Influencia de las espículas peneanas del cobayo sobre el comportamiento sexual, valoración espermática y fertilidad del macho

Abstract

The study determined the influence of penile spicules on sexual behavior, fertility and sperm quality parameters in guinea pigs (Cavia porcellus). For this research 10 male guinea pigs five months old, average weight 988.3 ± 11.40 g were included. 40 females and four months old, average weight 815.3 ± 11.80 g, under the same conditions of supply and maintenance. Five randomly selected males were removed surgically penile spicules. A guinea pig without spicules and other normal were kept, as a replacement in case of death of an experimental unit and were excluded from the initial procedure. Three tests were performed: in the first were divided into two treatments; T1 =4 male guinea pigs with penile spicules + 20 females in separate cages, T2 = 4 male guinea pigs removed penile spicules + 20 females in separate cages. Sexual behavior by direct observation of the guinea pigs in each cage was analyzed for eight consecutive days. For the second test, the same treatments T1 and T2, remained for thirty days in breeding, for fertility evaluation. Finally in the last test sperm parameters were analyzed by means of surgical removal of the testes and epididymis dissection of the guinea pigs under study, for this test replacement guinea pigs were Included. A completely randomized experimental design was used in this project. Significance tests were, T-test, Shapiro Wilk test for homogeneity analysis of variance technique was used Levene and analysis of repeated measures was performed, all with SPSS for Windows version 22®, The parameters of sexual behavior, sniffing, biting and matings were similar (P>0.05), the average number of preening was higher in the group of boars in relation to extirpated group (P<0.05). The group of females that were mated for guinea pigs without intervention, became pregnant 65% more, compared with females that were covered by the males removed spicules (P<0.01). No significant difference in the analysis of seminal parameters studied males was found. Therefore it is concluded that the removal of the penile spicules influences fertility, but not in the sexual behavior and spermatic values