文献类型：期刊文献

英文题名：Effect of Zinc Source on Performance, Zinc Status, Immune Response, and Rumen Fermentation of Lactating Cows

作者：Wang, Run L.[1,2];Liang, Jian G.[1];Lu, Lin[1];Zhang, Li Y.[1];Li, Su F.[1,3];Luo, Xu G.[1]

机构：[1]Chinese Acad Agr Sci, Inst Anim Sci, Mineral Nutr Res Div, Beijing 100193, Peoples R China;[2]Guangdong Ocean Univ, Dept Anim Sci, Zhanjiang 524088, Peoples R China;[3]Hebei Normal Univ Sci & Technol, Dept Anim Sci, Qinhuangdao 066000, Peoples R China

年份：2013

卷号：152

期号：1

起止页码：16

外文期刊名：BIOLOGICAL TRACE ELEMENT RESEARCH

收录：SCI-EXPANDED(收录号：WOS:000316010300003)、、Scopus(收录号：2-s2.0-84874938955)、WOS

基金：This study was supported by the special foundation of the Chinese Academy of Agricultural Sciences (CAAS) for the first-place distinguished scientists (Beijing, People's Republic of China), the Research Program of the State Key Laboratory of Animal Nutrition (project no. 2004DA125184G1108; Beijing, People's Republic of China), and the Program of the National Natural Science Foundation of China (project no. 30871798; Beijing, People's Republic of China).

语种：英文

外文关键词：Lactating cow; Zinc source; Milk production; Immune response; Rumen fermentation

外文摘要：Two experiments were conducted to examine the effect of zinc (Zn) source on the performance, Zn status, immune response, and rumen fermentation of lactating cows to find the most available Zn source for dairy production. In Experiment 1, a total of 30 multiparous Holstein cows were randomly allocated by body weight and milk yield to one of five treatments in a completely randomized design. Cows were fed a total mixed ration (TMR) with no Zn addition (containing 37.60 mg Zn/kg TMR by analysis), and the basal TMR supplemented with 40 mg Zn/kg TMR from either Zn sulfate or one of three organic Zn chelates with weak (Zn-AA W), moderate (Zn-Pro M), or strong (Zn-Pro S) chelation strengths, respectively for 55 days. In Experiment 2, the in vitro rumen fermentation method was used in a completely randomized design involving a 4 x 3 factorial arrangement of treatments. The four Zn sources were the same as those used in Experiment 1, and the three supplemental Zn levels in the rumen fluid were 0, 10, and 20 mu g/mL, respectively. The feed intake, milk composition, and somatic cell count (SCC) were unaffected (P > 0.05) by treatments. However, the milk yield was increased (P < 0.05) by addition of Zn from both the Zn-AA W and Zn-Pro S. Plasma Zn level at the end of the experiment was increased (P < 0.05) by addition of Zn from all three organic sources. Serum antibody titers on day 21 after vaccination with foot and mouth disease (FMD) vaccine were increased (P < 0.05) by both supplemental Zn-AA W and Zn-Pro S. The organic Zn sources with different chelation strengths supplemented at the added Zn level of 10 mu g/mL were more effective (P < 0.05) in improving the rumen fermentation than Zn sulfate, with the most effective being Zn-AA W. In conclusion, Zn source had no influence on the feed intake, milk composition, and SCC; however, both the Zn-AA W and Zn-Pro S were more effective than Zn-Pro M and Zn sulfate in enhancing the rumen fermentation, Zn status, and humoral immune response as well as improving milk yield of lactating cows. The improved milk production might be attributed to the improved rumen fermentation, Zn status, and immune function.