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Subject = ovarian-function;
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Displaying Results 1 - 2 of 2 on page 1 of 1
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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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Optimising reproductive performance of beef cows and replacement heifers
(2018)
Diskin, M. G.; Kenny, D. A.
Optimising reproductive performance of beef cows and replacement heifers
(2018)
Diskin, M. G.; Kenny, D. A.
Abstract:
A reproductively efficient beef cow herd is fundamental to meeting the protein and specifically, red meat demand of an ever increasing global population. However, attaining a high level of reproductive efficiency is underpinned by producers being cognisant of and achieving many key targets throughout the production cycle and requires significant technical competency. The lifetime productivity of the beef bred female commences from the onset of puberty and will be dictated by subsequent critical events including age at first calving, duration of the postpartum interval for each successive calving, conception and pregnancy rate and ultimately manifested as length of intercalving intervals and number of calves weaned over her lifetime. Puberty in heifers is a consequence of the interactive effects of genetics and both pre- and post-weaning nutrition. Early onset of puberty is essential to achieving the first main reproductive target for beef cow herds; first calving at 2 years of age. ...
http://hdl.handle.net/10379/11205
Displaying Results 1 - 2 of 2 on page 1 of 1
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