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Showing 1 to 16 of 16 for “"luteal function"”.
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Studies on the Luteal Function in the Late Pregnant Cow
… PGF2a, PGFM and LH concentrations. In vitro luteal function was not affected by estrone infusion. However, maximal luteal response was correlated with pre-infusion concentrations of conjugated estrogens suggesting a negative association between endogenous conjugated estrone and luteal …
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Effect of ovulatory follicle size on luteal function, pregnancy rate, and late embryonic/fetal mortality in beef cattle
Previous reports indicate that ovulation of small dominant follicles resulted in reduced pregnancy rates compared ovulation of large follicles in cattle. A reciprocal embryo transfer approach was used to differentiate between oocyte competence and uterine environment factors that affect …
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Priming with Oral Progestin Before Ovulation Induction Facilitates Ovarian Function in the Cat (Felis catus)
… of the mechanisms controlling ovarian function; and (2) characterize how oral progestin priming prior to exogenous gonadotropin treatment influences ovarian responsiveness, fertilization, early embryonic development and luteal function in the cat. Fecal hormone monitoring was used to …
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Retention of early pregnancy and its relationship to serum progesterone in dairy cattle
… days 28 to 37. The embryo apparently died before luteal regression. Pregnancy retention declined as body condition and age of the cow increased. Pregnancy retention between days 28 and 67 of pregnancy was associated with luteal function during d 28 to 37.
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ROLE OF OXYTOCIN AND OXYTOCINASE IN THE MATERNAL RECOGNITION OF PREGNANCY
This thesis involved the investigation of luteal, endometrial and embryonic putative gene regulators in the maternal recognition of pregnancy in the horse, with an emphasis on understanding the role of oxytocin and oxytocinase in early pregnancy. The first objective was to validate the safety and …
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Kisspeptin and neurokinin B in the regulation of the human hypothalamic-pituitary-gonadal axis
… and FSH) secretion. Men and women with loss-of-function mutations in NKB-kisspeptin pathway show hypogonadotropic pubertal delay with reduced GnRH/LH pulsatility. Studies in patients with defects in NKB signalling suggest that kisspeptin is functionally downstream of NKB, although there are very …
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Estradiol-17beta-Oxytocin Induced Cervical Dilation in Sheep: Application to Transcervical Embryo
… was concern that the E2-OT treatment may alter luteal function and that embryo quality would decrease as the superovulatory response to FSH increased. In Exp. 1, 32 ewes were assigned to a 2 x 2 factorial array of treatments. On d 7, ewes received an i.v. injection of either 100 micrograms of E2 …
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Ovulatory response to GNRH agonist during early and late fall in mares
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-11 without embargo terms
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The Effects of a GnRH Antagonist, Cetrorelix, on Ovarian Function in Cattle
… and 6 days after cetrorelix treatment to assess luteal function. In all cetrorelix-treated heifers, dominant follicle regression occurred, and a new follicular wave emerged consistently 5.8 ± 0.3 days after treatment. There was a tendency for cetrorelix to reduce the diameter of the corpus luteum …
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Regulation of Serum and Ovarian Relaxin Levels and Corpus Luteum Function During the Second Half of Pregnancy in the Rat (Ovary, Birth, Gestation)
… The influence of the maternal pituitary on CL function during Phase I was then investigated. While rats bearing one conceptus had markedly reduced serum and luteal relaxin levels, serum P4 levels, and CL weights from days 14 to 20 compared to rats bearing a full complement of > 8 conceptuses, …
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Prostaglandin metabolism in the ovine corpus luteum
… to gain insight into the relative importance of luteal biosynthesis of prostaglandin and possible catabolism of PGF2α by the corpus luteum. Expression patterns of two enzymes (cyclooxygenase-2 and 15-hydroxyprostaglandin dehydrogenase) important to prostaglandin synthesis and catabolism are …
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DEVELOPMENT OF A CULTURE SYSTEM FOR BOVINE LUTEAL CELLS: EXAMINATION OF LUTEOTROPIC AND LUTEOLYTIC MECHANISMS
<p>The function of bovine luteal cells in tissue culture was examined. Corpora lutea from regularly cycling dairy cows were dissociated with collagenase and cultured in Ham's F-12 medium with or without serum. The serum-free medium was supplemented with insulin, transferrin and hydrocortisone. …
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Effects of Lipopolysaccharide Induced Inflammatory Response on Early Embryo Survival in Ewes
… of progesterone (P4) for evaluation of luteal function. At day 25 or 26 pc, detection for pregnancy was examined. Intoxication of day 5 or 6 pregnant ewes treated with LPS, TNF-&agr;, or LPS+Dex did not differ in pregnancy status among treatment groups (p=0.298) and more control ewes …
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Biochemistry of ovarian cells in vitro
… how prostaglandins may be involved in ovulation, luteal regression and uterine physiology in primates and non-primates. Finally the possible role(s) of prostaglandins in semen is discussed. Granulosa cells obtained from human Graafian follicles can be induced to luteinize in tissue culture, if …
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Angiogenesis and angioregression gene expression analyses in swine corpus luteum
… differentiation and controlled regression of the luteal tissue, accompanied by an intense angiogenesis and angioregression. Indeed, the CL is one of the most highly vascularised tissue in the body with a proliferation rate of the endothelial cells 4- to 20-fold more intense than in some of the …
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Determining the role of nerve growth factor-beta in seminal plasma on bovine reproduction
… systems as well. Most notable is its function in camelids as an ovulation inducing agent with a dose-dependent luteotrophic effect. While also present in the seminal plasma of spontaneously ovulating species, such as the bull, the role of NGF was initially thought to be limited to …