Yunus Samandarovich Ruziev and Shokhzod Shermatovich Khudoyberdiev, “THE PRODUCTIVITY AND DIGESTIBILITY OF HEN’S BREEDS SPECIALIZED IN THEIR EGGS AND ITS EFFECT ON SOME PHYSIOLOGICAL PARAMETERS WHEN THEY CONSUME SAND”, IEJRD - International Multidisciplinary Journal, vol. 6, no. 2, p. 5, Jun. 2021.