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Swine > Feeding & Nutrition

QUESTION
I am considering looking for a PTO powered soybean extruder. What can you tell me about feeding extruded soybeans to hogs? How will this affect rate of gain and feed efficency? How good of job does this equipment do or would I be ahead to roast the beans then grind them with a grinder mixer and what size screen would one use? Thankyou!


ANSWER

Dear Bob:

I am attaching a paper on the use of "Extruded Soybeans in Swine Diets." It is in a Word '97 file and I hope you will be able to open it. It will answer a lot of your questions about feeding extruded soybeans to hogs. If you are unable to open this file, please send me your mailing address and I will mail you a copy of the paper. Also, the following information should be of interest to you:

The economic feasibility of feeding extruded soybeans to swine is affected by the differences in nutrient content compared to soybean meal, the need to increase the protein in diets containing whole soybeans, the value of extra fat and the cost of processing. In order to determine if using extruded soybeans is economically feasible, the following equation can be used:

A = .86 Y + .18 Z -(S+C), where A = Cost advantage of extruding soybeans Y = Cost of a ton of soybean meal (44%) Z = Value of a ton of supplemental fat S = Value of a ton of soybeans C = Cost of extruding a ton of soybeans

.86 comes from 38 divided by 44 (38% protein in soybeans and 44% protein in soybean meal); .18 is for 18% extractable fat from soybeans. The cost advantage of extruded beans depends on the relative value of soybean meal and soybeans (holding supplemental fat constant at 15" per pound and extrusion cost at $40 per ton of soybeans): It requires 35 bushels of whole full-fat soybeans to make a ton of extruded beans due to the loss of moisture (5%) during the extrusion process.

Sincerely, Gilbert Hollis Extension Swine Specialist







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