Comparison of Ovarian Function and Circulating Steroids in Estrous Cycles of Holstein Heifers and Lactating Cows

Ovarian function was compared between nulliparous heifers (n=29; 10 to 16 mo old) and lactating Holstein cows (n=31; 55.9±3.5 d postpartum). Follicular dynamics, corpus luteum growth, and regression, and serum steroid concentrations were evaluated through ultrasonography and daily blood sampling. Mo...

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