摘要
【目的】试验旨在研究饲粮营养水平对多浪羊生长性能、体尺性状、屠宰性能、肉品质、血清生化指标及瘤胃发酵参数的影响,为多浪羊的科学饲养提供参考。【方法】选择体重相近的3~4月龄多浪羊公羊18只,随机分为3组,每组6个重复,每个重复1只羊。饲粮Ⅰ、Ⅱ、Ⅲ组羊分别饲喂精粗比为35∶65、50∶50和65∶35的全混合饲粮。试验期74 d,其中预试期14 d,正试期60 d。于第60天晨饲前对羊进行称重、测量体尺并颈静脉采血,屠宰后采集瘤胃内容物并测定屠宰性能和肉品质。【结果】(1)与饲粮Ⅰ相比,饲粮Ⅲ能够显著提高羊平均日增重和胸围(P<0.05)。(2)与饲粮Ⅰ相比,饲粮Ⅱ能够显著提高羊屠宰率(P<0.05),饲粮Ⅲ能够极显著提高羊胴体重、屠宰率和肝脏重(P<0.01)。(3)与饲粮Ⅱ相比,饲粮Ⅰ能够极显著或显著提高羊背最长肌a^(*)_(24 h)、pH_(24 h)及滴水损失率,以及羊股二头肌pH_(45 min)和pH_(24 h)(P<0.01;P<0.05);饲粮Ⅲ能够极显著或显著提高羊背最长肌a^(*)_(24 h)和b^(*)_(24 h)(P<0.01;P<0.05)。与饲粮Ⅲ相比,饲粮Ⅰ能够极显著或显著提高羊股二头肌L^(*)_(24 h)和b^(*)_(45 min)(P<0.01;P<0.05)。(4)与饲粮Ⅱ相比,饲粮Ⅲ能够显著提高羊瘤胃中血清中尿素氮含量(P<0.05)。(5)与饲粮Ⅰ相比,饲粮Ⅲ能够极显著或显著提高羊瘤胃中戊酸、乳酸、异丁酸和异戊酸含量(P<0.01;P<0.05),显著降低乙丙比(P<0.05),饲粮Ⅱ和Ⅲ均能够显著提高羊瘤胃中氨态氮含量(P<0.05)。【结论】饲喂精粗比为65∶35饲粮可以提高多浪羊生长性能和屠宰性能,改善肉品质,促进肝脏发育,改变瘤胃发酵类型,增加总挥发性脂肪酸含量。
【Objective】The aim of this experiment was to study the effects of dietary nutrient levels on the growth performance,body measurement traits,slaughter performance,meat quality,serum biochemical indices and rumen fermentation parameters of Duolang sheep,so as to provide an important reference for the scientific feeding of sheep.【Method】Eighteen healthy,3-4 month old Duolang sheep with similar body weight were randomly divided into 3 groups with 6 replicates per group and 1 sheep per replicate.The concentrate-to-roughage ratio of the dietsⅠ,ⅡandⅢwere 35∶65,50∶50 and 65∶35,respectively.The experiment period lasted for 74 days,including 14 days of adaption period and 60 days of formal period.Sheep were weighed,measured body size and collected blood from the jugular vein at the 60th days before morning feeding.After slaughter,rumen contents were collected,the slaughter performance and meat quality were determined.【Result】①Compared with dietⅠ,dietⅢcould significantly increase the average daily gain and chest circumference of sheep(P<0.05).②Compared with dietⅠ,dietⅡcould significantly increase the dressing percentage of sheep(P<0.05),and dietⅢcould extremely significantly increase the carcass weight,dressing percentage and liver weight of sheep(P<0.01).③Compared with dietⅡ,dietⅠcould extremely significantly or significantly increase a^(*)_(24 h),pH_(24 h) and dripping loss rate of longissimus dorsi muscle in sheep(P<0.01 or P<0.05),and extremely significantly or significantly increase pH 45 min and pH_(24 h) of biceps femoris muscle in sheep(P<0.01 or P<0.05).DietⅢcould extremely significantly or significantly increase a^(*)_(24 h) and b^(*)_(24 h) of longissimus dorsi muscle in sheep(P<0.01 or P<0.05).Compared with dietⅡ,dietⅠcould extremely significantly or significantly increase L^(*)_(24 h) and b^(*)_(45 min) of biceps femoris muscle in sheep(P<0.01 or P<0.05).④Compared with dietⅡ,dietⅢcould significantly increase the urea nitrogen of serum in sheep(P<0.05).⑤Compared with dietⅠ,dietⅢcould extremely significantly or significantly increase the contents of ruminal valerate,lactic acid,isobutyrate and isovalerate of sheep(P<0.01 or P<0.05),significantly decrease A/P(P<0.05),and dietsⅡandⅢcould significantly increase the ammonia nitrogen level(P<0.05).【Conclusion】In conclusion,fed total mixed ration with a concentrate-to-roughage ratio of 65∶35 diet could improve the growth performance,slaughter performance and meat quality,promote liver development,change rumen fermentation type,and increase the content of total volatile fatty acid in Duolang sheep.
作者
靳亚星
李璇玥
李千一
艾丽菲热·色提瓦力迪
穆扎帕尔·吾买尔
陈勇
JIN Yaxing;LI Xuanyue;LI Qianyi;Ailifeire Setiwalidi;Muzhapaer Wumaier;CHEN Yong(Xinjiang Key Laboratory of Herbivore Nutrition for Meat&Milk,College of Animal Sciences,Xinjiang Agricultural University,Urumqi 830052,China)
出处
《中国畜牧兽医》
CAS
CSCD
北大核心
2024年第10期4343-4351,共9页
China Animal Husbandry & Veterinary Medicine
基金
自治区科技创新领军人才项目(2022TSYCLJ0014)
自治区重点研发计划项目(2023B02015-3)
自治区畜牧产业技术体系(XJARS-XM-08)。
关键词
多浪羊
营养水平
生长性能
屠宰性能
肉品质
血清生化指标
瘤胃发酵参数
Duolang sheep
nutrient levels
growth performance
slaughter performance
meat quality
serum biochemical indices
rumen fermentation parameters
