Early chill may impact sugar beet quality
Panhandle Research and Extension Center
Temperatures dropping below 15 degrees in early October may have put some sugar beets in western Nebraska at risk of decaying at the crown. When decay begins in the beet before it can be processed, it makes the beet unacceptable for sugar production for human consumption.
Sugar beets not fit for human consumption can be an economical source of feed for beef cattle. But producers should be aware of how sugar beet nutrient content compares to other common feeding rations such as corn and beet pulp, and also how the rotting process affects the beets’ nutrient quality.
In a University of Nebraska research trial, gestating cows performed similarly when their rations were changed, using 20% sugar beets (dry matter basis) to replace 20% corn. When growing calves were fed 44% sugar beets (dry matter basis) they were more efficient than calves receiving corn. In a finishing diet however, when sugar beets replaced corn up to 15%, cattle had reduced performance compared to 0% sugar beets.
When sugar beets begin to rot, sugars are lost rapidly. Analyzed for water-soluble carbohydrates, rotting sugar beets were found to contain only 26.9%, compared to 73% in fresh chopped beets. Fat-soluble carbohydrates were 22.7% in rotting sugar beets compared to 69.5% in fresh chopped beets.
Therefore, mixing chopped rotting sugar beets with straw or poor-quality hay as soon as possible will help reduce sugar loss. An effective method is mixing 10% poor-quality roughage and 90% sugarbeets (on an as-is or actual pounds basis) and packing in a bunker or ag bag.
The nutrient quality of chopped sugar beets is different from that of sugar beet pulp, the by-product of sugar production. Sugar beet pulp has a crude protein content of 10%, while sugar beets will likely be 4.5%. The neutral detergent fiber content of sugar beet pulp is about 45%, compared to only 15% in sugar beets, making the beet a more comparable substitute for corn in the diet than a fiber source.
A protein source such as distillers grains or alfalfa would need to be included in a diet with a mixture of poor quality hay or residue and rotting sugar beets. The amount of sugar left in the rotting sugar beet will vary, but assuming they have lost 10% of their original sugar, and mixed with residue or poor hay in the proportions mentioned above, then the mixture could have a total digestible nutrients (TDN) value of about 64%.
For assistance developing diets containing chopped sugar beets, contact University of Nebraska extension personnel. ❖