Rangeland: Fish and Wildlife Effects
209
790. Willow flycatcher and yellow warbler response to
cattle grazing.
Taylor, D. M. and Littlefield, C. D.
American Birds 40(5): 1169-1173. (1986)
NAL Call #: QL671.A32; ISSN: 0004-7686
Descriptors: Empidonax traillii/ Dendroica petechia/ human
activity/ habitat protection
© The Thomson Corporation
Plant Ecology, Biodiversity, and Other Environmental Effects
791. 14 vs. 42-paddock rotational grazing aboveground
biomass dynamics forage production and harvest
efficiency.
Heitschmidt, R. K.; Dowhower, S. L.; and Walker, J. W.
Journal of Range Management 40(3): 216-223. (1987)
NAL Call #: 60.18 J82; ISSN: 0022-409X
http://jrm.library.arizona.edu/data/1987/403/6heit.pdf
Descriptors: cattle/ Texas/ USA/ stocking densities/
growing season
Abstract: Research was initiated at the Texas Experimental
Ranch in 1981 to quantify the effects of 2 stocking
densities, equivalent to 14- and 42-paddock rotational
grazing (RG) treatments, on aboveground biomass
dynamics, aboveground net primary production (ANPP),
and harvest efficiency of forage. Baseline data were
collected in 1981 from 3 adjacent 30-ha paddocks in a 14-
paddock, cell designed RG treatment. Near the beginning
of the 1982 growing season the center paddock was
subdivided into three, 10-ha paddocks to establish the RG-
42 treatment. Stocking densities in the 14- and 42-paddock
treatments were 4.2 and 12.5 AU/ha, respectively, from
March 1982 to June 1984 and 3.0 and 9.1 AU/ha from June
to November 1984. During 1981, estimated ANPP in the
two RG-14 paddocks averaged 4,088 kg/ha as compared to
5,762 in the single RG-42 paddock. Following subdivision,
ANPP in the RG-14 paddocks averaged 2,533 kg/ha as
compared to 2,670 kg/ha in the RG-42 paddocks. Although
ANPP varied significantly among the 4 years of the study it
was not affected by density treatment. Likewise, harvest
efficiency varied among years but was unaffected by
density treatment. Average harvest efficiency ove