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Veterinary Medicine International
Volume 2011, Article ID 436381, 6 pages
Research Article

Use of Bayesian Inference to Correlate In Vitro Embryo Production and In Vivo Fertility in Zebu Bulls

1Department of Animal Reproduction and Veterinary Radiology, School of Veterinary Medicine and Animal Science, São Paulo State University, 18618-000 Botucatu, SP, Brazil
2Department of Surgical Clinics and Animal Reproduction, School of Odontology, São Paulo State University, 16050-680 Araçatuba, SP, Brazil
3Department of Statistics, São Carlos Federal University, 13565-905 São Carlos, SP, Brazil
4Embrapa Pecuária Sudeste, 13560-970 São Carlos, SP, Brazil

Received 10 December 2010; Accepted 27 February 2011

Academic Editor: Lorraine M. Sordillo

Copyright © 2011 Mateus José Sudano et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The objective of this experiment was to test in vitro embryo production (IVP) as a tool to estimate fertility performance in zebu bulls using Bayesian inference statistics. Oocytes were matured and fertilized in vitro using sperm cells from three different Zebu bulls (V, T, and G). The three bulls presented similar results with regard to pronuclear formation and blastocyst formation rates. However, the cleavage rates were different between bulls. The estimated conception rates based on combined data of cleavage and blastocyst formation were very similar to the true conception rates observed for the same bulls after a fixed-time artificial insemination program. Moreover, even when we used cleavage rate data only or blastocyst formation data only, the estimated conception rates were still close to the true conception rates. We conclude that Bayesian inference is an effective statistical procedure to estimate in vivo bull fertility using data from IVP.