A comparative study on some biological constituents in serum during normal and sub-oestrous cycles of crossbred cows of Asom

A total of ten normal cyclic and ten confirmed sub-oestrous cows yielding 10 – 20 liters of milk were selected at random for this study. Blood samples were collected from each animal on day 0, 5, 10, 15 and 20 (day 0 of the next cycle) and each sample was analyzed for estimation of calcium, inorganic phosphorus, sodium, potassium, total protein, glucose, cholesterol, alkaline phosphatase, iron, magnesium, copper and zinc by using quality kits when cobalt was determined with the help of Atomic Absorption Spectrophometer. The result revealed that the mean serum concentrations of sodium, iron, copper and zinc, glucose, cholesterol and alkaline phosphatase varied significantly (P< 0.01) whereas mean values of potassium, magnesium and cobalt varied significantly (P < 0.05) at different days of both ostrous cycles. On the other hand, all mean levels of the biological constituents did not vary between normal and sub-oestrous cycles of the present stdudy. However, the variation of all biological constituents in serum remained within normal physiological levels in both normal and suboestrous cycle of crossbred cows of the present study.