TY - JOUR T1 - Dietary Supplementation with Ferula Improves Productive Performance, Serum Levels of Reproductive Hormones, and Reproductive Gene Expression in Aged Laying Hens JO - Brazilian Journal of Poultry Science A1 - Hao, E A1 - Chang, LY A1 - Wang, DH A1 - Chen, YF A1 - Huang, RI A1 - Chen, H SN - 1516-635X UL - 10.1590/1806-9061-2020-1319 VL - 23 Y1 - 2021 PB - Brazil ER -