粮中添加2.5、5.0、7.5、10.0 g/d RPLys。预试期15 d,正试期60 d。结果表明:1)第30天时,各试验组血清总蛋白含量均显著高于对照组(P<0.05);第60天时,试验Ⅰ组血清总蛋白含量显著高于对照组(P<0.05)。2)第15、30天时,试验Ⅱ组血清尿素氮含量显著低于对照组(P<0.05);第60天时,各试验组血清尿素氮含量均显著低于对照组(P<0.05)。3)第45天时,试验Ⅲ、Ⅳ组血清葡萄糖含量显著高于对照组(P<0.05);第60天时,试验Ⅳ组血清葡萄糖含量显著高于对照组和试验Ⅱ组(P<0.05)。4)对照组和试验Ⅲ组的胴体净肉率显著高于试验Ⅳ组(P<0.05),试验Ⅳ组的胴体脂肪重显著高于对照组(P<0.05)。5)各试验组的失水率均显著低于对照组(P<0.05),试验Ⅳ组的肉色黄度和亮度值显著高于对照组(P<0.05),试验Ⅰ、Ⅳ组的熟肉率显著高于对照组(P<0.05),试验Ⅱ、Ⅲ组的剪切力显著低于对照组(P<0.05),试验Ⅰ、Ⅲ和Ⅳ组的羊肉粗脂肪含量显著低于对照组(P<0.05),试验Ⅰ组的羊肉粗蛋白质含量显著高于对照组(P<0.05)。综上所述,荞麦秸秆饲粮中添加RPLys能够降低羊肉失水率,并可在一定程度上改善滩羊血清生化指标。本试验条件下,荞麦秸秆饲粮中RPLys的适宜添加量为7.5 g/d。

本文引用格式

高昌鹏 , 周玉香 . 荞麦秸秆饲粮中添加过瘤胃赖氨酸对滩羊血清生化指标、屠宰性能和肉品质的影响[J]. 动物营养学报, 2021 , 33(2) : 932 -943 . DOI: 10.3969/j.issn.1006-267x.2021.02.034

Abstract

The objective of the present experiment was to determine the effects of buckwheat straw diet supplemented with rumen-protected lysine (RPLys) on serum biochemical indexes, slaughter performance and meat quality of Tan sheep. Twenty healthy five-month-old Ningxia Tan sheep with similar body weight were randomly divided into 5 groups with 4 sheep in each group. Sheep in the control group were fed a basal diet, while sheep in trial groups Ⅰ, Ⅱ, Ⅲ and Ⅳ were fed the basal diets supplemented with 2.5, 5.0, 7.5 and 10.0 g/d RPLys, respectively. The preparation period was 15 days, and the formal experiment period was 60 days. The results showed as follows: 1) on day 30, the serum total protein content of each trial groups was significantly higher than that of the control group (P<0.05); on day 60, the serum total protein content of trial group Ⅰ was significantly higher than that of the control group (P<0.05). 2) On days 15 and 30, the serum urea nitrogen content of trial group Ⅱ was significantly lower than that of the control group (P<0.05); on day 60, the serum urea nitrogen content of each trial groups was significantly lower than that of the control group (P<0.05). 3) On day 45, the serum glucose content of trial groups Ⅲ and Ⅳ was significantly higher than that of the control group (P<0.05); on day 60, the serum glucose content of trial group Ⅳ was significantly higher than that of control group and trial group Ⅱ (P<0.05). 4) The carcass net meat percentage of control group and trial group Ⅲ was significantly higher than that of trial group Ⅳ (P<0.05), and the carcass fat weight of trial group Ⅳ was significantly higher than that of the control group (P<0.05). 5) The water loss rate of each trial groups was significantly lower than that of the control group (P<0.05), the values of yellowness and brightness of meat color of trial group Ⅳ were significantly higher than those of the control group (P<0.05), the cooked meat rate of trial groups Ⅰ and Ⅳ was significantly higher than that of the control group (P<0.05), the shear force of trial groups Ⅱ and Ⅲ was significantly lower than that of the control group (P<0.05), the mutton ether extract content of trial groups Ⅰ, Ⅲ and Ⅳ was significantly lower than that of the control group (P<0.05), and the mutton crude protein content of trial group Ⅰ was significantly higher than that of the control group (P<0.05). In summary, the addition of RPLys in buckwheat straw diet can reduce the mutton water loss rate and improve the serum biochemical indexes of Tan sheep to some extent. Under this experimental condition, the optimal addition of RPLys in buckwheat straw diet is 7.5 g/d.

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