Tropical Animal Health and Production

, Volume 27, Issue 2, pp 113–120 | Cite as

Reducing age at first calving in D'Dama heifers using groundnut cake as a supplement to grazed natural pasture in The Gambia

  • J. C. Tanner
  • D. A. Little
  • S. J. Holden
  • K. Dampha
Article

Summary

N'Dama heifers, initially weighing 129 kg at approximately 30 months of age, were supplemented with 250, 500 or 1000 g/head/day groundnut cake for 3 or 6 months during the dry or dry and wet seasons. Highly significant improvements in rates of liveweight gain and reproductive performance were obtained. Supplementation during the dry season only, approximately trebled the proportion of animals calving within 2 years of the beginning of the trial (6 vs 20%, P<0·05), while this increase was around eight-fold in the animals that continued to receive supplement during the wet season (6 vs 50%, P<0·05). Conceptions occurred at an overall mean liveweight of 185 kg, and a “target” liveweight of 200 kg for the first conception of N'Dama heifers is proposed as the basis for husbandry recommendations concerning these animals. It is concluded that such intervention can reduce the usually observed age at first calving of village based N'Dama heifers by 12 months, in a fashion that is both practicable and financially advantageous.

Keywords

Public Health Veterinary Medicine Comme Base Como Reproductive Performance 

Reduction De L'age Au Premier Velage Chez Les Genisses Ndama Par L'emploi Du Tourteau D'arachide En Supplément De L'alimentation Sur Paturage Naturels En Gambie

Résumé

Des génisses Ndama pesant initialement 129 kg à l'âge approximatif de 30 mois, ont reçu un supplément de 250, 500 ou 1000 g par tête et par jour de tourteau d'arachide pendant 3 ou 6 mois durant la saison sèche ou les saisons sèche et humide. On a ainsi obtenu des améliorations hautement significatives des taux de gain en poids vif et des performances de reproduction. La supplémentation pendant la seule saison sèche a triplé, en chiffres approchés, la proportion des mises bas dans les deux ans qui ont suivi le début de l'expérience (6% contre 20% avecP<0,05). L'augmentation a été de l'ordre de 8 fois supérieure chez les animaux qui ont continué à recevoir la supplémentation pendant la saison humide (6% contre 50% pourP<0,05). La conception est intervenu au poids vif moyen général de 185 kg. L'objectif est un poids vif de 200 kg pour la première fécondation des génisses Ndama, comme base des recommandations pour l'élevage de ces animaux. En conclusion, une telle intervention peut réduire de 12 mois l'âge observé habituellement à la première mise bas chez des génisses Ndama élevées en milieu villageois, et ceci d'une manière àla fois pratique et financièrement avantageuse.

Reduccion De La Edad Al Primer Parto En Novillas N'Dama Utilizando Torta De Nueces Molida Como Suplemento De Pastoreo Natural En Gambia

Resumen

Vaquillas N'Dama que inicialmente pesaban 129 kg a los 30 meses de edad, fueron suplementadas con 250, 500, ó 1000 g/cabeza/día con torta de nueces molida, durante 3 ó 6 meses durante la estación seca o seca y húmeda. Se obtuvieron ganancias significativas en peso y eficiencia reproductiva. La suplementación durante la estación seca únicamente, triplicaron la proporción de animales que parieron dentro de los dos años del inicio del ensayo (6 Vs 20%,P<0·05), mientras este incremento fue cerca de ocho veces en los animales que continuaron reciviendo el suplemento durante la estación lluviosa (6 Vs 50%,P<0·05). Las paraciones ocurrieron a un peso medio general de 185 kg siendo el objetivo propuesto un peso de 200 kg para la primera parición de Vaquillas N'Dama. Se concluye, que este tipo de intervención puede reducir la edad al primer partoa 12 meses, siendo el manejo práctico y económicô meute ventajoso.

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Copyright information

© Centre for Tropical Veterinany Medicine 1995

Authors and Affiliations

  • J. C. Tanner
    • 1
  • D. A. Little
    • 1
  • S. J. Holden
    • 1
  • K. Dampha
    • 1
  1. 1.International Trypanotolerance CentreBanjulThe Gambia

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