[Economic effect on the milk yield in cows after trimming and treating their hooves]

Experiments were carried out in production conditions on 200 highly productive cows during the lactation period for determining the percentage of hoof illnesses during cow-shed raising, as well as the influence of clipping of hooves and their treatment on milk production. In the case of restricted movement and a long period of not clipping the hooves, the so-called 'shed hooves' were proved with 55.5% of the cows, out of which 18% suffered from an illness. The cases without any visible clinical symptoms for illnesses of the hooves were the cause of a progressive reduction in monthly milk production, ranging, on the average, for a single cow from 3.7 up to 5.3 1 a day. Hoof-clipping brought about the increase of the quantity of daily milk production for a single cow on the average, within the limits 1.5-2.1. In the case of hoof illnesses the daily milk production respectively decreases and reaches 5.4 1 for a single cow. The adequate operative and medicinal treatment despite the gravity of the illness, even during the period of treatment, leads to an increase in daily milk production from 1.50 up to 1.64 1 for a single cow.