不同精粗比饲粮对青海黑藏羊生长发育、血清生化及其相关激素含量的影响

Effects of Different Forage to Concentrate Ratio Diets on Growth and Development, Serum Biochemistry and Related Hormone Contents of Qinghai Black Tibetan Sheep

【目的】研究不同精粗比饲粮对育肥期黑藏羊生长性能、屠宰性能、血清生化及相关激素含量的影响。【方法】采用单因素随机区组设计,将60只体况良好且体重相近(10.45±0.96)kg的2月龄早期断奶黑藏羊公羔随机分为3组,每组20只,分别饲喂精粗比为70∶30(HC组)、50∶50(MC组)和30∶70(LC组)的全混合饲粮。试验分为预饲期8 d,正试期120 d。【结果】(1) HC组平均日增重(average daily gain,ADG)显著大于其他2组(P<0.05);而料重比(feed/gain,F/G)则相反(P<0.05)。(2)HC组体高、胸围、体斜长、宰前活重、胴体重和屠宰率均大于LC组(P<0.05),较MC组差异不显著(P>0.05);HC组眼肌面积显著大于其他2组(P<0.05)。(3)HC组葡萄糖(glucose,GLU)和生长激素(growth hormone,GH)含量高于LC组(P<0.05)和MC组(P>0.05),而HC组甘油三酯(total triglycerides,TG)、瘦素(leptin,LEP)含量显著低于LC组(P<0.05)。【结论】在试验条件下,饲喂精粗比为70∶30全混合饲粮时,黑藏羊能够获得最佳的生长发育,且血液生化指标和相关激素含量均在正常范围内。

【Objective】This experiment was conducted to investigate the effects of different concentrate to forage ratio diets on growth performance,slaughter performance and serum biochemical indices of black Tibetan sheep. 【Method】The single-factor random block designwasused in this study. sixty 2-month-old black Tibetan male lambs with similar body weight(10.45±0.96) kg were randomly divided into3 groups with 20 sheep per group. The lambs were fed a total mixed diet with concentrate to forage ratio of 70∶30(HC group),50∶50(MC group) and 30∶70(LC group),respectively. The trial period was included into pre-feeding period(8 days) and formal trial period(120 days).【Result】(1) Average daily gain(ADG) in group H was significantly higher than that in other groups(P<0.05),whereas feed/gain(F/G) was the opposite(P<0.05).(2) Body height,chest circumference,body length,live weight before slaughter,carcass weight and slaughter percentage in group HC were significantly higher than those in group LC(P<0.05),no significant difference compared with MC group(P >0.05),and eye muscle area in group HC was significantly higher than that in the other two groups(P<0.05).(3) The contents of glucose(GLU) and growth hormone(GH) in group HC were higher than those in group LC(P<0.05) and group MC(P>0.05). The contents of total triglycerides(TG) and leptin(LEP) in group H were lower than those in group LC(P<0.05).【Conclusion】The mixed diet with concentrate to forage ratio of 70∶30 has better growth performance for black Tibetan sheep,and both blood biochemical indexes and related hormone contents are within the normal range.