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Effect of Lasalocid on Weight Gains, Ruminal Fermentation and Forage Intake of Stocker Cattle Grazing Winter Wheat Pasture^1,2,

Oklahoma Agricultural Experiment Station, Stillwater 74078-0425

Abstract

Fifty fall-weaned heifers with initial weights of 209 kg (yr 1) and 222 kg (yr 2) were used to determine effects of lasalocid on weight gains, forage intake and ruminal fermentation of stocker cattle grazing winter wheat pasture. The heifers grazed a single wheat pasture for about 100 d each year, and were individually fed 1.06 kg of supplement (6 d/wk) pro-rated to supply 0, 100 or 200 mg lasalocid·head^–1·d^–1. Also, eight mature Hereford steers with large rumen cannula were used to evaluate further effects of lasalocid (0 or 300 mg) on ruminal fermentation during two grazing periods (immature and mature wheat forage) of yr 2 and an additional third year. Daily gains of heifers fed 200 mg lasalocid/d were .11 kg greater (P<.05) than those of heifers fed 0 or 100 mg lasalocid/d. One hundred milligrams lasalocid did not increase weight gains. Digestibilities of forage dry matter (DM) and organic matter (OM) were similar (P>.05) among treatments, and lasalocid did not affect (P>.10) forage intake. Ruminal ammonia concentrations (10.57, 15.22 and 17.81 mg/dl ± 1.71) were increased (P<.05) by both levels of lasalocid in yr 1, but differences among treatment means of 8.32, 11.95 and 11.66 (SE ± 1.44) were not significant in yr 2. Lasalocid did not consistently affect total volatile fatty acids concentrations. The acetic:propionic acid ratios in heifers were not different (P>.05) among treatments, but were decreased (P<.10) by lasalocid in cannulated steers. Results of these studies were interpreted as indicating that 200 mg lasalocid/d was effective in increasing weight gains of stocker cattle on wheat pasture without altering forage intake.

¹ Journal article no. 5120 of the Agric. Exp. Sta., Oklahoma State Univ., Stillwater 74078.

² The term "stocker cattle" as used in this manuscript refers to weaned beef cattle that are grown to higher weights on wheat pasture before being placed in feedlots.

³ Anim. Sci. Dept.

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				W. A. Phillips and G. W. Horn Intake and digestion of wheat forage by stocker calves and lambs J Anim Sci, September 1, 2008; 86(9): 2424 - 2429. [Abstract] [Full Text] [PDF]