title: Effects of stocking rate and corn gluten feed supplementation on performance of young beef cows grazing winter-stockpiled tall fescue-red clover pasture.
abstract: A winter grazing experiment was conducted to evaluate the effects of stocking rate and corn gluten feed supplementation on forage mass and composition and the BW and BCS of bred 2-yr-old cows grazing stockpiled forage during winter. Two 12.2-ha blocks containing Fawn, endophyte-free, tall fescue and red clover were each divided into 4 pastures of 2.53 or 3.54 ha. Hay was harvested from the pastures in June and August of 2003 and 2004, and N was applied at 50.5 kg/ha at the initiation of stockpiling in August. On October 22, 2003, and October 20, 2004, twenty-four 30-mo-old Angus-Simmental and Angus cows were allotted by BW and BCS to strip-graze for 147 d at 0.84 or 1.19 cow/ha. Eight similar cows were allotted to 2 dry lots and fed tall fescue-red clover hay ad libitum. Corn gluten feed was fed to cows in 2 pastures to maintain a mean BCS of 5 (9-point scale) at each stocking rate and in the dry lots (high supplementation level) or when weather prevented grazing (low supplementation level) in the remaining 2 pastures at each stocking rate. Mean concentrations of CP in yr 1 and 2 and IVDMD in yr 2 were greater (P < 0.10) in hay than stockpiled forage over the winter. At the end of grazing, cows fed hay in dry lots had greater (P < 0.05) BCS in yr 1 and greater (P < 0.10) BW in yr 2 than grazing cows. Grazing cows in the high supplementation treatment had greater (P < 0.10) BW than cows grazing at the low supplementation level in yr 1. Cows in the dry lots were fed 2,565 and 2,158 kg of hay DM/cow. Amounts of corn gluten feed supplemented to cows in yr 1 and 2 were 46 and 60 kg/ cow and did not differ (P = 0.33, yr 1; P = 0.50, yr 2) between cows fed hay or grazing stockpiled forage in either year. Estimated production costs were greater for cows in the dry lots because of hay feeding.
authors.affiliation: Department of Animal Science.
authors.forename: R
authors.initials: R
authors.lastname: Driskill
authors.forename: J R
authors.initials: JR
authors.lastname: Russell
authors.forename: D R
authors.initials: DR
authors.lastname: Strohbehn
authors.forename: D G
authors.initials: DG
authors.lastname: Morrical
authors.forename: S K
authors.initials: SK
authors.lastname: Barnhart
authors.forename: J D
authors.initials: JD
authors.lastname: Lawrence
mesh_terms: D000821:Animal Feed; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001835:Body Weight; D002417:Cattle; D004032:Diet / Q000662:veterinary*; D019587:Dietary Supplements; D017753:Ecosystem; D005260:Female; D005983:Glutens / Q000378:metabolism / Q000494:pharmacology*; D008297:Male; D006109:Poaceae; D011156:Population Density; D012621:Seasons; D013997:Time Factors; D029921:Trifolium; D014887:Weather; D003313:Zea mays / Q000378:metabolism*
chemical_list: D005983:Glutens