Browsing by Author "Arias Vaca, Milton Rafael"

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Impacto de la condición corporal sobre la fertilidad de las cuatro razas bovinas más difundidas en la provincia de Pastaza
(2017) Arias Vaca, Milton Rafael; Pesántez Pacheco, José Luis
The effect of body condition on fertility of the four races most widespread in the province of Pastaza was investigated. 2.434 reproductive records database between 2009-2013 were used. The variables analyzed were: reproductive status pregnant and nonpregnant year, race, body condition (CC), zeal, bull or straw used, AI technician. The sample for statistical analysis of the data was based in three models, one of them is nested. The pregnancy rate achieved at the provincial level with this improvement program was 60 to 69%. The CC was only significant for C / HMz race, which showed a coefficient of linear low negative correlation with respect to pregnancy, other variables zeal, straw, technical also had statistical difference (P> 0.05). But in the second analysis model applied significant differences between the place (canton) and CC (P = 0.047) and between cow race and bull race (P = 0.006) was found. Thus we conclude that the (CC) influenced the gestation depending on place, independently of the cow race, factor place that was not important reproductive variable studied, environmental factors: year, canton and CC, influenced in levels of gestation of the study population, genetic factors analyzed cow race and father race did not influence only bull was important factor in the gestation of the cow and the human factor was decisive in causing variation in gestation
Impacto de la condición corporal sobre la fertilidad en vacas de la provincia de Pastaza- Ecuador
(2018) Arias Vaca, Milton Rafael; Pesántez Pacheco, José Luis; Lammoglia, Miguel; Rentería, Daniel; Marini, Pr
The objective was to evaluate the effect of body condition on fertility in cows from the province of Pastaza-Ecuador. We used 2434 reproductive records from the database between 2009-2013. The variables analyzed were: pregnant and non-pregnant reproductive status, year, race, body condition (CC), heat, bull or straw used, technical inseminator. The sample for the statistical analysis of the data was based on three models of ANOVA and a mixed model. The percentage of pregnancy at the provincial level achieved with this improvement program was 60 to 69%. The CC was only significant for the Charolais mestizo breed, which showed a negative linear correlation coefficient with respect to gestation, the other estrus, straw, and technical variables also did not have statistical differences (P> 0.05). But in the analysis of the second applied model, significant differences were found between the place (canton) and CC (P = 0.047) and between the breed of the cow and bull breed (P = 0.006). It is concluded that the (CC) influenced the gestation depending on the place, independent of the race of the cow, a factor that was not important in the reproductive variable studied, the environmental factors: year, canton and CC, influence the levels of pregnancy of the studied population, of the genetic factors analyzed, the breeds of the cow and the father did not influence, only the bull factor was important in the gestation of the cow and the human factor was determinant as a cause of variation in the gestation.
Las explotaciones lecheras no tienen que asumir una mala eficiencia reproductiva
(2018) Arias Vaca, Milton Rafael; Torres Rovira, Laura; Hernandez, Fernando; Gonzalez Martin, Juan Vicente; Gonzalez Bulnes, Antonio; Pesántez Pacheco, José Luis
Sin lugar a dudas, la eficiencia reproductiva compromete la rentabilidad de los rebaños. Desde los años 60, hemos ido observando como los indices reproductivos, en especial la tasa de concepción, ha ido disminuyendo a medida que la producción por lactacion y vaca se eleva.