Influence of the length of proestrus on fertility and endocrine function in female cattle

Bridges, G.A.; Mussard, M.L.; Burke, Christopher R.; Day, M. L.

doi:10.1016/j.anireprosci.2009.05.002

Cited by 101 publications

(79 citation statements)

References 29 publications

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“…Mussard et al (2003a) reported that a proestrus of 52.8G2.4 h and the corresponding follicular diameter of 13.6G0.2 mm resulted in a conception rate of 57%; and Mussard et al (2003b) found that a proestrus of 24.0G2.4 h with the corresponding follicular diameter of 11.1G0.2 mm resulted in a conception rate of 8%. The same group reaffirmed the importance of proestrus length for conception rates, irrespective of follicular diameter (Mussard et al 2007), which was also found by Bridges et al (2010).…”

Section: Proestrous Periodsupporting

confidence: 48%

Behavioral and hormonal pattern of repeat breeder cows around estrus

et al. 2015

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Repeat breeder (RB) cows were compared with normal (CTRL) ones with respect to behavioral estrus intensity, endocrine patterns and concentrations of plasma estradiol, progesterone and LH around estrus, and ovulation timing. A total of 27 and 31 cycles in 12 RB and 18 CTRL cows, respectively, were synchronized by means of the Ovsynch protocol followed by a single PG injection after 7 days. Behavioral estrus and ovulation were observed in 81.5 and 83.8% of the synchronized cycles in the RB and CTRL cows respectively. The RB and CTRL groups had similar estrus durations of 21.4 and 19.6 h respectively, but estrus was more intense in the RB, as indicated by numerically higher overall activity indexes and higher peak neck activity. The interval from PG injection to estrus onset (considered as proestrus) was 8.2 h shorter in RB than in CTRL cows, at 47.9 and 56.1 h respectively (P!0.007), but the average preovulatory follicle size was similar. The estradiol concentration at peak was numerically higher (21%) and the AUC tended to be higher in the RB cows than in the CTRL cows. LH secretion during the period from 18 to 3 h before the LH peak was also lower in RB than in CTRL cows: 2.5 and 4.6 ng/ml respectively (P!0.01). In conclusion, the behavioral estrus was more intense in the RB cows; nevertheless, short proestrus and subdued LH concentrations before the LH peak, which could impair oocyte competence and development, were first reported in RB cows.

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Section: Proestrous Periodsupporting

confidence: 48%

Behavioral and hormonal pattern of repeat breeder cows around estrus

et al. 2015

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“…However, even with this potential improvement in quality, it did not affect the results of total blastocysts, and blastocyst grade 1 (Table I). Moreover, we could not observe any difference (P > 0.05) inretrivied rate (59.0% CONT vs. 61.0% CAT), cleavage rate (30.9 CONT vs. 36.7 CAT) and blastocyst rate (19.8 CONT vs. 15.6 CAT), this results were similar to those produced by Holstein cows (Bridges et al 2010).…”

Section: Resultssupporting

confidence: 74%

Butaphosphan and cyanocobalamin: effects on the aspiration of oocytes and in vitro embryo production in Jersey cows

et al. 2017

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“…Efficacy of GnRH-induced LH secretion resulting in ovulation of ovarian follicles depended on maturity of the follicle exposed to GnRH [6]. Follicles induced to ovulate before reaching 11 mm in diameter were less likely to result in pregnancy than ovulation of larger follicles in beef cows [7].…”

Section: Introductionmentioning

confidence: 99%

Altered progesterone concentrations by hormonal manipulations before a fixed-time artificial insemination CO-Synch + CIDR program in suckled beef cows

et al. 2014

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We hypothesized that pregnancy outcomes may be improved by inducing luteal regression, ovulation, or both (i.e., altering progesterone status) before initiating a timed AI program in suckled beef cows. This hypothesis was tested in two experiments in which cows were treated with either PGF 2 (PG) or PG + GnRH before initiating a timed AI program to increase the proportion of cows starting the program in a theoretical marginal (< 1 ng/mL; Experiment 1) or elevated (≥ 1 ng/mL; Experiment 2) progesterone environment, respectively. The control was a standard CO-Synch + CIDR program employed in suckled beef cows (100 µg GnRH im locations (n = 1,537) were assigned to either: (1) control or (2) PrePG (same as control with a PG injection on study Day −13). The PrePG cows had larger (P < 0.05) follicles on study Day −10 and more (P < 0.05) ovulated after GnRH-1 compared with control cows (60.6 vs. 36.5%), but pregnancy per TAI was not altered (55.5 vs. 52.2%, respectively). In Experiment 2, cows (n = 803) at 4 locations were assigned to: (1) control or (2) PrePGG (same as control with PG injection on study Day −20 and GnRH injection on study Day −17). Although pregnancy per TAI did not differ between control and PrePGG cows (44.0 vs. 44.4%, respectively), cows with BCS > 5.0 or ≥ 77 d postpartum at TAI were more (P < 0.05) likely to become pregnant than thinner cows or those with fewer days postpartum. Presynchronized cows in both experiments were more (P < 0.05) likely than controls to have luteolysis after initial PG injections and reduced (P < 0.05) serum progesterone; moreover, treatments altered the proportion of cows and pregnancy per TAI of cows in various progesterone categories before the onset of the TAI protocol. In combined data from both experiments, cows classified as anestrous before the study but with elevated progesterone on D −10 had increased (P < 0.05) pregnancy outcomes compared with anestrous cows with low progesterone concentrations. Progesterone concentration had no effect on pregnancy outcome of cycling cows. In summary, luteal regression and ovulation were enhanced and progesterone concentrations were altered by presynchronization treatments before the 7-d CO-Synch + CIDR program, but pregnancy per TAI was not improved.3

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Influence of the length of proestrus on fertility and endocrine function in female cattle

Cited by 101 publications

References 29 publications

Behavioral and hormonal pattern of repeat breeder cows around estrus

Behavioral and hormonal pattern of repeat breeder cows around estrus

Butaphosphan and cyanocobalamin: effects on the aspiration of oocytes and in vitro embryo production in Jersey cows

Altered progesterone concentrations by hormonal manipulations before a fixed-time artificial insemination CO-Synch + CIDR program in suckled beef cows

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