目的 研究现存混养的条件下挪威红牛配种荷斯坦奶牛后的妊娠优势，以提高荷斯坦奶牛的繁殖力。 方法 以荷斯坦奶牛作为母本，进口挪威红牛冻精为父本，进行杂交改良（挪威红牛♂×荷斯坦奶牛♀），培育杂种牛，统计不同月份、不同年龄段的配种数、妊娠数、妊娠率。 结果 杂交种牛相比于荷斯坦牛，自然发情配种的妊娠率提高36.41百分点；同期处理配种，妊娠率提高30.24百分点；青年牛配种，妊娠率提高47.64百分点；群体年度配种，妊娠率提高了36.83百分点，杂交牛场配种妊娠率显著高于荷斯坦牛场。 结论 杂交牛场经过挪威红牛乳肉兼用型牛的品种改良，明显提高了牛场群体繁育率。

Objectives The pregnancy advantage of Norwegian red bull after crossing with Holstein cow under existing conditions of mixed farming was studied to improve the reproductive capacity of Holstein cow. Methods Holstein cows were fertilized with frozen semen of Norwegian red bull imported (Holstein cow♀×Norwegian red bull♂)to produce hybrids. The number of mating and pregnancies, and the pregnancy rates for different months and age groups were recorded. Results The pregnancy rate of hybrids by natural estrus mating was 36.41 percentage points higher than that of Holstein cow. The pregnancy rate of hybrids by same period mating, young cattle mating, and annual population mating increased by 30.24,47.64,and 36.83 percentage points, respectively. The pregnancy rate in hybrid cattle farm was significantly higher than that in Holstein cow farm. Conclusions The hybrid cattle farm significantly increased the reproduction rate of the cattle population through the improvement of Norwegian red bull with both milk and meat types.