ÉTUDE DE LA SITUATION SANITAIRE MAMMAIRE ET ESTIMATION DES PERTES LAITIÈRES CHEZ DES ÉLEVAGES BOVINS HORS SOL DANS LA RÉGION DE MAHDIA (TUNISIE)

Abstract

The objective of this work is the evaluation of udder health of cows, in order to assess the level of infection breast and therefore the quantitative estimation of losses in milk linked to high cellular levels. The study is conducted on a sample of 30 farms type aboveground in the region of Mahdia; basin dairy Tunisia, and breast health diagnosis is made by the method of indirect cell count the more used, test milk on CMT neighborhood, and two methods of direct cell counts, namely: Individual cell counts (TCC) on cow's milk and rate Cellular Herd (TCT) on milk mixture. It appears from this study that 37% of functional areas tested are infected with and scores 1 to 4, that 69% of cows have followed the ICC means> 200000 cells. / ml, European threshold beyond which a breast is considered infected and that 87% of farms were monitored using a TST> 200000 cells. / ml with the probability of subclinical mastitis in the herd. The quantitative losses in milk resulting from high cellular rates are estimated mainly from the ICC and TCT, which include an indication: 15% of monitored cows show a loss of 16% of lactation, approximately 825 kg milk / lactation and also 23% of farms are considered losses in milk production total herd of more than 5%.