Yunus Samandarovich Ruziev and Shokhzod Shermatovich Khudoyberdiev 2021. THE PRODUCTIVITY AND DIGESTIBILITY OF HEN’S BREEDS SPECIALIZED IN THEIR EGGS AND ITS EFFECT ON SOME PHYSIOLOGICAL PARAMETERS WHEN THEY CONSUME SAND. International Engineering Journal For Research & Development. 6, 2 (Jun. 2021), 5. DOI:https://doi.org/10.17605/OSF.IO/BW2JT.