ASSESSMENT OF GENETIC VARIABILITY AMONG FAYOUMI, RHODE ISLAND RED AND THEIR CROSSES USING RAPD-PCR Effect of genetic variations in BMP 4 gene (exon 2 plus part of intron 2) on infertility in Egyptian Buffaloes Polymorphisms of the Bovine Bone Morphogenetic Protein 7 Gene (BMP7) and its association with infertility in Egyptian Water Buffaloes