Project Details:

Use of high oleic acid soybean oil in feedlot rations

Parent Project: This is the first year of this project.
Checkoff Organization:Oklahoma Soybean Board
Categories:Animal Nutrition, Industrial use – Oil, Animal Health
Organization Project Code:
Project Year:2020
Lead Principal Investigator:Andrew Foote (Oklahoma State University)
Co-Principal Investigators:

Contributing Organizations

Funding Institutions

Information and Results

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Project Summary

Over half of the cattle in the feedlots receive added fat in their diets (Samuelson et al., 2016) which equates to approximately 950 million pounds of fat a year. Currently, soybean oil is not commonly used in these diets. It is commonly thought that the negative effects of unsaturated fatty acids, such as those in soybean oil, are toxic to rumen microbes and disrupt digestion (McAllan et al., 1983). Some of our recent research shows that a fatty acid that is present at high concentrations in soybean oil (linoleic acid) is associated with decreased feed efficiency and inflammation in the rumen (Artegoitia et al., 2017; Reynolds et al., 2017). Interestingly, most of the current knowledge base of feeding unsaturated fatty acids to cattle is based on polyunsaturated fatty acids, and very little is known about feeding monounsaturated fatty acid sources such as high oleic soybean oil. There is a need to evaluate the utility of high oleic soybean oil in feedlot rations and its effect on rumen fermentation and total nutrient metabolism. Failure to evaluate the use of this product will limit future utilization of soybean byproducts in the feedlot industry. Further understanding of the proper inclusion of commodity soybean oil will also likely increase its usage in feeding beef cattle. Increasing the potential uses of commodity soybean oil and high oleic soybean oil will likely increase the value of soybeans sold by farmers.

Project Objectives

The overall objective of this proposed experiment is to determine the effects of increasing concentrations of commodity and high oleic soybean oil on feed intake and nutrient digestion in cattle consuming a high-concentrate finishing ration. Our hypothesis is that high oleic soybean oil will increase the energy intake of cattle and not disrupt nutrient digestion which will occur with high levels of commodity soybean oil. Knowledge of the use of high oleic acid soybean oil will provide the base knowledge for nutritionists to incorporate this product in feedlot rations.

Project Deliverables

The experimental design for this experiment is a 5x5 Latin square. Treatments include source of dietary fat (commodity soybean oil or high oleic soybean oil) and concentration (3% or 6% of diet dry matter) arranged in a 2x2 factorial with the addition of a negative control (no added fat).

Ruminally cannulated steers (n = 5 total) will be utilized for this experiment. Cattle will be randomly assigned to a sequence of treatments so that they receive all treatments over a term of 5 periods. Cattle will be adapted to the respective diet for 14 days followed by a 5-day collection period. Diets will be fed ad libitum once daily. Rations and refusals will be sampled each day and composited by period. During the 5-day sample collection period, total feces and urine will be collected and sampled as previously described (Hales et al., 2017). By collecting total urine and feces, we will be able to estimate the digestion and metabolism of the rations (dry matter, organic matter, energy) and individual nutrients (fiber, starch, nitrogen, and fat). Additionally, to determine the effects of the source and amount of fat on rumen metabolism specifically, we will perform an in situ digestibility trial to measure rumen degradability of the rations using previously published guidelines (Vanzant et al., 1998) and established methods in our lab. Rumen fluid samples will be collected from the ventral rumen at increasing intervals following feeding to evaluate volatile fatty acid production (Foote et al., 2013).

Progress of Work

Final Project Results

Benefit to Soybean Farmers

Performance Metrics

Project Years

YearProject Title (each year)
2020Use of high oleic acid soybean oil in feedlot rations