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Selection in Guinea Pigs: II. Direct Response for Litter Size and Body Weight¹

Instituto Nacional de Investigation y Promocion Agraria, INIPA, Lima, Peru and and North Carolina State University, Raleigh 27650

Abstract

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 .069 ± .069, 19.1 g ± ± 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 .01 ± .45 for litter size, .27 ± .06 for 13-wk weight and –.09 ± .13 for index values. Estimates from weighted multiple regression procedures were .07 ± .01, .18 ± .004 and .04 ± .01 for litter size, 13-wk weight and index, respectively.

¹ Paper No. 8321 of the Journal Ser. of the North Carolina Agr. Res. Service, Raleigh.

² Univ. of California, Davis. Small Ruminants CRSP. INIPA. Huancayo 292, Lima, Peru.

³ Former head, Guinea Pig Research Farm. INIPA La Molina, Lima, Peru.

⁴ Dept. of Anim. Sci., North Carolina State Univ.