Metabolic hormones and metabolites
IGF-I concentrations were measured twice a day near
oestrus (E2) and were centred on the time of the LH surge.
There was no significant change over time from 24 h before
until 24 h after the start of the LH surge. Overall, values of
IGF-I were significantly higher in cows fed a diet supplemented
with LA (n-6) in comparison with control cows
(P < 0.02) and cows fed a diet supplemented with LNA
(n-3) (P < 0.003) (Fig. 4). Insulin concentrations were
measured each week and were not affected by diet (Fig. 5a).
NEFA concentrations decreased between week 2 and week