Stress, reproduction; neuroendocrinology; environmental estrogens; immunocastration.
Protein metabolism; energy metabolism; homeorhesis; systems analysis.
Comparative biochemistry, physiology, and larval development of invertebrates.
Reproductive and developmental biology of fish; sturgeon aquaculture.
Conservation genetics, population genetics, immunogenetics, disease susceptibility genomics, disease ecology, forensic genetics. Free-ranging species of management concern in California. Threatened and endangered species. Carnivores, wild pigs, raptors (birds of prey) and corvids (magpies, crows, and relatives). Special interests in Yellow-billed Magpies, Swainson's Hawks, Mountain Lions.
Quantitative genetics and statistics; inheritance of disease in the dog.
Fish feeding, nutrition, biochemistry, and physiology.
Development of genetic tools for companion animals and analyzing inherited diseases in cats, dogs, horses and primates
Animal Genomics; molecular genetics; animal growth; milk composition.
Animal welfare and stress; environmental enrichment for intensively managed animals; social behaviors in domestic birds.
Photosexual stimulation and photorefractoriness; endocrine disruption; reproductive behavior of parrots
My present research program addresses the endocrine/paracrine/autocrine events in the mare, stallion, boar, elephant and other exotics that operate to initiate, sustain and regulate target organs. My approach is to investigate the role and mechanism of action of reproductive hormones on inducing a cellular response at the level of the pituitary, gonads and embryo. In addition, we are exploring the paracrine/autocrine system that modulates cellular responses. By understanding the control of normal reproductive events, it will then be possible to elucidate the basis of endocrine dysfunction associated with reproductive failure.
Our laboratory focuses on ruminant livestock production, across geographic locations and levels of biological organization. Projects range from examination of interactions among nutrition, genetics and physiological state, all the way to regional studies of environmental impacts of different production systems. Recently, a major emphasis has been on understanding the genetic and physiological mechanisms underlying variations in feed efficiency in beef cattle. This work requires in vivo experiments in conjunction with in silico modeling analyses. Mathematical modeling is used at all levels of biological and enterprise organization to identify critical areas of research, design appropriate experiments, and aid in interpretation of results.
Physiology and behavior focused on the welfare of agricultural animals including horses, in areas such as housing, transport, environment and handling. Research in refeeding and nutritional rehabilitation programs for starved horses and other animals.