Roasted soybeans are a common ingredient in the diets of dairy cows because they are a great source of fat and protein, including protein that escapes the rumen, according to researchers with The Pennsylvania State University.
Farm-grown and locally available soybeans and on-farm or local roasting make soybeans an economical ingredient in many situations, Penn State said in an announcement.
Until recently, farmers had to decide only how to process soybeans and how much to feed, but now they also have the opportunity to choose high-oleic acid soybeans that bring additional advantages in dairy rations, according to Kevin Harvatine, associate professor of nutritional physiology in the Penn State College of Agricultural Sciences.
Harvatine said soybeans contain about 20% fat, and normal soybean fat is high in polyunsaturated fatty acids, which are less stable and, therefore, prone to becoming rancid more quickly.
For many years, soybean oil was hydrogenated to make margarine, shortening and frying oils, but more than a decade ago, we realized the trans fats in these were very bad for us and increased heart disease, among other things, he said. Oleic acid is an unsaturated fatty acid and is much more stable when frying and storing, which sparked interest in breeding soybeans high in oleic acid and low in polyunsaturated fat.
There is a long history of selecting plants to increase oleic acid concentration. The best known is canola, which is rapeseed that was selected for high oleic acid levels to improve the healthfulness of the fat, Harvatine noted. Normal plant-breeding methods were also very successful in increasing oleic acid in sunflower and safflower oil, with some varieties containing more than 80% oleic acid.
However, normal plant breeding methods failed to create a high-oleic soybean, Harvatine pointed out, so high-oleic varieties that contain about 75% oleic acid and less than 10% polyunsaturated fat were created using genetic engineering approaches. The brand names are Plenish from Pioneer and Vistive Gold from Bayer.
High-oleic acid soybeans have been grown for a number of years but only recently have been widely available to grow outside of contracts, he said. The seed sells for a comparable price to normal seed and does not differ in yield or protein and fat concentration, so the cost of production is comparable.
Roasted high-oleic acid soybeans have benefits for dairy cows, Harvatine explained, adding that polyunsaturated fatty acids are toxic to rumen microbes and disrupt normal rumen function, leading to production of bioactive fatty acids that cause milk fat depression. We expect oleic acid to be lower risk, and recent studies both at Penn State and the University of Wisconsin demonstrated that high-oleic acid soybeans were lower risk for causing diet-induced milk fat depression, he said.
A recent study conducted by Harvatine at Penn State, funded by the Pennsylvania Soybean Board, compared feeding dairy cows normal versus high-oleic acid roasted soybeans at 5% and 10% of the diet. Soybean type and level had no effect on milk yield, but high-oleic acid soybeans resulted in 0.17 units higher milk fat concentration and 0.2 lb. higher milk fat yield.
This increase was explained by a decrease in diet-induced milk fat depression, and increasing the level of roasted soybeans from 5% to 10% of the cows diet increased milk fat 0.2 units, Harvatine said, likely because the diet contained a low level of fat relative to the production level of the cows.
Research on the benefits of high-oleic acid soybeans in dairy cow diets at Penn State is continuing. Harvatines research group currently is conducting additional experiments funded by the Pennsylvania Soybean Board to determine the optimal level of high-oleic soybeans. It is clear that high-oleic acid soybeans decrease the risk of diet-induced milk fat depression, he said.
We would expect to see the largest effect in herds with lower milk fat. However, some cows in every herd have lower milk fat and would be expected to benefit, he said. In addition, feeding high-oleic acid soybeans may allow increased use of other economical byproducts that are higher in polyunsaturated fat, such as distillers grains.
High-oleic acid soybeans are one of the new ingredients available to farmers interested in designing a diet that is energy-dense while minimizing risk for rumen disruptions and diet-induced milk fat depression, Harvatine said, adding, Because price, agronomics, fat and protein concentration are equivalent, there are few downsides to growing or feeding high-oleic acid soybeans. As a new variety, they are not available everywhere, but it is likely that farmers will see them soon, if they have not already.
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High-oleic acid soybeans offer benefits to dairy cows - Feedstuffs
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