Comparison of four methods of pregnancy diagnosis in ...



Title Comparison of four methods of pregnancy diagnosis in seasonal dairy herds in the Manawatu
Author(s) K. Mueller, Jeffrey Wichtel, N. B. Williamson
Journal Publication Veterinary Continuing Education, Massey University
Date 1998
Issue 184
Start page 263
End page 270
Abstract All cows in 6 spring-calving herds were examined for pregnancy using rectal palpation, real-time ultrasonography or enzyme immunoassay of milk samples for oestrone sulfate content [date not given]. A complete set of results was obtained from 2139 cows, of which 1906 (98.1%) were pregnant and 233 (10.9%) were non-pregnant. The sensitivity and specificity values for all cows were 100 and 93.2%, respectively, for rectal palpation, 99.9 and 96.6% for ultrasonography and 96.8 and 88.1% for oestrone sulfate. In a 2nd group of cattle, a milk sample was taken from all cows in 7 herds between 133 and 181 days after mating, oestrone sulfate content measured, and a list of pregnancy status obtained for each animal based on farmer's observations. Complete results were obtained for 975 animals, of which 877 (89.9%) were pregnant and 98 (10.1%) non-pregnant. Sensitivity and specificity values were 85.2 and 79.6%, respectively, for oestrone sulfate and 95.9 and 54.1%, respectively, for farmer's observation..

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