Chapter 9: Selection of grazing methods
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1 Chapter 9: Selection of grazing methods 1. Definition of terms 2. Consideration in grazing system selection 3. Comparisons of the different grazing systems 4. Detailed evaluation of short duration grazing 5. Grazing systems for riparian zones 6. Economics of grazing systems 7. Review of grazing system studies
2 Stocking vs. Specialized grazing systems Range research shows stocking rate has had a much bigger impact on range vegetation and financial returns than specialized grazing systems. Specialized grazing systems will not overcome the impacts of excessive stocking.
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4 Grazing systems Grazing systems manipulation of livestock grazing to accomplish a desired result. Objectives of grazing system: a. defer or rest key species b. obtain more uniform use of forage crop c. increase livestock productivity d. provide opportunity for sacrifice areas to recover e. increase wildlife productivity
5 Some terminology Specialized grazing systems - grazing systems other than continuous or season long that involve scheduled moves of livestock during the grazing season. Deferment delay of grazing in a pasture until seed maturity of key species. Rest - non use of a pasture for one year (12 months) Rotation movement of livestock from one pasture to another on scheduled basis.
6 Considerations involving grazing systems 1. Vegetation 2. Livestock 3. Wildlife 4. Watershed protection 5. Labor 6. Developments a. fence b. Water 7. Climate
7 Conditions where specialized grazing systems are most useful: 1. Rugged topography 2. Wildlife are and important consideration 3. High diversity in forage resources 4. More than one type of livestock will be grazed 5. Poor water distribution 6. Poor distribution of precipitation over the range occurs within years ( the Southwestern United States) 7. Timbered areas where carefully timed grazing is necessary to prevent tree damage 8. Vegetation has low resistance to grazing
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11 Types of grazing systems 1. Continuous 2. Season long 3. Deferred rotation 4. Rest rotation 5. Short duration 6. Best pasture 7. Seasonal suitability 8. High intensity low frequency 9. Merrill 3 herd/4 pasture
12 Continuous Grazing 1. Works well in flat desert areas 2. Works well in flat shortgrass prairie areas 3. Works well in California annual grassland 4. Require the least fence of all the systems 5. Has given better livestock performance than rotation systems
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18 Deferred Rotation Grazing 1. Works well in coniferous forest 2. Works well in tallgrass prairie 3. Developed by Dr. Arthur Sampson in northeastern Oregon around 1906
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24 Rest Rotation Grazing 1. Works well in rugged terrain 2. Works well for well for riparian enhancement, wildlife, fish and other multiple use values if grazing is light to moderate in grazed pastures 3. Developed by Gus Hormay on Forest Service rangelands in the 1950 s
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27 Table 19. Effects of year-long and Santa Rita rest-rotation grazing on vegetation on semi-desert rangeland in southeastern Arizona. Characteristic Grazing yearlong Grazing System rest- rotation Duration of study (years) Annual precipitation (inches) % use of forage Perennial grass production (lb/ac) Perennial grass density (plants/m2) It was concluded Santa Rita rest-rotation grazing had no benefit over year-long grazing on rangelands in high ecological condition but may have benefits for degraded rangelands (source Martin and Severson, 1988).
