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Full-Text Articles in Animal Sciences
Perches As Cooling Devices For Reducing Heat Stress In Caged Laying Hens: A Review, Jiaying Hu, Yijie Xiong
Perches As Cooling Devices For Reducing Heat Stress In Caged Laying Hens: A Review, Jiaying Hu, Yijie Xiong
Department of Animal Science: Faculty Publications
Heat stress is one of the most detrimental environmental challenges affecting the biological process and the related production performance of farm animals, especially in poultry. Commercial laying hens have been bred (selected) for high egg production, resulting in increased sensitivity to heat stress due to breeding-linked metabolic heat production. In addition, laying hens are prone to heat stress due to their inadequate species-specific cooling mechanisms resulting in low heat tolerance. In addition, hens have no sweat glands and feathering covers almost their entire body to minimize body heat loss. The poultry industry and scientists are developing cooling methods to prevent …
Cooled Perch Effects On Performance And Well-Being Traits In Caged White Leghorn Hens, J Y. Hu, P Y. Hester, M M. Makagon, G Vezzoli, R S. Gates, Y Xiong, H W. Cheng
Cooled Perch Effects On Performance And Well-Being Traits In Caged White Leghorn Hens, J Y. Hu, P Y. Hester, M M. Makagon, G Vezzoli, R S. Gates, Y Xiong, H W. Cheng
Department of Animal Science: Faculty Publications
We assessed the effects of chilled water cooling perches on hen performance and physiological and behavioral parameters under “natural” high temperatures during the 2013 summer with a 4-hour acute heating episode. White Leghorns at 16 wk of age (N = 162) were randomly assigned to 18 cages (n = 9) arranged into 3 units. Each unit was assigned to one of the 3 treatments through 32 wk of age: 1) cooled perches, 2) air perches, and 3) no perches. Chilled water (10◦C) was circulated through the cooled perches when cage ambient temperature exceeded 25◦C. At the age of …
Use Of Modified Cages Attached To Growing Calves To Measure The Effect Of Stable Flies On Dry Matter Intake And Digestibility, And Defensive Movements, L. A. Schole, D. B. Taylor, D. R. Brink, K. J. Hanford
Use Of Modified Cages Attached To Growing Calves To Measure The Effect Of Stable Flies On Dry Matter Intake And Digestibility, And Defensive Movements, L. A. Schole, D. B. Taylor, D. R. Brink, K. J. Hanford
Department of Animal Science: Faculty Publications
The effects of stable flies on growing calves were examined using fly cages attached to the animals. Dry matter intake, DM digestibility (DMD), and behavioral responses of calves were monitored. Nine Holstein calves were exposed to 3 levels of stable flies (0, 10, 100 flies/animal) 3 times daily for 30 min. The study consisted of a 4-period crossover design; each period included 5-d adaptation, 7-d exposure, and 5-d postexposure. Calves were weighed at the beginning and end of each period. Feed consumption was continuously recorded. Fecal samples taken during and after exposure were used to determine DMD. Three calves were …
A General Review Of Competition Genetic Effects With An Emphasis On Swine Breeding, C. Y. Chen, Rodger K. Morota, S. Newman, L. D. Van Vleck
A General Review Of Competition Genetic Effects With An Emphasis On Swine Breeding, C. Y. Chen, Rodger K. Morota, S. Newman, L. D. Van Vleck
Department of Animal Science: Faculty Publications
A review of previous studies is presented on estimates of genetic parameters and responses to selection with traditional breeding approaches, on correlations between agonistic behavior and growth performance, and on theoretical frameworks for selection incorporating interactions among individuals and on practical methods for incorporating competition effects in breeding programs.
Estimates Of Genetic Parameters For Feed Intake, Feeding Behavior, And Daily Gain In Composite Ram Lambs, K. M. Cammack, Kreg A. Leymaster, T. G. Jenkins, Merlyn K. Nielsen
Estimates Of Genetic Parameters For Feed Intake, Feeding Behavior, And Daily Gain In Composite Ram Lambs, K. M. Cammack, Kreg A. Leymaster, T. G. Jenkins, Merlyn K. Nielsen
Department of Animal Science: Faculty Publications
Our objective was to estimate genetic parameters for feed intake, feeding behavior, and ADG in composite ram lambs (¹⁄₂ Columbia, ¹⁄₄ Hampshire, ¹⁄₄ Suffolk). Data were collected from 1986 to 1997 on 1,239 ram lambs from approximately 11 to 17 wk of age at the U.S. Meat Animal Research Center near Clay Center, NE. Feeding equipment consisted of an elevated pen with an entrance chute that permitted access to the feeder by only one ram lamb at a time, with disappearance of feed measured by an electronic weighing system. Ram lambs were grouped 11 per pen from 1986 to 1989, …
Effect Of Animal Grouping On Feeding Behavior And Intake Of Dairy Cattle, R. J. Grant, J. L. Albright
Effect Of Animal Grouping On Feeding Behavior And Intake Of Dairy Cattle, R. J. Grant, J. L. Albright
Department of Animal Science: Faculty Publications
Although data are scarce, it is clear that grouping strategy can have a significant impact on the feeding behavior and feed intake of dairy cattle. Feed intake is controlled by ruminoreticular fill and physiological mechanisms, but grouping is a component of the cow’s feeding environment that can modulate intake as a result of its impact on cow comfort, competition for feed and other resources, and herd health. Social dominance and competition for feed impact feeding behavior and proper grouping strategy will minimize the negative impact of excessive competition on intake and enhance beneficial effects of group feeding such as social …