@article{Jitjumnong_Sudwan_Maktrirat_Yama_Pirokad_U-krit_Moonmanee_2019, title={Additional Growth of Dominant Follicle During Synchronized Ovulatory Cycle Affects Ovulatory Follicle Size, Corpus Luteum Parameters, and Progesterone Level in Northern Thai Native Cattle}, volume={24}, url={https://ph02.tci-thaijo.org/index.php/SciTechAsia/article/view/153707}, abstractNote={<p>The aim of this research was to evaluate the additional growth rate of dominant follicle (DF) using a pregnant mare’s serum gonadotropin (PMSG) in a 7-day progesterone (P<sub>4</sub>)-gonadotropin releasing hormone (GnRH)-based program on follicular development and luteal function in White Lamphun cows. Cows in the PMSG-treated group (n=10) received PMSG on day of a P<sub>4</sub> device removal (on Day 7) in 7-day P<sub>4</sub>-GnRH-based program, while cows in the PMSG-untreated group (n=10) did not receive PMSG treatment. Ultrasonography was used to scan ovaries to determine development of ovulatory follicle (OF) and formation of corpus luteum (CL). Blood samples were collected to examine P<sub>4</sub> concentration. The OF diameter and CL parameters (size, area, and volume) were greater in the PMSG-treated cows than in the PMSG-untreated cows (P < 0.05). Ten days after ovulation, the greatest P<sub>4</sub> concentration was found in the PMSG-treated group (P < 0.05). In conclusion, additional growth rate of DF using PMSG in 7-day P<sub>4</sub>-GnRH-based program results in increase in OF development, CL parameters, and greater P<sub>4</sub> concentration in White Lamphun cows.</p>}, number={4}, journal={Science & Technology Asia}, author={Jitjumnong, Jakree and Sudwan, Paiwan and Maktrirat, Raktham and Yama, Punnawut and Pirokad, Wilasinee and U-krit, Warittha and Moonmanee, Tossapol}, year={2019}, month={Oct.}, pages={83–93} }