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Short-term variations in plasma LH and testosterone in bull calves from birth to 1 year of age

1979; Bioscientifica; Volume: 55; Issue: 1 Linguagem: Inglês

10.1530/jrf.0.0550081

1741-7899

A. Lacroix, Jean Pelletier,

Animal health and immunology

LH and testosterone levels in bull calves were studied in the plasma samples collected sequentially at 15-min intervals every month during the first year of life.An episodic pattern of LH release occurred after birth and the frequency and magnitude of the LH peaks increased up to 4 months of age and decreased there- after.A testicular response was not observed before this age.It is suggested that this episodic LH activity is responsible for the testicular development which then initiates puberty.