Leptin gene expression, circulating leptin, and luteinizing hormone pulsatility are acutely responsive to short-term fasting in prepubertal heifers: relationships to circulating insulin and insulin-like growth factor 1. - Amstalden,M.; Garcia,M.R.; Williams,S.W.; Stanko,R.L.; Nizielski,S.E.; Morrison,C.D.; Keisler,D.H.; Williams,G.L. (Biol Reprod, 2000)