The study was undertaken to investigate the effect of different feeding conditions on MyomiRs expression in longissimus dorsi and slaughter performance of 12-month-old Sunit sheep.The results showed that growth traits (length,height and chest girth),live weight and carcass weight of sheep in the grazing group were significantly higher than those of sheep in the stall-fed group (P ＜ 0.05),and dressing percentage and lean meat yield of pen-fed sheep were higher than those of grazing sheep.The level of miRNA expression in longissimus dorsi of grazing sheep was higher than in stall-fed sheep.The miR-1 expression in grazing sheep had a significant positive correlation with height,carcass weight and lean meat yield (P ＜ 0.05),and miR-133 expression was also significantly positively correlated with lean meat yield (P ＜ 0.05).But a significant negative correlation between miR-128 expression and lean meat yield was noted for the stall-fed group (P ＜ 0.05).Accordingly,different feeding conditions have an impact on miRNAs expression,thereby further affecting slaughter performance.%选择不同饲养条件下12月龄苏尼特羊的背最长肌为实验材料,通过测定6种miRNAs的表达量及苏尼特羊的屠宰性能,研究不同饲养条件对miRNAs表达量及屠宰性能的影响.结果表明:放牧苏尼特羊生长性状(体长、体高、胸围)、宰前活质量、胴体质量均显著高于圈养(P＜0.05),圈养苏尼特羊屠宰率、净肉率高于放牧.放牧苏尼特羊miRNAs表达量均高于圈养苏尼特羊.放牧苏尼特羊miR-1表达量与体高、胴体质量、净肉质量、净肉率显著正相关(P＜0.05),miR-133表达量与净肉质量呈显著正相关性(P＜0.05),圈养苏尼特羊miR-128表达量与净肉率显著负相关(P＜0.05).说明不同饲养条件对miRNAs的表达有影响,进一步影响屠宰性能.
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