Milk production and composition responds to dietary neutral detergent fiber and starch ratio in dairy cows

文献类型: 外文期刊

第一作者: Zhao, Meng

作者: Zhao, Meng;Bu, Dengpan;Wang, Jiaqi;Zhou, Xiaoqiao;Zhu, Dan;Zhang, Ting;Niu, Junli;Ma, Lu;Bu, Dengpan;Bu, Dengpan

作者机构:

关键词: carbohydrate composition;milk production;milk composition;NDF:starch ratio;subacute rumen acidosis

期刊名称:ANIMAL SCIENCE JOURNAL ( 影响因子:1.749; 五年影响因子:1.909 )

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页码:

收录情况: SCI

摘要: This study was designed to investigate whether dietary neutral detergent fiber (NDF):starch ratio could be considered as a nutritional indicator to evaluate carbohydrate composition and manipulate milk production and composition synthesis. Eight primiparous dairy cows were assigned to four total mixed rations with NDF : starch ratios of 0.86, 1.18, 1.63 and 2.34 from T1 to T4 in a replicated 4 x 4 Latin square design. Dry matter intake and milk production were decreased from T1 to T4. Digestibility of dry matter, organic matter, NDF and crude protein were linearly decreased from T1 to T4. As NDF : starch ratio increased, milk protein content and production, and milk lactose content and production were linearly reduced. However, milk fat content was linearly increased from T1 to T4. Quadratic effect was observed on milk fat production with the highest level in T3. Averaged rumen pH was linearly increased from T1 to T4, and subacute rumen acidosis occurred in T1. Ruminal propionate and butyrate concentration were linearly decreased, and microbial crude protein and metabolizable protein decreased from T1 to T4. It is concluded that NDF : starch ratio can be considered as a potential indicator to evaluate dietary carbohydrate composition and manipulate milk production and composition synthesis.

分类号: S8

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