Fertilization in mammals normally occUrs within the oviduct, where it is relatively inaccessible to study. However, as a result of painstaking research, most of it carried out over the last five years, this barrier to experimentation has been largely overcome by the development of in vitro fertilization techniques for at least 11 different species, including man. The result has been a rapid increase in our knowledge of the physiological and bio chemical mechanisms involved in the fertilization process. The aim of this book, which is an extension of my recent review of cell surface interactions in fertilization (Gwatkin, 1976), is to present a brief, but well documented, account of the new knowledge that has been attained. Although this book deals with mammalian fertilization mechanisms, I have included some recent experiments on am phibian and invertebrate gametes to supplement the mammalian picture. This information is particularly valuable as the rela tively large number of eggs available from these lower forms has advanced our knowledge of certain fertilization mechanisms beyond what is known in mammals. However, in the interest of brevity, I have omitted details of morphology and minor varia tions between species. For these, and other aspects not covered here, the reader is referred to the books of Austin (1965, 1968), vii viii PREFACE Austin and Short (1972), Metz and Monroy (1969), Monroy (1965), Lord Rothschild (1956a), and Zamboni (l971a).

In a world increasingly dominated by human beings, the survival of other species becomes more and more questionable. In this brilliant book, Paul Shepard offers a provocative alternative to an "us or them" mentality, proposing that other species are integral to humanity's evolution and exist at the core of our imagination. This trait, he argues, compels us to think of animals in order to be human. Without other living species by which to measure ourselves, Shepard warns, we would be less mature, care less for and be more careless of all life, including our own kind.

The Waltham Book of Human-Animal Interaction: Benefits and Responsibilities of Pet Ownership discusses the scientific study of the relationship between man and animals, focusing on the behavior of companion animals, and how humans and animals affect each other's behavior. This first half of this book discusses research on benefits that have been found to accumulate from associations with animals, and the role of animals in care and therapy program. The responsibilities toward the animals kept, and how to enhance their care and welfare are considered in the next chapters. The human response to pet loss is also elaborated. This publication is beneficial to veterinary students and individuals concerned with the study of human-animal interactions.

Animals and Human Society provides a solid, scientific, research-based background to advance understanding of how animals impact humans. Animals have had profound effects on people from the earliest times, ranging from zoonotic diseases, to the global impact of livestock, poultry and fish production, to the influences of human-associated animals on the environment (on extinctions, air and water pollution, greenhouse gases, etc.), to the importance of animals in human evolution and hunter -gatherer communities.As a resource for both science and non-science, Animals and Human Society can be used as a text for courses in Animals and Human Society or Animal Science, or as supplemental material for Introduction to Animal Science. It offers foundational background to those who may have little background in animal agriculture and have focused interest on companion animals and horses. The work introduces livestock production (including poultry and aquaculture) but also includes coverage of companion and lab animals. In addition, animal behavior and animal perception are covered.Animals and Human Society is likewise an excellent resource for researchers, academics, or students newly entering a related field or coming from another discipline and needing foundational information, as well as interested laypersons looking to augment their knowledge on the many impacts of animals in human society. - Features research-based and pedagogically sound content, with learning goals and textboxes to provide key information - Challenges readers to consider issues based on facts rather than polemics - Poses ethical questions and raises overall societal impacts - Balances traditional animal science with companion animals, animal biology, zoonotic diseases, animal products, environmental impacts and all aspects of human/animal interaction

Contents: Introduction, Reproductive Organs, Gametogenesis, Fertilization, Parthenogenesis, Cleavage and Blastulation, Gastrulation, Development of Simple Ascidian, Development of Amphioxus, Development of Frog, Development of Chick, Development of Rabbit, Human Development, Placentation in Mammals, Extra Embryonic Membranes or Foetal Membranes, Embryonic Induction.