J Anim Sci Biotechnol. 2021 Nov 4;12(1):112.doi: 10.1186/s40104-021-00633-8.
2021-11-04J Anim Sci Biotechnol. 2021 Nov 4;12(1):112.doi: 10.1186/s40104-021-00633-8. Natural astaxanthin enhanced antioxidant capacity and improved semen quality through the MAPK/Nrf2 pathway in aging layer breeder roosters.