کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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2457965 | 1554418 | 2008 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Effects of dietary copper on nutrient digestibility, growth performance and plasma copper status in cashmere goats Effects of dietary copper on nutrient digestibility, growth performance and plasma copper status in cashmere goats](/preview/png/2457965.png)
Thirty-six 1.0-year-old wether Inner Mongolian White Cashmere Goats (IMWG) (BW = 28.8 ± 1.35 kg) were used to determine the effects of dietary copper (Cu) concentration on growth performance, nutrient digestibility and plasma Cu status during the cashmere non-growing period. Wethers were stratified by weight and randomly assigned to four dietary treatments that contained 0 (control), 10, 20 and 30 mg of supplemental Cu/kg DM. The Cu concentration was 7.38 mg/kg DM in the basal diet. Body weight was recorded on two consecutive days at the start and end of the 60-day experimental period. Blood samples were collected via the jugular vein on day 0, 15, 30, 45 and 60. Average daily gain and gain efficiency were higher (P < 0.01) in the treatment group supplemented with 10 mg Cu/kg DM compared with other groups, and were lower (P < 0.01) in the treatment group supplemented with 30 mg Cu/kg DM compared with other groups. The supplement providing 30 mg Cu/kg DM decreased average daily feed intake (P < 0.01). Copper supplementation had no influence on digestibility of DM and CP (P > 0.05), however, NDF and ADF digestibility and N retention of the treatment group supplemented with 10 mg Cu/kg DM were higher than that of the treatment group supplemented with 30 mg Cu/kg DM (P < 0.01). Plasma Cu concentrations were increased (P < 0.05) by all Cu supplemented treatments on day 15, 30, 45 and 60 of the experiment (P < 0.01), but did not differ between groups supplemented with Cu (P > 0.05). In conclusion, supplementation of the basal diet with 10 mg Cu/kg DM (the total dietary Cu level of 17.4 mg/kg DM) in the basal diet enhanced growth performance and improved nutrient digestibility and plasma Cu status of cashmere goats.
Journal: Small Ruminant Research - Volume 74, Issues 1–3, January 2008, Pages 188–193