The influence of vitamin E and selenium on ewe prolificacy

Influence of Haemoglobin Type and Selenium Status on Peripheral Plasma Progesterone and Corticosteroid Concentration in Ewes Grazing Oestrogenic Pastures

“…The significance of the increase in the concentration of corticosteroids obtained in 1974 is difficult to assess particularly as selenium supplementation is reported to reduce embryonic mortality (Hartley 1963;Mudd and Mackie 1973). In addition, the result was not repeated in 1975, although in that year selenium-treated ewes had a significantly (P < 0·01) lower concentration of plasma progesterone than the untreated ewes.…”

Selenium and beef cow fertility

“…Dosing sheep with selenium before mating is beneficial (Hartley 1963;Mudd & Mackie 1973), but Southcott et al (1972) observed no effect of pre-mating selenium treatment on pregnancy rate in beef cows. However, the selenium was administered over a period of 8 months before mating, the last dose being 2 months before mating.…”

“…Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. Terms & Conditions of access and use can be found at http://www.tandfonline.com/page/terms-and-conditions INTRODUCTION Selenium-responsive infertility in ewes is well documented (Hartley 1963;Mudd & Mackie 1973;Scales 1974) and is widespread in New Zealand (Hartley et al 1960). However, no relationship between selenium and beef cow fertility has been reported.…”

Fertilization of Ova in Selenium/Vitamin E-Treated Ewes Maintained on Two Planes of Nutrition2

“…The beneficial effects of selenium (Se) in livestock have generated much interest in recent years, especially since Se-deficient areas have been identified in the United States (Kubota et al, 1967). Studies have demonstrated the effectiveness of supplemental Se and Se plus vitamin E in increasing various aspects of reproductive efficiency in female ruminants (Hartley and Grant, 1961;Hartley, 1963;Buchanan-Smith et al, 1969;Mudd and Mackie, 1973;Scales, 1974;Julien etal., 1976;Segerson et al, 1977). Buchanan-Smith et al (1969)reported that injections containing both Se and vitamin E increased the conception rate in ewes and number of lambs weaned, while Mudd and Mackie (1973) demonstrated that this nutrient combination increased the number of lambs born per ewe.…”

“…Studies have demonstrated the effectiveness of supplemental Se and Se plus vitamin E in increasing various aspects of reproductive efficiency in female ruminants (Hartley and Grant, 1961;Hartley, 1963;Buchanan-Smith et al, 1969;Mudd and Mackie, 1973;Scales, 1974;Julien etal., 1976;Segerson et al, 1977). Buchanan-Smith et al (1969)reported that injections containing both Se and vitamin E increased the conception rate in ewes and number of lambs weaned, while Mudd and Mackie (1973) demonstrated that this nutrient combination increased the number of lambs born per ewe. Infertility in flocks of Romney (Hartley, 1963) and Merino (Scales, 1974) ewes in New Zealand was significantly reduced by treatment with Se before mating, whereas infertility in beef cows in this same area of New Zealand was not affected by Se treatment prior to mating (Scales, 1976).…”