AGE, WEIGHT, BACKFAT AND TIME OF MATING EFFECTS ON PERFORMANCE OF GILTS

摘要: An experiment was conducted involving 429 gilts that were managed to stimulate estrus after 140 d of age, bred at first, second or third observed and study factors relating reproductive performance weaning the first litter. The average followed by coefficient variation (%) in parentheses were: age 167.2 d (11.8); weight 106.8 kg (15.5); backfat 19.1 mm (17.8); backfat/weight 0.18 (16.2) weight/age 0.64 (11.5). Sixty-two one-half percent exhibiting did so between 140 170 d age. Fifty-eight exhibited prior 180 d less than 110 kg liveweight. There relatively low correlations indices growth rate fatness with estrus. Reproductive not enhanced delaying breeding puberty. Key words: Pigs, reproduction, sexual maturity, weight,