[Circadian plasma LH changes in young bulls].
Six young postpubertal bulls (1 year of age) were blood sampled on one to three occassions each, at hourly intervals for 25 hours. One of them was sampled on a separate occasion every 10 minutes for 2 hours. They were managed in similar conditions since they were 8 days old. LH was measured by radioimmunoassay. There was not a circadian periodicity of LH levels. Peak frequencies or magnitudes varied widely not only between bulls but also between days.
D000818:Animals; D002417:Cattle / Q000502:physiology*; D002940:Circadian Rhythm; D007986:Luteinizing Hormone / Q000097:blood*; D008297:Male; D010903:Pituitary Gland, Anterior / Q000502:physiology
D007986:Luteinizing Hormone
Variations circadiennes de la LH plasmatique chez le jeune taurillon