文献类型：期刊文献

英文题名：Effects of dietary zinc on performance, nutrient digestibility and plasma zinc status in Cashmere goats

作者：Jia, Wenbin[1];Jia, Zhihai[1];Zhang, Wei[1];Wang, Runlian[2];Zhang, Shiwei[3];Zhu, Xiaoping[1]

机构：[1]China Agr Univ, Coll Anim Sci & Technol, Beijing 100193, Peoples R China;[2]Guangdong Ocean Univ, Dept Anim Sci, Zhanjiang 100037, Peoples R China;[3]Liaoning Cashmere Goats Breeding Ctr, Liaoyang 111001, Peoples R China

年份：2008

卷号：80

期号：1-3

起止页码：68

外文期刊名：SMALL RUMINANT RESEARCH

收录：SCI-EXPANDED(收录号：WOS:000262077400012)、、Scopus(收录号：2-s2.0-56949107645)、WOS

基金：This work was supported in part by the grant from National Key Technologies R & D Program (No. 2006BAD14B07 and 2006BAD01A11).

语种：英文

外文关键词：Zinc; Performance; Nutrient digestibility; Plasma zinc; Cashmere goats

外文摘要：Thirty-six 1.0-year-old Liao Ning Cashmere goat wethers (BW = 22.01 +/- 0.59 kg) were used to determine the effects of dietary zinc (Zn) level on the performance, nutrient digestibility and plasma Zn status during the cashmere fiber growing period. The goats were randomly divided into four groups that were fed a basal diet containing 22.3 mg Zn/kg dry matter (DM) with 0, 15, 30 or 45 mg Zn/kg DM as reagent grade ZnSO4 center dot 7H(2)O. The experiment lasted 60 days including a 7-day metabolism trial. Both average daily gain (ADG) and feed efficiency were improved (P < 0.05) by Zn Supplementation and were higher (P < 0.05) for the treatment groups Supplemented with 30 and 45 mg Zn/kg DM compared with 15 mg Zn/kg DM. Zn supplementation had no influence on the length and diameter of cashmere fiber (P>0.05). Digestibility of DM, crude protein (CP), neutral detergent fiber (NDF) and acid detergent fiber (ADF) did not differ among treatments (P>0.05). Plasma Zn concentrations were increased (P < 0.01) by Zn supplementation and were higher (P < 0.05) for the treatment groups supplemented with 30 and 45 mg Zn/kg DM compared with 15 mg Zn/kg DM. Zn apparent absorption rate and apparent retention rate were decreased (P < 0.05) by Zn supplementation, but did not differ among Zn supplemented treatments (P > 0.05). In conclusion, a control diet containing 22.3 mg Zn/kg DM was inadequate for achieving optimal growth performance in Cashmere goats, and the recommended level of dietary Zn for such goats is 52.3 mg/kg DM during the cashmere fiber growing period. (C) 2008 Elsevier B.V. All rights reserved.