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Sequential Grazing of Cool- and Warm-Season Pastures

Dep. of Agron., Iowa State Univ., Ames, IA 50011-1010

View larger version (22K): [in a new window]   Fig. 1. Total precipitation and average daily temperature during the spring (Mar.–May), summer (June–Aug.), and fall (Sept.–Nov.) during 5 yr of grazing at the McNay Agricultural Research Farm near Chariton, IA. Open symbols represent the 30-yr mean for each season.

View larger version (27K): [in a new window]   Fig. 2. Average legume percentage in cool-season pastures during 5 yr of grazing. Appropriate standard errors of the mean for comparisons within years are 2.8, 2.2, 2.0, 1.5, and 1.5, consecutively. DM, dry matter.

View larger version (29K): [in a new window]   Fig. 3. Average forage available of cool-season pastures during 5 yr of grazing. Appropriate standard errors of the mean for comparisons within years are 118, 146, 221, 134, and 172, consecutively.

View larger version (27K): [in a new window]   Fig. 4. Average forage available of warm-season grass pastures during 5 yr of grazing. Appropriate standard errors of the mean for comparisons within years are 397, 408, 279, 239, and 355, consecutively.

View larger version (26K): [in a new window]   Fig. 5. Nutritive value of cool-season (closed symbols) and warm-season (open symbols) pastures during the 1997 grazing season. Standard errors of the mean are 4.6, 7.5, and 9.2 for cool-season pastures and 5.4, 8.9, and 10.1 for warm-season pastures for crude protein, in vitro dry matter (DM) digestibility, and neutral detergent fiber, respectively.

View larger version (26K): [in a new window]   Fig. 6. Nutritive value of cool-season (closed symbols) and warm-season (open symbols) pastures during the 1998 grazing season. Standard errors of the mean are 3.4, 8.9, and 8.7 for cool-season pastures and 2.6, 7.5, and 6.2 for warm-season pastures for crude protein, in vitro dry matter (DM) digestibility, and neutral detergent fiber, respectively.

View larger version (26K): [in a new window]   Fig. 7. Nutritive value of cool-season (closed symbols) and warm-season (open symbols) pastures during the 1999 grazing season. Standard errors of the mean are 3.4, 7.3, and 7.5 for cool-season pastures and 3.1, 5.5, and 6.6 for warm-season pastures for crude protein, in vitro dry matter (DM) digestibility, and neutral detergent fiber, respectively.

View larger version (25K): [in a new window]   Fig. 8. Nutritive value of cool-season (closed symbols) and warm-season (open symbols) pastures during the 2000 grazing season. Standard errors of the mean are 2.6, 6.0, and 5.1 for cool-season pastures and 2.3, 14.0, and 5.6 for warm-season pastures for crude protein, in vitro dry matter (DM) digestibility, and neutral detergent fiber, respectively.

View larger version (24K): [in a new window]   Fig. 9. Nutritive value of cool-season (closed symbols) and warm-season (open symbols) pastures during the 2001 grazing season. Standard errors of the mean are 2.9, 7.2, and 6.2 for cool-season pastures and 2.8, 7.5, and 6.4 for warm-season pastures for crude protein, in vitro dry matter (DM) digestibility, and neutral detergent fiber, respectively.

View larger version (19K): [in a new window]   Fig. 10. Plot of average liveweight gain over years for each grazing sequence against its coefficient of variation over years. BT = birdsfoot trefoil, KC = kura clover, A = alfalfa, BB = big bluestem, SG = switchgrass, and SB = smooth bromegrass; SB indicates cattle remained on cool-season pasture during summer grazing period.