Abstract
The diagnosis of early stage of pregnancy in cows is very important for veterinarians. We diagnosed a total of 204 cows raised at the dairy farms of Kanagawa, Chiba and Ibaraki Prefectures by using Doppler ultrasound pregnancy detector (Rectal doctor, Medata, England).
Experimental cows were divided into 5 groups according to their pregnant term (number of days after artificial insemination). The following results were obtained; the accuracy of diagnosis is 90.6% for 1-39 days, 92.5% for 40-59 days, 91.9% for 60-79 days, 94.5% for 80-149 days and 100% for over 150 days, respectively. The diagnosis of pregnant and non-pregnant cow is very easy with the use of this detector.
Therefore, we can conclude that Doppler type ultrasound pregnancy detector is a very useful instrument for diagnosis of early pregnancy in cows. This detector is very compact and easy to carry, moreover compared with the rectal palpation technique this method can shorten the time for diagnosis of pregnancy.
