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Unlike most mammals, the mare does not have an increase of LH right before ovulation. FSH (Follicle-stimulating hormone): secreted by the pituitary, causes the ovarian follicle to develop. Levels of FSH rise slightly at the end of estrus, but have their highest peak about 10 days before the next ovulation.
Equine chorionic gonadotropin (acronym given as eCG but not to be confused with ECG) is a gonadotropic hormone produced in the chorion of pregnant mares.Previously referred to as pregnant mare's serum gonadotropin (PMSG), the hormone is commonly used in concert with progestogen to induce ovulation in livestock prior to artificial insemination.
The application of utilizing eFSH to increase the efficiency of equine embryo transfer was tested at the University of Saskatchewan.Embryos from 12 donor mares at 8 days of ovulation were recovered, scored, then transferred to 37 recipients mares who were tested for pregnancy after 7-10 days. 5 pregnancies resulted from the 15 embryos were recovered from the eFSA treatment group and 4 ...
Ovulation occurs about 109 hours after the start of follicle growth. Estrogen peaks at about 11 am on the day of proestrus. Between then and midnight there is a surge in progesterone, luteinizing hormone and follicle-stimulating hormone, and ovulation occurs at about 4 am on the next estrus day. The following day, metestrus, is called early ...
Before ovulation, the luteinizing hormone levels dramatically increase; this is known as the "LH surge". This test can recognize the LH surge about 1-1.5 days prior to ovulation. Additionally, some ovulation prediction kits detect estrone-3-glucuronide. This is a breakdown product of estrogen and will have increased levels in the urine around ...
Follicles that have fewer FSH-receptors will not be able to develop further; they will show retardation of their growth rate and become atretic. Eventually, only one follicle will be viable. This remaining follicle, called the dominant follicle, will grow quickly and dramatically—up to 20 mm in diameter—to become the preovulatory follicle.
The mare has two ovaries, usually 7 to 8 cm (2.8 to 3.1 in) in length and 3 to 4 cm (1.2 to 1.6 in) thick, that generally tend to decrease in size as the mare ages. In equine ovaries, unlike in humans, the vascular tissue is cortical to follicular tissue, so ovulation can only occur at an ovulation fossa near the infundibulum.
14714 Ensembl ENSG00000147437 ENSMUSG00000015812 UniProt P01148 P13562 RefSeq (mRNA) NM_001083111 NM_000825 NM_008145 RefSeq (protein) NP_000816 NP_001076580 NP_032171 Location (UCSC) Chr 8: 25.42 – 25.42 Mb Chr 14: 67.98 – 67.99 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Gonadotropin-releasing hormone (GnRH) is a releasing hormone responsible for the release of follicle ...