延边黄牛公牛与阉牛产肉性能的比较

为研究延边黄牛公牛和阉牛产肉性能，选择品种相同、年龄体重相近、生长发育正常的延边黄牛肉牛16头，随机分成2组，每组8头，其中试验组为阉牛，对照组为公牛，育肥373d．结果表明：21月龄时，公牛组和阉牛组平均体重分别为468．63和448．88k，差异显著（P〈0．01）；公牛组和阉牛组的末重分别为542．38和488．63kg，差异极显著（P〈0．01）；公牛组和阉牛组平均日增重分别为0．71和0．57kg，公牛组的平均日增重比阉牛组提高25．4％，差异极显著（P〈0．01）．阉牛组牛肉的外观肉色呈亮红色，属较理想肉色，公牛组牛肉颜色红色稍暗，差异显著（P〈O．05）；阉牛组牛肉脂肪颜色为白色，公牛组白色稍黄，差异不显著（P〉0．05）；大理石状花纹阉牛组优于公牛组．肌内脂肪含量阉牛组比公牛组高23．04％，差异显著（P〈0．05），粗蛋白含量公牛组比阉牛组高4．41％，差异显著（P〈0．05），粗灰分含量则差异不显著．

Comparison on beef performance of Yanbian Yellow cottle and Steers

To research the effect of beef production performance of Yanbian Yellow Cattle, selected 16 healthy cattles from same breed group with similar age and weight as trail animals, divided into two groups randomly,8 cattles for every group. One was steer group and the other was bull group. Feeding for 373 d to observe the effect on body weight increasing and beef profile. The results showed that at age of the 21st month, the average weight of bulls and steers was 468.63 and 448.88 kg, the difference was notable （P〈0.05） ;the end weight of bulls and steers was 542.38 and 488.63 kg, the difference was extremely notable（P〈0.01） ; and average daily weight of bulls and steers was 0.71 and 0.57 kg, the difference was extremely notable（P〈0.01）. The apparent beef color of steer group is light red, and bull group is red but a bit dull,difference is significant（P〈0.05）; the fat color of steer beef is white,but bull group is white and a bit yellow,difference is significant（P〈0.05）; the marble in steer group is prior to bull steer; the content of intramuscularly fat in steer group is 23.04 %, higher than that in bull group, the difference is significant （P〈0.05）; the content of crude proteinum in bull group is 4.41% ,higher than steer group,difference is significant （P〈0.05）, there is no significant difference in crude ashes content between two groups.