Relationship of milk production in Angus and Simmental cows with milk expected progeny differences (EPDs) and calf weaning weight

摘要

Spring and fall calving Angus (n==86) and Simmental (n==96) cows at three differentlocations in Kansas were used to evaluate the relationships between milk production, MilkExpected Progeny Difference (Milk EPD), and calf weaning weight. A change of 1 lb in MilkEPD resulted in 4.95 lb change in calf weaning weight in Angus and 4.60 lb in Simmental.Each lb increase in Milk EPD predicted a 69.87 lb increase in total lactation milk productionin Angus and 70.741b in Simmentals. Positive correlations were .40 and .64 between Milk EPDand total milk produced per lactation and .24 and .49 between Milk EPD and calf weaningweight for Angus and Simmental, respectively. Milk EPDs can be used as genetic selectiontools to influence milk production levels and make corresponding changes in calf weaningweights.