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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

The aim of the present study was to evaluate the effects of the PGF treatment given at the onset of a synchronization of ovulation protocol using a norgestomet (NORG) ear implant on ovarian follicular dynamics (Experiment 1) and pregnancy per AI (P/AI; Experiment 2) in cyclic (CL present) Bos...

Author(s)
SáFilho, M. F.; Marques, M. O.; Gimenes, L. U.; Torres Júnior, J. R. S.; Batista, E. O. S.; Carvalho, J. P. B.; Baruselli, P. S.
Publisher
Elsevier B. V., Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2014, 144, 1/2, pp 1-5
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 objective was to monitor changes in ovarian status in heifers exposed to a progesterone insert with or without concurrent GnRH injection. oestrus was manipulated in 283 heifers (31 breeding clusters) by administering GnRH, progesterone, and PGF at 5 stages of the oestrus cycle. oestrus was...

Author(s)
Stevenson, J. S.
Publisher
American Dairy Science Association, Savoy, USA
Citation
Journal of Dairy Science, 2008, 91, 12, pp 4640-4650
Abstract

Progesterone-containing devices can be inserted intravaginally for 14 d to presynchronize the estrous cycle for timed artificial insemination (TAI) in beef heifers ("14-day CIDR-PG" or "Show-Me-Synch" program). The progesterone treatment is effective for presynchronization because cattle develop a...

Author(s)
Escalante, R. C.; Poock, S. E.; Mathew, D. J.; Martin, W. R.; Newsom, E. M.; Hamilton, S. A.; Pohler, K. G.; Lucy, M. C.
Publisher
Elsevier Inc., Philadelphia, USA
Citation
Journal of Dairy Science, 2012, 95, 9, pp 5102-5108
AbstractFull Text

This study was conducted to investigate the effectiveness of fixed-time artificial insemination (TAI) in dairy heifers treated with progesterone-based protocol. The study was performed at the university farm located in southwestern Brazil in May 2009. A total of 39 cycling crossbred dairy heifers...

Author(s)
Oliveira, L. Z.; Lima, V. F. M. H. de; Oliveira, C. S.; Alves, B. G.; Graff, H. B.; Santos, R. M. dos
Publisher
Universidade Federal do Rio Grande do Sul, Faculdade de Veterinária, Porto Alegre, Brazil
Citation
Acta Scientiae Veterinariae, 2011, 39, 2, pp 964
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

Our objectives were to identify stages of the oestrous cycle at which initiation of a timed artificial insemination (Ovsynch/TAI) protocol may reduce pregnancy rates and to monitor ovarian follicle dynamics and corpus luteum (CL) development after initiation of the Ovsynch/TAI protocol at different ...

Author(s)
Moreira, F.; Sota, R. L. de la; Diaz, T.; Thatcher, W. W.
Citation
Journal of Animal Science, 2000, 78, 6, pp 1568-1576
Abstract

293 Anatolian cows housed in small barns were examined for infertility problems. The total incidence of reproductive problems in small barns was 44.70%. The conception rates were 68.5 and 51.2% for cows and heifers at first service, respectively. The incidence of delayed ovulation, cystic ovarian...

Author(s)
Kaya, M.; Gulyuz, F.; Tasal, I.; Uslu, B. A.
Publisher
Indian Veterinary Association, Chennai, India
Citation
Indian Veterinary Journal, 2005, 82, 9, pp 957-958
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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