Summary
Birth (4,197) and weaning (2,441) weight data on Boran, F1 Boran Friesian and three quarter Friesian calves as well as adjusted one-year (390), 2-year (177) and 3-year (364) weights on Boran cattle were analysed to estimate the influence of genetic and environmental factors.
Boran, F1 and three quarter calves weighed 25·2, 25·4 and 25·7 kg at birth and 157·5, 176·7 and 179·9 kg at weaning, respectively. All factors included in the analysis and their interaction had significant effects on both traits with the exception of the effect of season of birth and its interaction with breed group on birth weight. Weight of Boran cattle at one-, 2- and 3-years of age were 179, 269 and 338 kg, respectively. Heritability values calculated on the basis of paternal half-sibs were 0·32, 0·24, 0·48, 0·29 and 0·24 for birth, weaning, one-year, 2-year and 3-year weights, respectively.
The study indicated that F1 crosses were 12.2% heavier at weaning than Boran calves. Of the environmental factors considered, year of birth was found to be the major source of variation mainly due to variation in the amount of rainfall between years.
Résumé
Pour apprécier l'influence des facteurs génétiques et du milieu, les auteurs ont analysé les données suivantes: poids à la naissance (4197 et au sevrage 2441) chez les veaux Boran, Boran x Frison F1, et 3/4 Frison. De même, les poids du bétail Boran à 1 an (390), 2 ans (177) et 3 ans (364) ont été analysés. Les veaux Boran, F1 et 3/4 Frison pesaient respectivement 25,2–25,4–25,7 kg à la naissance et 157,5–176,7 et 179,9 kg au sevrage. Tous les fracteurs pris en compte pour l'analyse des données et de leur interaction avaient des effets significatifs sur les deux caractères à l'exception de la saison de naissance et de son interaction avec le groupe racial sur le poids à la naissance. Le poids du bétail Boran à 1 an, 2 ans et 3 ans était respectivement de 179, 269 et 338 kg. Les valeurs d'héritabilité calculée sur la base des demi-frères et demisoeurs paternels étaient de 0,32-0, 24,0, -48-0,29 et 0,24 pour la naissance, le sevrage, et les poids à 1, 2 et 3 ans respectivement.
L'étude a relevé que les croisements F1 étaient plus lourds de 12,2 p.100 au sevrage que les veaux Boran. Enfin, parmi les facteurs du milieu considérés, l'année de naissance est apparue comme la source principale de variation, due principalement à la variation de la pluviométrie d'une année à l'autre.
Resumen
Se analizaron los pesos al nacer (4,197) y al destete (2,441) de ganado Boràn, F1 Borán Friesian y tres cuartos terneros Friesian y los pesos ajustados al año (390), a los 2 años (177) a los 3 años (364) de ganado Borán. Para estimar la influencia de factores genéticos y ambientales.
El ganado Borán, F1 y tres cuartos pesaron 25.2, 25.4 y 25.7 kg al nacimiento y 157.5, 176.7 y 179.9 kg al destete, respectivamente. Todos los factores incluidos en el análisis y su interacción tuvieron efecto significativo en ambos factores con la excepción del efecto de la estación sobre nacimientos y sus interacciones con grupo racial, sobre peso al nacer. El peso del ganado Borán a 1, 2 y 3 años de edad fueron 179, 269 y 338kg, respectivamente. Los valores de heredabilidad para pesos calculados sobre la base de medio-hermanos paternos, fueron 0.32, 0.24, 0.48, 0.29 y 0.24 para nacimento, destete, 1 año, 2 años y 3 años, respectivamente.
El estudio indico que los cruces F1 fueron 12.2% mas pesadas al destete que las crias Boran. De los factores ambientales considerades el año de nacimiento fue hallado ser el de mayor variacion principalmente debidoals variacion in la precipitacion pluvial entre años.
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Banjaw, K., Haile-Mariam, M. Productivity of Boran cattle and their Friesian crosses at Abernossa Ranch, rift valley of Ethiopia. II. Growth performance. Trop Anim Health Prod 26, 49–57 (1994). https://doi.org/10.1007/BF02241133
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DOI: https://doi.org/10.1007/BF02241133