| 荒漠草原放牧与舍饲对滩羊屠宰性能与肉品质的影响 |
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| 引用本文： | 赵新钢,郭艳萍,刘明,张灿,罗海玲.荒漠草原放牧与舍饲对滩羊屠宰性能与肉品质的影响[J].草业科学,2021,38(3):554-561. |
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| 作者姓名： | 赵新钢 郭艳萍 刘明 张灿 罗海玲 |
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| 作者单位： | 中国农业大学动物科学技术学院 动物营养学国家重点实验室,北京 100193 |
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| 基金项目： | 宁夏高端滩羊肉生产关键技术与集成示范(2018BBF02016);国家肉羊产业技术体系(CARS-38)。 |
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| 摘 要： | 为探究荒漠草原放牧与舍饲对滩羊屠宰性能和肉品质的影响,本研究将39只3月龄滩羊公羔分为荒漠草原放牧组(GZ)、限时放牧4 h补饲组(TG)和舍饲组(SF)3组,测定滩羊的屠宰性能与肉品质指标。结果显示:SF组滩羊的宰前活重、胴体重、屠宰率、净肉率和肉骨比显著优于TG组,TG组滩羊除肉骨比和净肉率外,显著优于GZ组(P<0.05);3种饲养模式滩羊的肉色、pH、剪切力、滴水损失指标差异不显著(P>0.05),但SF组的蒸煮损失显著低于GZ组与TG组(P<0.05);TG组与GZ组滩羊肌肉中的多不饱和脂肪酸C18?3n3,C20?5n3,C22?6n3,C18?2n6,C20?3n6,C20?4n6等含量显著高于SF组(P<0.05),且n-6/n-3脂肪酸比例显著低于SF组(P<0.05)。综上表明,荒漠草原放牧会提高滩羊肌肉中的不饱和脂肪酸含量,但会提高滩羊肌肉的蒸煮损失,降低滩羊的屠宰性能,而限时放牧补饲可以较大程度保留滩羊肌肉脂肪酸组成,同时提高滩羊的屠宰性能。
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| 关 键 词： | 饲养模式 限时放牧 滩羊 屠宰性能 蒸煮损失 滴水损失 脂肪酸构成 |
Effect of desert steppe grazing on slaughtering performance and meat quality of Tan sheep |
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| ZHAO Xingang,GUO Yanping,LIU Ming,ZHANG Can,LUO Hailing.Effect of desert steppe grazing on slaughtering performance and meat quality of Tan sheep[J].Pratacultural Science,2021,38(3):554-561. |
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| Authors: | ZHAO Xingang GUO Yanping LIU Ming ZHANG Can LUO Hailing |
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| Institution: | (State Key Laboratory of Animal Nutrition,College of Animal Science and Technology,China Agriculture University,Beijing 100193,China) |
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| Abstract: | To investigate the effect of desert steppe grazing on the Tan lamb,39 Tan lambs were randomly divided into three groups:grazing(GZ),time-limited grazing with supplement(TG),the stall-fed(SF).Then,slaughtering performance and meat quality were measured.The final body weight,carcass weight,dressing percentage,pure meat percentage,and meatbone ratio were significantly better in the SF group than in the TG group(P<0.05).Moreover,the slaughtering performance was significantly better in the TG group than in the GZ group,except for the pure meat percentage and meat-bone ratio.There were no significant differences in meat color,pH,shear force,and drip loss,but SF group was lower in cooking loss(P<0.05).The content of meat polyunsaturated fatty acids(C18?3n3,C20?5n3,C22?6n3,C18?2n6,C20?3n6,and C20?4n6)of Tan lambs in the GZ and TG groups was significantly higher than that in the SF group(P<0.05);the GZ and TG groups had a significantly lower n-6/n-3 ratio in the muscles than the SF group(P<0.05).These results suggest that grazing in the desert steppe can increase the content of unsaturated fatty acid in muscle,and have an adverse effect on cooking loss and the slaughtering performance of Tan sheep.Time-limited grazing with supplement feeding modes can improve the slaughtering performance,while preserving the fatty acid composition of Tan sheep. |
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| Keywords: | feeding modes time-limited grazing tan sheep slaughter performance cooking loss drip loss fatty acid composition |
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