Authors : H. Hamali , S. Mosafery and A. Mohammadi
Abstract: Teat end hyperkeratosis is a very important problem which affects cows in the farms of Iran and many other countries. This disease mainly caused by the over milking and defects in the milking machine. In a survey focusing on the 4 large dairy Holstein herds at around of Tabriz (north-west of Iran), prevalence of teat end hyperkeratosis, was evaluated. In the herds of A (n = 300) and B (n = 160), cows were milked 3 times/day. In the herds of C (n = 162) and D (n = 190) cows were milked 2 times/day. Prevalence of the teat end hyperkeratosis in the herds of A and B were recorded as 63.38%. In the herds of B and C this prevalence was 24.86%. Also, according to the Wilson`s grading schedule the grades of 2 and 3 of hyperkeratosis more prevalent between the cows with 3 times milking/day, than cows with 2 times milking/day. Statistical analyses indicated significant differences between the herds of A and B (3 times milking/day) and herds of C and D (2 times milking/day). In conclusion, according to our results, significant relationship exists between the cow`s teat end hyperkeratosis and milking frequency/day.
H. Hamali , S. Mosafery and A. Mohammadi , 2008. A Survey of Teat End Hyperkeratosis Prevalence in the Tabriz Dairy Herds. Journal of Animal and Veterinary Advances, 7: 949-952.