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断母乳日龄对犊牛营养物质消化和血清生化指标的影响

DOI: 10.3969/j.issn.1006-267x.2015.02.013

Keywords: 红安格斯肉牛,断奶,代乳品,营养物质消化率,血清指标

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Abstract:

本试验旨在研究不同断母乳日龄对犊牛营养物质消化和血清生化指标影响.试验选用新生红安格斯与西门塔尔杂交肉犊牛60头,根据日龄和体重随机分成5个处理,每个处理12头犊牛,公母各占1/2,试验组分别在28、42、56和70日龄进行断母乳(分别为28A、42B、56C、70D组),随后人工哺乳代乳品至90日龄;对照组(CK组)随母哺乳至150日龄.试验时间为出生至150日龄,期间测定体重(0、70、90、150日龄)和血清生化指标(70、90、150日龄)的变化.每个处理选取6头犊牛分别在断奶前(85~90日龄)和断奶后(145~150日龄)进行2期消化代谢试验.每期6d,其中2d预试期,4d正试期.结果显示:1)试验全期体重各组间无显著差异(P>0.05).2)断奶前各组犊牛营养物质消化率差异不显著(P>0.05),断奶后28A、42B组犊牛干物质消化率显著高于56C、70D组(P<0.05),有机物消化率显著高于70D组(P<0.05),其中42B组消化率略高.3)150日龄试验结束时,28A和42B组血清葡萄糖、总蛋白、甘油三酯、尿素氮、胆固醇、结合珠蛋白、白细胞介素-2、胰岛素样生长因子-1、免疫球蛋白M含量与CK组相比差异不显著(P>0.05),血清免疫球蛋白G、免疫球蛋白A含量分别显著低于、高于CK组(P<0.05),其中42B组略高.由此可见,红安格斯与西门塔尔杂交肉犊牛的断母乳时间以42日龄较为适宜.

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