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The aim of this study was investigate concentrations of blood plasma biochemical composition, minerals and progesterone on the day of estrus for buffalo cows in Minoufiya province in Egypt.
The current study was carried out in the veterinary units on 33 Egyptian buffalo cows that were chosen randomly on day of estrus and from 13 normal postpartum dairy buffalo cows (as a control group) that were chosen after about 6 to 12 h from parturition. In our study, initial blood samples were taken at the time of AI which was within the first 12 h between estrus and ovulation and hence all animals were at the same stage of the estrous cycle.
Concentrations of P4, CH and AL/GL ratio significantly (P<0.05) increased in normal cows than those in estrus but only G, TP, AL, and GL concentrations were significantly (P<0.05) higher in case of estrus than in normal. The normal plasma concentrations of Mg, Mn, Se, Fe, Mo, and Cd in buffalo cows were higher than in estrus day. On the other hand, the blood plasma concentrations of Na, K, Ca, P, Ca/P ratio, Co, Cu, and Zn were higher in estrus than normal.
Progesterone concentrations were higher on day of estrus in winter than in summer. All plasma macro elements were higher on day of estrus in winter than in summer except Ca, P and Ca/P ratio. On the other hand, all plasma macro elements were higher on day of estrus in winter than in summer except Zn, Mn, Se, and Fe.