발정재귀일령 및 초교배 일령이 돼지의 번식성적에 미치는 효과 = Effect of Weaning to Estrus Interval and Age at First Mating on Reproductive Performance in Swine

다국어 초록 (Multilingual Abstract)

On the basis of the data from 3,127 litters of Landrace and Large white breeds farrowed at S. Swine Breeding Farm from January, 1998 to December, 2000, the effects of weaning to estrus interval(WEI) and age at first mating(AFM) on reproductive traits were estimated. Total number of pigs born and number suckled per litter tended to decrease as the WEI increased from 4 to 10 days, with an estimated regression coefficient of -0.278±0.027 for the total number born and -0.217±0.025 for the number suckled on WEI in day. Litter weight at birth was heaviest in the WEI of 4-5 days and the birth weight of pig was heaviest in the WEI of 7 days. Total number of pigs born was largest in the AFM of 291∼320 days, and was also large in the AFM of 188∼200 days. Number suckled per litter and litter weight at birth were largest in the AFM of 188∼200 days. In this study the breeding females with the AFM of 188∼200 days showed relatively good performance in the total number born, number suckled, litter weight at birth and birth weight of pig, indicating the possibility of breeding the gifts as early as at the age of about 200 days if adequate managements can be provided for the gifts of the improved stocks.