Cow-Calf Production from Alfalfa-Grass or Smooth Bromegrass Pastures Rotationally Grazed at Three Stocking Rates

Pastures containing alfalfa-grass or smooth bromegrass were stocked with .6, .8, or 1.0 cow-calf units per acre to compare cow and calf production in rotational grazing systems managed for optimum forage quality. To remove excess forage early in the grazing season, yearling heifers or steers grazed with the cows in each pasture at a stocking rate of .6 ccu per acre for the first 28, 37, and 40 days of grazing in years one, two, and three. Live forage density and days of grazing per paddock were estimated by sward height. Cows, calves, and yearlings were weighed and cows condition scored every 28 days. All cows grazed for 140 days unless forage became limiting. The cows on the smooth bromegrass pasture stocked at 1.0 cow-calf units per acre were removed after 119 days in 1994, 129 days in 1995, and 125 days in 1996. Cows on one of the alfalfagrass pastures stocked at 1.0 ccu per acre were removed after 136 days of grazing in 1996 because of lack of forage. Alfalfa-grass pastures tended to have a more consistent supply of forage over the grazing season than the bromegrass pastures. Cows grazing the alfalfa-grass pastures had greater seasonal weight gains and body condition score increases and lower yearling weight gains than the smooth bromegrass pastures. Daily and total calf weight gains and total animal production also tended to be greater in alfalfa-cool season grass pastures. Increasing stocking rates resulted in significantly lower cow body condition increases and yearling weight gains, and also increased the amounts of calf and total growing animal produced.

Cow-Calf Production from Alfalfa-grass or Smooth Bromegrass Pastures Rotationally Grazed at Different Stocking Rates

Pastures containing alfalfa-smooth bromegrass or smooth bromegrass were stocked with .6, .8, or 1.0 cow-calf units per acre to compare cow and calf production in rotational grazing systems managed for optimum forage quality. To remove excess forage early in the grazing season, yearling heifers grazed with the cows in each pasture at a stocking rate of .6 heifers per acre for the first 28 days of grazing. Live forage density and days of grazing per paddock were estimated by sward height. Cows, calves, and heifers were weighed and cows condition scored every 28 days. All cows grazed for 140 days except those grazing the smooth bromegrass pasture stocked at 1.0 cow-calf units per acre; these were removed after 119 days in 1994 and 129 days in 1995 because of lack of forage. Alfalfa-grass pastures tended to have a more consistent supply of forage over the grazing season than the bromegrass pastures. Cows grazing the alfalfa-cool season grass pastures had greater seasonal weight gains and body condition score increases and lower heifer weight gains than the smooth bromegrass pastures. Daily and total calf weight gains and total animal production also tended to be greater in alfalfa-cool season grass pastures. Increasing stocking rates resulted in significantly lower condition increases and heifer weight gains, while increasing the amounts of calf and total growing animal produced.

Intensive Rotational Grazing of Steers at the Andrew Jackson Demonstration Farm

Fifty head of crossbred steers started grazing 51 acres of pasture on May 1 in a rotational grazing system using a variable density paddock system. Twenty-two head grazed 92 days, 27 grazed 140 days, and one steer died. A total of 11,922 pounds was produced on 5,804 animal-days of grazing. The average daily gain was 2.02 pounds for group 1 and 2.07 for group 2. The stocking rate for the first 92 days was .98 steers per acre and .53 for the final 48 days. The animal days of grazing per acre was 113 and the pounds of gain per acre was 233. Total return for land, labor and management for the demonstration was $2,829.76 or $55.49/acre.

Management Intensive Grazing of Stockers at the Andrew Jackson Demonstration Farm (1996 – 1998)

The Andrew Jackson Demonstration Farm (AJDF) is located in central Jackson County in east central Iowa. A board of directors operates the farm for the purpose of demonstrating different production practices and management strategies. From 1996 to 1998 management intensive grazing practices and the grazing of stockers on a combination of permanent and tillable pasture have been demonstrated. Grazing strategies or practices demonstrated during these years included establishment of Eastern Gamagrass and Big Bluestem, variable density grazing, measuring forage on-offer, estimating dry matter intake, grazing corn, pasture renovation, and fencing and water systems. Production performance data were gathered for the three years stockers that were grazed. During this time the stockers averaged 121 animal days of grazing, a 1.1 head per acre stocking rate, a 1.85 pound average daily gain, and 228 pounds of gain per acre. The financial measures evaluated the value of gain on pasture and the pasture cost of the gain. The value of gain per pound was positive for 1996 and 1997 at $.58 and $.52 whereas in 1998 it was a -$.04. Pasture costs per pound of gain ranged from $.12 to $.16. Production performance is only one part of the profit picture when evaluating a stocker operation. Buysell margins are the other significant part that can greatly impact the profit potential of a summer grazing program.

Intensive Rotational Grazing of Steers on Highly Erodible Land at the Adams County CRP Project

Grazing yearling steers is one way to utilize the forages required for participation in the Conservation Reserve Program (CRP) after CRP contracts expire. In 1995, a stocker-steer intensive-rotational grazing study was conducted at the CRP Research and Demonstration Project near Corning, Iowa. A similar study was carried out in 1994. Seventy-five yearling crossbred steers grazed a 65- acre pasture that had been divided into 27 paddocks using electric fencing from May 4, 1995 to September 14, 1995. During this period, the 65-acre pasture system produced 9,975 animal-days of grazing and 11,403 pounds of gain. On a per-acre basis, this translates to 153.5 animal-days of grazing and 175.4 pounds of gain. The stocking rate was constant for the entire 133- day grazing season at 1.15 steers per acre. On May 4, 1995, the beginning of the grazing season, the average weight of the steers was 495.7 pounds. By the end of the grazing trial on September 14, 1995, the average weight of the steers had increased to 647.7 pounds. The average gain per steer during the 133-day grazing period was 152 pounds, and the average daily gain per steer was 1.14 pounds. The average bodyweight of the steers during the entire grazing season was 571.7 pounds.