Abstract
Data from 1664 guinea pigs of two non-inbred lines or strains were used to estimate phenotypic and genetic parameters of growth. This study suggests the presence of considerable additive genetic variance for growth in one additional mammal. Pooled estimates of heritability for weaning weight, final weight, gain from birth to weaning and gain from birth to 91 days ranged from 0.46 to 0.52. The estimates of heritability for birth weight and gain from weaning to 91 days were 0.25. Thus it appears that selection for increased growth rate should be effective. The high genetic correlation between weaning weight and final or market weight of 0.89 suggests that selection for market weight might be based upon weaning weight with only a slight loss in efficiency.
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