猪生长激素对肉猪增重及瘦肉率的影响

THE EFFECT OF PORCINE SOMATOTROPIN(PST) ON SWINE PERFORMANCE

本文研究肉猪饲以营养水准价值高的饲粮时,猪生长激素(PST)对猪生长后期的影响。选用杜洛克×长白×约克夏三元杂交猪,长白×本地大花白×长白杂交猪(即长白级进二代)及长白×本地大花白杂交猪共240头进行试验,每天每头试验猪颈部肌肉注射PST 2、4或6 mg,连续给药70天。停药7天后进行屠宰,测定的参数是净增重、料肉比和胴体品质性状等。所得数据用方差分析方法进行生统处理,本试验的研究结果表明,PST能显著增加三种杂交猪的瘦肉率、瘦肉肥肉比与眼肌面积,使膘厚变薄、料肉比减小,在养猪业中具有应用价值。

The effect of PST on finishing pig performance when fed a high nutrient level diet was investigated in 240 crossbred pigs(120 barrows and 120 gilts).The breeds of pigs were Duroc X Landrace X Yorkshire(n=48,group Ⅰ),Landrace X Chinese Large Black and White X Landrace(n=96,gorup Ⅱ)and Landrace X Chinese Large Black and White(n = 96,group Ⅲ).All PST treatments were administered(2,4 or 6 mg/per pig/per day)intramuscularly..The duration of administration was 70 days.The time of withdrawal was 7 days before slaughter.The performance parameters were net gain,ratio of feed to lireweight(feed utilization)and carcass characteristics.The data were statistically analyzed by analysis of variance.The results showed that PST could significantly increase longissimus muscle area,lean meat percentage and lean-to-fat ratio,and decrease backfat thickness,and ratio of feed to liveweight after PST was administered,the lean meat in group Ⅰ,group Ⅱ and group Ⅲ increased by 2.65%,8.27---11.08% and 5.06-7.18%,respectively.It is of practical value in pork production.