Seasonal variations in blood biochemistry in normal and anoestrus buffalo-cows

ABSTRACT

Investigations were carried out on 13 Egyptian buffalo-cows raised at national research center experimental farm. Blood samples were collected from cyclic animals on the day of oestrus and day 10-14 following oestrus, during the mid of the four seasons of the year as well as from 5 of these buffalo-cows suffering from anoestrus during summer. Plasma was assayed for progesterone [RIA] and some biochemical values. Progesterone, total protein, albumin, inorganic phoshorus, Ca/P, magnesium, copper and cholesterol values revealed significant seasonal changes during both oestrus and lutealphases of the oestrous cycle. On the other hand Ca/P ratio varied [p<0.01]during oestrus and albumin/ globulin and zinc varied [p<0.01] during luteal phase among the different seasons of the year. Moreover, these studies indicated that buffalo-cows suffering from summer anoestrus had a marked lower total protein, albumin, inorganic phosphorus, magnesium and progesterone as compared with normal cyclic animals during the same season of the year