Journal ArticleDOI
The effect of selenium on infertility in ewes grazing improved pastures
Reads0
Chats0
TLDR
Trials conducted in South Australia, in an area where pasture improvement by means of the introduction of subterranean clovers has been practised for 10-15 years, have shown a significant improvement in fertility, in ewes treated with selenium, with results discussed in relation to the problem of infertility associated with the grazing of improved pastures.Abstract:
Trials conducted in South Australia, in an area where pasture improvement by means of the introduction of subterranean clovers has been practised for 10-15 years, have shown a significant improvement in fertility, in ewes treated with selenium. Analysis of all pastures grazed, and of whole blood of stock grazing them, indicated that the selenium status of the feed and of the animals was low. Phyto-oestrogen assays showed the presence of the isoflavones formononetin, genistein, and biochanin A, in the subterranean clover, which was mainly the cultivar Yarloop (Trifolium subterraneum L. var. Yarloop). Administration of selenium four to eight weeks before mating, given either as an oral dose of sodium selenite, or supplied in the form of an intraruminal selenium pellet containing elemental selenium and iron, led to an improvement in fertility; in some cases from 49 to 76 per cent. Also, lamb mortality was reduced by selenium administration to the ewes. There were differences due to selenium administration (P<0.001). Ewe fertility differed between pastures designated 'oestrogenic' and 'non-oestrogenic' (P<0.05). But no interaction between selenium and the presence of phyto-oestrogens could be shown by these experiments. The results are discussed in relation to the problem of infertility associated with the grazing of improved pasturesread more
Citations
More filters
Journal ArticleDOI
Potential Value of Plants as Sources of New Antifertility Agents II
TL;DR: The preovulatory, preimplantation, and postIMplantation antifertility mechanisms of plant substances affecting the hypothalamus-pituitary, ovary, oviduct, uterus, or vagina are discussed in terms of reproductive differences among laboratory animal species.
Book ChapterDOI
Selenium in Soils and Plants and its Importance in Livestock and Human Nutrition
TL;DR: This chapter reviews the geomedical aspects of selenium (Se), ranging from the soil through the plants to animal and human nutrition, and interactions occur with other elements and compounds.
Nutrient Requirements of Sheep
TL;DR: Nutrient requirements of all livestock are based on the size of the animal, how active the animal is, the body growth rate, and/or the animal’s level of milk production and fat content in milk produced.
Journal Article
The Two Faces of Selenium-Deficiency and Toxicity--Are Similar in Animals and Man
L D Koller,J H Exon +1 more
TL;DR: The purpose of this review article is to demonstrate the close parallelism of daily requirements, biological activity and minimum and maximum tolerable levels of selenium for animals and man.
Journal ArticleDOI
Trace element deficiencies and fertility in ruminants: a review.
TL;DR: Field experience suggests that administration of cobalt to ruminants on cobalt-deficient diets improves their impaired breeding performance and knowledge of biochemical dysfunctions from trace element deficiencies is essential to determine the role which trace elements play in fertility of ruminant animals.