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Accuracy rate of early pregnancy diagnosis in Holstein heifers by transrectal ultrasonography using 7.5MHz linear array transducer

Younes Moharrami, Vahid Khodabandehlo, Mohammad Reza Ayubi and Samad Mosaferi

Pregnancy diagnosis and managements on it is one of the things that have always been a problem. Checking the accuracy of pregnancy diagnosis with ultrasound in cows can also be a useful step in this area. The pregnancy diagnosis in cows by ultrasound is used in two ways: one method is Transcutaneous ultrasound and the second method is Trans-rectal ultrasound using prop linear. Prop linear is a long rectangular bar that sends signals linearly. It is a soild-state transducer that contains a row of array supersonic crystals which are shot electronically in a row and form a rectangular image. The method is that the tail is raised and a prop is inserted in the rectum to animals. The researcher went to a cow keepery in Tabriz with 1000 cows to do pregnancy diagnosis by ultrasound in cows. The total number of cows under ultrasound was 150 vertexes which were placed in three groups of 50 vertexes. The first group 24 days after insemination, the second group 26 days after insemination and the third group 28 days after insemination performed pregnancy diagnosis by ultrasound 7.5 MHz. By analyzing the results, the best time for pregnancy diagnosis with the prop 7.5 MHz was reported 26 days after insemination.