摘要
本试验旨在研究过瘤胃氨基酸和过瘤胃脂肪(RPF)对饲喂低蛋白质饲粮滩羊生长性能、消化代谢、屠宰性能及肉品质的影响。选择健康无病、体重[(22.00±1.00)kg]相近的3月龄滩羊27只,随机分成3个组,每组9只羊。对照组饲喂基础饲粮,试验Ⅰ组饲喂基础饲粮+7.5 g/d过瘤胃赖氨酸(RPLys)+4.5 g/d过瘤胃蛋氨酸(RPMet),试验Ⅱ组饲喂基础饲粮+2.4 g/d RPF,各组饲粮营养水平相近。预试期10 d,正试期60 d。结果表明:1)试验Ⅱ组滩羊终末体重显著高于其他2组(P<0.05),各组间其他生长性能指标差异不显著(P>0.05)。2)试验Ⅰ组中性洗涤纤维(NDF)表观消化率较对照组和试验Ⅱ组分别极显著提高了33.59%和51.91%(P<0.01);试验Ⅰ组酸性洗涤纤维(ADF)表观消化率最高,并显著高于试验Ⅱ组(P<0.05)。3)试验Ⅱ组胴体重、骨重、眼肌面积和骨肉比均极显著高于对照组和试验Ⅰ组(P<0.01),试验Ⅱ组净肉重和屠宰率较对照组分别显著提高了50.27%和12.33%(P<0.05)。4)试验Ⅰ组羊肉pH45 min极显著低于对照组和试验Ⅱ组(P<0.01),失水率显著低于对照组和试验Ⅱ组(P<0.05)。5)试验Ⅰ组羊肉粗蛋白质含量极显著高于试验Ⅱ组(P<0.01),粗灰分含量显著低于对照组(P<0.05)。综上所述,在低蛋白质饲粮条件下,添加RPLys和RPMet能够提高滩羊NDF和ADF表观消化率,而添加RPF能够改善滩羊屠宰性能。
This experiment was conducted to investigate the effects of rumen protected amino acids and rumen protected fat(RPF)on growth performance,digestion and metabolism,slaughter performance and meat quality of Tan sheep fed a low protein diet.Twenty-seven healthy Tan sheep of 3-month-old with similar body weight of(22.00±1.00)kg were randomly divided into 3 groups with 9 sheep in each group.Sheep in the control group were fed a basal diet,those in trial groupⅠwere fed the basal diet+7.5 g/d rumen protected lysine(RPLys)+4.5 g/d rumen protected methionine(RPMet),and those in trial groupⅡwere fed the basal diet+2.4 g/d RPF,with similar nutrient levels in each group.The pre-test lasted for 10 days and the trial lasted for 60 days.The results showed as follows:1)the final body weight of Tan sheep in trial groupⅡwas significantly higher than that in the other two groups(P<0.05),but there were no significant differences in the other growth performance indices among all groups(P>0.05).2)The neutral detergent fiber(NDF)apparent digestibility in trial groupⅠwas extremely significantly increased by 33.59%and 51.91%compared with that in the control group and trial groupⅡ(P<0.01),respectively;the acid detergent fiber(ADF)apparent digestibility in trial groupⅠwas the highest,and significantly higher than that in trial groupⅡ(P<0.05).3)The carcass weight,bone weight,loin eye area and bone to meat ratio in trial groupⅡwere extremely significantly higher than those in the control group and trial groupⅠ(P<0.01),and the net meat weight and dressing percentage in trial groupⅡwere significantly increased by 50.27%and 12.33%compared with the control group,respectively(P<0.05).4)The pH45 minof mutton in trial groupⅠwas extremely significantly lower than that in the control group and trial groupⅡ(P<0.01),and the water loss rate was significantly lower than that in the control group and trial groupⅡ(P<0.05).5)The crude protein content of mutton in trial groupⅠwas extremely significantly higher than that in trial groupⅡ(P<0.01),and the crude ash content in trial groupⅠwas significantly lower than that in the control group(P<0.05).In conclusion,the supplementation of RPLys and RPMet can improve the apparent digestibilities of NDF and ADF of Tan sheep fed a low protein diet,while the RPF supplementation can improve the slaughter performance.
作者
李庆敏
周玉香
温红瑞
马步仓
沈露
LI Qingmin;ZHOU Yuxiang;WEN Hongrui;MA Bucang;SHEN Lu(Agricultural College of Ningxia University,Yinchuan 750021,China)
出处
《动物营养学报》
CAS
CSCD
北大核心
2023年第2期1046-1056,共11页
CHINESE JOURNAL OF ANIMAL NUTRITION
基金
宁夏自然科学基金项目(2022AAC03125)。
关键词
过瘤胃氨基酸
过瘤胃脂肪
低蛋白质饲粮
滩羊
生长性能
消化代谢
屠宰性能
rumen protected amino acids
rumen protected fat
low protein diet
Tan sheep
growth performance
digestion and metabolism
slaughter performance
