Estrus, Ovulation, and Serum Progesterone, Estradiol, and LH Concentrations in Mares After an Increased Photoperiod During Winter

    February 1977 in “ American Journal of Veterinary Research ”
    W. D. Oxender, P. A. Noden, H. D. Hafs
    Studysummary This study concluded that exposing anestrous brood mares to a 16-hour photoperiod in early December led to endocrinologically normal estrous cycles starting within two months, enabling earlier breeding and foaling.
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