Corn distillers dried grains with solubles supplementation in a pasture-based beef production system
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چکیده
Corn Distillers Dried Grains with Solubles (CDDGS) supplementation of Augustcalving cows or calves in a winter grazing system was evaluated. In two years, ‘Fawn’ endophyte-free tall fescue forage in six 4.04-ha pastures was stockpiled from mid-August. In mid-November, 24 pregnant, mature, August-calving Simmental x Angus cows (mean BW = 676 ± 2.6 and 669 ± 2.6 kg; mean BCS = 6.0 ± 0.05 and 6.2 ± 0.05) with calves (mean BW = 129 ± 4.8 and 137 ± 4.8 kg) were allotted by cow BW and BCS and calf sex and BW to the pastures to strip-graze stockpiled forage for 130 and 136 d. Supplementation treatments assigned to replicate pastures included: CDDGS supplementation of cows when weather prevented grazing (Minimal treatment), minimal CDDGS supplementation of cows, but ad libitum feeding of a pelleted CDDGS-soy hull creep feed to calves (Creep treatment), or CDDGS supplementation to the cows to maintain a mean BCS of 5 (9-point scale; CDDGS treatment). Over the 2 winters, calves in the Creep treatment had greater (P < 0.001) BW gains than calves in the CDDGS and Minimal treatments. Cows in the Minimal and Creep treatments had greater (P < 0.02) BW losses than cows in the CDDGS treatment. After weaning, calves were commingled in a drylot and fed tall fescue hay ad libitum with 0.91 kg/calf of the CDDGS-soy hull creep feed daily for 35 and 28 d. In April, steer calves were moved to a smooth bromegrass pasture divided into eight 2.02-ha paddocks to graze by rotational stocking as one group for 56 d. Subsequently, steers were separated by winter treatment and allotted to six of the 2.02-ha paddocks to graze by continuous stocking with a CDDGS-based supplement fed at up to 7.3 kg∙hd -1 ∙d -1 for 139 and 156 d in yr 1 and 2. To finish, steers were allotted to six pens in a feedlot and fed ground smooth bromegrass hay ad
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