Abstract

RUIZ, A.K et al. COMPARISON OF MANUAL AND MECHANICAL MILKING: PREVALENCE OF SUBCLINICAL MASTITIS AND MICROORGANISMS ASSOCIATED WITH MASTITIS, IN PERNAMBUCO, BRAZIL. Rev Salud Anim. [online]. 2011, vol.33, n.1, pp.57-64. ISSN 0253-570X.

Eleven dairy properties from Pernambuco State in Brasil were studied; six with hand milking and five with machine milking. The herds were constituted by animals of several races, ages and lactation periods. 185 cows were studied, resulting in 708 quarters sampled. Before sampling, the California Mastitis Test (CMT) was carried out independently of this result samples were collected for microbiologic cultures and Somatic Cells Counts (SCC) and milk composition. Prevalencies of 39,3% and 54,8% (CMT); 57,2% and 63,3% (microbiologic culture); 33,4% and 49,4% (SCC) were obtained for hand and machine milking respectively. Pathogens were isolated in 61% of the samples with higher prevalence for Corynebacterium sp. (45.0%), Staphylococcus sp. (29.6%) and Streptococcus sp. (14.6%) in hand milking; Staphylococcus sp. (36.4%), Corynebacterium sp. (27.6%), Micrococcus sp. (15.6%) and Streptococcus sp. (12.9%) in machine milking. Mechanically milked herds had higher prevalence of subclinical mastitis, both for diagnosis by CMT, as for CCS and bacteriological culture with significant differences in CMT and CCS. The sensibility pattern of the pathogens indicated bigger susceptibility for the combination Neomicine-Bacitracine-Tetracicline (NBT), Florfenicol (FLF), Cefquinome (CEQ) and Enroflorxacine (ENO) in that order; Oxaciline (OXA) was the antimicrobial with smaller percent of sensibility among the pathogens.

Keywords : mastitis; hand milking; machine milking; prevalence; Staphylococcus spp.; Corynebacterium spp.; Streptococcus spp.; antibiotics sensibility.

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