文献类型：期刊文献

英文题名：Effects of dietary copper on growth performance, nutrient digestibility and fiber characteristics in cashmere goats during the cashmere slow-growing period

作者：Zhang, Wei[1];Wang, Runlian[2];Kleemann, David O.[3];Gao, Mingyu[1];Xu, Jianhai[1];Jia, Zhihai[1]

机构：[1]China Agr Univ, Coll Anim Sci & Technol, State Key Lab Anim Nutr, Beijing 100094, Peoples R China;[2]Guangdong Ocean Univ, Dept Anim Sci, Zhanjiang 524088, Peoples R China;[3]S Australian Res & Dev Inst, Turretfield Res Ctr, Adelaide, SA 5350, Australia

年份：2009

卷号：85

期号：1

起止页码：58

外文期刊名：SMALL RUMINANT RESEARCH

收录：SCI-EXPANDED(收录号：WOS:000270010400009)、、Scopus(收录号：2-s2.0-68949099427)、WOS

基金：This work was supported in part by a grant from National Key Technologies R & D Program (No. 2008BADB21305).

语种：英文

外文关键词：Copper; Growth performance; Nutrient digestibility; Fiber characteristics; Cashmere goats

外文摘要：Thirty-six 2.5-year-old wether Inner Mongolian White Cashmere Goats (IMWG) (BW=42.7+/-3.44kg) were used to determine the effects of dietary copper (Cu) concentration on growth performance, nutrient digestibility and fiber characteristics during the cashmere slow-growing period. Wethers were stratified by weight and randomly assigned to four dietary treatments, which included a control diet containing 5.60 mg Cu/kg DM, the control diet supplied. respectively, with 10, 20 and 30 mg Cu/kg DM (total dietary Cu level of 5.60, 15.6, 25.6 and 35.6 mg/kg DM). The experiment lasted 50 days including a 10-day preliminary trial and 10-day metabolism trial. Average daily feed intake (ADFI) did not differ among treatment groups (P>0.05), except that the supplement providing 30 mg Cu/kg DM decreased average daily gain and gain efficiency (P<0.05). Copper supplementation had no influence on digestibility of DM, CP and ADF (P>0.05), however, NDF digestibility of the treatment group supplemented with 30 mg Cu/kg DM was lower compared with that of other groups (P<0.05). Length and growth rate of cashmere fiber were higher in the treatment group supplemented with 20 mg Cu/kg DM compared with other groups (P<0.05), but cashmere diameter was not affected by Cu supplementation (P>0.05). In conclusion, supplementation of Cu at the levels of 10, 20 and 30 mg/kg DM to the basal diet containing 5.60 mg Cu/kg DM had no influence on ADFI or nutrient digestibility of DM, CP and ADF in cashmere goats, while 30mg Cu/kg DM supplementation had a negative effect on growth performance and NDF digestibility. However, 20 mg Cu/kg DM supplementation of the basal diet enhanced cashmere growth. Hence, the appropriate supplemental level during the cashmere slow-growing period is deemed to be 20mg Cu/kg DM (total dietary Cu level of 25.6 mg/kg DM). (C) 2009 Elsevier B.V. All rights reserved.