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

K. E. Hales, A. P. Foote, T. M. Brown-Brandl, H. C. Freetly

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The use of an added lipid 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 recovered energy (RE) in finishing beef steers. Four treatments were used in a replicated 4 × 4 Latin square (n = 8; initial BW = 397 kg ± 3.8). 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, DE, and urinary energy loss did not differ by treatment (P ≥ 0.27). Additionally, methane energy produced 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 (P < 0.01; 93.06, 94.10, 94.64, and 95.20 for Fat-0, Fat-2, Fat-4, and Fat-6, respectively) as corn oil inclusion increased in the diet. No differences in RE or heat production as a proportion of GE intake were noted (P ≥ 0.59) and 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 responded quadratically, increasing from 0% to 4% corn oil inclusion before reaching a plateau (P < 0.01). As a proportion of GE intake, RE as protein decreased linearly as corn oil was increased in the diet (P < 0.01). As a proportion of total energy retained, RE as protein decreased when corn oil increased from 0% to 6% of diet DM (P < 0.01). Similarly, RE as fat and carbohydrate as a proportion of GE intake increased linearly as corn oil increased in the diet (P = 0.05). From these data, we interpret that adding dietary fat decreases enteric methane production and increases the ME:DE ratio, in addition to increasing the amount of energy retained as fat and carbohydrate.

Original languageEnglish
Pages (from-to)939-948
Number of pages10
JournalJournal of animal science
Volume95
Issue number2
DOIs
StatePublished - Feb 2017

Keywords

  • Dietary fat
  • Energetics
  • Finishing cattle

Fingerprint Dive into the research topics of 'The effects of feeding increasing concentrations of corn oil on energy metabolism and nutrient balance in finishing beef steers'. Together they form a unique fingerprint.

Cite this