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Preweaning growth performance of West African shorthorn cattle and their Jersey crossbreds in Ghana

Performances De Croissance Pre-Sevrage Des Bovins A Courtes Cornes D'Afrique De L'Ouest Et De Leurs Metis Jersey Au Ghana

Crecimiento Antes Del Destete De Ganado Shorthorn De Africa Occidental Y Sus Cruces Con Jersey En Gana

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Summary

Calf records on 621 West African Shorthorn (WASH) and 3 grades of Jersey × WASH crossbreds were analysed for the effects of the level of Jersey breeding and other factors on birth weight, 205-day weaning weight and average daily gain (ADG). Crossbred calves were significantly (P<0.01) heavier at birth than purebred WASH and birth weights increased with increasing level of Jersey breeding. No significant differences were established for 205-day weaning weight, however ADG declined with increasing level of Jersey breeding suggesting possible problems of adaptation for calves of over 75% Jersey breeding. Age of dam effect was significant and linear (P<0.0001) for birth weight and significant and quadratic (P<0.01) for weaning weight and ADG, with values increasing from 3-year old dams to a peak in 7 year old dams.

Résumé

Les résultats de contrôle sur 621 veaux à courtes cornes d'Afrique de l'Ouest (CCAO) et sur 3 classes de veaux croisés Jersey × CCAO ont été analysés pour déterminer les effets du niveau de sang jersiais et d'autres facteurs sur le poids à la naissance, le poids après 205 jours de sevrage et la moyenne de gain de poids quotidien.

De façon significative, les veaux croisés pesaient plus à la naissance (P<0,01) que les CCAO de pure race. Les poids à la naissance augmentaient avec le taux de sang jersiais. Aucune différence significative n'a été remarquée pour le poids après 205 jours de sevrage, bien que la moyenne de gain de poids quotidien ait baissé avec l'augmentation de sang jersiais, ce qui suggère des problèmes éventuels quant à l'adaptation des veaux de plus de 3/4 de race jersiaise.

L'âge de la mère a un effet significatif pour le poids à la naissance et le poids au sevrage. Cet effet se retrouve sur la moyenne des gains moyens quotidiens avec des valeurs augmentant à partir des femelles de 3 ans et atteignant leur maximum chez les femelles de 7 ans.

Resumen

Se analizaron los datos de 621 terneros de Shorthorn de Africa Occidental (SAO) y 3 grados de Jersey SAO, para estudiar los efectos del nivel de cruzamiento con Jersey y otros factores sobre el peso al crecimiento, peso al destete (205 días) y el promedio de crecimiento diario (PCD). Los terneros cruzados fueron significativamente más pesados (P<0.01) al nacimento que los animales puros SAO, incrementándos el peso al tener mas sangre Jersey. No se detectaron diferencias significativas para los 205 días del destete, sin embargo, el PCD disminuyó progresivamente con el incremento de sangre Jersey, sugiriendo problemas de adaptación por encima del 75% de intercruce. La edad de la madre fue significativa y linear (P<0.0001) para peso al nacimiento, y significativa y cuadrática (P<0.01) para peso al destete y PCD, con un incremento de los valores desde los 3 anos de edad hasta un pico a los 7 años de edad de las madres.

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Ahunu, B.K., Arthur, P.F., Danbaro, G. et al. Preweaning growth performance of West African shorthorn cattle and their Jersey crossbreds in Ghana. Trop Anim Health Prod 25, 33–40 (1993). https://doi.org/10.1007/BF02236884

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