探索将RNA/DNA比率作为评定猪生长性能和饲料营养价值指标的可行性.选用了目前云南省4个杂交组合(PIC402×LY、PIC402×滇陆猪N1、D×LY、Y×滇陆猪N1)32头断奶仔猪,按品种分为4个组,每组设2个重复,每个重复4头猪.每组分两个饲养阶段(20～60 kg,60～100 kg),日粮及饲养管理方式一致.试验结束后屠宰,采集其背最长肌,测定RNA/DNA浓度比.结果表明:20～60 kg阶段,猪肌肉RNA/DNA与其增重和采食量之间的相关性不显著(P＞0.05),但与料重比有较显著的相关性(P＜0.05),相关系数R均在0.85以上.60～100 kg阶段,猪肌肉的RNA/DNA与猪的增重、采食量和料重比之间的有一定相关性,但都不显著(P＞0.05).在20～100 kg阶段,猪肌肉的RNA/DNA与猪的增重和采食量之间的呈一定的相关性(P＞0.05),但于其料重比之间相关性,相关系数在0.65以上.结论提示,猪肌肉RNA/DNA比率与猪增重及采食量、饲料转化效率有正相关,RNA/DNA比率越大,其增重及采食量越大,料重比越小；而且猪肌肉RNA/DNA比率有品种特异性,不同品种猪肌肉中的RNA/DNA比率值也不同.%The study aims at exploring the feasibility of evaluating the growth performance of swines and the feed nutrient indexes by RNA/DNA ratio. 32 piglets were selected from four combinations (PIC402 XLYsPIC402XNl,DXLY,YXNl)and randomly assigned to 4 treatments with 2 replicates and 4 piglets each replicate. The test was conducted in two steps(20～60 kg,60～100 kg). After the trial,the pigs were slaughtered. The results showed that RNA/DNA ratio had a correlation with its weight gain and feed intake at 20~60 kg stage(P>0. 05), but RNA/DNA ratio between each group and F/G ratio were of significant correlation (P<0. 05) .RNA/DNA ratio and pig weight gain, feed intake and F/G ratio had a certain relevance at the 60~100 kg stage,(P>0. 05). RNA / DNA ratio and pig weight gain and feed intake was somewhat correlated(P>0. 05) , but the correlation coefficients of their F/G ratio was above 0. 650 in the 20～100 kg stage. It could be concluded that RNA/DNA ratio had a positive correlation with the weight of growing pigs. The higher RNA/DNA ratio, the more body weight gain and feed intake, the smaller the F/ G ratio is. In addition, the RNA/DNA ration in muscle is of breed specificity,which shows differently in different breeds.
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