INSEMINAÇÃO ARTIFICIAL EM TEMPO FIXO (IATF) CONVENCIONAL COMPARADA A IATF EM BLOCO EM VACAS NELORES
DOI :
https://doi.org/10.33837/msj.v6i1.1601Mots-clés :
Folículo; Reprodução bovina; Taxa de gestação.Résumé
A Inseminação Artificial em Tempo Fixo (IATF) convencional é uma biotecnologia muito utilizada na bovinocultura de corte, no entanto, a técnica tem apresentando índices de fertilidade das fêmeas quase estabilizados. A IATF em Blocos é uma técnica que visa maximizar esses índices, visto que para obter bons resultados de prenhez, a inseminação necessita ser efetuada no momento próximo da ovulação, esse período é definido pela interação entre indutor e diâmetro do folículo dominante. Neste trabalho, o objetivo foi analisar a taxa de gestação de vacas Nelore, comparando a IATF em Bloco com a IATF convencional, em dois protocolos distintos que são mais utilizados na região, se divergindo apenas pelo indutor de ovulação, sendo o Cipionato de Estradiol e o Benzoato de Estradiol, e quantidade de manejos. Foram utilizadas 40 vacas multíparas da raça Nelore. Sendo 10 fêmeas em cada um dos quatro grupos: IATF convencional com cipionato, IATF em Bloco com cipionato, IATF convencional com benzoato e IATF em Bloco com benzoato. A IATF em blocos com cipionato apresentou maior taxa de gestação 70% (P = 0,079), dessa forma, é uma boa alternativa aos produtores da região que não conheciam essa técnica.
Références
ASBIA (2011). Brazilian Association of Artificial Insemination. Brazilian Society of Artificial Insemination. Available in: http:// www.asbia.org.br/novo/upload/mercado/relatorio2011.pdf. Acesso em: 12/06/2020.
Atkins, J. A., Smith, M. F., Wells, K. J., Geary, T. W. (2010). Factors affecting preovulatory follicle diameter and ovulation rate after gonadotropin-releasing hormone in postpartum beef cows. Part I: Cycling cows. J Anim Sci. 16-17. DOI: https://doi.org/10.2527/jas.2009-2531
Baruselli, P. S., Sales, J. N. S., Sala, R.V., Vieira, L. M., Sá Filho, M. F. (2012). History, evolution and perspectives of timed artificial insemination programs in Brazil. Animal Reproduction (pp. 139-152) São Paulo.
Bó, G. A. Baruselli, P. S. Martínez, M. F. (2003). Pattern and manipulation of follicular development in Bos indicus cattle. Anim Reprod Sci. 9-10. DOI: https://doi.org/10.1016/S0378-4320(03)00097-6
EMBRAPA (2015). TAI in blocks: A new alternative to increase the pregnancy rate of beef cows submitted to TAI protocols. (1st edition Technical Circular 141), (pp 2-3) Porto Velho.
Ferreira, E.B., Cavalcanti, P.P. & Nogueira, D.A. (2018) ExpDes: Experimental Designs. R package version 1.2.0.
