ASAS/ADSA Forages and Pastures: Grazing and Alternative Forages
نویسندگان
چکیده
An experiment was conducted to determine animal performance and gain/ha of beef steers (mean initial wt.: 241 kg) grazing a conventional sorghum x sudan hybrid (C) versus its near isogenic brown midrib (BMR) variety. The experiment was conducted during the summers of 1999 and 2000 in the Texas Panhandle. During both summers 8 pasture plots (2.2 ha) were blocked by location and randomly assigned either C or BMR. Fertilization and irrigation were similar for both varieties. Data were analyzed using a model containing year, block, forage type, and year by forage type. The interactions were not significant. Pastures were grazed using put and take stocking for an average of 41 and 58.5 d at an average stocking rate of 6.71 and 5.10 head/ha for years 1999 and 2000, respectively. Head d/ha, gain/ha, and ADG were determined. Steers grazing BMR tended (P = .0651) to gain more rapidly (1.33 kg/d) than steers grazing the C hybrid (1.19 kg/d). Gain/ha (361.5 kg, P=.12) and head d/ha (286.9, P=.98) were not different. BMR varieties are known for less lignin content, which should result in improved digestibility and thus increased ADG.
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ASAS/ADSA Forages and Pastures: Grazing
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