不同能量水平精料对日本和牛与雷琼牛杂交牛生长性能和血浆生化指标的影响

Effects of Concentrates with Different Energy Levels on Growth Performance and Plasma Biochemical Indices in Wagyu and Leiqiong Crossbreed Cattle

本试验旨在研究不同能量水平精料对日本和牛与雷琼牛杂交牛生长性能和血浆生化指标的影响,筛选合理的日粮配方。选择15月龄的日本和牛与雷琼牛杂交F1代去势公牛42头,随机分为3组(Ⅰ、Ⅱ、Ⅲ组),对应的精料综合净能(NEmf)分别是6.43、6.90和7.50 MJ/kg,试验期为90d。试验期间,每30d测定1次体重,试验开始和结束采集血液样品进行血浆生化指标的测定。结果显示,(1)试验期Ⅰ、Ⅱ、Ⅲ组试验牛总增重分别为77.43、93.71和84.29kg,Ⅱ组增重效果明显,与Ⅰ组差异显著(P<0.05);Ⅰ、Ⅱ、Ⅲ组平均日增重分别为0.86、1.04和0.94kg/d,Ⅲ组较Ⅰ组提高9.3%(P>0.05),Ⅱ组较Ⅰ、Ⅲ组分别提高20.9%(P<0.05)、10.6%(P>0.05)。(2)试验90d后,Ⅰ、Ⅱ、Ⅲ组试验牛尿素(UREA)、总蛋白(TP)、白蛋白(ALB)水平及乳酸脱氢酶(LDH)、碱性磷酸酶(ALP)活性差异均不显著(P>0.05),但均比试验第1天高。(3)试验期Ⅰ、Ⅱ、Ⅲ组肉牛每天饲养成本分别为13.440、14.000和14.685元/头;单位增重成本分别是15.63、13.46和15.68元/头。结果提示,综合净能为6.90 MJ/kg的精料增重效果最好,育肥效益最高。

The objective of this study was to investigate the effect of concentrates with different energy levels on the growth performance and plasma biochemical indices in Wagyu×Leiqiong crossbreed cattle,and determine the optimized dietary component.42 15-month-old Wagyu×Leiqiong crossbreed bull were chosen and divided randomly into 3 groups,and cattle in groups Ⅰ,Ⅱ and Ⅲ were fed concentrates with different energy levels,of which the total net energy （NE mf ） were 6.43,6.90 and 7.50 MJ/kg,respectively.The experiment lasted for 90 days, the body weight was measured every 30 d,and blood samples were collected and plasma biochemical indices were determined at the beginning and ending of the experiment.The results showed that：①The total weight gain of groups Ⅰ,Ⅱ and Ⅲ were 77.43,93.71 and 84.29 kg during the experimental period,respectively,and that of group Ⅱ was significant higher than group Ⅰ （ P 〈0.05）.The average daily gains （ADG） were 0.86,1.04 and 0.94 kg/d,the ADG of group Ⅱ was 20.9% （ P 〈0.05）, 10.6%（ P 〉0.05） higher than that of groups Ⅰ and Ⅲ,and there was no significant between groups Ⅲ and Ⅰ （ P 〉0.05）.②At the ending of the experiment,the contents of UREA, TP,ALB,LDH and ALP of 3 groups were not significantly different （ P 〉0.05）,but they all increased compared with those at the beginning.③The daily feeding cost was 13.440,14.000 and 14.685 yuan for each cattle of groups Ⅰ,Ⅱ and Ⅲ,and the cost of unit live weight gain was 15.63,13.46 and 15.68 yuan,respectively.The above results suggested that the optimized concentrates with 6.90 MJ/kg NE mf （group Ⅱ） obtained better effect on body gain and fattening benefits.