THE EFFECTS OF LIMB DISEASES ON THE MILK-PRODUCTION AND LIVEWEIGHT OF DAIRY-COWS

In keeping with veterinary diagnostics of digit deseases, a relationship between milk performance and liveweight was investigated in cured cows and healthy herd mates. The overall indication demonstrates 56 % of cases within 100 days after calving: 63.1 % of hoof diseases, 31.0 % of cutis and subcutis diseases, 5.9 % of joint diseases. The higher the proportion of the Black Pied Lowland breed, the higher the number of cases and the greater the severity of limb diseases (longer treatment and higher selection). The cured cows had the significantly lower milk performance (P < 0.05 to P < 0.001) and the worse fitness and the loss of liveweight; this applied mainly to first-calvers (I -milk: F11 generation - 1 006 kg, N generation -648 kg, I - liveweight: F11 generation: -17.0 kg, N generation -31.0 kg, II to IV - milk: F111 generation -602 kg, P < 0.001 per lactation, liveweight: N generation -41.0 kg, P < 0.01 at the age of 150 days after calving; milk and weight gain correlation: F111 and N generations r = -0.353 to -0.395, P < 0.05). The effect of sire individuality on the health of daughters' limbs was confirmed.