Conventional fixed-time artificial insemination (FTAI) compared to block FTAI in Nelore cows
DOI:
https://doi.org/10.33837/msj.v6i1.1601Keywords:
Follicle, Bovine reproduction, Pregnancy rateAbstract
Conventional Fixed-Time Artificial Insemination (FTAI) is a biotechnology widely used in beef cattle, however, the technique has shown fertility rates of females almost stabilized. Block FTAI is a technique that aims to maximize these rates, since to obtain good pregnancy results, insemination needs to be performed close to ovulation, this period is defined by the interaction between the inducer and the diameter of the dominant follicle. In this work, the objective was to analyze the pregnancy rate of Nelore cows, comparing the Block FTAI with the conventional FTAI, in two different protocols that are more used in the region, diverging only by the ovulation inducer, being Estradiol Cypionate and o Estradiol benzoate, and amount of handling. Forty multiparous Nellore cows were used. With 10 females in each of the four groups: conventional FTAI with cypionate, FTAI in Block with cypionate, conventional FTAI with benzoate and FTAI in Block with benzoate. FTAI in blocks with cypionate showed a higher pregnancy rate of 70% (P = 0.079), thus, it is a good alternative for producers in the region who did not know this technique.
References
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
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2023 The author(s)
This work is licensed under a Creative Commons Attribution 4.0 International License.
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.
