Early identification of non-pregnant and pregnant ewes in the field using circulating progesterone concentration |
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Authors: | RN Tyrrell AR Gleeson DA Peter PJ Connell |
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Institution: | 1. New South Wales Department of Agriculture, Division of Animal Production, Sydney, N.S.W. 2000. Australia;2. CSIRO, Division of Animal Production, Blacktown, N.S.W. 2148. Australia |
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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 log10p.In experiment 1, non-pregnant ewes and pregnant ewes (20 to 31 days post-mating) were diagnosed correctly (96.7% accuracy). In experiment 2, non-pregnant ews and pregnant ewes (21 to 34 days post-mating) were diagnosed correctly (95.5% accuracy). |
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