Luteal maintenance in cattle after conceptus death during the first trimester of gestation

Article Abstract:

The effect of luteolysis on the onset of estrus and fertility of cows was determined by injecting cows with prostaglandin F 2-alpha (PGF) after colchicine-induced embryo death. Results showed that the onset of estrus after conceptus death was earlier in PGF-treated cows than in the controls. Pregnancy rates when the cows were exposed to bulls in the estrus immediately following embryo death were found to be comparable for both treated cows and controls. This suggests that PGF can reduce the nonpregnant period in cows after aborted gestation.

Physiological aspects, Prostaglandins, Estrus

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Ovarian follicular characteristics, embryo recovery, and embryo viability in heifers fed high-fat diets and treated with follicle-stimulating hormone

Article Abstract:

An experiment was conducted to investigate the effects of diet-induced hyperlipidemia on lipoprotein-cholesterol metabolism, ovarian follicular dynamics and embryo production in heifers exposed to follicle stimulating hormone. Results show that a high-fat diet does not increase embryo recovery but enhances follicular development and steroidogenic potential in estrous cycling heifers. It was also shown that embryo viability is not affected by elevated serum and follicular fluid cholesterol.

Hyperlipidemia, Follicle-stimulating hormone

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Effect of heat-stress on bovine embryo development in vitro

Article Abstract:

A study was conducted to determine the effect of heat-stress on bovine embryo development in vitro. Results show a rapid increase in the rate of development in the presence of chronic culture temperature increase which is followed by accelerated degeneration after hatching. It was further shown that prior exposure to stress encourages rapid embryonal growth even after hatching. This development is not observed in embryos which were not previously exposed to acute stress.

Temperature, Animal embryo, Veterinary embryology

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