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SUMMARY This study was conducted to investigate the effect of zinc sulfate and zinc methionine supplementation on the digestion coefficients, nutritive value, ruminal and some blood parameters, milk yield and milk composition of Friesian dairy cows. Animals were fed according to the NRC feed allowances for dairy cattle (1989). Fifteen Friesian dairy cows were divided into three groups (five animal each). Animal were fed on the following rations: Control group fed concentrate feed mixture (CFM), berseem (Trifolium alexandrinum) hay and rice straw without zinc supplementation. The 1 st tested group was fed control ration + 40mg zinc sulfate /kg dry matter intake (DMI) and the 2 nd tested group was fed control ration +40mg zinc methionine /kg DMI. All groups were fed for a period from the expected calving date to 182 days of their lactation season. Results indicated that the addition of zinc improved the nutrient digestibilities and feeding values as TDN and DCP. Also, zinc supplements tended to reduce ammonia-N and somatic cell counts but increased TVFA's, improved feed efficiency and milk yield. Moreover, zinc supplementation improved serum total protein and globulin, but reduced the concentration of both albumin and urea in blood serum.

EFFECT OF TWO DIFFERENT SOURCES OF ZINC SUPPLEMENTATION ON PRODUCTIVE PERFORMANCE OF FRIESIAN DAIRY COWS