The aim of this study was to estimate the variance components, heritability, and genetic and phenotypic correlations of the productive traits of the Saños and Mantaro guinea pig lines, developed at the Santa Ana Agrarian Experimental Station, Junín (Peru). The consanguinity of the two lines was also calculated. Records from 2017 to 2020 were studied. The productive traits of weight at birth (PN), weaning (PD), at week 4 (P4), week 8 (P8) and week 13 (P13) of 1622 and 1874 guinea pigs of the Saños and Mantaro line, respectively were analysed. The estimation of the variance components was carried out using single-character models, while the estimation of genetic and phenotypic correlations was carried out using bivariate models. The fixed effects considered in the model were sex (S), total births (TN), parturition number (NP) and the mother's parturition season (Tp). The animal and litt...

The aim of this study was to determine the productive and reproductive parameters of the Saños and Mantaro guinea pig lines, developed at the Santa Ana Agrarian Experimental Station, in the central highlands of Peru. Records from the years 2017 to 2020 of 1773 and 1888 guinea pigs of the Saños and Mantaro lines, respectively, were analysed. The productive parameters evaluated were the weights at birth (PN), at weaning (PD) and at the fourth (P4), eighth (P8) and thirteenth week (P13). The reproductive parameters were litter size (TC) and calving interval (IP). The fixed effects considered in the model were genetic line (L), sex (S), calving number (NP), TC and season (Tp - trimesters). Covariates were included such as the mother’s weight at delivery (PMP); PN, PD, P4 and P8 in the productive parameters. The animal effect was included as random in the reproductive parameter models. Th...