In primiparous sows, plasma insulin-like growth factor-I can be affected by lactational feed intake and dietary energy source and is associated with luteinizing hormone Henry van den Brand, Armelle Prunier, Nicoline M. Soede and Bas KempReprod. Nutr. Dev., 41 1 (2001) 27-39DOI: https://doi.org/10.1051/rnd:2001109