Some physiological aspects of repeat breeding in Holstein Friesians and its improvement under Egyptian environment.

Abstract

The serum albumin concentration and the albumin-globulin ratio had a significant effect on the rate of repeat breeding. In repeat breeders, low concentrations were found of albumin, progesterone, phosphorus, zinc, and glucose. The glycogen content of the cervical mucus was significantly lower in the repeat breeders. Treating repeat breeders with prostaglandin F2 alpha had positive effects on the parameter values.