Variance analysis of litter size at the first parity,the sum of the first three parities and the largest parity was done in various genotypes of the Erhualian pigs.

• 以标记基因型为因子，分别对二花脸猪群体的头胎产仔数、头三胎产仔数之和以及最高产仔数进行方差分析。