Effect of early tail-docking on luteinizing hormone pulse frequency in fat-tailed Tuj ewe-lambs

Abstract

The aim of the study was to investigate the effect of tail-docking on the LH pulse frequency in femaleTuj lambs. Twelve female lambs were assigned into two equal groups. A rubber ring was applied to the baseof the tail for shedding off. Blood samples were collected for 8 h in the 4th and 8th months of age todetermine pulsatile secretion of LH. Starting from the age of 6 months, blood samples were taken thriceweekly for progesterone analyses. There was no LH pulse in the first LH analysis but the pulses wereobserved in both groups in the second LH analysis. However, number of pulses was not different betweengroups. The plasma progesterone level was less than 1 ng/ml throughout the breeding season. In conclusion, there was no effect of the tail-docking on pulsatility of LH in fat-tailed female lambs.