Ewes, infertility

In 1956 selenium was identified (123) as an essential micronutrient iu nutrition. In conjunction with vitamin E, selenium is effective iu the prevention of muscular dystrophy iu animals. Sodium selenite is adrninistered to prevent exudative diathesis iu chicks, a condition iu which fluid leaks out of the tissues white muscle disease iu sheep and infertility iu ewes (see Eeed ADDITIVES). Selenium lessens the iacidence of pneumonia iu lambs and of premature, weak, and stillborn calves controls hepatosis dietetica iu pigs and decreases muscular inflammation iu horses. White muscle disease, widespread iu sheep and cattle of the selenium-deficient areas of New Zealand and the United States, is insignificant iu high selenium soil areas. The supplementation of animal feeds with selenium was approved by the U.S. EDA iu 1974 (see Eeed additives). Much of selenium s metaboHc activity results from its involvement iu the selenoproteia enzyme, glutathione peroxidase. 

ADAMS N R, SANDERS M R (1988) Persisteut Infertility in Ewes After Prolonged Exposure to Oestradiol-17 Beta.. JReprod Fertil. 84 373-8. 

In general, isoflavonoids in clovers and other legume pasture plants pose a danger to reproduction in farm animals because they lead to difficult labor, infertility, and lactation in unbred ewes. In Australia, an estimated one million ewes fail to lamb each year because of clover disease (Harborne, 1993). 

EST-R agonist (2) [oestrogen, causes clover disease (infertility disease) of ewes] EST-R (87)... 

Tang BY, Adams NR. Oestrogen receptors and metabolic activity in the genital tract after ovariectomy of ewes with permanent infertility caused by exposure to phytoestrogens. J Endocrinol 1981 89(3) 365-370. 

Adams, N.R. (1983). Sexual-behavior of ewes with clover disease treated repeated with estradiol benzoate or testosterone propionate after ovariectomy. Journal of Reproduction cmdFertility, 68,113-117. Adams, N.R. (1990). Permanent infertility in ewes exposed to plant estrogens. Australian Veterinary... 

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