Influence of starvation and sex on some lysosomal enzymes activity in young dairy cattle

Abstract. The study included 177 Polish Friesian cattle with an over 75% Holstein proportion – 117 heifers and 60 young bulls 250 days old. The animals were progeny of 27 AI Holstein sires. All individuals were housed in a tie stall and fed ad libitum silage, hay and concentrate until the 7th month of age. From the 7th to the 8th month of age the animals of both sexes received an ad libitum full concentrate diet. Almost in the all cases the activities of lysosomal enzymes were higher in heifers (except NAG, BGAL, AP). The 48 h starvation did not influence AAP, LAP, AP, LL, BGLU activity in bulls and BGRD, BGAL, BGLU and NAG in heifers.