| 摘要: |
| 分别用ZnCl2和ZnSO4处理豆粕、棉籽粕、菜籽粕和胡麻粕等4种饲料,用尼龙袋法测定蛋白质在瘤胃的降解率,探讨锌盐对饲料蛋白质的保护效果。结果表明,ZnCl2和ZnSO4可以降低饲料蛋白质在瘤胃的降解率,能够保护饲料蛋白质,提高过瘤胃蛋白的数量。从降解动力学分析,ZnCl2或ZnSO4降低了饲料蛋白质的快速降解部分和降解速度,从而降低了蛋白质的有效降解率。0.5% ZnCl2处理可使豆粕、棉籽粕、菜籽粕和胡麻粕蛋白质的有效降解率分别降低8.2%,3.8%,14.9%和9.8%;0.65% ZnSO4处理可使豆粕、棉籽粕、菜籽粕和胡麻粕蛋白质的有效降解率分别降低6.4%,12.6%,11.7%和15.4%。 |
| 关键词: 饲料蛋白质 蛋白质保护剂 锌盐 瘤胃 降解率 |
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| 基金项目:农业部“九五”重点攻关课题(95M02)“畜禽营养需要及调控新技术研究与开发”的部分内容 |
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| Effects of zinc-treated feedstuffs on degradability of crude protein |
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| Abstract: |
| The effects of treating soybean meal (SBM),cottonseed meal (CSM),rapeseed meal (RSM) and flax meal (FM) with zinc chloride at 0.5% of DM content,with zinc sulfate at 0.65% of DM content respectively,on CP degradability in the rumen were investigated.The trial results showed:(1) CP effective degradability was decreased by ZnCl2 or ZnSO4 treatment.With 0.5% ZnCl2 treatment,CP effective degradability was decreased by 8.2%,3.8%,14.9% and 9.8% for SBM,CSM,RSM and FM respectively.With 0.65% ZnSO4 treatment,CP effective degradability was decreased by 6.4%,12.6%,11.7% and 15.4% for SBM,CSM,RSM and FM respectively.(2) CP effective degradability was decreased by ZnCl2 or ZnSO4 treatment,which reduced immediately the degraded fraction and degradation rate. |
| Key words: feedstuff protein protein protectant zine salt rumen degradability |
