文献类型：期刊文献

英文题名：Effects of dietary copper on ruminal fermentation, nutrient digestibility and fibre characteristics in Cashmere goats

作者：Zhang, Wei; Wang, Runlian; Zhu, Xiaoping; Kleernann, David O.; Yue, Chunwang; Jia, Zhihai

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, Zhanjinag 524088, Peoples R China

年份：2007

卷号：20

期号：12

起止页码：1843

外文期刊名：ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES

收录：SCI-EXPANDED(收录号：WOS:000250686300009)、、Scopus(收录号：2-s2.0-38049155604)、WOS

语种：英文

外文关键词：copper; rumen fermentation; nutrient digestibility; Cashmere fibre characteristics

外文摘要：Thirty-six 1.5 year-old Inner Mongolian White Cashmere wether goats (body weight 28.14 +/- 1.33 kg) were used to determine the effects of dietary copper (Cu) concentration on ruminal fermentation, nutrient digestibility and cashmere fibre characteristics. Wethers were fed a basal diet (containing 7.46 mg Cu/kg DM) that was supplemented with either 0 (control), 10, 20 or 30 mg Cu/kg DM. To ensure full consumption, animals were fed restrictedly with 0.75 kg feed (DM) in two equal allotments per day. The results indicated that: (1) supplemental 10 mg Cu/kg DM in the basal diet significantly (p < 0.05) decreased ruminal fluid pH value and total VFA concentrations were significantly (p < 0.05) increased on all Cu treatment groups. (2) Cu supplementation had no influence on DM intake and digestibility of DM, CP and ADF (p > 0.05); however, NDF digestibility of groups supplemented with 10 and 20 mg Cu/kg DM were significantly higher than that of the control group (p < 0.05). Apparent absorption and retention of copper were decreased with increasing level of supplementation. (3) 20 mg Cu/kg DM treatment significantly (p < 0.05) improved cashmere growth rate, but cashmere diameter was not affected by Cu supplementation (p > 0.05). In conclusion, supplementation of cashmere goats with Cu at the rate of 10 to 20 mg/kg DM in the basal diet resulted in some changed rumen fermentation and was beneficial for NDF digestibility, while supplementation of 20 mg Cu/kg DM improved cashmere growth. Collectively, the optimal supplemental Cu level for cashmere goats during the fibre growing period was 20 mg/kg DM (a total dietary Cu level of 27.46 mg/kg DM).