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Evaluation of High Oil Corn and Corn Silage for Lactating Cows¹

University of Illinois, Urbana 61801

ABSTRACT

Forty multiparous Holstein cows in early lactation were used to compare their responses to high oil corn and corn silage with responses to control corn and corn silage. Treatments were total mixed diets containing: 1) 50% control concentrate, 50% control corn silage; 2) 50% high oil concentrate; 50% control corn silage; 3) 50% control concentrate, 50% high oil corn silage; and 4) 50% high oil concentrate, 50% high oil corn silage on a DM basis. Cows fed high oil corn had greater DM intake (21.9 vs. 19.6 kg/d) and ruminal acetate:propionate ratio (2.3 vs. 2.0) than animals fed control corn. Fiber digestibility and yield and composition of milk were similar among grain and silage types. Apparent digestibility of DM was lower for animals on high oil corn than for those fed control corn (69.7 vs. 73.3%). Apparent digestibility of ether extract was lower for animals consuming high oil corn silage than for those fed control corn silage (82.2 vs. 85.9%). De novo synthesized fatty acids in milk fat were reduced, but preformed fatty acids of dietary origin were increased on all diets. Efficiency of milk production was lower for diets containing high oil corn or corn silage. Postpartum body weight recovery was greater for cows fed high oil corn than cows fed control corn, indicating a more favorable energy status for these animals. High oil corn and corn silage allowed both high milk production and the deposition of body tissue.

¹ This study was part of Project Number 35-356 of The Agriculture Experiment Station, College of Agriculture, University of Illinois at Urbana-Champaign. It was supported in part by a gift from Pfister Hybrid Corn Co., El Paso, IL.

² Department of Animal Sciences.

³ Department of Agronomy and Horticulture, New Mexico State University, Las Cruces.

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