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Reproductive Energetics Of Adult Male Yellow- Bellied Marmots (Marmota Flaviventris), Carmen M. Salsbury, K. B. Armitage
Reproductive Energetics Of Adult Male Yellow- Bellied Marmots (Marmota Flaviventris), Carmen M. Salsbury, K. B. Armitage
Scholarship and Professional Work - LAS
We examined the energy expenditure of adult male yellow-bellied marmots and its relationship to various female-defense characteristics critical to male reproductive success. Resting metabolic rates of males were estimated in the laboratory via oxygen-consumption analysis, and field metabolic rates were estimated using a doubly Labeled water technique. Male home-range size, number of females defended by males, dispersion of females in the habitat, and date into the active season were considered to be predictors of male energy expenditure in excess of maintenance costs (field metabolic rate minus resting metabolic rate). Energy expenditure was best explained by a defensibility index based on …
Ec94-219 1995 Nebraska Swine Report, Rodger K. Johnson
Ec94-219 1995 Nebraska Swine Report, Rodger K. Johnson
University of Nebraska-Lincoln Extension: Historical Materials
The 1995 Nebraska Swine Report was prepared by the staff in Animal Science and cooperating Departments for use in Extension, Teaching and Research programs. This publications deals with research on swine reproduction, breeding, health, nutrition, economics, and housing.
1995 Nebraska Swine Report, Rodger K. Johnson
1995 Nebraska Swine Report, Rodger K. Johnson
University of Nebraska-Lincoln Extension: Historical Materials
This publication was prepared by the staff in Animal Science and cooperating Departments for use inExtension, Teaching and Research programs. It deals with the results that were done in reproduction, breeding, health, nutrition, economics and housing of swine.
G95-1235 Growth Implants On Beef Heifer Reproduction, Gene H. Deutscher
G95-1235 Growth Implants On Beef Heifer Reproduction, Gene H. Deutscher
University of Nebraska-Lincoln Extension: Historical Materials
This guide discusses the benefits and concerns in the use of growth implants with beef heifers. Growth promoting implants are used extensively in beef cattle finishing programs and in suckling and growing steer programs. Implants are one of the most economical means of improving performance. However, producers are concerned with implanting suckling and growing heifers because of the possible negative effects on subsequent reproduction of heifers selected as replacements. Replacement heifers need to grow rapidly, reach puberty early, conceive early, and increase in skeletal structure to reduce calving difficulty. If implants could be used to increase growth and skeletal structure …