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 We don't know much about this study yet. We're maintaining the world's largest resposity of hair loss research. You can help out the community by sending a PDF of this study here . Not sure how to get a study's PDF? You can email the authors of the study. View this study on avmajournals.avma.org →