Refsdal A O
Acta Vet Scand. 1976;17(2):190-5. doi: 10.1186/BF03547927.
Non-return rates at different stages after insemination were compared in daughters (n = 21,212) of five translocation heterozygous sires with all cows and heifers (n = 610,714) represented in the Norwegian Red Cattle (NRF) breeding statistics during the period October 1970 to September 1972. The daughters of the carrier bulls showed statistically significant lower non-return rates for 0–30, 30–60, 60–90, 90–120, 120–150, 150–180 and 180–270 days as compared with the control animals. The decline in non-return percentage for the daughters of translocation sires was greater than in the control animals during the period from 0–30 to 60–90 days indicating higher losses of fetuses during the early period after insemination. Daughter groups of carrier bulls consisting of adult cows only showed higher non-return rates than groups comprising both cows and heifers.
在1970年10月至1972年9月期间挪威红牛（NRF）育种统计中，对5头易位杂合种公牛的女儿（n = 21,212）与所有母牛和小母牛（n = 610,714）授精后不同阶段的未返情率进行了比较。与对照动物相比，携带公牛的女儿在0 - 30、30 - 60、60 - 90、90 - 120、120 - 150、150 - 180和180 - 270天的未返情率在统计学上显著较低。在授精后0 - 30至60 - 90天期间，易位种公牛女儿的未返情百分比下降幅度大于对照动物，表明授精后早期胎儿损失较高。仅由成年母牛组成的携带公牛女儿组的未返情率高于由母牛和小母牛组成的组。
