Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Effects of Lead and Particulate Montmorillonite on Growth Performance, Hormone and Organ Weight in Pigs

  • Yu, DongYou (Feed Science Institute, Zhejiang University, The Key Laboratory of Molecular Animal Nutrition Ministry of Education) ;
  • Xu, Z.R. (Feed Science Institute, Zhejiang University, The Key Laboratory of Molecular Animal Nutrition Ministry of Education) ;
  • Yang, X.G. (Feed Science Institute, Zhejiang University, The Key Laboratory of Molecular Animal Nutrition Ministry of Education)
  • Received : 2005.02.15
  • Accepted : 2005.06.25
  • Published : 2005.12.01
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Abstract

Seventy-two crossbred gilts of approximately 33 kg initial weight were used in this study. The gilts were randomly assigned into three groups. The three dietary treatments were basal diet only (control group), basal diet+10 mg/kg lead, and basal diet+10 mg/kg lead+0.5% particulate montmorillonite (PM). The results showed that the addition of lead to the diet decreased significantly the body weight and feed efficiency, but PM could restore body weight and feed efficiency of gilts compared to the Pb exposure group. There were no significant differences in weights of ovaries and uteri with addition of either lead or PM to the diet. Supplementing the lead in the diet of gilts also significantly increased the concentration of lead in blood, decreased circulating lutenizing hormone (LH) and estradiol (E$_2$) levels in serum, the addition of PM to the diet effectively adsorbed and lowered lead concentration in the blood. These data suggested that lead disrupts the signals between the hypothalamus and pituitary gland in gilts, and possibly suppressed the secretion of relative growth hormone and sex hormone. On the other hand, PM may ameliorate Pb toxicity in pigs.

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References

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