28 Short Duration Grazing (Savory grazing approach) Best suited to flat, humid areas Requires the most fence of all the systems Developed by Mr. Alan Savory in Zimbabwe Africa
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32 Table 16. Effects of continuous and short- duration grazing on blue grama rangeland in south-central New Mexico Characteristics Grazing systems Continuous Short duration Duration of study (years) 5 5 Annual precipitation (inches) % forage use Not Given Herbage production (lbs./acre) 1,067 1,080 Blue grama production (lbs./acre) Range trend Stable/up Stable/up Cow conception rate (%) Calf weaning wts. (lbs.) Average daily gain (lbs.) Gain per acre (lbs.) Not Given
33 Table 16b. It was concluded differences in vegetational responses to short duration and continuous grazing were small. Results indicated that cow-calf performance under short duration was less than under moderate continuous grazing. The authors concluded their studies shows the overriding of stocking rate on livestock performance. Sources: White, M.R., R.D. Pieper, G.B. Donart and L. White-Trifaro. 1991; Parker, E.E., G.B. Donart, R.D. Pieper, J.D. Wallace, and J.D. Wright
34 Table 17. Effects of season-long, deferred rotation and time controlled on vegetation and cattle on vegetation and cattle on short grass range in Wyoming. Characteristic Season-long Deferred Time rotation controlled Duration of study (years) Annual precipitation (inches) Use of forage (%) Acres/steer Forage production (lbs./acre) No difference Range trend No difference Steer gains (lbs./acre) No difference Financial returns ($/acre) Sources: Hart, R.H., M.J. Samuel, P.S. Test and M.A. Smith Cattle, vegetation and economic responses to grazing systems and grazing pressure. J. Range Manage. 41: , Manley, W.A., R.H. Hart, J.W. Waggoner Jr., and J.T. Manley Vegetation, cattle and economic responses to grazing strategies and pressure. J. Range Manage.50:
35 Table 18. Effects of grazing systems on yearling cattle production on tallgrass prairie rangeland in Oklahoma. Characteristic Short duration Season long Duration of study (years) 6 6 Annual precipitation (inches) Estimated use of forage (%) Stocking rate (AUD s/acre) Forage production (lbs./acre) 3 3,200 2,670 Range trend Stable Stable Gain per steer (lbs) Gain per acre (lbs) Net returns ($/acre) precipitation during study was 127% long term average. 2 AUD=Animal Unit Day. 3 Forage standing crop in September Sources: Gillen, R.L., F.T. McCollum, K.W. Tate and M.B. Hodges Tallgrass prairie response to grazing system and stocking rate. J. Range Manage 51: McCollum, F.T., R.L. Gillen, B.R. Karges and M.E. Hodges Stocker cattle response to grazing management in tallgrass prairie. J. Range manage. 52:
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37 Best Pasture Grazing 1. Works well in southwestern United States where rainfall is highly uneven across ranches and landscapes 2. Was designed by Ken Valentine, a deceased professor from New Mexico State University 3. Has been studied at two locations in New Mexico
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39 Table 14. Rangeland and Cattle production characteristics for different grazing management Strategies on Chihuahuan Desert Rangelands, South-central New Mexico Conservative Conservative Characteristics continuous best pasture Duration of study (years) Average precipitation (inches) Average perennial grass production (lbs/acre) Range trend up up Range condition good/excellent good % forage use Calf crop (%) Calf weaning wt (lbs) Estimated gain/acre (lbs) Sources: Beck, R.F., 1978; Beck, R.F. and R.P. McNeely, 1993.
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42 Seasonal Suitability Grazing First developed by C. Wayne Cook in Utah in l950 s Designed for areas and ranches where forage resources are diverse (Intermountain West) Involves using each plant community when best for livestock
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45 Seasonal suitability grazing Complementary grazing Coordination of grazing to plant and animal requirements so that vegetation and livestock production are optimized on a sustained basis.
46 Southwest Black grama Tobosa grass Creosotebush Winter Lehman lovegrass Summer Spring Drought Mesquite/ Mesa Dropseed Early Fall Early summer
47 Northwest Winterfat Black sage Cheat grass Crested wheatgrass Native Bunch grass Crested wheatgrass Winter Early Spring Summer Fall Spring
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49 High Intensity-Low Frequency Grazing 1. Works best in flat, humid areas 2. Gives the worst livestock performance of all the grazing systems because livestock are forced to eat plants of low palatability
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53 Merrill Three herd Four pasture System 1. Designed for areas when effective precipitation can occur anytime during the year (South Texas). 2. Can be modified for New Mexico rangelands 3. Best studied of all grazing systems 4. Has proven superior to continuous grazing 5. Developed by Leo B. Merrill in Texas in the l950 s 6. Works well for common use grazing and for wildlife
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60 Development and Evaluation of Multi-Herd/Variable Stocking A. Study area involves 200,000 acre ranch with 30 pastures in west- central New Mexico B. Five years of data collected C. Initial results look very promising in terms of increased forage production, increased livestock production and and increased financial returns D. Key features- 25% of land receives deferment or rest depending on need, each pasture stocked in accordance with annual forage production and its condition, wildlife and riparian needs are taken into account when stocking rates, grazing timing and grazing frequency are assigned each year, system incorporates flexibility and adaptive management
61 Grazing Systems for Riparian Zones
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