Low doses of gonadotropin chorionic equine (GCe) to Pelibuey and Pelibuey x Romanov ewes
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Abstract
lambs at weaning which were the offspring of hair sheep ewes. Thirty nine multipara ewes of the genotype Pelibuey purebred and the
Pelibuey x Romanov cross, were synchronized using intravaginal sponges impregnated with flurogestone acetate (FGA) for 12 d. At the
eleventh day of treatment, ewes of each genotype were divided in two groups and injected with 140 or 280 immunizer units (IU) of GCe. A
total of two matings corresponded to each female, with 12 h interval between each one. A completely randomized design with a 22 factorial
arrangement was applied to analyze the information. None of the variables was affected (P > 0.05) by the interaction dose x genotype or
by the main effect of GCe dose. The production value was 25% higher in Pelibuey ewes than in Pelibuey x Romanov. Likewise it was in
32% of ewes treated with 280 IU regarding those receiving 140 IU of GCe. It is concluded that production value of the lamb at weaning is
the same in Pelibuey and Pelibuey x Romanov ewes, treated with doses of 140 or 280 IU of GCe.
Key words: hair ewes, cross, oestrus synchronization, economical analysis, lamb kilograms, economical income
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