Gestion zootechnique de la reproduction dans les élevages bovins laitiers dans l'Est algerien.

Abstract

The importance of the local population of part its contribution in the production of bovine meat (8o %) and in the milk production (40 %), in part the weak investment for the behaviour of its animal husbandry and its qualities of adaptability in a difficult environment, drives to us near its performances which to there were not measured. This study allowed us to estimate performances butchers: mensurations, lively weights, weight of carcass, and criteria of delicacy (weight of the skin, weight of ends and indication thoracic dactylo Others part the evaluation of the nutritional quality of the milk was taken by the measurements of the level fat , of the protein rate, specific gravity and dry material. The structure of animal husbandry was determined (sharing out by type of cattle and sharing out by stockbreeder) and from all data were calculated zootechnic parameters (IVV, DL, age in the first bet low, instant of calving, month of calving, month of drying up, rate of twinbirth.) This last made the object of a cytogenetic diagnosis and confirmed further to, the elaboration of the karyotype. These results contribute to the rare data of performances and act as support for improvement, and especially in the maintenance of this population.