Abstract

ARANIBAR, Eduardo  and  ECHEVARRIA C, Luisa. Number of ovulations per estrous cycle in Andina and Peru guinea pig (Cavia porcellus) breeds. Rev. investig. vet. Perú [online]. 2014, vol.25, n.1, pp.29-36. ISSN 1609-9117.

The aim of the study was to determine the average number of ovulating follicles in the Andina and Peru guinea pigs breeds in order to know if the difference in litter size between the two breeds is partly due to the number of ovulations. Fifteen animals of 10 weeks of age per breed were used. The day of ovulation was considered as day 0 of the estrous cycle and was determined through vaginal cytology and absence of the vaginal membrane. In day 8 of the estrous cycle vaginal cytology was done to verify that the female was in diestrus and then animals were slaughtered to obtain the ovaries. These were fixed with buffered formalin and histological sections of ovaries were stained with hematoxylin eosin. The samples were observed in optical microscope and corpus lutea (CL) were counted. The Andina breed had 3.6 ± 0.9 CL and the Peru breed had 2.8 ± 0.9 CL (p<0.05). The difference in litter size between the two breeds would be partially due to the higher number of ovulations per estrous cycle in the Andina breed as compared to the Peru breed.

Keywords : guinea pig; Peru; Andina; ovary; corpus luteum.

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