The effect of carbadox on reproduction when fed to Swine up to 60 kilograms body weight.

Forty female and ten male pigs were used to study the effect of carbadox on reproductive performance when included in the diet at a level of 55 mg/kg from one week of age through approximately 60 kg body weight. Five replicates, each consisting of eight females and a pair of littermate boars, all crossfostered, were used. One boar reared on medicated feed and another on an unmedicated diet, were bred to two groups of four littermates. One female in each pair had been fed the medicated diet, and the other the unmedicated diet. The same breeding scheme was carried out for two parities. The following observations were made: length of estrous cycle, weaning-to-estrus interval; conception rate; age and weight at first estrus, at breeding, at 109 days of gestation, at farrowing and after farrowing; gestation length; and litter size and weights at birth and 28 days. The results showed that carbadox had no apparent effect on reproductive performance.