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Pasture and Stocker Cattle Performance on Furrow-Irrigated Alfalfa and Tall Wheatgrass Pastures, Southern High Plains, USA

^a Agric. Sci. Center at Tucumcari, New Mexico State Univ., 6502 Quay Road AM.5, Tucumcari, NM 88401
^b Retired, Dep. of Anim. and Range Sci., Box 3003 MSC 3-I, New Mexico State Univ., Las Cruces, NM 88003
^c Dep. of Anim. Sci., 2471 TAMU, College Station, TX 77843-2471
^d Dep. of Agric. and Ext. Educ., Agric. Biometrics Service, P. O. Box 30003, MSC 3501, Las Cruces, NM 88003

View larger version (22K): [in this window] [in a new window]   Fig. 1. The difference across years in seasonal distribution of tall wheatgrass regrowth in alfalfa and tall wheatgrass pastures at Tucumcari, NM. ALF-R = rotationally stocked monoculture alfalfa (35-d regrowth), TW-R = rotationally stocked monoculture tall wheatgrass (35-d regrowth), ALF/TW-R = rotationally stocked alfalfa–tall wheatgrass (35-d regrowth), ALF/TW-C = continuously stocked alfalfa–tall wheatgrass (28-d regrowth). DM = dry matter. Bars indicate the LSD (0.05) for within date comparisons between pastures. Absence of bars indicates no difference within that date. No bars within a year indicate no date x pasture treatment interaction for that year. Data are the means of two replicates.

View larger version (22K): [in this window] [in a new window]   Fig. 2. The difference across years in seasonal distribution of alfalfa regrowth in alfalfa and tall wheatgrass pastures at Tucumcari, NM. ALF-R = rotationally stocked monoculture alfalfa (35-d regrowth), TW-R = rotationally stocked monoculture tall wheatgrass (35-d regrowth), ALF/TW-R = rotationally stocked alfalfa–tall wheatgrass (35-d regrowth), ALF/TW-C = continuously stocked alfalfa–tall wheatgrass (28-d regrowth). DM = dry matter. Bars indicate the LSD (0.05) for within date comparisons between pastures. Absence of bars indicates no difference within that date. No bars within a year indicate no date x pasture treatment interaction for that year. Data are the means of two replicates.

View larger version (21K): [in this window] [in a new window]   Fig. 3. The difference across years in seasonal distribution of total forage regrowth in alfalfa–tall wheatgrass pastures at Tucumcari, NM. ALF-R = rotationally stocked monoculture alfalfa (35-d regrowth), TW-R = rotationally stocked monoculture tall wheatgrass (35-d regrowth), ALF/TW-R = rotationally stocked alfalfa–tall wheatgrass (35-d regrowth), ALF/TW-C = continuously stocked alfalfa–tall wheatgrass (28-d regrowth). DM = dry matter. Bars indicate the LSD (0.05) for within date comparisons between pastures. Absence of bars indicates no difference within that date. No bars within a year indicate no date x pasture treatment interaction for that year. Data are the means of two replicates.

View larger version (16K): [in this window] [in a new window]   Fig. 4. Seasonal changes in stocking rate of yearling beef cattle grazing alfalfa and tall wheatgrass pastures at Tucumcari, NM. ALF-R = rotationally stocked monoculture alfalfa, TW-R = rotationally stocked monoculture tall wheatgrass, ALF/TW-R = rotationally stocked alfalfa–tall wheatgrass, ALF/TW-C = continuously stocked alfalfa–tall wheatgrass. Bars indicate the LSD (0.05) for within date comparisons between pastures. Data are the pooled means of three years and two replicates.

View larger version (22K): [in this window] [in a new window]   Fig. 5. The difference across years in seasonal changes in average daily gains of yearling beef cattle grazing alfalfa and tall wheatgrass pastures at Tucumcari, NM. ALF-R = rotationally stocked monoculture alfalfa, TW-R = rotationally stocked monoculture tall wheatgrass, ALF/TW-R = rotationally stocked alfalfa–tall wheatgrass, ALF/TW-C = continuously stocked alfalfa–tall wheatgrass. LW = live weight. Bars indicate the LSD (0.05) for within date comparisons between pastures. Absence of bars indicates no difference within that date. Data are the means of two replicates.

View larger version (17K): [in this window] [in a new window]   Fig. 6. Seasonal changes in cumulative gain ha–1 by beef yearlings grazing alfalfa and tall wheatgrass pastures at Tucumcari, NM. ALF-R = rotationally stocked monoculture alfalfa, TW-R = rotationally stocked monoculture tall wheatgrass, ALF/TW-R = rotationally stocked alfalfa–tall wheatgrass, ALF/TW-C = continuously stocked alfalfa–tall wheatgrass. LW = live weight. Bars indicate the LSD (0.05) for within-date comparisons between pastures. Data are the pooled means of 3 yr and two replicates.