[ 14 ] reported a decreasing trend in conception rate when the blood E 2 /P 4 ratio was ≥ 1.0 on Days 6 and 7 post-estrus in beef cows subjected to ET.
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Relationship between ovarian ultrasonographic findings on the seventh post-estrus day and plasma progesterone concentration, nutritional metabolic factors, and pregnancy outcome in dairy cows.
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