[Effect of various environmental factors on the development of mastitis in cows and the implementation of a control program].

The analysis carried out aimed at obtaining numerical data concerning the environmental conditions and finding out whether their improvement would contribute to control mastitis. Examinations of the environmental conditions were made seven times during the year, and mastitis was found in 2,088 cows of the black and white breed in 12 cowsheds of the state farms in the Szczecin district. The analysis resulted in gradual improvement of zoo sanitary conditions and in a decrease of mastitis cases. This correlation was proved statistically. A characteristic correlation was found between the sanitary state and infection intensity r = 0,948, between the sanitary state aNd irritation intensity of this gland r = 0,945. Moreover, the duration of udder dryness in cows was analysed. In 50,43% of the cows examined the period of dryness was short. In these cows the intensity of infection was higher (81,7%) than in cows with a normal period of dryness (33,5%).