In the past decade, animal scientists have learned that administering recombinantly derived somatotropin (growth hormone) to cows improves milk production and that giving beta-adrenergic agonists to meat animals improves productivity and leanness. In order for these metabolic modifiers to yield benefits, however, sound management of the animals' nutrition is necessary. This volume reports on how these substances work in the animals' metabolism, what effects they might have on nutrient requirements of domestic livestock, and what information should be developed further by investigators. The book explores the current understanding of the biology, structure, mechanisms of action, and treatment effects of somatotropin, beta-adrenergic agonists, and anabolic steroids. A companion volume to the Nutrient Requirements of Domestic Animals series, this authoritative volume will be required reading for animal scientists, researchers, veterinarians, livestock farmers, and faculty and students in university animal veterinary science programs.

Recent advances in biotechnology in areas as diverse as agriculture, the environment, food, and healthcare have led to much debate and media attention. This unique reference resource for advanced high school students and teachers explores the science behind these new technologies and examines the stakeholders and their stakes in the various debates. The author presents views of scientists, doctors, insurance companies, and big businesses, among others, on such issues as genetic testing, patenting of human gene sequences, cloning, and genetically engineered food. Each chapter addresses a specific issue with the goals of helping readers understand all the different ways biotechnology is being explored and implemented in our lives today, as well as to critically perceive the arguments being made concerning these issues. Students will learn there is more to biotechnology than cloning sheep, that it is also used for such purposes as making cheese and beer. Each topic is presented as a Case Study describing of a range of technologies and a diversity of stakeholders that will allow users to draw their own conclusions. This introduction to the technologies and the debates surrounding them also encourages students to take advantage of the many available sources for further research, particularly on the Internet.

Health Sciences & Nutrition