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不同蛋白质水平补饲料对早期断奶犊牦牛生产性能和胃肠道发育的影响

DOI: 10.3969/j.issn.1006-267x.2015.03.032

Keywords: 母犊牦牛,补饲料,蛋白质水平,生产性能,胃肠道发育

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Abstract:

本试验旨在探究不同蛋白质水平补饲料对3月龄早期断奶犊牦牛生产性能、血液指标和胃肠道发育的影响。选取3月龄(90±5)日龄]健康大通母犊牦牛48头,随机分为4组,每组4个重复,每个重复3头。对照组犊牛全放牧,试验组犊牛在放牧基础上分别补饲不同蛋白质水平(粗蛋白质水平分别17%、18%、19%)的3种等能量(增重净能5.6MJ/kg)饲粮。预试期7d,正试期60d。结果表明:1)与对照组相比,补饲能够显著提高犊牦牛的平均日增重,17%、18%和19%补饲组分别提高了28.87%、47.47%和28.61%(P<0.05)。2)与对照组相比,补饲显著提高了血清尿素氮浓度(P<0.05),17%、18%和19%补饲组分别增加了10.57%、16.64%、21.84%(P<0.05)。3)与对照组组相比,补饲料粗蛋白质水平为18%时,显著提高了瘤胃和大肠的绝对重量和相对重量(P<0.05),显著提高了十二指肠、盲肠、结肠的绒毛高度以及十二指肠和盲肠的绒毛高度/隐窝深度(P<0.05)。因此,补饲能够提高早期断奶母犊牦牛生产性能和促进胃肠道发育,早期断奶母犊牦牛的补饲料的适宜粗蛋白质水为18%。

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