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Effect of Monensin with Cottonseed Hulls and Energy Supplements for Growing Steers^{1 ,2,}

University of Florida, Gainesville 32611

Abstract

Forty steers averaging 282 kg initially were allotted randomly to four treatment groups, with two replicates each, in a 2 x 2 factorial arrangement of diet treatments to determine the effect of 0 and 200 mg monensin per head daily and two levels of energy supplementation when cottonseed hulls were fed ad libitum for 126 days. The animals were continued an additional 6 days to obtain ruminal fluid samples. The two supplements, consisting of combinations of soybean meal, corn meal, minerals and vitamins were fed once daily to provide either 1.4 or 2.2 kg/head, and an isonitrogenous supplemental intake of 643 g crude protein/head daily. Average daily gain (ADG), daily total feed intake (FI), and total feed required per unit gain (F:G) for the low energy supplement with and without monensin and the high energy supplement with and without monensin were ADG, .83, .78, .89, .81 kg; FI, 11.85, 12.87, 11.66, 12.11 kg; F:G, 14.35, 16.49, 13.09, 15.03, respectively. Average daily gain was not affected (P>.10) by treatment. Monensin decreased daily FI (P<.01) and improved F:G (P=.02). Steers fed the low energy supplement consumed more total feed (P=.03) than those fed the high energy supplement (12.36 vs 11.88 kg/head daily). Ruminal propionic acid, at 9 and 28 hr after feeding supplements decreased (P<.01) from 18.4 and 12.7 moles/100g with monensin to 13.5 and 10,7 moles/100g without monensin. Propionic acid concentration at 9 hr after supplementation was increased (P<.01) by higher supplemental energy but not at 28 hours.

¹ Florida Agr. Exp. Sta. Journal Series No. 1732.

² The authors wish to thank Elanco Products Co., Indianapolis, IN for providing financial support and monensin, and Carles Pfizer Co. Terre Haute, IN for vitamins A and D.

³ Dept. of Animal Science.

⁴ Dept. of Preventive Medicine.

⁵ Fellowship provided by the Rockefeller Foundation. Present address: Kasetsart Univ., Bangkok, Thailand.