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  • Title: Early pregnancy diagnosis in the ewe, based on milk progesterone levels.
    Author: Shemesh M, Ayalon N, Mazor T.
    Journal: J Reprod Fertil; 1979 May; 56(1):301-4. PubMed ID: 469853.
    Abstract:
    Plasma and milk progesterone concentrations in pregnant sheep (18--22 days after mating) were similar, about 3.7 ng/ml whereas values in non-pregnant sheep were less than 1 ng/ml. Lambing results indicated identical accuracy for both methods (82 and 84% in 2 flocks). The accuracy was 92--100% for ewes diagnosed non-pregnant in the breeding season, but for ewes tested in the non-breeding season the diagnosis of non-pregnancy according to milk progesterone levels was only 50% accurate.
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