@article{Bernardi_Roca_Marini_Ludueña_Marini_2017, title={Characterization of the Preovulatory Period in Dairy Cows}, volume={5}, url={https://www.ajouronline.com/index.php/AJAFS/article/view/4795}, abstractNote={<span lang="EN-US">The periovulatory period of productive Holstein cows was studied, through their hormone levels, ovarian dynamic, characteristics of the cervical flow and their behavior; observed and registered throughout two consecutive periods. Results showed that during ovulation, the most evident changes were: animal behaviour (from being restless and unquiet to being quieter and allow to be mounted); the reduction of the size of their vulva together with a loss of the labia turgidity; a decrease in the quantity of flow and this one appeared as a transparent and noticeable secretion, one which kept the vulva humid and lubricated. The pH of the flow got higher (7-20- 7.50) and the degree of crystallization was reduced to 1.5-2, among the kinds of estrogenic flow, ovulation coincided with the presence of certain arrangements corresponding to type S3, P2 and P6. P flow is associated to the time of maximum fertility. The peak of the luteinizing hormone was detected on the ovulation day (1.90mUI/mL) and 24 hours afterwards the level was low; estrogens increased on the preovulatory days (0.80-0.97 pg/mL) causing the sexual behaviour, the stimulating follicle hormone accompanied the follicular growth and progesterone reached its highest increase consistent with the establishment of the corpus luteum (1.45ng/mL). The vulvar characteristics and the analysis of the cervical flow become complementary tools in order to determine the ideal moment for insemination.</span>}, number={3}, journal={Asian Journal of Agriculture and Food Sciences}, author={Bernardi, Sandra Fabiana and Roca, Manuel Alejandro and Marini, Agustin and Ludueña, Ricardo and Marini, Pablo Roberto}, year={2017}, month={Jun.} }