摘要
随机选取14头秦川牛(其中1.5岁的公、母牛各4头,2.0岁的公、母牛各3头),按性别分为两组。采用放射免疫法测定血液中生长激素(GH)、胰岛素(INS)的水平,并对每头牛的体高、体斜长、胸围、胸深、尻宽、腰角宽等体尺指标及体重进行测量并分析,结果表明:在1.5时公、母秦川牛体内的生长激素和胰岛素差异不显著(P>0.05);而在2.0岁时公、母秦川牛体内的生长激素和胰岛素差异显著(P<0.05);并且随着年龄的增加,秦川牛体内的生长激素呈下降趋势而胰岛素则呈增加趋势,且生长激素和胰岛素呈差异不显著的负相关(P>0.05)。通过对体尺指数进行分析得出:较1.5岁而言,2.0岁秦川牛体躯发育程度更大,胸围更宽,尻部增幅明显,骨骼等体躯部分生长速度相对减慢,而肌肉等体量部分增长速度则相对加快,符合肉牛的生长发育规律以及秦川牛中、晚熟的特点。将实测体重与经济性能划分标准比较,发现秦川牛仍属于役肉兼用型品种,但经过近几年的选育,体重有了很大的增加。
We selected 14 QinChuan cattles at random(1.5 year old female and male cattle 4 respectively; 2.0 year old female and male cattle 3 respectively).According to sex, we divided them into two groups. Then we measured their body length, height at wither, breast depth, breast circumstance, hip with and weight, and analysis them.The results showed that at 1.5 years old, the hormone level of GH and INS appears difference unremarkably(p>0.05). At 2.0 years old, the hormone level of GH and INS appear difference remarkably(p<0.05). And with the age growing, the GH level appear to descend while INS level appear to ascend. INS and GH level present negative correlation clearly (p>0.05). Analyzing the body composition index, we discovery at 2.0 year old QinChuan Cattle'breast circumstance is wider, hip grows clearly, body growth rate is relatively slow.But growth rate of muscle is relatively quick. It corresponds with the meat cattle growth rules and middle maturity or late maturity characters of Qinchuan Cattle. Comparing the actual weight with partition standard of economic performance, we discovery Qinchuan Catttle still belongs to beef and farm breed. But with present selecting and cultivating present years, Qinchuan Cattles'weights add greatly.
出处
《中国农学通报》
CSCD
2004年第5期9-11,共3页
Chinese Agricultural Science Bulletin
基金
国家农业科技成果转化资金项目"秦川牛肉用新品系快速繁育"(02EFN216100595)
陕西省科技攻关计划"秦川肉牛产业化开发"项目(2002K04-G9)。
