The study aimed to characterize for genetic improvement purposes an ovine Hampshire flock located in the central coast of Peru. Genetic and phenotypic parameters were estimated for Birth Litter Size (TCN), Litter Weaning Weight (PCD), 2-Month Weaning Weight (PD), 5-Month Slaughter Weight (PB), and Body Weight Gain from Weaning to 5 Months Old (GPD5); and selection indices for lambs (I1 and I2) and ewes (I3) were developed using data collected between 2002 and 2004. Components of the variance and covariance were estimated using the Restricted Maximum Likelihood method (REML), under a mixed model that included sex, type of birth, season and year of birth as fixed effects, and sire as random effect. Phenotypic mean values estimated for body weight traits in lambs and productive and reproductive traits in ewes were similar to the breed standard reared under medium technology systems. The est...

The study aimed to characterize for genetic improvement purposes an ovine Hampshire flock located in the central coast of Peru. Genetic and phenotypic parameters were estimated for Birth Litter Size (TCN), Litter Weaning Weight (PCD), 2-Month Weaning Weight (PD), 5-Month Slaughter Weight (PB), and Body Weight Gain from Weaning to 5 Months Old (GPD5); and selection indices for lambs (I1 and I2) and ewes (I3) were developed using data collected between 2002 and 2004. Components of the variance and covariance were estimated using the Restricted Maximum Likelihood method (REML), under a mixed model that included sex, type of birth, season and year of birth as fixed effects, and sire as random effect. Phenotypic mean values estimated for body weight traits in lambs and productive and reproductive traits in ewes were similar to the breed standard reared under medium technology systems. The est...