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All cows in 6 spring-calving herds were examined for pregnancy using rectal palpation, real-time ultrasonography or enzyme immunoassay of milk samples for oestrone sulfate content [date not given]. A complete set of results was obtained from 2139 cows, of which 1906 (98.1%) were pregnant and 233 (10...
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The effects of Se and I supplementation on growth rate and on thyroid and somatotropic function were examined for heifer calves from two herds fed pasture. Supplementation of calves with intraruminal Se pellets increased the basal plasma concentration of 3,5,3'-triiodothyronine and reduced the basal...
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In 2 herds, yearling dairy heifers were given 2 or 4 intraruminal pellets containing elemental selenium 3 g or were not treated. During 7 months after treatment mean whole-blood glutathione peroxidase activity was higher in treated than in untreated heifers and, in one herd, which had the lowest ini...
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The effect of copper supplementation of pasture fed mares and foals on the copper status of the foals, in terms of plasma, soft tissue and bone copper concentrations and caeruloplasmin activity, was investigated. Twenty-one Thoroughbred foals from either control mares (n = 9), or copper-supplemented...
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The objective of this study was to examine the effect of selenium (Se) supplementation on voluntary feed intake in Se-deficient Angora goat kids and its temporal relationship to alterations in the concentrations of thyroid hormones in plasma and the activity of glutathione peroxidase in serum. Angor...
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The objective of this study was to determine if serum glutathione peroxidase activity reflects short-term changes in the selenium status of goats. Angora goat kids (n=14) were fed pelleted luceme containing 20 microg/kg of selenium, and treated orally with either selenium (0.1 mg/kg of liveweight we...
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Role of magnesium in dairy cattle / Roger S. Ellison -- Methods of magnesium supplementation / Ross Beal -- Selenium deficiency in New Zealand dairy cattle: recent developments / Jeffrey J. Wichtel -- Copper in cattle / Roger S. Ellison.
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