不同蛋白质水平日粮对6~12月龄新疆褐牛生长发育的影响

Effects of Diets with Different Protein Levels on the Growth and Development of Xinjiang Brown Cattle aged 6-12 months

研究不同蛋白质水平的全混合日粮对新疆褐牛生长发育的影响,为科学配比新疆褐牛日粮提供参考。选取体型、体重相近((154.15±20.17)kg)、健康无病的6月龄育成期新疆褐牛24头,分为对照组与试验组,每组为12头,公母各半。对照组日粮中豆粕与乳清蛋白比例分别为8.30%、0%,试验组日粮中豆粕与乳清蛋白比例分别为3.30%、5.00%,形成高蛋白质水平日粮,其他日粮原料组成相同,2个组的饲养管理条件一致,饲喂试验时间为180 d,研究全混合日粮中不同蛋白质水平对6~12月龄新疆褐牛体重、体尺的影响。结果显示,试验组的总增重及平均日增重显著高于对照组,分别提高了28.66%和28.57%(P<0.05)。体尺方面,经过180 d饲养,试验组体高、体斜长、胸围分别提高了66.40%、22.05%、14.79%(P<0.05)。由此可知,不同日粮蛋白质水平对6~12月龄新疆褐牛的生长发育有显著影响,新疆褐牛日粮中蛋白质水平在25.20%的情况下,其生长发育状况良好。

The purpose of this experiment is to study the effects of full mixed diets with different protein levels on the growth and development of Xinjiang brown cattle,so as to provide reference for the scientific ration of Xinjiang brown cattle.In this experiment,24 Xinjiang Brown Cattle with similar body shape and weight((154.15±20.17)kg)and healthy and disease-free 6-month-old were selected.They were divided into control group and experimental group,with 12 in each group,half male and half female.The ratio of soybean meal to whey protein in the diet of the control group was 8.30%and 0%respectively,and the ratio of soybean meal to whey protein in the diet of the experimental group was 3.30%and 5.00%respectively,forming a high protein level diet.The composition of other dietary raw materials was the same,the feeding and management conditions of the two groups were the same,and the feeding test time was 180 days.The effects of different protein levels in the full mixed diet on the body weight and body size of 6-12 month old Xinjiang brown cattle were studied.The results showed that the total weight gain and average daily gain of the experimental group were significantly higher than those of the control group,increased by 28.66%and 28.57%respectively(P<0.05).In terms of body size,after 180 days of feeding,it could be seen from the indexes of body height,body length and chest circumference that the experimental group increased by 66.40%,22.05%and 14.79%respectively(P<0.05).It could be seen from the test results that different dietary protein levels had a significant impact on the growth and development of 6-12 month old Xinjiang brown cattle.When the dietary protein level of Xinjiang brown cattle was 25.20%,its growth and development was better.