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

饲粮精料水平和蛋氨酸铬添加剂量对舍饲滩羊生长性能、屠宰性能、肉品质和脂肪沉积的影响

  • 金亚东 ,
  • 贾柔 ,
  • 周玉香 ,
  • 马青
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  • 1. 宁夏大学农学院, 银川 750021;
    2. 宁夏农林科学院动物科学研究所, 银川 750002
金亚东(1990-),男,河南南阳人,博士研究生,研究方向为动物营养与饲料科学。E-mail:1589178228@qq.com

收稿日期: 2020-07-05

  网络出版日期: 2021-02-04

基金资助

宁夏高端滩羊肉生产关键技术研究与集成示范(2018BBF02016)

Effects of Dietary Concentrate Level and Chromium Methionine Adding Dosage on Growth Performance, Carcass Characteristics, Meat Quality and Fat Deposition of Stabling Tan Lambs

  • JIN Yadong ,
  • JIA Rou ,
  • ZHOU Yuxiang ,
  • MA Qing
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  • 1. College of Agriculture in Ningxia University, Yinchuan 750021, China;
    2. Research Center of Grass and Livestock, Ningxia Academy of Agriculture and Forestry Science, Yinchuan 750002, China

Received date: 2020-07-05

  Online published: 2021-02-04

Supported by

 

摘要

本试验旨在探究饲粮精料水平和蛋氨酸铬(Cr-Met)添加剂量对舍饲滩羊生长性能、屠宰性能、肉品质和脂肪沉积的影响。采用2×3双因素试验设计,2个因素分别为饲粮精料水平和Cr-Met添加剂量,其中饲粮精料水平分别设为35%(低精料饲粮,饲粮精粗比为35:65)和55%(高精料饲粮,饲粮精粗比为55:45),Cr-Met添加剂量分别设为0、0.75和1.50 g/(d·只)。将60只雄性滩羊羔羊[平均体重为(21±1) kg]随机分配到6个试验组,每组10只。试验期为80 d,其中预试期15 d,正试期65 d。结果显示:1)与低精料饲粮组相比,高精料饲粮组滩羊的平均日增重、屠宰率、背膘厚度、肌内脂肪含量和后腿肉比重显著增加(P<0.05),但料重比与肌肉蒸煮损失、剪切力、pH、亮度(L*)值、红度(a*)值和黄度(b*)值则显著降低(P<0.05)。2)低精料饲粮组滩羊背膘厚度、皮下脂肪厚度、肌内脂肪含量和后腿肉比重随Cr-Met添加剂量的增加而线性降低(P<0.05),但肌肉pH则线性升高(P<0.05)。3)高精料饲粮组滩羊肋肉比重、腰肉比重以及肌肉剪切力和pH随Cr-Met添加剂量的增加而线性升高(P<0.05),而肌内脂肪含量和肌肉a*值则线性降低(P<0.05)。综合本试验测定指标,建议在滩羊养殖中选择精粗比为55:45的高精料饲粮,Cr-Met的适宜添加剂量为1.50 g/(d·只),且不建议在精粗比为35:65的低精料饲粮中添加Cr-Met。

本文引用格式

金亚东 , 贾柔 , 周玉香 , 马青 . 饲粮精料水平和蛋氨酸铬添加剂量对舍饲滩羊生长性能、屠宰性能、肉品质和脂肪沉积的影响[J]. 动物营养学报, 2021 , 33(2) : 888 -899 . DOI: 10.3969/j.issn.1006-267x.2021.02.030

Abstract

This experiment was conducted to evaluate the effects of dietary concentrate level and chromium methionine (Cr-Met) adding dosage on the growth performance, carcass characteristics, meat quality and fat deposition of stabling Tan lambs. A 2×3 two-factor factorial design was adopted in this experiment. Factor 1 was dietary concentrate level, and it was 35% (low concentrate diet, dietary concentrate-to-forage ratio was 35:65) and 55% (high concentrate diet, dietary concentrate-to-forage ratio was 55:45), respectively. Factor 2 was Cr-Met adding dosage, and it was 0, 0.75 and 1.50 g/(d·lamb), respectively. Sixty male Tan lambs [average body weight: (21±1) kg] were randomly assigned into 6 trial groups with 10 lambs per group. The experimental period was 80 days containing 15-day pre-experiment and 65-day formal experiment. The results showed as follows: 1) compared with low concentrate diet group, the average daily gain, dressing percentage, backfat thickness, intramuscular fat content and leg proportion of lambs from the high concentrate diet group were significantly increased (P<0.05), but the feed/gain and muscle cooking loss, shear force, pH, lightness (L*) value, redness (a*) value and yellowness (b*) value were significantly decreased (P<0.05). 2) Lambs from the low concentrate diet group, there was a linear decrease in backfat thickness, subcutaneous fat thickness, intramuscular fat content and leg proportion (P<0.05), but a linear increase in muscle pH with increasing Cr-Met adding dosage (P<0.05). Lambs from the high concentrate diet group, the rib proportion, loin proportion and muscle shear force, and pH exhibited a linear increase (P<0.05), whereas the intramuscular fat content and muscle a* value showed a linear decrease with increasing Cr-Met adding dosage (P<0.05). Considering all the measured indexes of this experiment, it is suggested that the optimum dietary concentrate-to-forage ratio for Tan lamp is 55:45, the optimum Cr-Met adding dosage is 1.50 g/(d·lamb) and it is not recommended in low concentrate diet.

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