Impact of food deprivation on ova transport 51 Fi g u r e 4 . Serum levels of triglycerides (means ± SEM) before and after time 0 = start of treatment. Fi g u r e 5 . Plasma levels of progesterone (means ± SEM) before and after time 0 = time of ovulation. Fi g u r e 6 . Levels of prostaglandin F2α-metabolite (means ± SEM) before and after time 0 = start of treatment. Acta vet. scand. vol. 42 no. 1, 2001