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The health of the mammary gland and productivity of three breeds of sheep, Polish Merino, Polish Lowland and Polish Highland, were studied in relation to udder morphology. The contamination of milk by pathological strains of bacteria (Staphylococci and Streptococci) was found in 15-20% of ewes. The ewes with overor undersized (> x ± SD, < x + SD) udders developed mastitis more frequently than did those with udder sizes within the limits of x ± SD. Significant correlations were found between the morphological traits of udders and milk yield of the Polish Highland ewes and the rearing results of Merino and Polish Lowland lambs.

journal of animal and feed sciences

Morphological characteristics of udders as selection criteria for improvement of mammary gland health and productivity of sheep. 2. The relationship between udder morphology and the health and productivity of ewes