Selection in Guinea Pigs. II. Direct response for litter size and body weight
Four generations of selection for litter size, 13-wk weight and an index combining litter size and 13-wk body weight were conducted in a guinea pig population formed by intercrossing several local lines from different areas of Peru. A random selection control line was maintained also. Responses in the selected traits per generation were 0.069 ¦ 0.069, 19.1 kg ¦ 16.2 and 2.5 ¦ 20.3 for the litter size, 13-wk weight and index lines, respectively. Realized heritabilities were estimated by two methods. Estimates obtained from regression of response on cumulative selection differentials were 0.01 ¦ 0.45 for litter size, 0.27 ¦ 0.06 for 13-wk weight and -0.09 ¦ 0.13 for index values. Estimates from weighted multiple regression procedures were 0.07 ¦ 0.01, 0.18 ¦ 0.004 and 0.04 ¦ 0.01 for litter size, 13-wk weight and index, respectively
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| Format: | biblioteca |
| Published: |
1983
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| Subjects: | CUYES, PRODUCCION ANIMAL, TAMANO DE LA CAMADA, SELECCION, MEJORAMIENTO GENETICO, GANANCIA DE PESO, |
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