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Changes in the concentrations of LH subunit messenger ribonucleic acids (mRNAs) and in the LH content of the anterior pituitary of beef cattle were studied during the estrous cycle. Japanese beef cows were classified according to the expected day of the estrous cycle: stage I (early-luteal phase, days 1–4; day 1=day of ovulation), stage II (early-mid-luteal phase, days 5–10), stage III (late-mid-luteal...