Genetic variability in Colombian Creole cattle populations estimated by pedigree information1

Abstract

Genetic parameters for cattle's growth characteristics were estimated in Romosinuano creole breed cattle forming part of the Turipaná research centre's conservation program , located in the Valle del Sinú (Córdoba, Colombia). A univariate animal model was used for production characteristics such as birth weight (BW), weaning weight (WW, adjusted at 270 days), 16-month weight (16m W), daily weaning weight gain (DWWG) and daily weight gain at 16 months (DWG16m). Mean heritability values were 0.28, 0.43 and 0.38 for BW, WW, 16m W, respectively. Mean DWWG was 0.42 and 16m W was 0.20. Direct heritability values were always greater than maternal heritability values; correlation between direct and maternal effects consistently presented negative values. Annual mean genetic values for direct effects always presented a growing tendency compared to maternal effects which revealed a decreasing tendency (except for BW). The results presented acceptable heritability values for the aforementioned parameters whilst the tendency indicated slight genetic progress, in spite of being a nucleus for conservation aimed at preserving genetic variability. Parámetros y tendencias genéticas para características de crecimiento en el ganado criollo colombiano Romosinuano R E S U M E N Se estimaron los parámetros genéticos para características de crecimiento en un núcleo de bovinos de la raza criolla Romosinuano que forman parte del Programa de Conservación del Centro de Investigación Turipaná, localizado en el Valle del Sinú (Córdoba, Colombia). Fue utilizado un modelo animal univariado para las características productivas de 'peso al nacimiento' (PN), 'peso al destete' (PD, ajusta-do a los 270 días), 'peso a los 16 meses' (P16m), 'ganancia diaria de peso al destete' (GPD) y 'ganancia diaria de peso a los 16 meses' (GP16m). Se obtuvieron valores de heredabilidad total medios (0,28; 0,43 y 0,38 para PN, PD, P16m, respectivamente); así mismo, se obtuvo un valor medio para GPD (0,42) y un valor bajo para GP16m (0,20). Los valores de heredabilidad directa siempre fueron mayores que los valores de heredabilidad materna y la correlación entre efectos directos y maternos presentó valores negativos consistentemente. Los valores genéticos anuales promedio para los efectos directos presentaron siempre una tendencia creciente a diferencia de los efectos maternos que mostraron una tendencia decreciente, con excepción del PN. Los resultados muestran valores de heredabilidad aceptables para los parámetros mencionados, mientras la tendencia indica un progreso genético leve pese a ser un núcleo de conservación cuyo objeto es preservar la variabilidad genética. Palabras clave: ganado criollo, Romosinuano, parámetros genéticos.

Population structure of Reyna Creole cattle in Nicaragua

“…of animals Animals with PEC>0.8 a Six of these were also used in herd A b Three of these were also used in herd A 2001) and Caracu in Brazil (Pereira et al 2005) than those we detected in the Reyna Creole cattle. Some information is also available for Limonero Creole cattle in Venezuela (Villasmil-Ontiveros et al 2008) and for Romosinuano, Sanmartinero, Costeño con Cuernos, and Blanco Orejinegro breeds in Colombia (Martinez et al 2008). The proportion of inbred animals in each case and the highest F x values were all lower than those found in our study.…”

“…In addition, some sires and dams have been quite old when they produced bulls, which contributed to increased generation intervals. These factors are likely to have had mixed effects on conservation prospects, since opportunities for genetic improvement are reduced by prolonged generation intervals, but losses of genetic variability per unit time may also be reduced (Martinez et al 2008). Creole cattle are generally expected to maintain production and reproduction under dry, tropical conditions where other cattle may not survive (Russell et al 2000), but whether this applies to Reyna Creole cattle needs to be confirmed.…”

Genome‐wide differential DNA methylation in tropically adapted Creole cattle and their Iberian ancestors

“…; Martínez et al . ). Two tropically adapted Creole breeds and their likely Spanish ancestors were analysed to establish epigenomic differences among groups accounting for breed similarities related to their geographical location.…”

History of registered Gyr breed in Brazilian Northeast: population structure and genetic improvement of growth traits

“…These methods have provided significant insights into the genetic structure of economically important species. Despite these advances there is still a need for information about pedigree in order to identify temporal trends and to evaluate inbreeding, confirmation of pedigree, effective size, generation interval, genetic diversity and several other important population parameters (FARIA et al, 2004;CARNEIRO et al 2009;MALHADO et al, 2008a,b;MARTÍNEZ et al, 2008). Studies utilizing historical pedigree records can identify and uncover important circumstances that have influenced the genetic history of a population (VALERA et al, 2005), moreover, some population parameters that are strongly dependent on management and mating systems have significant impacts on genetic variability.…”