MONITORING POSTPARTUM PLASMA PROFILE OF CERTAIN MACRO-AND MICRO-MINERALS IN FERTILE AND INFERTILE HOLSTEIN FRIESIAN COWS UNDER TROPICAL CLIMATE

摘要

Twenty-four freshly calved HF cows of University farm were monitored through clinical diagnosis andweekly plasma profile of certain macro and micro minerals from the day of calving till 21st week postpartum.The data were compared over the weeks and between conceived and non-conceived cows over thatperiod. The overall weakly mean plasma calcium levels of HF cows varied significantly between differentweeks postpartum with the lowest value at calving and highest at 6th-7th and 12th-13th week postpartum, butnot the phosphorus. However, the calcium (avg. 7.94 +- 0.06 mg/dl) and inorganic phosphorus (av. 6.677 +-0.05 mg/dl) concentrations in conceived and non-conceived groups, including the weekly profile did notdiffer significantly between weeks or between groups at any of the intervals postpartum. The Ca : P ratio ofconceived, non-conceived and their pooled groups was relatively low during early postpartum period andit varied insignificantly between different weeks from 1.07 +- 0.05 to 1.36 +- 0.09, with the overall mean of1.21 +- 0.01. The weekly magnesium concentration in conceived, non-conceived and their pooled groupsdid not vary significantly between different weeks postpartum (2.56 +- 0.15 to 3.32 +- 0.32 mEq/L), but theconceived group had significantly lower overall mean level than non-conceived group (2.83 +- 0.05 vs 3.14+- 0.04 mEq/L). The weekly zinc profile of conceived and non-conceived cows varied significantly betweendifferent weeks postpartum from 0.78 +- 0.11 to 1.24 +- 0.13 ppm, but not of pooled group. The iron (116 +-0.24 to 2.38 +- 0.20 ppm) and copper (0.66 +- 0.05 to 1.04 +- 0.14 ppm) concentrations of conceived, non-conceived and pooled groups neither varied significantly between different weeks postpartum nor betweengroups at any of the intervals postpartum, except for copper in conceived group which varied significantlybetween weeks postpartum, and it was higher than in the non-conceived group. The plasma cobalt andmanganese profile in conceived, non-conceived and their pooled groups varied insignificantly betweendifferent weeks postpartum (from 0.29 +- 0.04 to 0.55 +- 0.05 and 0.05 +- 0.01 to 0.12 +- 0.03ppm), except thatcobalt concentration was significantly lower at 7th, 9th and 16th week postpartum and manganese at 2nd, 6thand 18th week postpartum, in conceived than in the non-conceived group.