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Abstract

The use of artificial insemination in cows makes possible breeding of superior animals, which are known as enhancer individuals. However, the major limitation for its expansion has been the necessity for estrus detection. Thus, programs of fixed time artificial insemination (FTAI), without the...

Author(s)
Cavalieri, F. L. B.; Colombo, A. H. B.; Andreazzi, M. A.; Gonçalves, É. A.
Publisher
Universidade Federal do Paraná, UFPR, Palotina, Brazil
Citation
Archives of Veterinary Science, 2016, 21, 1, pp 25-31
Abstract

The objective of this trial was to evaluate different post-timed artificial insemination (TAI) reproductive managements in postpartum beef cows to produce crossbred calves from artificial insemination (AI). Nellore cows (n=607), with 45 days postpartum, were inseminated at a fixed time, using a...

Author(s)
Rodrigues, W. B.; Jara, J. do P.; Borges, J. C.; Oliveira, L. O. F. de; Abreu, U. P. G. de; Anache, N. A.; Silva, K. C. da; Bezerra, A. de O.; Cardoso Junior, C. T.; Nogueira, E.
Publisher
CSIRO, Collingwood, Australia
Citation
Animal Production Science, 2019, 59, 2, pp 225-231
Abstract

The aim of this study was to compare the use of artificial insemination in time blocks (Artificial Insemination Blocks, AIB) using an 8 and 9 d estradiol-progesterone based protocol. In this experiment, lactating Nelore cows (n=253) were subjected to two estradiol-progesterone based TAI protocols....

Author(s)
Pfeifer, L. F. M.; Castro, N. A.; Neves, P. M. A.; Cestaro, J. P.; Schneider, A.
Publisher
Elsevier B. V., Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2017, 181, pp 125-129
Abstract

This study had the aim of investigating the efficiency of timed artificial insemination (TAI) through the progesterone-releasing intravaginal device (PRID), used in new condition and for the second and third times in Nelore cows. The effects of device reuse and body condition score (BCS) on the...

Author(s)
Pereira, L. L.; Ferreira, A. P.; Vale, W. G.; Serique, L. R.; Neves, K. A. L.; Morini, A. C.; Monteiro, B. M.; Minervino, A. H. H.
Publisher
Wiley, Berlin, Germany
Citation
Reproduction in Domestic Animals, 2018, 53, 3, pp 624-628
Abstract

Two experiments in Nelore cows subjected to timed artificial insemination (TAI) were designed to compare the influence of the antral follicle count (AFC/AFCs) on (1) ovarian follicular dynamics and (2) conception rates. First, multiparous cows with high (≥45 follicles; n=43) or low (≤15 follicles; ...

Author(s)
Morotti, F.; Moretti, R.; Santos, G. M. G. dos; Silva-Santos, K. C.; Cerqueira, P. H. R.; Seneda, M. M.
Publisher
Elsevier B.V., Amsterdam, Netherlands
Citation
Animal Reproduction Science, 2018, 188, pp 170-177
Abstract

The objective of this study was to compare the effects of using conventional and heterospermic semen on the pregnancy rate of Nelore cows participating in a fixed-time artificial insemination (FTAI) program. The study used 506 Nelore cows, originating from two farms (farms 1 and 2) located in the...

Author(s)
Almeida, R. G. de; Faria, F. J. C.; Fernandes, C. A. de C.; Santos, M. D. dos; Costa, D. S.
Publisher
Veterinaria Organizacion S.L., Malaga, Spain
Citation
REDVET, 2017, 18, 12, pp 121713
Abstract

The objective of this study was to evaluate the efficiency of artificial insemination in fixed time associated with estrus detection in Nellore cows. They used 917 females, all submitted to estrus synchronization protocol and formed two groups: G1 (n=489), marked on the back with fluorescent dye...

Author(s)
Souza, Í. O. T. de; Mota, L. H. C. M.; Santos, C. S. dos; Sousa, S. R. S. de; Barros, F. N.; Moraes Júnior, F. de J.; Souza, J. A. T. de; Costa, A. P. R.
Publisher
Colégio Brasileiro de Reprodução Animal, Belo Horizonte, Brazil
Citation
Revista Brasileira de Reprodução Animal, 2016, 40, 4, pp 256-258
Abstract

The use of estrogens in artificial insemination protocols for cattle is the least expensive and most efficient method currently available. However, the trend to prohibit the use of estrogens for this purpose has made it necessary to find alternatives that replace estrogens without compromising the...

Author(s)
Poncio, V. A. P.; Melo, A. J. F.; Duarte, K. M. R.; Oliveira, C. A. de; Alvarez, R. H.
Publisher
Departmento da Producao Animal, Secretaria da Agricultura, Industria e Comercio, Sao Paulo, Brazil
Citation
Boletim de Indústria Animal, 2015, 72, 3, pp 271-276
Abstract

Two experiments were conducted to evaluate the impact of two vaccines on the reproductive performance of multiparous beef cows in Mato Grosso do Sul, Midwest Brazil. In Experiment 1,765 calved multiparous Nellore cows were subjected to the same fixed-time artificial insemination (FTAI) protocol and ...

Author(s)
Ferreira, L. C. L.; Fernandes, H. J.; Silva, A. G.; Fernandes, C. E.; Dutra, I. S.; Pupin, R. C.; Lemos, R. A. A.
Publisher
Colégio Brasileiro de Patologia Animal, Rio de Janeiro, Brazil
Citation
Pesquisa Veterinária Brasileira, 2018, 38, 3, pp 456-461
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

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