Summary
Data collected on number of services per conception (NSC), age at first calving (AFC), calving interval and calf pre-weaning mortality rate of Boran cattle and their Friesian crosses were evaluated. The NSC was 1·81, 1·61 and 1·69 for Boran, F1 Boran-Friesian and three-quarter Friesian heifers respectively. The AFC varied from 31·5 months in the F1 crosses to 46·8 months in the Boran heifers artificially inseminated with Friesian semen. The mean calving intervals were 465, 552, 525 and 487 days for Boran cows naturally mated to Boran and Friesian bulls, Boran and F1 cows artificially inseminated with Friesian semen respectively. The preweaning calf mortality rate was 3·4% and was significantly influenced by parity, sex and interaction of breed with year of birth. Year as well as season had in general significant effects on the traits considered. However, the variation between mating or breeding groups was also large and it was in favour of the F1 crosses.
Résumé
Les auteurs one estimé les données obtenues sur le nombre de montes avant la conception, l'âge au premier vêlage, l'intervalle entre deux mises bas et le taux de mortalité avant sevrage sur le bétail Boran et les croisements frisons au ranch d'Abernossa (Ethiopie). Le nombre de montes était de 1,81, 1,61 et 1,69 pour les génisses Boran, F1 Boran × frisonne et 3/4 frisonne respectivement. L'âge au premier vêlage a varié de 31,5 mois pour le croisement F1 à 46,8 mois pour les génisses Boran artificiellement inseminées avec du sperme frison.
L'intervalle moyen au vêlage était de 465, 552, 525 et 487 jours pour les femelles Boran fécondées en monte naturelle respectivement par des taureaux Boran et Frison, et des vaches Boran et F1 inséminées artificiellement avec du sperme frison. Le taux de mortalité avant sevrage était de 3,4p.100. Il était influencé de façon significative par le nombre de parturitions antérieures, le sexe et l'interaction raciale avec l'année de naissance. L'année aussi bien que la saison, avaient en règle générale des effets significatifs sur les caractères considérés. Néanmoins la variation entre les groupes de monte et de naissance était également large mais jouait en faveur du croisement F1.
Resumen
Se evaluaron los datos sobre el número de servicios por concepción (NSC), edad a la primera parición (EP), intervalo entre partos y tasa de mortalidad predestete, del ganado Borán y sus cruces con Friesian. El número de servicios por concepción fue 1·81, 1·61 y 1·69 para Borán, F1 Borán/Friesian y tres cuartos novillas Friesian, respectivamente. La EP varió de 31·5 meses en los cruces F1, hasta 46·8 meses en las novillas Borán inseminadas artificialmente con semen Friesian. El intervalo entre partos fue de 465, 552, 525 y 487 días para vacas Borán servidas por monta natural con toros Borán y Friesian, vacas Borán y vacas F1 inseminadas artificialemente con semen de Friesian, respectivamente. La tasa de mortalidad predestete fue de 3·4% y fue significativamente influenciada por el número de partos, sexo e interacción de raza con el año de nacimiento. El año como también le estaciones también tuvieron efecto significativo sobre las variables consideradas. Sin embargo, la variación entre los grupos de empadre fue mayor, siendo en favor de los cruces F1.
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Haile-Mariam, M., Banjaw, K., Gebre-Meskel, T. et al. Productivity of Boran cattle and their Friesian crosses at Abernossa Ranch, rift valley of Ethiopia. I. Reproductive performance and pre-weaning mortality. Trop Anim Health Prod 25, 239–248 (1993). https://doi.org/10.1007/BF02250878
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DOI: https://doi.org/10.1007/BF02250878