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The resistance of milk samples to the activity of Streptococcus agalactiae as affected by pasture


, : The resistance of milk samples to the activity of Streptococcus agalactiae as affected by pasture. American Journal of Veterinary Research 17(63): 227-230

Milk samples were obtained from cows during the weeks just prior to and after the cows were turned on pasture and were tested for resistance to acid production by S. agalactiae. This was accomplished by inoculating the samples with the streptococcus, and following 24 hours incubation, estimating the acid produced by titrating with 0.1N NaOH. Samples collected in the weeks immediately after the feed change required more NaOH to neutralize them, and thus were less resistant, than those obtained prior to the change. The average increase for 3 pasture seasons from a total of 84 cows was 18.5% and in one year was 27.5%. Partial recovery in resistance occurred in the next 2 months and this was maintained to the end of the summer in one year but in another, further losses again occurred towards the end of the season. A paralleling situation was noted between the seasonal losses encountered in resistance of the samples from the experimental herds and the onset in other herds of extensive mastitis problems associated with S. agalactiae.

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PMID: 13302643


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