A micrograph of a section Biceps Femoris (BF) from lamb drinking fresh water showing intact muscle fibers however Longsimus Dorssi (LD) and Triceps Brachii (TB) muscles from lamb drinking fresh water showing normal muscle fibers shape in the other hand A micrograph of a section Biceps Femoris muscle from lamb drinking saline water showing relative atrophy of muscle fibers while Longsimus Dorssi muscle from lamb drinking saline water showing relative hypertrophy of muscle fibers moreover Triceps Brachii muscle from lamb drinking saline water showing an elongation of muscle fibers and narrow of the thickness as compared with the normal one (H and E stain, Scale Bar: 200 µm).