| Summary: | Serum glucose, total proteins, calcium and inorganic phosphorus were determined in estrual, pregnant, infertile and regular breeder mares, each group comprising of 10 animals. The mares were grouped on the basis of rectal examination, history and records. There was a significant (P<0.05) difference in the serum glucose levels between the pregnant and estrual mares, pregnant and regular breeder mares, infertile and regular breeder mares and between infertile and estrual mares. The highest values of serum glucose were recorded in regular breeder mares, whereas the lowest values were recorded in infertile mares. The highest values for total proteins were recorded in regular breeder mares and the lowest in pregnant mares, difference being significant (P<0.05) between the pregnant and estrual and pregnant and regular breeder mares. The highest values of serum calcium were recorded in estrual mares and lowest for regular breeder mares. There was a significant (P<0.05) difference between the estrual and pregnant mares, estrual and infertile mares and between estrual and regular breeder mares. The highest values of serum inorganic phosphorus were recorded for regular breeder mares whereas the lowest values were recorded in pregnant mares. The analysis of data indicated non significant (P>0.05) difference in the serum phosphorus levels among all the groups of mares.
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