Influence of Infusion of Duroc Blood on Characteristics of Chromosomes in Gansu Black Pig
杜洛克猪与甘肃黑猪杂交后代染色体遗传变异的特征

The variation of chromosomes of Gansu Black pig was caused by infusion of Duroc blood. The chromosome length ratios of No.1,6,7,13 chromosomes in the line I of Gansu Black pig were higher than those in the line II. It showed that the homogeneity in line I was higher than in line II. The number of Ag-staining nucleolus organizers (Ag-NOR) was between 1-4 in the line I and II, the average No. of Ag-NOR was different obviously between the line I and the line II. This indicated that the activity of translation in rRNA in the line I was different in the line II.