Evaluación del efecto del implante SYNOVEX-H sobre la preñez de novillas Brahman con un modelo de regresión logística exacto

• Main Authors: Enrique Darghan, Sinha Surendra, Vitto Vega
• Format: Article
• Language: Spanish
• Published: Universidad Francisco de Paula Santander 2014-01-01
• Series: Ecomatemático
• Subjects: Conditional Maximum- Likelihood Estimation; Exact logistic regression.
• Online Access: http://revistas.ufps.edu.co/ojs/index.php/ecomatematico/article/view/50/45

The current investigation was made in the property Santa Rosa, genetic center of Brahman cattle in Táchira state, Venezuela. In the investigation the effect of the Synovex-H was analyzed on the pregnancy in primiparaes of 24 months of age. Of the explanatory variables, year, mounting weight and implant, resulted with significant effect, mounting weight (p<0,05) and implant (p<0,10 in exact estimation and p<0,05 in the asymptotic). Although the year of implant was not significant, the heifers incorporated in the year 2004 had a pregnancy percentage superior in 8,6% with respect 17 Eco.Mat Cúcuta-Colombia Vol. 5 No. 1 Enero-Diciembre 2014 ISSN 1794-8231 PP: 16-26 to 2003. With regard to its implants, the pregnancy percentage of 63,05 was obtained for implanted and 82,30 for not implanted. This study supports the concept that the mounting weight is beneficial for the reproduction of the heifers and simultaneously it shows how the Synovex-H has an unfavorable significant effect on the reproduction.