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Suppression of preovulatory luteinizing hormone surges in heifers after intrauterine infusions of Escherichia coli endotoxin.
Testing the hypothesis that high cortisol concentrations associated with products of infections (endotoxin) cause derangement in the neuroendocrine mechanism controlling ovulation in heifers found that serum cortisol concentrations increased during the first 2 hours after each infusion and then decreased gradually until the next infusion. Expand
The effect of Escherichia coli endotoxin on luteal function in Holstein heifers.
It was concluded that the intact endometrium prevents the uptake of endotoxin although pathogenic E. coli organisms may disrupt the endometrial integrity sufficiently to shorten the estrous cycle by premature luteolysis. Expand
Evidence for a role of intrauterine infections in the pathogenesis of cystic ovaries in postpartum dairy cows.
The results suggest that postpartum intrauterine infections may provoke increased secretion of prostaglandin F(2alpha) and cortisol associated with the formation of cystic ovaries in dairy cows. Expand
Factors influencing the accuracy of early pregnancy detection in cattle by real-time ultrasound scanning of the uterus
Determination of pregnancy and nonpregnancy, using ultrasound scanning examinations between Days 16 and 31 days postinsemination proved to be significantly less accurate than using palpation per rectum after Day 35 postsemination, while palpation proving to be 99% accurate in diagnosing pregnancy when compared with breeding and calving records. Expand
Patterns of circulating oestrone, oestradiol-17beta and progesterone during pregnancy in the rhesus monkey.
The maternal peripheral plasma levels of estrone estradiol-17beta and progesterone were determined by radioimmunoassay during pregnancy in 8 rhesus monkeys and this decrease in plasma levels after parturition clearly points to the placenta and the fetus as main sources of estrogens. Expand
Reproductive performance in dairy cows following postpartum treatment with gonadotrophin releasing hormone and/or prostaglandin: a field trial.
Three hundred and five Holstein Friesian cows were given either gonadotrophin releasing hormone (GnRH) or saline on day 15 postpartum followed by 500 micrograms cloprostenol or saline in order to treat cows treated only with GnRH and there were no significant differences among treatment groups with respect to services per conception, number of heats detected before first service and culling for infertility. Expand
Absorption of Escherichia coli endotoxin (lipopolysaccharide) from the uteri of postpartum dairy cows.
The hypothesis that uteri of early postpartum cows are capable of absorbing endotoxin, and the absorbed endotoxin provokes changes in the serum concentrations of prostanoids is supported. Expand
Plasma progesterone concentrations in dairy cows with cystic ovaries and clinical responses following treatment with fenprostalene.
  • K. Leslie, W. Bosu
  • Medicine
  • The Canadian veterinary journal = La revue…
  • 1 November 1983
It was concluded that, if correctly diagnosed, luteal cysts can be successfully treated with fenprostalene, and conception rates following treatment can be expected to be normal. Expand
Temporal changes in serum prostaglandin F2alpha and oxytocin in dairy cows with short luteal phases after the first postpartum ovulation.
Results support the idea of a positive relationship between PGF2alpha and oxytocin concentration during the estrous cycle as well as a possible synergistic action of these hormones in the induction of luteolysis in dairy cattle. Expand
Interrelationships between ambient temperature, age at calving, postpartum reproductive events and reproductive performance in dairy cows: a path analysis.
There was an increase in the incidence of retained placenta, in the percentage of cows with abnormal vaginal discharge in the early postpartum period as well as a delay in uterine involution during the winter months. Expand