North Dakota State University * Dickinson Research Extension Center
1133 State Avenue, Dickinson, ND 58601 Voice: (701) 483-2348 FAX: (701) 483-2005
FEEDING LIQUID WHEY IN SWINE FATTENING RATIONS
The disposal of liquid whey, a by-product of cheese manufacture in North Dakota cheese plants, has been a problem. Its resistance to decomposition in sewage systems has made it necessary to find other means as disposal. Its use as a fertilizer is of limited value. However, it can be used in swine feeding to provide necessary protein.
This trial was designed to investigate the use of liquid whey as a supplement in swine fattening rations. In this experiment, whey, soybean oilmeal and lysine are compared, as supplements to a basic barley and oats fattening ration. Pigs of two starting weights were used, and were fed in concrete drylot, and on winter wheat pasture. The pigs were started on whey gradually, and did not develop any scouring.
Picked up daily, the whey was stored in a fiber glass tank, and was self-fed in the sour form through a gravity flow system and nipple waterers. Those pigs receiving whey were not allowed water after the second week, their entire liquid intake coming from the whey. The whey was furnished at no cost by the Dickinson Cheese Company. A charge of ½ cent per gallon was made to cover transportation costs.
Although the utilization of whey was impossible to measure accurately because of waste in feeding, it amounted to approximately 3.00 gallons per pig per day. This is an agreement with figures for liquid consumption as presented by the National Research Council.
The rations as they were fed and the cost per ton of finished feed is shown in table 7. Summer feeding trial results have been summarized in table 8. Table 9 summarizes results for three years.
|Table 7 - Rations as fed, summer hog trials - 1975|
|Soybean oilmeal, lbs.||100||---||---|
|1Includes: Limestone 9 lbs., di-cal 9 lbs., trace mineral salt 5 lbs., vitamin B complex 1 lb., vitamin A, 14 gms. vitamin D3 and 180 gms. zinc sulfate per 1000 pounds feed.|
|Table 8 - Weights, gains and feed cost, summer hog trials, 1975|
|Initial wt., lbs.||34||54||32||53||33||53|
|Final wt., lbs.||186||200||207||192||199||220|
|Avg. daily gain, lbs.||1.18||1.28||1.35||1.22||1.28||1.47|
|Feed/cwt gain, lbs.||273||287||371||369||408||384|
|Feed cost/cwt gain, $||17.14||18.02||24.48||24.35||26.36||24.81|
|Initial wt., lbs.||33||53||32||54||32||53|
|Final wt., lbs.||201||196||231||223||216||218|
|Avg. daily gain, lbs.||1.30||1.27||1.54||1.50||1.43||1.46|
|Feed/cwt gain, lbs.||286||262||334||328||319||355|
|Feed cost/cwt gain, $||17.96||16.45||22.04||21.65||20.61||22.93|
|Table 9 - Three year average for weight, gain and feed cost, 1973-75|
|Initial wt., lbs.||35||51||34||51||35||51|
|Final wt., lbs.||190||205||200||211||192||217|
|Avg. daily gain, lbs.||1.22||1.31||1.30||1.36||1.24||1.42|
|Feed/cwt gain, lbs.||285||297||410||397||395||386|
|Feed cost/cwt gain, $||14.49||14.89||20.78||19.85||20.74||20.41|
Summary: Three years of data indicates that pigs can be raised to slaughter weights very efficiently and economically when using liquid whey as a protein supplement. Pigs that were fed whey required 100 pounds less feed per 100 pounds gain in 1975. Feed savings for the three year period amounted to 107 pounds less feed/100 pounds gain, which amounted to a savings of approximately $5.60/100 pounds gain over the soybean fed pigs and $5.80/100 pounds gain over the lysine supplemented pigs.
Liquid whey feeding will be most successful when the following conditions exist: whey is available on a regular basis; the pigs weigh at least 35 pounds; PVC plastic or stainless steel feeding equipment is used to reduce corrosion, contamination, fly, and odor problems; and adequate protection from the weather is provided.