França, L. M.et al. (2015). Comparison of two estradiol esters as ovulation inducers in follicular diameter and pregnancy rate in dairy cows submitted to a Fixed Time Artificial Insemination program. Brazilian Journal of Animal Production and Health. DOI: https://doi.org/10.1590/S1519-99402015000400019
Grothendieck, G. (2017) “sqldf: Manipulate R Data Frames Using SQL,” R Package Version 0.4-11
Hothorn, T., Bretz, F. & Westfall, P. (2008) Simultaneous inference in general parametric models. Biometrical Journal. 50(3): 346-63. DOI: https://doi.org/10.1002/bimj.200810425
Moral, R.A., Hinde, J. & Demétrio, C.G.B. (2017). Half-Normal Plots and Overdispersed Models in R: The hnp Package. Journal of Statistical Software, 81(10): 1–23. DOI: https://doi.org/10.18637/jss.v081.i10
Mann, G. E., Lamming G, E. (2001). Relationship between maternal endocrine environment, early embryo development and inhibition of the luteolytic mechanism in cows. Reproduction. 52-55. DOI: https://doi.org/10.1530/rep.0.1210175
Meneghetti, M., Sá Filho, O. G., Peres, R. F., Lamb, G. C., Vasconcelos, J. L. (2009). Fixed-time artificial insemination with estradiol and progesterone for Bos indicus cows I: basis for development of protocols. Theriogenology. 46-47. DOI: https://doi.org/10.1016/j.theriogenology.2009.02.010
Pfeifer, L. F. M., Castro, N. A., Melo, V. T. O., Neves, P. M. A., Cestaro, J. P., Schneider, A. (2015). Fixed-time artificial insemination in blocks: a new alternative to improve fertility in lactating beef cows. Animal Reproduction Science.12-13. DOI: https://doi.org/10.1016/j.anireprosci.2015.10.002
Perry, G. A., Smith, M. F., Lucy, M. C., Green, J. A., Parks, T. E., Macneil, M. D., Andrew, J. R., Thomas, W. G. (2005). Relationship between follicle size at insemination and pregnancy success. The National Academy of Sciences of the USA. 82-84. https://doi.org/10.1073/pnas.0501700102
Perry, G. A., Smith, M. F., Roberts, A. J., MacNeil, M. D., Geary, T. W. (2007). Relationship between size of the ovulatory follicle and pregnancy success in beef heifers. Journal of Animal Science. 67-78. DOI: https://doi.org/10.2527/jas.2006-519
Ribeiro Filho, A. L., Ferraz, A. P., Rodrigues, A. S., Bittencourt, C. S. B. T. C., Loiola, G. M. V., Chalhoub, M. (2013). Follicle diameter at the time of fixed-time artificial insemination and conception rate in Nellore cows. Cienc. anim. bras., Goiânia, v.14, n.4, (pp 501-507) Goiânia.
R Core Team (2022) R: the R project for statistical computing. Version 4.2.1. R Foundation for Statistical Computing, Vienna, Austria.
Sá Filho, M. F., Crespilho, A. M., Santos, J. E. P., Perry, G. A., Baruselli, P. S. (2010). Ovarian follicle diameter at timed insemination and estrous response influence likelihood of ovulation and pregnancy after estrous synchronization with progesterone or progestinbased protocols in suckled Bos indicus cows. Animal Reproduction Science. 51-52. DOI: https://doi.org/10.1016/j.anireprosci.2010.03.007
Sá Filho, M. F., Santos, J. E., Ferreira, R. M., Sales, J. N., Baruselli, O. S. (2011). Importance of estrus on pregnancy per insemination in suckled Bos indicus cows submitted to estradiol/progesterone-based timed insemination protocols. Theriogenology. 45-48. https://doi.org/10.1016/j.theriogenology.2011.02.022
Sá Filho, O. G., Meneghetti, M., Peres, R. F., Lamb, G. C., Vasconcelos, J. L. (2009). Fixed-time artificial insemination with estradiol and progesterone for Bos indicus cows II: strategies and factors affecting fertility. Theriogenology. 34-39. DOI: https://doi.org/10.1016/j.theriogenology.2009.02.008
Short, R. E., Bellows, R. A., Staigmiller, R. B., Berardinelli, J. G., Custer, E. E. (1990). Physiological mechanisms controlling anestrus and infertility in postpartum beef cattle. Animal Reproduction Science. 23-27. DOI: https://doi.org/10.2527/1990.683799x
Vasconcelos, J. L., Sartori, R., Oliveira, H. N., Guenther, J. G., Wiltbank, M. C. (2001). Reduction in size of the ovulatory follicle reduces subsequent luteal size and pregnancy rate. Theriogenology. 10-15. DOI: https://doi.org/10.1016/S0093-691X(01)00565-9
Téléchargements
Publiée
Comment citer
Numéro
Rubrique
Licence
(c) Tous droits réservés The author(s) 2023
Ce travail est disponible sous la licence Creative Commons Attribution 4.0 International .
Authors who publish in this journal agree to the following terms:
a) The Authors retain the copyright and grant the journal the right to first publication, with the work simultaneously licensed under the Creative Commons Attribution License that allows the sharing of the work with acknowledgment of authorship and initial publication in this journal.
b) Authors are authorized to assume additional contracts separately, for non-exclusive distribution of the version of the work published in this journal (eg, publishing in institutional repository or as a book chapter), with acknowledgment of authorship and initial publication in this journal.
c) Authors are allowed and encouraged to publish and distribute their work online (eg in institutional repositories or on their personal page) at any point before or during the editorial process, as this can generate productive changes, as well as increase impact and citation of the published work.
