Absence of response to oestrus induction and synchronization treatment is related to lipid mobilization in suckled beef cows B. Grimard, P. Humblot, JP Mialot, N. Jeanguyot, D. Sauvant and M. Thibier Reprod. Nutr. Dev., 37 2 (1997) 129-140 DOI: 10.1051/rnd:19970201