The Thai Journal of Veterinary Medicine


Normal values of serum Ca, P and ALP in horses in relation to age, breed and environment were studied. Mean serum Ca, Р and ALP in mixed breed horses, age 1 to 6 years were 11.80 ± 1.25, 3.29 ± 0.65 and 7.76 ±2.31, age 7 to 12 years were 12.10 ±0.99, 2.84 ± 0.66 and 6.06± 1.46 respectively. Serum ALP activity of thoroughbreds and ponies were not significant different from that of mixed breed. The differences in P concentration among breeds were significant. A wide range of serum ALP activity was observed among horses raised in different areas. The ALP values of race horses were lower than others. Increased levels of P and ALP and decreased level of Ca were found in horses with osteomalacia. These values were in the opposite direction in the treated horses. There was no relation between the increased ALP values and decreased bone density.

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