Abou-Bakr, S., U. M. El-Saied, and M. A. M. Ibrahim,
"Genetic and phenotypic parameters for milk yield, days open and number of services per conception of Holstein cows of commercial herd in Egypt.",
Egyptian Journal of Animal Production, vol. 37, issue 1: Egyptian Society of Animal Production, pp. 9-17, 2000.
Abstractn/a