S Lebedev, O Zavyalov, A Frolov - Veterinary World, 2022 - ncbi.nlm.nih.gov
Materials and Methods: The study was conducted on clinically healthy Hisex Brown laying
hens at the age of 10 (n= 150), 30 (n= 150), 120 (n= 150), 150 (n= 150), and 210 (n= 150) …