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Journal of Animal Science, Vol 74, Issue 9 2239-2244, Copyright © 1996 by American Society of Animal Science

JOURNAL ARTICLE

Effect of energy balance and somatotropin on insulin-like growth factor I in serum and on weight and progesterone of corpus luteum in heifers

M. C. Yung, M. J. VandeHaar, R. L. Fogwell and B. K. Sharma
Department of Animal Science, Michigan State University, East Lansing 48824, USA.

Holstein heifers (approximately 1 yr old) were fed to be in negative energy balance (n = 14; NEB) or positive energy balance (n = 15; PEB) during four estrous cycles. Each heifer was given PGF2 alpha to control the timing of fourth estrus. From 1 d after PGF2 alpha injection until 10 d after estrus, half of the heifers were injected daily with 14 mg of somatotropin (bST), and the corpus luteum (CL) was collected on d 10. Heifers in NEB had less IGF-I in serum (P < .01), smaller CL (P < .01), and less progesterone in CL (P < .01) than heifers in PEB. Exogenous bST increased (P < .01) IGF-I in serum, but this increase was greater in heifers in PEB than those in NEB (P < .01 for interaction of energy balance and bST). Nonetheless, bST did not alter weight or progesterone content of the CL in either energy balance group. In addition, serum IGF-I during the first 10 d after estrus was not correlated to luteal weight and only weakly correlated (r = .3) with luteal progesterone content. We conclude that exogenous bST given during luteal development does not alter growth or progesterone content of the CL in heifers. Reduced concentration of IGF-I in serum during luteal development does not account for suppressed luteal growth and progesterone synthesis of heifers in NEB.


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Copyright © 1996 by the American Society of Animal Science.