نتایج جستجو برای: open grazing

تعداد نتایج: 408252  

2015
Maria Karatassiou Paraskevi Sklavou Zoi Parissi Georgia Galidaki Anna Sidiropoulou

Routes of transhumance movement as well as both summer and winter destinations are subjected to intense grazing that over the years may shape landscapes. The aim of this study was to investigate land use changes in Aspropotamos area, Trikala from 1985 to 2000 that serves as a summer destination of transhumance flocks. Changes in land cover were explored with the post classification comparison a...

2002
ALEXANDER S. FLECKER BRAD W. TAYLOR EMILY S. BERNHARDT JAMES M. HOOD WILLIAM K. CORNWELL SHAWN R. CASSATT MICHAEL J. VANNI NAOMI S. ALTMAN

Ecologists have long been interested in understanding the strengths of consumer and resource limitation in influencing communities. Here we ask three questions concerning the relative importance of nutrients and grazing fishes to primary producers of a tropical Andean stream: (1) Are stream algae nutrient limited? (2) Are top-down and bottom-up forces of dual importance in limiting primary prod...

2011
Heidi Paltto Anna Nordberg Björn Nordén Tord Snäll

Wooded pastures with ancient trees were formerly abundant throughout Europe, but during the last century, grazing has largely been abandoned often resulting in dense forests. Ancient trees constitute habitat for many declining and threatened species, but the effects of secondary woodland on the biodiversity associated with these trees are largely unknown. We tested for difference in species ric...

2011
J. L. Beck R. D. Mealor B. W. Hess G. E. Moss S. L. Lake

Changes in commodity pricing and environmental concerns are changing animal agriculture throughout the United States. Adopting multispecies grazing as an alternative production system could result in improved forage utilization, increased animal performance, and reduced production costs, and thereby improve the financial stability of livestock operations. This study focused on the Silver Spur R...

ژورنال: مرتع 2021
Akbarloo, Moosa, Barani, Hossein, Darvishi, Leila, Ghelichnia, Hassan,

Attention to the quality and quantity of forage plants, palatability and species preference, are among the information needed to properly manage pasture grazing. One of the prominent plants in the Nour Rud rangelands are Allium spp plants that have an acceptable distribution in the area. For the sake of the study, the preferred value of different species of Allium’s for Shal sheep with an avera...

2006
Temuulen Tsagaan Sankey Cliff Montagne Lisa Graumlich Rick Lawrence Jerry Nielsen

We studied five lower forest–grassland ecotones in the Darhad Valley in northern Mongolia and investigated the effects of 20th Century grazing regimes and changes in grazing management on ecotone dynamics at a local scale. A total of 2968 Siberian larch (Larix sibirica) trees were cored and tree-age distribution was constructed to determine 20th Century tree establishment. Tree age and location...

1998
JOHN W. WALKER RODNEY K. HEITSCHMIDT

Research was conducted on the effects of rotational grazing (RG) compared to continuous grazing (CG) on the behavior of cattle grazing on rangelands. Different livestock den&tics in the RG treatments were created by varying the size of paddocks in a 4651a, U-paddock, cell deaigntd RG treatment stocked at a rate of 3.6 ha/cow/yr. Paddock sizes of 30 and lo-ha were used to simulate RG with 14 (RG...

2014
Stacy C. Davis Laura A. Burkle Wyatt F. Cross Kyle A. Cutting John F. Valentine

Livestock grazing can be used as a key management tool for maintaining healthy ecosystems. However, the effectiveness of using grazing to modify habitat for species of conservation concern depends on how the grazing regime is implemented. Timing of grazing is one grazing regime component that is less understood than grazing intensity and grazer identity, but is predicted to have important impli...

2010
A. J. Smart J. D. Derner J. R. Hendrickson R. L. Gillen B. H. Dunn E. M. Mousel P. S. Johnson R. N. Gates K. K. Sedivec K. R. Harmoney J. D. Volesky K. C. Olson

Comparisons of stocking rates across sites can be facilitated by calculating grazing pressure. We used peak standing crop and stocking rates from six studies in the North American Great Plains (Cheyenne, Wyoming; Cottonwood, South Dakota; Hays, Kansas; Nunn, Colorado; Streeter, North Dakota; and Woodward, Oklahoma) to calculate a grazing pressure index and develop relationships for harvest effi...

Journal: :ecopersia 2014
majid ajorlo ramdzani abdullah

water quality is a serious issue in tropical grasslands that must be addressed to ensure the continuity and sustainability of water resources. this study aimed to assess the stream water quality of tropical grassland under long-term moderate (2.7 animal unit ha-1 y-1 for 34 years) and short-term heavy (5 animal unit ha-1 y-1 for 2 years) grazing systems at catchment and farm scales in kuala lum...

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