Author(s):

MI Yatoo, OR Parray, T Ashraf, S Ashraf, M Nisar and S Taifah

Abstract: To evaluate serum micromineral and hormone interaction in cattle, thirty crossbred cows from Holstein Friesian herd were selected and divided into three groups viz. dry, lactating and pregnant. Each group was having ten animals (n=10). Serum microminerals like copper (Cu), iron (Fe), zinc (Zn) and manganese (Mn) were estimated by atomic absorption spectrophotometry and serum hormones like oestrogen (E₂), progesterone (P₄), trioiodothyronine (T₃) and tetraiodothyronine (T₄) by radio immuno assay (RIA). Serum microminerals and hormone levels were in deficient range. Positive and significant (p<0.05) correlation was found between Zn, Mn and estrogen; Cu, Fe, Zn, Mn and progesterone. Positive and significant (p<0.05) correlation was found between Cu, Fe, Zn and T₃ and T_4. Significant (p<0.05) improvement in Cu, Fe, Zn and progesterone was noticed 30 days post mineral supplementation in pregnant cows and oestrogen in dry cows. Microminerals are involved in hormone synthesis and production and hence deficiency of microminerals causes hormonal imbalance thus affecting health and production.

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