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The Thai Journal of Veterinary Medicine

Abstract

Luteinizing hormone, testosterone and androstenedione were measured by radioimmunoassay in the blood plasma of twin bulls. Blood samples were collected every 30 minutes between 07.30 h to 20.00 h from two pairs of twin bulls, Montbeliarde breed 6 and 12 months old. They were kept under identical management condition since they were 8 days old. Mean and range of the concentration of the hormones of 6 and 12 month old bulls were respectively; LH 1.28 (0.75 -4.75), 0.62 (0.10 - 1.22) ng/ml. and 0.89 (0.50-1.35), 0.78 (0.10-1.50) ng/ml. testosterone 0.78 (0.10-2.91), 0.80 (0.12 - 2.30) ng/ml. and 1.23 (0.28 - 5.51), 1.30 (0.18 - 4.38) ng/ml androstenedione 187 (77-297), 366 (277-558) pg/ml and 190 (134 - 246), 299 (125 - 473) pg/ml. Peak frequencies of LH as well as testosterone and androstenedione varied between bulls. The two steroids peaks in each bull showed very good correlation.

DOI

10.56808/2985-1130.1150

First Page

10

Last Page

31

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