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Abstract

The study of reproductive physiology in domestic ruminants has progressed from the whole animal to the molecular level in an amazingly short period of time. The volume of information on this subject is enormous; therefore, we have focused on domestic ruminants, with an emphasis on cattle. To date, ...

Author(s)
Smith, M. F.; Geisert, R. D.; Parrish, J. J.
Publisher
Oxford University Press, Cary, USA
Citation
Journal of Animal Science, 2018, 96, 7, pp 2952-2970
Abstract

Numerous treatments and protocols have been used to control the reproductive cycle in cattle, with varying effectiveness and many involving the administration of steroid hormones. Steroid hormones, such as estradiol, are perceived as having a negative impact on consumer health. This internationally ...

Author(s)
Yapura, M. J.; Zwiefelhofer, E. M.; Pierson, R. A.; Adams, G. P.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2018, 112, pp 18-25
Abstract

Objectives were to determine the effects of GnRH at the initiation of the 5-d timed artificial insemination (AI) program combined with 2 injections of PGF on ovarian responses and pregnancy per AI (P/AI) in dairy heifers, and the role of progesterone concentrations on LH release and ovulation in...

Author(s)
Lima, F. S.; Ribeiro, E. S.; Bisinotto, R. S.; Greco, L. F.; Martinez, N.; Amstalden, M.; Thatcher, W. W.; Santos, J. E. P.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2013, 96, 11, pp 7054-7065
Abstract

The association between conception rate at first service and numbers of follicles developed during a follicular wave was examined in 102 suckled beef cows and 14 heifers. Follicular development was monitored using ultrasonography for either two (trial 1) or three (trial 2) consecutive oestrous...

Author(s)
Starbuck-Clemmer, M. J.; Hernandez-Fonseca, H.; Ahmad, N.; Seidel, G.; Inskeep, E. K.
Publisher
Blackwell Publishing, Berlin, Germany
Citation
Reproduction in Domestic Animals, 2007, 42, 4, pp 337-342
Abstract

Objectives were to determine effects of lactation and pregnancy on endometrial gene expression on d 17 of the estrous cycle and pregnancy. Heifers (n=33) were assigned randomly after parturition to lactating (L, n=17) or nonlactating (NL, n=16) groups. Cows were subjected to an ovulation...

Author(s)
Cerri, R. L. A.; Thompson, I. M.; Kim, I. H.; Ealy, A. D.; Hansen, P. J.; Staples, C. R.; Li, J. L.; Santos, J. E. P.; Thatcher, W. W.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2012, 95, 10, pp 5657-5675
Abstract

Repeat-breeder heifers (RBH) have been shown to present reproductive perturbations during spontaneous cyclicity, which affects oestrus and ovulation. Some of these disturbances (e.g. deviating hormone patterns) are also present during and after cycles of twice-weekly ovum pick-up (OPU), performed...

Author(s)
Bǻge, R.; Petyim, S.; Larsson, B.; Hallap, T.; Bergqvist, A. S.; Gustafsson, H.; Rodríguez-Martínez, H.
Publisher
CSIRO Publishing, Collingwood, Australia
Citation
Reproduction, Fertility and Development, 2003, 15, 2, pp 115-123
Abstract

The objective of this study was to determine the effects of low versus physiologic plasma progesterone concentrations during the ovulatory wave on fertility in cattle. Suckled beef cows (Bos taurus; n=129) and pubertal heifers (Bos taurus; n=150) at random stages of the estrous cycle were given a...

Author(s)
Pfeifer, L. F. M.; Mapletoft, R. J.; Kastelic, J. P.; Small, J. A.; Adams, G. P.; Dionello, N. J.; Singh, J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2009, 72, 9, pp 1237-1250
Abstract

11 Swedish Red-and-White and Swedish Friesian heifers with normal oestrous cycles were monitored for signs of oestrus; the growth of the ovulatory follicle and ovulation were determined by frequent ultrasonic scanning and artificial insemination was carried out 12 h after the detection of standing...

Author(s)
Duchens, M.; Forsberg, M.; Gustafsson, H.; Edqvist, L.; Rodríguez-Martínez, H.
Citation
Animal Reproduction Science, 1995, 39, 3, pp 171-182
Abstract

In an experiment involving 277 cycling females , the females were injected with 5 mg Alfaprostol (a PGF2 alpha analogue) during spring 1979 or with 1.5 mg Alfaprostol/kg body weight during winter 1979/80. In both seasons, the females were treated according to 1 of 3 regimes: (1) 2 injections with...

Author(s)
Jochle, W.; Kuzmanov, D.; Vujosevic, J.
Citation
Theriogenology, 1982, 18, 2, pp 215-225
Abstract

This study was designed to evaluate the effect on fertility of 0.4 mg. per 1b. body weight per day of MAP when given under controlled conditions to 15- to 18-mth-old Holstein heifers weighing 630-825 1b. ; the animals were concurrently under trial in a nutritional experiment (2 types of hay). MAP...

Author(s)
FAHNING, M. L.; SCHULTZ, R. H.; GRAHAM, E. F.; DONKER, J. D.; MOHRENWEISER, H. W.
Citation
Journal of Reproduction and Fertility, 1966, 12, pp 569-571

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