Fig. 7

Effect of acute dietary restriction on the bovine estrous cycle in non-lactating dairy cows. On day 43, DMI is reduced from 100% (11.7 kg/d) to 33% (3.84 kg/d) for 15 days (the time period bounded by the two red lines). During the restriction period, one can observe a decrease of glucose in the store (g), insulin in the blood (f) and IGF-1 (e), an absence of LH pulses (a), and a decrease of amplitude in the FSH waves (b), leading to anovulation and failure in luteolysis with increasing P4 (d). The cycle re-starts soon after the end of the restriction period