Open Journal of Veterinary Medicine, 2015, 5, 234-242 Published Online December 2015 in SciRes. http://www.scirp.org/journal/ojvm http://dx.doi.org/10.4236/ojvm.2015.512032 How to cite this paper: Hernández, A., Galina, C.S., Diaz, R., Rubio, I., Corro, M. and Romero, J.J. (2015) Comparison of Two Insemination Programs in Synchronized Early Postpartum Zebu Cows under Tropical Conditions: An Economic Appraisal. Open Journal of Veterinary Medicine, 5, 234-242. http://dx.doi.org/10.4236/ojvm.2015.512032 Comparison of Two Insemination Programs in Synchronized Early Postpartum Zebu Cows under Tropical Conditions: An Economic Appraisal Adalinda Hernández 1 , Carlos Salvador Galina 1* , Ramiro Diaz 1 , Ivette Rubio 2 , Manuel Corro 2 , Juan José Romero 3 1 Departamento de Reproducción, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Mexico City, México 2 Centro de Enseñanza Investigación y Extensión en Ganadería Tropical, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autónoma de México, Tlapacoyan, México 3 Escuela de Medicina Veterinaria, Universidad Nacional, Heredia, Costa Rica Received 24 September 2015; accepted 6 December 2015; published 11 December 2015 Copyright © 2015 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/ Abstract To evaluate an artificial insemination program in postpartum Bos indicus cows and by using de- terministic models, to estimate the possible economic advantages of insemination by appointment over detected estrus, sixty-three multiparous animals were synchronized using a progestagen de- vice inserted at day 31 and withdrawn after 9 days (average time for withdrawal was 40.9 ± 6.8 days). Cows were observed continuously from 0700 to 1800 during 72 h. The percentage of ani- mals detected positive to estrus by riding behavior was 43.4%, transrectal palpation, 22% and heat detector patches, 4.6%. The percentage of cows ovulating as evidenced by progesterone sam- ples taken at 9 and 11 days after the average estrus response was 73%. The economical assess- ment by using the values obtained in the present study afforded that the cost of semen, ovulation rate and fertility point to a definitive advantage of using AI at fixed time over a program based on estrus detection. Keywords Insemination, Estrus Detection, Behavior, Bos indicus * Corresponding author.