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Full-Text Articles in Life Sciences
Distribution Of Antiherbivory Compounds In Flourensia Cernua, Ed Frederickson, Richard Estell, James Darren, Dean Anderson
Distribution Of Antiherbivory Compounds In Flourensia Cernua, Ed Frederickson, Richard Estell, James Darren, Dean Anderson
Ed L. Frederickson
Flourensia cernua is serving as a shrub model to study the influence of terpenes on intake by livestock at this location. Two studies (n=20 plants per study) were conducted to examine within plant distribution of volatile compounds to improve sampling protocol. Leaves from 3 positions (outer canopy, subcanopy, and basal) were collected from 4 quadrants (based on ordinal direction) in Exp. 1. Leaves were removed from 2 leaders of current year's growth for each position in each quadrant. In Exp. 2, 10 leaders of current year's growth were collected from the outer canopy in each quadrant and 3 leaf age …
Characterizing Foraging Patterns Among Cattle And Bonded And Non-Bonded Small Ruminants Using Spatial Point Process Techniques, Ed Frederickson, Dean Anderson, Leigh Murray, Peixn Sun, Richard Estell
Characterizing Foraging Patterns Among Cattle And Bonded And Non-Bonded Small Ruminants Using Spatial Point Process Techniques, Ed Frederickson, Dean Anderson, Leigh Murray, Peixn Sun, Richard Estell
Ed L. Frederickson
Two mixed-species livestock groups were monitored while foraging on 410 ha of brush-infested Southern New Mexico rangeland during July and August 1988. The groups consisted of crossbred Bos taurus and Bos indicus beef cattle with white-faced sheep (Ovis aries) and mohair goats (Capra hircus). The bonded group consisted of small ruminants that had their behaviours modified through socialization with cattle to form a flerd in which small ruminants consistently remained near cattle. Small ruminants in the non-bonded group had not been socialized with cattle. A subset of animal location data measured during the morning over five days for both the …
Local Good Governance Of Rural Infrastructure Development Planning: Case Studies Of Commune Councils In Cambodia, Sophal Ear
Sophal Ear
No abstract provided.
Dust Emissions From Undisturbed And Disturbed, Crusted Playa Surfaces: Cattle Trampling Effects, Ed Frederickson, Teddy Zobeck, Robert Van Pelt, Matthew Baddock
Dust Emissions From Undisturbed And Disturbed, Crusted Playa Surfaces: Cattle Trampling Effects, Ed Frederickson, Teddy Zobeck, Robert Van Pelt, Matthew Baddock
Ed L. Frederickson
Dry playa lake beds can be significant sources of fine dust emission. This study used a portable field wind tunnel to quantify the PM10 emissions from a bare, fine-textured playa surface located in the far northern Chihuahua Desert. The natural, undisturbed crust and its subjection to two levels of animal disturbance (one and ten cow passes) were tested. The wind tunnel generated dust emissions under controlled conditions for firstly an initial blow-off of the surface, followed by two longer runs with sand added to the flow as an abrader material. Dust was measured using a GRIMM particle monitor. For the …