Abstract
A method for early indentification of non-pregnant and pregnant ewes is described. It is applicable to field research situations where mating data for individual ewes cannot be collected and requires three plasma progesterone measurements from each ewe over a 12-days period. Ewes were diagnosed non-pregnant according to whether their lowest progesterone concentration ( p) was below or above a “discriminatory value”. This value was chosen after examining the overall frequency distribution of values of log 10 p. In experiment 1, 25 27 non-pregnant ewes and 64 65 pregnant ewes (20 to 31 days post-mating) were diagnosed correctly (96.7% accuracy). In experiment 2, 40 41 non-pregnant ews and 45 48 pregnant ewes (21 to 34 days post-mating) were diagnosed correctly (95.5% accuracy).
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