Crossing Pattern Parents Litter Size Fertility Lactation (kg) Litter Weight (kg) ♂ ♀ At Birth At Weaning HY Yorkshire Huai pig 59 12.97 52.72 0.855 10.685 YH Huai pig Yorkshire 22 10.09 48.93 1.088 12.829

Table 1: The comparison of reciprocal crosses between Yorkshire and Huai pig (1956-1959).