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  • Title: Growth hormone secretory pattern and somatomedin C plasma concentrations in newborn calves.
    Author: Coxam V, Davicco MJ, Robelin J, Barlet JP.
    Journal: J Dev Physiol; 1987 Apr; 9(2):113-21. PubMed ID: 3598147.
    Abstract:
    Plasma growth hormone (GH) and somatomedin-C (IGF-1) concentrations were measured by radioimmunoassay in 16 dairy calves during the first 20 days of postnatal life. The lowest plasma GH concentration (0.07 +/- 0.01 nmols . l-1) occurred 4 h after birth. It increased gradually until the 3rd day, to reach values similar to those measured in adult males (0.15 +/- 0.05 nmoles . l-1) and remained stable until 20 days. The lowest plasma IGF-1 concentration (3.1 +/- 0.5 nmol . l-1) was measured at 3 days, then increased at 4 days (7.6 +/- 0.6 nmol . l-1) and remained stable until 20 days of age. In nine 2-10 days-old calves, the GH secretory profile observed in blood samples collected every 30 min over a 24-h period showed 8-13 secretory spikes, without periodicity. No relationship could be demonstrated between plasma GH and IGF1 concentrations. A marked increase in plasma GH concentrations followed every morning milk feeding.
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