Diferencias en la calidad higiénica de la leche de tanque entre rebaños de ovino lechero con y sin programa integral de control de mamitisresultados preliminares

Resumen

Between February 2016 and May 2017 a total of 58 sampling of bulk tank milkwere carried out in 19 dairy sheep flocks belonging to Consortium for Ovine Promotion(C.P.O.), divided into two groups: Lot A with 11 flocks in which an integral mastitiscontrol program was implemented, and Lot B with 8 flocks without integral mastitis controlprogram. Variables analyzed were: somatic cell count, coagulase-negative staphylococcicount, cocci Gram-positive catalase-negative count, total bacterial count (really mesophiliccount), psychrothrofic bacterial count, coliform count and termoduric bacterial count, thefirst three groups related with mammary health and the latter four ones related with flockhygienic practices. Lot-A flocks had significantly lower counts of somatic cells (5.86 vs.6.01 log cells/ml), mesophilic bacteria (4.79 vs. 5.10 log cfu/ml), psychrotrophic bacteria(2.33 vs. 4.07 log cfu/ml) and termoduric bacteria (1.62 vs. 2,94 log cfu/ml) than lot-Bflocks. Means for staphylococci coagulase-negative counts (3.23 vs. 3.50 log cfu/ml), cocci Gram-positive coagulase-negative counts (3.07 vs. 3.43 log cfu/ml), and coliform counts(1.75 vs. 1.93 log cfu/ml) were also lower in lot A than in lot B, although such differenceswere not significant. As a whole, hygienic quality of bulk tank milk was clearly improvedin flocks included in an integral mastitis control program, probably as a consequence of animprovement of hygienic practices associated to this program.