Effects of year-round stocking methods and stocking rates on seasonal forage response and cow-calf weight gain in the gulf coast region of the United States

Abstract

<h2>ABSTRACT</h2> The present research is the second phase (2 yr) of a multiyear cow-calf study employing fixed stocking rates and examining the effect of stocking method, i.e., continuous and rotational, and stocking rate on beef cattle production. Two sets of 4 adjacent pastures, each containing a mixed warm-season, perennial grass sod [common bermudagrass, Cynodon dactylon (L.) Pers.; dallisgrass, Paspalum dilatatum Poir.], were overseeded to ‘Marshall' annual ryegrass (Lolium multiflorum) in the autumn of 2 consecutive years. Within each set of 4 pastures, one of the following grazing treatments was randomly assigned each pasture: rotationally stocked (8 paddocks) at a low, medium, or high stocking rate and continuously stocked at a moderate stocking rate. Low, medium, and high stocking rates were 1.25, 2, and 2.75 cows/ha. Brangus cows and their suckling calves were stocked on treatment pastures in March 2004. Stocking treatment affected prebreeding cow BW (P < 0.01) and tended to affect precalving (P = 0.13), postbreeding (P = 0.07), weaning (P = 0.11), and subsequent precalving cow BW (P = 0.08). Stocking-method treatments were similar in forage allowance in the early- and late-spring periods (P = 0.67 and P=0.65, respectively), but in the summer period, rotationally stocking at a medium stocking rate was greater (P < 0.01) than continuously stocking at a moderate stocking rate. There was a consistent trend across seasons for the percent CP in the simulated bite sample DM to be greater (P < 0.1) for the continuously stocking at a moderate stocking rate compared with the rotationally stocking at a medium stocking rate stocking methods. Based upon cow BW outcomes in this research, stocking rate is the most important consideration in design of a grazing program.