RÉSUMÉObject : L'étude envisagée, se propose de vérifier la réponse de la souche Lhoman Brown soumise à l'alimentation calcique séparée. Elle s'inscrit dans le contexte de la sécurité alimentaire, la lutte contre la pauvreté et les changements climatiques sous climat tropical humide. Matériels et méthodes : L'étude a été menée au Congo-Brazzaville, sur deux bandes de poules pondeuses qui ont préalablement été nourries lors de la phase pré-ponte par un aliment complet de 2856,56 kcal/kg d'EM et 15,55 % de protéine. Le premier groupe (témoin) a reçu un aliment complet alors que le second (traité), un aliment appauvri en calcium. Le calibre des oeufs, la qualité des coquilles et le coût de production de l'oeuf sont les principales variables prises en considération lors de cette étude. Résultats : Il en ressort que les poules du lot traité, présentent 41,84% contre 36,18 %, des oeufs de calibre moyen et le poids moyen des coquilles est de l'ordre de 5,90 ± 0,95 g contre 5,42 ± 0,64 g. Le coût de production des oeufs du lot traité, étant réduit à un niveau de -14,94%. Conclusion et application des résultats : Les arguments qui sont en faveur de l'alimentation calcique séparée ont été mis en exergue. Ainsi, l'alimentation calcique séparée permet d'améliorer la qualité des produits et la rentabilité de l'élevage des poules. Mots clés : alimentation, Lhoman Brown, performances de production, climat tropical humide, CongoBrazzaville. ABSTRACT Effect of the separate calcium feeding on the performances of LHOMAN BROWN laying hens under tropical climateObjective: in hot climates, the performances of laying hens are compromised by heat stress. The separate calcium feeding has been suggested as one of the ways to reduce the harmful effect of heat on the productivity of hens under hot climate. The aim of this work was to evaluate the response of the Lhoman Brown strain subjected to a separate calcium feeding. Materials and methods: the study was conducted on a sample of one-day laying hens fed firstly with a complete food containing 2856.56 kcal / kg ME and 15.55% protein still the age of 25 weeks. Secondly, the hens have been separated into two groups. The first group (control) received a complete feed and the second (Treatment) received a diet depleted of calcium and a calcium source distributed separately. The hens were compared on the variables related on the egg size, egg quality and the cost of egg production. The results showed that the treatment improved significantly egg size (41, 85%), egg shelll (5,99g). Also, the treatment reduced significantly the cost of 14, 94% egg productions. Conclusion and application of results: the study highlighted arguments that separate calcium feeding is an alternative way to improve egg quality, egg size and the profitability in small livestock farming in hot climates, also in order to meet the needs of the market. Journal of Applied
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