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Halophyte forages originating from central Iranian deserts (Kochia scoparia, Atriplex dimorphostegia) were harvested at early bloom stage. The potential value of these forages occasionally is constrained by alteration of serum constituents and metabolic hormones of some ruminants. Nine Balouchi ewes (48±2 kg BW) were transferred to metabolism cages and randomly allocated to three dietary treatments [T 1: kochia + alfalfa (1:1), T 2: atriplex + alfalfa (1:1), T 3: alfalfa] in a Latin Square experiment with three periods (28 days periods). During the last 3 days of each period, samples of blood serum and urine were collected. There was no differences between treatments as serum levels of Mg and Na (P>0.05). Whereas, Serum Ca levels for T 1 (8.04 mg/dl) and T 2 (8.29 mg/dl) was lower (P<0.01) than that T 3 (9.19 mg/dl). Halophyte forages elevated serum cholesterol (P<0.01), thyroxine (P<0.001), and bilirubin (P<0.01). Ewes fed T 1 had the highest (P<0.01) blood serum activity of alanine aminotransferase (ALT) (34.8 U/l). The activity of Aspartate aminotransferase (AST) was increased in blood serum of ewes fed halophyte forages (P<0.05). The effect of treatments on blood serum glucose levels were different (P<0.05) and the linear relationship for the sampling time tend to be significant (P<0.08). The effect of treatments on blood serum urea N were completely different (P<0.0001), however there was no linear and quadratic relationship for the time of sampling. [ABSTRACT FROM AUTHOR]