Results
3.1. Estrus onset and presentation
Estrus onset was earlier (Po0.05, Table 3) for ewes fed the CON
diet compared with the FMO diet. Expression of estrus in response
to synchronization was not different (P40.05) between
treatments.
3.2. Hormone profile
3.2.1. Progesterone (P4)
The concentration of P4 in serum was not significantly different
(P¼0.377) when ewes were fed the FMO diet compared with the
CON diet and the interaction between diet and day of feeding was
also not significant (P¼0.377), except on the day 8 (Po0.001) of
the synchronized luteum phase before sponge removal (Fig. 2).
3.2.2. Insulin (INS)
No differences were found between treatments (P¼0.109) in
average INS concentrations in serum by effect of supplementation
with fish meal and oil. However, INS concentrations, were affected
(Po0.001) by the interaction between diet and time. The interaction
occurred because INS was greater in CON ewes on d 10 of
the synchronised cycle, but was lower on d 4–6 of the subsequent
estrous cycle (Fig. 3).
3.2.3. Pregnancy and prolificacy
The percentage of pregnant ewes under the different treatments,
up to d 30, was not different (P40.05; Table 3). However,
at lambing, there were differences in the prolificacy index
(Po0.05); the highest index was found for the FMO group relative
to the CON group.
Results3.1. Estrus onset and presentationEstrus onset was earlier (Po0.05, Table 3) for ewes fed the CONdiet compared with the FMO diet. Expression of estrus in responseto synchronization was not different (P40.05) betweentreatments.3.2. Hormone profile3.2.1. Progesterone (P4)The concentration of P4 in serum was not significantly different(P¼0.377) when ewes were fed the FMO diet compared with theCON diet and the interaction between diet and day of feeding wasalso not significant (P¼0.377), except on the day 8 (Po0.001) ofthe synchronized luteum phase before sponge removal (Fig. 2).3.2.2. Insulin (INS)No differences were found between treatments (P¼0.109) inaverage INS concentrations in serum by effect of supplementationwith fish meal and oil. However, INS concentrations, were affected(Po0.001) by the interaction between diet and time. The interactionoccurred because INS was greater in CON ewes on d 10 ofthe synchronised cycle, but was lower on d 4–6 of the subsequentestrous cycle (Fig. 3).3.2.3. Pregnancy and prolificacyThe percentage of pregnant ewes under the different treatments,up to d 30, was not different (P40.05; Table 3). However,at lambing, there were differences in the prolificacy index(Po0.05); the highest index was found for the FMO group relativeto the CON group.
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