Early pregnancy diagnosis by transrectal ultrasonography in dairy cattle.

  title={Early pregnancy diagnosis by transrectal ultrasonography in dairy cattle.},
  author={Juan E Romano and James W G Thompson and David W. Forrest and Mark E Westhusin and Michael A Tomaszweski and Duane C. Kraemer},
  volume={66 4},
The objective of the present study was to determine differences in time of detection of pregnancy between heifers and cows and the interval after insemination at which the maximum sensitivity and negative predictive value of transrectal ultrasonography were obtained. One-thousand-four-hundred transrectal ultrasonographies (TRUS-1; 1,079 in cows and 321 in heifers) were performed using a 5-MHz linear-array transducer. The cattle were randomly assigned to have TRUS performed once between days 24… CONTINUE READING

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