Parámetros genéticos para caracteres productivos y reproductivos en Holstein y Jersey Colombiano

Abstract

El objetivo de este estudio fue estimar parámetros genéticos y fenotípicos en características productivas y reproductivas en ganado Holstein y Jersey de Antioquia, Colombia. La información fue obtenida de 85 hatos lecheros de raza Holstein y 7 hatos de raza Jersey, ubicados en 18 municipios del Departamento de Antioquia. Las características productivas evaluadas fueron: producción de leche (PL), porcentaje de proteína (PP), porcentaje de grasa (PG) y puntaje de células somáticas (SCS) y las características reproductivas evaluadas fueron: intervalo entre partos (IEP), días abiertos (DA), número de servicios por concepción (NSC) y tasa de concepción (TC). Los componentes de (co)varianza, los parámetros genéticos y fenotípicos fueron estimados empleando modelos mixtos univariados y bivariados y las soluciones de las ecuaciones de los modelos mixtos fueron obtenidas mediante el método de máxima verosimilitud restricta libre de derivadas. Las heredabilidades obtenidas para características productivas oscilaron entre 0,22 y 0,35, excepto para SCS que fueron bajas (h2

Genetic parameters for milk traits, somatic cell, and total bacteria count scores in Brazilian Jersey herds

“…Results of Jersey herds from Colombia, reported by Rincón et al (2015) (P% = 3.44% and F% = 4.66%) and Zambrano et al (2014) (P% = 3.44% and F% = 4.71%) were also similar to those of the present study. In addition, our average value for SCS (5.9) was close to the value estimated by Missanjo et al (2013) for Jersey in Zimbabwe (5.54) and higher than the values reported by Zambrano et al (2014) prominent position in the world rank of milk production, the productivity of Jersey herd in Brazil is more similar to that in underdeveloped countries such as Zimbabwe and Colombia, compared with that in developed countries such as USA. This result indicates the need to implement Jersey breeding programs that lead to the selection of animals based on estimated genetic breeding values.…”

“…In previous studies carried out with the Jersey breed in other countries (Sharma et al, 1983;Missanjo et al, 2013;Rincón et al, 2015;Zambrano et al, 2014) estimates of heritability for MY ranging from low to moderate were found. The value found in the present study (0.16±0.02) was similar to those reported by Sharma et al (1983) and Rincón et al (2015), who found the heritability for MY in the Jersey breed of 0.14 and 0.15, respectively.…”

“…The average value observed for milk production in the present study (5017.5 kg) was greater than the average values reported in other studies about Jersey breed in Tropical region. Missanjo et al (2013) found average of 4468.0 kg for Jersey in Zimbabwe, while Rincón et al (2015) and Zambrano et al (2014) reported 4234.0 L/lactation and 3857.0 L/lactation for Jersey in Colombia. Our results for fat (192.3 kg and 4.3%) and protein (173.0 kg and 3.3%) traits were also very similar to those reported by Missanjo et al (2013), who found 199 kg and 4.42% for fat traits and 158 kg and 3.52% for protein traits.…”

“…In this study, we estimated the heritability of SCS at 0.21±0.03, which indicates a genetic variability for selection, but that the genetic gain per generation would be moderate. The SCS has been little studied in Jersey cattle, and previous estimates of heritability were low and ranged from 0.01 to 0.11 (Missanjo et al, 2013;Zambrano et al 2014;Rincón et al, 2015). However, estimates of heritability reported for the Holstein breed by Weller and Ezra (2004) Dube et al (2008) (0.19), andWasana et al (2015) (0.22) in the first lactation of cows in Israel, South Africa, and South Korea, respectively, are closer to that detected in this study.…”

Estudio de las correlaciones entre valores genéticos producción – reproducción y tipo lineal de los toros Holstein en Ecuador

“…Valores similares reporta (Zambrano et al, 2014), en donde indica que las correlaciones fenotípicas fueron bajas, ya que variaron entre -0,17 y 0, 16. Los animales de raza Holstein presentan un mayor volumen de producción respecto a los Pardo Suizo y Jersey, en correspondencia con los resultados presentados por (Zambrano et al, 2013), (Ríos-Utrera et al, 2015.…”