摘要
７０头“社长大”肥育猪始重（５８±ｌ．０）ｋｇ，按饲养试验要求分成５组，饲喂Ｃｌｅｎｂｕｔｅｒｏｌ含量（ｍｇ／ｋｇ）分别为５，１０，１５，２０的饲粮至猪体重９０ｋｇ左右时结束。结果表明：①饲粮中添加Ｃｌｅｎｂｕｔｅｒｏｌ能提高日增重、降低料重比。其中以１５ｍｇ／ｋｇ组效果最佳，日增重提高１５％（Ｐ＜０．０２），料重比下降１０％；②不同添加量的Ｃｌｅｎｂｕｔｅｒｏｌ均提高了猪胴体瘦肉率。其中１５ｍｇ／ｋｇ组瘦肉率升高５％（Ｐ＜０．０５），胴体脂肪比率则降低１５％（Ｐ＜０．０５），而且Ｃｌｅｎｂｕｔｅｒｏｌ对猪胴体组成的。影响存在部位间的差异，对前躯作用最明显；③提高瘦肉率的同时，Ｃｌｅｎｂｕｔｅｒｏｌ还使眼肌中的营养组成发生变化，蛋白质含量升高４．５％（Ｐ＜０．０５），脂肪含量降低３０％（Ｐ＜０．０５）。
Seventy finishing pigs(Duroc X Landrace X Yorkshire)were used to study the effects of five levels of dietary clenbuteroI CL(mg/kg):0,5,10,15 and 20 on performance,carcass charac-teristics and meat quality over the live weight range from 58 to 90 kg.The results showed that clenbuterol improved average daily gain (ADG)and decreased feed gain ratio (F/G).Among the levels, 15 mg/kg clenbuterol was the best,which increased ADG by l5%(P<0.02),decreased F/G by 10%。It also had the best efficiency in increasing carcass lean rate, which increased carcass lean rate by 5%(P<0. 05)and decreased carcass fat rate by 15%(P<0. 05).Furthermore,as to carcass lean rate,clenbuterol had better function in forequarter than in other parts. At the same time,clenbuterol decreased the content of fat by 30%(P<0. 05)and increased the content of pro-tein by 4.5%(P<0. 05)in longissimus dorsi.
基金
国家科委"八五"攻关项目
