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Daily changes in concentrations of prolactin in serum of prepubertal bulls exposed to short- or long-day photoperiods



Daily changes in concentrations of prolactin in serum of prepubertal bulls exposed to short- or long-day photoperiods



Proceedings of the Society for Experimental Biology and Medicine. Society for Experimental Biology and Medicine 191(1): 37-42



Early temporal changes in prolactin (PRL) concn. in serum after a sudden change in photoperiod, and daily responsiveness to PRL-releasing and inhibiting factors were investigated in prepubertal Holstein bull calves exposed to different photoperiods. In calves switched from 8-h light:16-h dark to 16-h light:8-h dark, there was no observable change in the daily pattern of serum PRL concn. after 1, 2 or 4 days.

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Accession: 001791922

Download citation: RISBibTeXText

PMID: 2497468

DOI: 10.3181/00379727-191-42886



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