Genetics and Breeding: Heritabilities of Teat End Shape and Teat Diameter And Their Relationships with somatic Cell Score

摘要

Teat end shapes were categorized for 1740 Holstein cows with 2261 lactations in nine herds. Frequencies of teat end shapes were pointed, 7/100; pointed disk, 1/100; round 43/100; round ring, 16/100; round flat, 5/100; round disk, 11/100; flat, 6/100; disk, 10/100; and inverted, 0.8/100. Teat diameters were measured 1.5 cm from the end of the teat. Teat end lesions were visually classified into four categories: no lesion, rough ring, very rough, and ulcer- ated, raw appearance. Repeatability estimates for teat end shape and teat diameter were 0.75 and 0.36, respec- tively.