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AbstractFull Text

Most fixed-time artificial insemination (FTAI) protocols utilize progesterone (P4) as a hormonal source to achieve synchronization of estrus in cattle. The use of an injectable P4 source to control estrus would be an interesting pharmacological strategy owing to the practicality of parenteral...

Author(s)
Campos, J. T.; Morotti, F.; Bergamo, L. Z.; Costa, C. B.; Seneda, M. M.
Publisher
Universidade Estadual de Londrina, Londrina, Brazil
Citation
Semina: Ciências Agrárias (Londrina), 2016, 37, 4, pp 1991-1996
Abstract

The objective of this study was to evaluate the conception rate of crossbred heifers (n=50) and cows (n=50) inseminated with sexed and conventional semen between 18 and 24 hours after estrous detection. The synchronization protocol of the estrous cycle started on day zero (D0) by inserting the...

Author(s)
Peres, A. R.; Ifran, A. M.; Lima, M. R. de; Rossi, G. F.; Corrêa, R. R.; Garcia, J. M.
Publisher
Faculdade de Veterinaria, Universidade Federal Fluminense, Niterói, Brazil
Citation
Revista Brasileira de Ciência Veterinária, 2016, 23, 3/4, pp 186-190
Abstract

Resumption of ovulation after parturition is a coordinated process that involves recoupling of the GH/insulin-like growth factor 1 axis in the liver, increase in follicular development and steroidogenesis, and removal of negative feedback from estradiol in the hypothalamus. Infectious diseases and...

Author(s)
Santos, J. E. P.; Bisinotto, R. S.; Ribeiro, E. S.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2016, 86, 1, pp 254-262
Abstract

50 repeat breeder (RB) Friesian cows were allocated to five groups of 10 cows each, to determine the effect of progesterone (P4) supplement on P4 concentrations and pregnancy rates during the corpus luteum (CL) formation and development between days 2-7 and 7-12 following a spontaneous or PGF...

Author(s)
Ababneh, M. M.; Alnimer, M. A.; Husein, M. Q.
Publisher
Asian-Australasian Association of Animal Production Societies, Kyunggi-do, Korea Republic
Citation
Asian-Australasian Journal of Animal Sciences, 2007, 20, 11, pp 1670-1676
Abstract

The main objective of this study was to identify the factors that affect the success of artificial insemination (A.I.) services under field conditions. Effects of farm, animal, semen/bull and A.I. technician on conception rate were studied from 459 inseminations. Milk progesterone concentration was ...

Author(s)
Anzar, M.; Farooq, U.; Mirza, M. A.; Shahab, M.; Ahmad, N.
Publisher
Faculty of Veterinary Science, University of Agriculture, Faisalabad, Pakistan
Citation
Pakistan Veterinary Journal, 2003, 23, 3, pp 106-113
AbstractFull Text

The has been no report published on the economical losses associated with errors in oestrus detection in cows under Iranian intensive dairy management. The study was conducted to determine the accuracy of oestrus detection by farmers using artificial insemination in Shiraz dairy farms. Milk samples ...

Author(s)
Kafi, M.; Zibaei, M.; Rahbari, A.
Publisher
Shiraz University Press, Shiraz, Iran
Citation
Iranian Journal of Veterinary Research, 2007, 8, 2, pp 131-137
Abstract

Reduced reproductive efficiency has been reported in high-producing dairy cows. Sources of reproductive inefficiency include decreased expression of estrus, increased diameter of the ovulatory follicle and reduced fertility when cows are inseminated after estrus, increased incidence of double...

Author(s)
Wiltbank, M. C.; Sartori, R.; Vasconcelos, J. L. M.; Nascimento, A. B.; Souza, A. H.; Cunha, A. P.; Gumen, A.; Sangsritavong, S.; Guenther, J. N.; Lopez, H.; Pursley, J. R.
Publisher
Nottingham University Press, Nottingham, UK
Citation
Reproduction in domestic ruminants VII. Proceedings of the Eighth International Symposium on Reproduction in Domestic Ruminants, Anchorage, Alaska, September 2010, 2010, pp 231-245
Abstract

One aim of this study was to compare the reproductive performance of cows and heifers when resynchronizing returns to oestrus for a second insemination by treating with an intravaginal progesterone-releasing device (IVD) for 7 or 8 d when estradiol benzoate (EB) was administered at the start of...

Author(s)
Cavalieri, J.; Hepworth, G.; Smart, V. M.; Ryan, M.; Macmillan, K. L.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2007, 67, 4, pp 824-834
AbstractFull Text

Author(s)
Bishop, D. K.
Publisher
Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Canada
Citation
Banff Pork Seminar Proceedings 2003. Keeping Canada Competitive, Banff, Alberta, Canada, 2003, pp 263-268
Abstract

The objective was to compare pregnancy rates to resynchronization and timed AI (TAI) protocols in lactating dairy cows that received GnRH at 23 d and were diagnosed not pregnant at 30 d after the pre-enrollment AI. Nonpregnant cows (624) at ultrasonography on day 30 (study day 0) were classified as ...

Author(s)
Bartolome, J. A.; Sozzi, A.; McHale, J.; Swift, K.; Kelbert, D.; Archbald, L. F.; Thatcher, W. W.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2005, 63, 6, pp 1643-1658

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