The book a new version of Medical Zoology published in late eighties deals with the basic issues in parasitology such as types, evolution of parasitism, hosts types and their interdependence, symbiotic relationships, concepts of susceptibility and host parasite specificity, immunity to parasitic infections, types of parasitic relationships in animals, adaptations to parasitism, important groups of parasites with particular reference to humans. It also covers the brief information about two infectious diseases; tuberculosis and typhoid fever. The life cycle of certain parasitic protozoans such as Entamobea, Giardia, Plasmodium and Trypansosoma., Parasitic helminths such as Echninococcus, Ancylostoma, Wuchereria bancrofti have been discussed, The book also includes information in certain topics of animals biotechnology such as gene transfer with particular reference to embryonic stem cells, artificial insemination in humans and cattle, animal cloning, stem cell technology, in vitro fertilisation and embryo transfer technique (IVF-ET), breeds of dairy cattle and their characteristics, transgenic animals and their uses. Besides these, topics on animal husbandry synchronisation of estrus, integrated animal farming have also been discussed. Attempts have been made to include discussion on poultry farming, principles of poultry culture, common breeds of poultry, management of breeding stocks and broilers, processing and preservation of eggs.Various issues concerning aquaculture such as; definition and scope of aquaculture, fishing gears, genetic improvement of aquaculture, induced breeding and transportation of fish seed, composite fish culture, prawn culture, pearl culture have also been discussed.