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Animal Science Database

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Abstract

Two experiments were conducted with the aim of determining the effect of equine chorionic gonadotropin (eCG) administration on day 14 after insemination on ovarian response and pregnancy establishment in postpartum anestrous beef cows. In both experiments, cows were subjected to a progesterone- and ...

Author(s)
Núñez-Olivera, R.; Castro, T. de; Bó, G. A.; Piaggio, J.; Menchaca, A.
Publisher
Elsevier Inc, New York, USA
Citation
Domestic Animal Endocrinology, 2018, 62, pp 24-31
Abstract

This study aimed to clarify the feasibility of a novel timed artificial insemination (TAI) protocol using ultrasonography, and to determine the associations between the ovarian component and fertility. In Experiment 1, 272 Japanese Black cows with a corpus luteum (CL) ≥18 mm in diameter were...

Author(s)
Funakura, H.; Shiki, A.; Tsubakishita, Y.; Mido, S.; Katamoto, H.; Kitahara, G.; Osawa, T.
Publisher
Society for Reproduction and Development, Tokyo, Japan
Citation
Journal of Reproduction and Development, 2018, 64, 2, pp 109-115
Abstract

The effects of eCG on follicular growth, ovulation, and pregnancy per artificial insemination (P/AI) in multiparous and primiparous Bos indicus beef cows submitted to timed artificial insemination (TAI) were evaluated in three experiments. In experiments 1 (follicular responses; n=64), 2...

Author(s)
Sales, J. N. S.; Bottino, M. P.; Silva, L. A. C. L.; Girotto, R. W.; Massoneto, J. P. M.; Souza, J. C.; Baruselli, P. S.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2016, 86, 9, pp 2290-2295
Abstract

Eighteen beef cows with their calves were assigned to 3 groups considering body conditions scores at calving (BCSC): T1 (high BCSC, maintained throughout the study); T2 (low BCSC, increased during the study); and T3 (low BCSC, maintained throughout). An estrus synchronization protocol was...

Author(s)
Domínguez-Muñoz, M. A.; Guerra-Puga, J. A.; Berrones-Morales, H. G.; López-Zavala, R.; Salinas-Chavira, J.
Publisher
Taylor & Francis, Abingdon, UK
Citation
Acta Agriculturæ Scandinavica. Section A, Animal Science, 2018, 68, 3, pp 124-133
Abstract

The objective of this study was to compare the presence of ovarian activity and pregnancy rates to temperature variation at the vulvar skin measured by infrared thermography (IRT). In addition, we also aimed to evaluate the IRT as a non-invasive method to evaluate animal breeding from fixed timed ...

Author(s)
Radigonda, V. L.; Pereira, G. R.; Favaro, P. da C.; Barca Júnior, F. A.; Borges, M. H. F.; Galdioli, V. H. G.; Koetz Júnior, C.
Publisher
Springer, Amsterdam, Netherlands
Citation
Tropical Animal Health and Production, 2017, 49, 8, pp 1787-1791
Abstract

This study evaluated the effect of different doses of eCG (control, 300 or 400 IU) administered at progesterone (P4) device removal in suckled Bos taurus beef cows undergoing a timed artificial insemination (TAI) protocol. A total of 966 cows received a P4 insert and 2.0 mg intramuscular estradiol...

Author(s)
Pessoa, G. A.; Martini, A. P.; Carloto, G. W.; Rodrigues, M. C. C.; Claro Júnior, I.; Baruselli, P. S.; Brauner, C. C.; Rubin, M. I. B.; Corrêa, M. N.; Leivas, F. G.; SáFilho, M. F.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2016, 85, 5, pp 792-799
Abstract

Two experiments were designed to test the hypothesis that pregnancy rates after fixed-time artificial insemination (FTAI) in beef heifers and cows may be improved by delaying insemination of females that have not expressed estrus before FTAI. In Exp. 1, estrus was synchronized for 931 heifers...

Author(s)
Thomas, J. M.; Poock, S. E.; Ellersieck, M. R.; Smith, M. F.; Patterson, D. J.
Publisher
American Society of Animal Science, Savoy, USA
Citation
Journal of Animal Science, 2014, 92, 9, pp 4189-4197
Abstract

Two experiments were performed to evaluate the reproductive performance of zebu beef cows treated with different doses of eCG at the end of a progesterone (P4)/estrogen based protocol for timed artificial insemination (TAI). In Experiment 1, suckling Bos indicus Nelore cows (n=261) received, on day ...

Author(s)
Alvarez, R. H.; Pugliesi, G.; Natal, F. L. N.; Rocha, C. C.; Ataide Júnior, G. A.; Melo, A. J. F.; Otzuk, I. P.; Oliveira, C. A. de; Humblot, P.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2018, 118, pp 150-156
Abstract

This is a review of the physiology and endocrinology of the estrous cycle and how ovarian physiology can be manipulated and controlled for timed artificial insemination (TAI) in beef and dairy cattle. Estrus detection is required for artificial insemination (AI), but it is done poorly in dairy...

Author(s)
Colazo, M. G.; Mapletoft, R. J.
Publisher
Canadian Veterinary Medical Association, Ottawa, Canada
Citation
Canadian Veterinary Journal, 2014, 55, 8, pp 772-780
Abstract

Two experiments evaluated controlled internal drug release (CIDR)-based protocols to synchronize estrus in primiparous 2-year-old beef cows. In each experiment, treatments were balanced according to body condition score and days postpartum. Experiment 1 compared the 14-day CIDR-PG (14-d) and 7-day...

Author(s)
Abel, J. M.; Bishop, B. E.; Thomas, J. M.; Ellersieck, M. R.; Poock, S. E.; Smith, M. F.; Patterson, D. J.
Publisher
Elsevier, New York, USA
Citation
Theriogenology, 2017, 87, pp 306-315

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