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Short communication: Effects of replacing part of corn silage and alfalfa hay with Leymus chinensis hay on milk production and composition

文献类型： 外文期刊

作者： Yan, R. 1 ; Chen, S. 2 ; Zhang, Xian 3 ; Han, J. 1 ; Zhang, Y. 1 ; Undersander, D. 2 ;

作者机构： 1.Chinese Acad Agr Sci, Coll Anim Sci & Technol, Dept Grassland Sci, Beijing 100193, Peoples R China

2.Univ Wisconsin, Dept Agron, Madison, WI 53706 USA

3.Zhejiang Acad Agr Sci, Inst Environm Resource Soil & Fertilizer, Hangzhou 310021, Zhejiang, Peoples R China

关键词： linoleic acid: 60-33-3;lactose: 63-42-3;neutral detergent fiber;milk protein;milk fat;milk production;corn silage: animal feed;milk composition;alfalfa hay: animal feed;milk quality;dry matter intake;cell count;Leymus hay: animal feed

期刊名称：JOURNAL OF DAIRY SCIENCE （ 影响因子：4.034； 五年影响因子：4.354 ）

ISSN：

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收录情况： SCI

摘要： The objective of this research was to investigate the effects of replacing part of corn silage (CS) and alfalfa hay (AH) with Leymus chinensis hay on milk production and composition. Twenty multiparous Holstein dairy cows were used in a randomized block design for a 14-week period and 2 treatments. Treatments were (dry matter basis): (1) Non-Leymus chinensis hay diet (NLC; 35% CS, 15% AH) and (2) added Leymus chinensis hay diet (ALC; 30% CS, 10% AH, 10% Leymus chinensis hay). Adding Leymus chinensis hay increased neutral detergent fiber content and in vitro digestibility of the diet. Cows receiving the ALC diet had higher dry matter intake, milk yield, milk protein yield, lactose yield, solids-not-fat yield, and milk fat content compared with those fed the NLC diet. Somatic cell counts of cows decreased in the ALC compared with the NLC treatment. Cis-11 18:1 and 18:2 contents in milk increased, whereas trans-9 and cis-9 18:1 fatty acid contents decreased. Trans-9, cis-11 conjugated linoleic acid content was not influenced by adding Leymus chinensis hay to the diet. Leymus chinensis hay can be used to replace part of CS and AH in diets of dairy cows to get higher milk yield and good milk quality.

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