Testosterone plasma profiles, as a function of age in young bulls from the bovine double-muscled Belgian white blue breed a preliminary report

Plasma testosterone (T) 10 hour-profiles were determined at 10-day intervals in 29 young double-muscled bulls from the BBB-V breed between the ages 130 days and 190 days. Age at onset of T pulsatile profiles allowed to distinguish 3 groups of animals: We hypothesize that early appearance of pulsatile T profiles might mean precocity in onset of male puberty and sexual maturity. If this assumption is true, determination of T plasma profiles at a well specified age, might allow early selection of sexually precocious and capable BBB-V males.