The objective ofthis study was to evaluate the reproductive performance of ewes supplementedwith organic or common mineral salt in the breeding season, and the effect onmetabolic constituents of the blood. The experiment was carried out from November2005 to May 2006 using 40 Ile de France breed ewes. During the breeding season,sheep grazed on two native pasture areas of 15 ha each and were distributedin two groups, depending on the supplementation: submitted to treatments: receivingonly mineral mix (salt+phosphate) and receiving organic salt. Biochemical indicatorsof the nutritional status were analyzed by quantifying the serum albumin, urea,glucose, cholesterol and triglycerides of the blood serum. Ewes fed organicmineral had a higher rate of serum urea nitrogen than ewes that received saltin the traditional form (39.00 vs. 35.69 mg/dL, respectively). The others biochemicalcomponents evaluated did not differ between treatments. The albumin, urea, glucoseand cholesterol serum values differed between the evaluated periods during thebreeding season. Serum albumin and urea nitrogen values did not influence thebirth rate. Supplementation with organic salt do not improve the reproductiveperformance of ewes in the breeding season.
