Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Effects of Dietary Copper on Ruminal Fermentation, Nutrient Digestibility and Fibre Characteristics in Cashmere Goats

  • Zhang, Wei (State Key Laboratory for Animal Nutrition, College of Animal Science and Technology China Agricultural University) ;
  • Wang, Runlian (Department of Animal Science, Guangdong Ocean University) ;
  • Zhu, Xiaoping (State Key Laboratory for Animal Nutrition, College of Animal Science and Technology China Agricultural University) ;
  • Kleemann, David O (Turretfield Research Centre, South Australian Research and Development Institute) ;
  • Yue, Chungwang (State Key Laboratory for Animal Nutrition, College of Animal Science and Technology China Agricultural University) ;
  • Jia, Zhihai (State Key Laboratory for Animal Nutrition, College of Animal Science and Technology China Agricultural University)
  • Received : 2007.01.20
  • Accepted : 2007.05.09
  • Published : 2007.12.01
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Abstract

Thirty-six 1.5 year-old Inner Mongolian White Cashmere wether goats (body weight $28.14{\pm}1.33$ 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).

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References

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