Skip to main content
ARS Home » Plains Area » Clay Center, Nebraska » U.S. Meat Animal Research Center » Nutrition and Environmental Management Research » Research » Publications at this Location » Publication #326281

Research Project: Improved Nutrient Efficiency of Beef Cattle and Swine

Location: Nutrition and Environmental Management Research

Title: The effects of feeding increasing concentrations of corn oil on energy metabolism and nutrient balance in finishing beef steers

Author
item Hales, Kristin
item Foote, Andrew
item Brown Brandl, Tami
item Freetly, Harvey

Submitted to: Journal of Animal Science Supplement
Publication Type: Abstract Only
Publication Acceptance Date: 4/21/2016
Publication Date: 7/11/2016
Citation: Hales Paxton, K.E., Foote, A.P., Brown-Brandl, T.M., Freetly, H.C. 2016. The effects of feeding increasing concentrations of corn oil on energy metabolism and nutrient balance in finishing beef steers [abstract]. Journal of Animal Science. 94 (E-Supplement 5):724.

Interpretive Summary:

Technical Abstract: The use of added fat source is common in high-concentrate finishing diets. The objective of our experiment was to determine if feeding increasing concentrations of added dietary corn oil would decrease enteric methane production, increase the ME:DE ratio, and improve retained energy in finishing beef steers. Four treatments were used in a replicated 4 × 4 Latin square (n = 8; initial BW = 397 kg ± 3.89). Data were analyzed using a Mixed model with the fixed effects of period and dietary treatment and random effects of square and steer within square. Treatments consisted of: (1) 0% added corn oil (Fat-0); (2) 2% added corn oil (Fat-2); (3) 4% added corn oil (Fat-4); (4) 6% added corn oil (Fat-6). Dry matter intake or GE intake did not differ across diets (P > 0.39). As a proportion of GE intake, fecal energy loss and DE loss did not differ by treatment (P > 0.27); however, urinary energy loss tended to decrease linearly as corn oil increased in the diet (P = 0.09). Additionally, methane energy respired decreased linearly as corn oil increased in the diet (P < 0.01). No differences were detected in ME loss as a proportion of GE intake (P > 0.98); however, the ME:DE ratio increased linearly as corn oil increased in the diet (P < 0.01). No differences in retained energy or heat production as a proportion of GE intake were noted (P > 0.59). Dry matter digestibility did not differ across diets (P > 0.36). Digestibility of NDF as a proportion of intake responded quadratically increasing from 0% corn to 4% corn oil and decreasing thereafter (P = 0.02). Furthermore, ether extract digestibility as a proportion of intake increased quadratically, increasing from 0 to 4% corn oil inclusion before reaching a plateau (P < 0.01). No differences were detected in OM digestibility across treatments (P > 0.35). From these data we interpret that adding dietary fat decreases urinary energy loss and enteric methane production while decreasing NDF digestibility when included at more than 4% of dietary DM. Moreover, the ME:DE ratio increases linearly as dietary fat increases.