Abstract:
The objective of this study was to determine the effects
of progestagen treatment administrated alone or coupled to an injection
of eCG to synchronize oestrus on sheep reproductive traits during the
anoestrus season under extensive management conditions of Algeria. Two
flocks differing by level of body condition score were used. Fertility
rates of treated groups, when compared to control groups, were higher
for ewes matted at lean body condition (0.45-0.47 versus 0.10), whereas
ewes matted at moderate body condition recorded higher performance during
first estrus (0.37-0.45 versus 0.10) and comparable fertility rate for
all mating period. Higher prolificacy rates were performed in synchronized
groups of poor body condition (1.38 versus 1.00) when compared to control
group. For moderate body condition flock, if progesterone and eCG treated
ewes performed higher level of litter size than do control ewes (1.54
versus 1.20) for first estrus, prolificacy rate was similar between all
groups for all mating period. Extra lambs weaned were significant for
lean body condition synchronized groups (0.45) and for moderate body condition
progestagen-gonadotropin treated group (0.33). Results indicated that
it is possible to increase extra lambs weaned in anestrous Ouled Djellal
ewes after artificially induced oestrus.
T. Madani, F. Chouia and K. Abbas, 2009. Effect of Oestrus Synchronisation and Body Condition on Reproduction
of Anoestrous Ouled Djellal Ewes. Asian Journal of Animal and Veterinary Advances, 4: 34-40.
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