Microbiological studies on subclinical mastitis in sheep
1988
Ipsilantis, S. | Sarris, K. | Papadopoulos, O. (Aristotelion Univ., Thessaloniki (Greece). Veterinary School. Microbiological Inst.)
Eighty eight (88) lactating ewes were selected from a population of 1590 animals in 10 flocks. The milk of the 152 clinically normal lactating udders was found positive in the modified Whiteside test (W.S.T+) in 34 samples (22.4%) and doubtfull (7) in 37 (24.4%) and 2*10(exp 6) in 18 (11.8%). Cultures were positive in 57 samples (37.5%), with most common Staphylococcus spp (45 samples) and Streptococcus spp (5 samples). WST+ samples contained a mean of 1,580,000 cells/ml, (79.4%) had 10(exp 6) cells/ml and (73.5%) gave positive culture. WST+ samples contained a mean of 630.000 cells/ml, only (19.0%) had 10(exp 6) cells/ml and (47.6%) gave positive cultures. WST-samples contained a mean of 320.000 cells/ml, (5.2%) had 10(exp 6) cells/ml and (22.7%) gave positive cultures. The WST was found a reliable flock test. A cell count of 10(exp 6) cells/ml is considered as a limit for evidence of mastitis.
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