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United States Department of Agriculture (USDA) 2011

EFFECT OF TWO STOCKING LEVELS ON CATTLE PRODUCTION, FORAGE PRODUCTION, AND FINANCIAL RETURNS ON THE CHIHUAHUAN DESERT

Stocking Cattle Forage

United States Department of Agriculture (USDA) Research, Education & Economics Information System (REEIS)

Titre : EFFECT OF TWO STOCKING LEVELS ON CATTLE PRODUCTION, FORAGE PRODUCTION, AND FINANCIAL RETURNS ON THE CHIHUAHUAN DESERT

Identification : NM-HOLECHEK-11H

Pays : Etats Unis

Durée : Oct 1, 2011 à Sep 30, 2016

Domaine : Animal Management Systems ; Animal Physiological Processes ; Management of Range Resources ; Rangelands and grasslands, general ; Beef cattle, live animal

Partenaire : NEW MEXICO STATE UNIVERSITY 1620 STANDLEY DR ACADEMIC RESH A RM 110 LAS CRUCES,NM 88003-1239

Objectifs
I am proposing this study fulfill the following four objectives : 1) Determine long-term effects (20 years) of light (25% forage use) and conservative (35% forage use) cattle grazing intensities on vegetation composition and productivity on the Chihuahuan Desert rangeland ; 2) Determine long-term effects of light and conservative grazing intensities on cow-calf productivity (% calf crop, calf weaning weights, cattle death loss) on the Chihuahuan Desert rangeland ; 3) Determine the long-term effects of light and conservative grazing intensities on forage production on Chihuahuan Desert rangelands with low, moderate, and high levels of mesquite cover and density ; and 4) Determine the long-term effects of light and conservative cattle grazing intensities on financial returns from cattle (cow-calf) on Chihuahuan Desert rangelands.

Descriptif
The number of cows assigned to pastures 15 and 1 were based on 30% use of the current forage standing crop (Holechek 1988, Molinar 1999, Hawkes, 2004, Khumalo 2006). Pastures 4 and 14 were stocked for 40% use of the forage standing crop. Stocking rates will continue to be readjusted twice a year in October and May based on forage production to obtain 25% use in pastures 15 and 1, and 35% use in pastures 14 and 4. Actual measured spring use levels have averaged 29% on lightly grazed pastures and 40% on conservatively grazed pastures in the 1998 to 2006 period. Procedures of Holechek and Galt will continue to be used to determine spring grazing use for each pasture. Detailed records on herd management and cattle numbers are kept by Dr. Milton Thomas. Cows and their calves will continue to be weighed in October of each year prior to sale of calves. In addition cow body condition is being assessed. Cows are weighed again in February prior to calving. Weaning percentages are based on calves from cows bred on the pastures the previous summer. Weaning weights include those calves that were put on the pastures the previous springs but cows may not have been there for the breeding season. Factors in the analysis of variance will include blocks (2) grazing treatments (2) and years (20). Pastures 15 and 1 will be replicates for the conservatively grazed treatment and pastures 14 and 4 will be replicates for the moderately grazed treatment. Regression analysis will be used to determine the relationship between forage standing crop and calving percentage and calf weaning weight. Multiple regression analysis will be used to determine the effect of mesquite canopy cover and density on forage standing crop. Reports on these data will be submitted to the Journal of Range Management for peer review and publication. Long term changes in vegetation composition on the study pastures between study initiation (1995, 1996, 1997) and study terminating (2014, 2015, 2016) will be evaluated using mutivariate procedures and similarity indices. The average vegetation composition for the first three years and last years of the study will be used to assess trend to minimize effects of uneven rainfall among years and across the pastures within years.

Présentation : USDA

Page publiée le 23 novembre 2015, mise à jour le 12 novembre 2017