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Limited By:	Subject = follicle;

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Effect of acute nutritional restriction on incidence of anovulation and periovulatory estradiol and gonadotropin concentrations in beef heifers1 (2018)

Mackey, David R.; Sreenan, Joseph M.; Roche, James F.; Diskin, Michael G.

Effect of acute nutritional restriction on incidence of anovulation and periovulatory estradiol and gonadotropin concentrations in beef heifers1 (2018)

Mackey, David R.; Sreenan, Joseph M.; Roche, James F.; Diskin, Michael G.

Abstract:

The effects of acute nutritional restriction on follicular dynamics, incidence of anovulation, and periovulatory estradiol and gonadotropin concentrations were studied in two replicates using beef heifers exhibiting regular estrous cycles. Heifers fed a diet supplying 1.2 maintenance (1.2 Mn) were synchronized using an intravaginal progesterone-releasing device for 8 days. One day before device removal, heifers were allocated randomly, within replicate, to a diet supplying 0.4 Mn (n = 20), or kept at 1.2 Mn (n = 21). On the sixth day after detected ovulation, heifers received 500 mu g of synthetic prostaglandin F-2 alpha (PGF(2 alpha)) to induce luteolysis, estrus, and ovulation of the first dominant follicle (DF). Animals were inseminated and returned to a diet of 1.2 Mn. Pregnancy diagnosis was performed 30 days later. The maximum diameter subsequently attained by the DF present at progesterone withdrawal was smaller (P < 0.01) in heifers fed 0.4 Mn. Two heifers fed 0.4 Mn ...

http://hdl.handle.net/10379/9463

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Energy Balance, Metabolic Status, and the First Postpartum Ovarian Follicle Wave in Cows Administered Propylene Glycol (2012)

Butler, Stephen; Pelton, Susanne H.; Butler, W.R.

Energy Balance, Metabolic Status, and the First Postpartum Ovarian Follicle Wave in Cows Administered Propylene Glycol (2012)

Butler, Stephen; Pelton, Susanne H.; Butler, W.R.

Abstract:

This is the author's version of a work that was accepted for publication in Journal of Dairy Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Dairy Science, 2006, 89 (8), 2938-2951. DOI:10.3168/jds.S0022-0302(06)72566-8
Mature Holstein cows were drenched daily with either 500 mL of water (CTL; n = 28) or propylene glycol (PPG; n = 28) from d 10 before parturition until d 25 postpartum. Follicular development was monitored thrice weekly by transrectal ultrasound. Blood samples were collected every 30 min from a subset of 10 cows per treatment on d 10, 2, and 25 to assess glucose and insulin response to treatments, and on d 10 postpartum, blood was collected every 10 min for 12 h to det...

http://hdl.handle.net/11019/221

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Mutations in the genes for oocyte-derived growth factors gdf9 and bmp15 are associated with both increased ovulation rate and sterility in cambridge and belclare sheep (ovis aries)1 (2018)

Hanrahan, James P.; Gregan, Scott M.; Mulsant, Philippe; Mullen, Michael; Davis, George...

Mutations in the genes for oocyte-derived growth factors gdf9 and bmp15 are associated with both increased ovulation rate and sterility in cambridge and belclare sheep (ovis aries)1 (2018)

Hanrahan, James P.; Gregan, Scott M.; Mulsant, Philippe; Mullen, Michael; Davis, George H.; Powell, Richard; Galloway, Susan M.

Abstract:

Belclare and Cambridge are prolific sheep breeds, the origins of which involved selecting ewes with exceptionally high litter size records from commercial flocks. The variation in ovulation rate in both breeds is consistent with segregation of a gene (or genes) with a large effect on this trait. Sterile ewes, due to a failure of normal ovarian follicle development, occur in both breeds. New naturally occurring mutations in genes for the oocyte-derived growth factors growth differentiation factor 9 (GDF9) and bone morphogenetic protein 15 (BMP15) are described. These mutations are associated with increased ovulation rate in heterozygous carriers and sterility in homozygous carriers in both breeds. This is the first time that a mutation in the gene for GDF9 has been found that causes increased ovulation rate and infertility in a manner similar to inactivating mutations in BMP15, and shows that GDF9 is essential for normal folliculogenesis in sheep. Furthermore, it is shown, for the fi...

http://hdl.handle.net/10379/9268

Displaying Results 1 - 3 of 3 on page 1 of 1