These experiments prove that we must keep somewhere near a balanced ration but do not prove anything regarding a definite value of skim as a feed. What your skim milk is worth on the farm depends altogether on how much it is needed to balance the diet in hog feeding operations. It is of much more value for little pigs than for larger hogs that are more capable of digesting grasses. Professor Henry says, “Pigs fed skim milk and grain gained nothing from pasture. Grazing stimulates the appetites of pigs getting grain but no milk and they eat more grain and make larger and more economical gains.” So we see that pigs will pass up pasture for milk and that when milk is fed to pigs on pasture it replaces the use of pasture so that it does not do much good to pasture hogs that are fed milk. Experiments reported on page 614 show that pigs on alfalfa pasture require 344 pounds of grain to gain one hundred pounds and that on rape pasture only 340 pounds are required. Different experiments always vary slightly as to the amount of grain required to make a certain growth. But taking the most advantageous ration that we can prepare with milk and corn as shown by these experiments, we may conclude that something like 300 pounds of grain and 500 pounds of milk will make one hundred pounds of growth on one hundred pound hogs, and that about 350 pounds of grain fed to hogs on pasture will make the same amount of growth. Let each farmer figure out what pasture and grain cost him and he can get approximately the real value of skim milk. For large hogs milk will be worth less than here shown. For smaller hogs it will be worth more. It may be interesting to know the cost per pound of skim milk solids figured at different prices, but the chemical analysis we are not considering. One hundred pounds of milk usually contains about 9.25 pounds of solids. If 100 pounds of skim milk is worth $.20, one pound of dry matter would be worth $.0216 and a ton would be worth $43.20. At $.40 a hundred, one pound of dry matter would be worth $.0432 and a ton would be worth $86.40. At $.50 a hundred, one pound of dry matter would cost $.0540 and one ton cost $108.00. =Whey.= The average composition of whey is about as follows: water 93.12%, and total solids 6.88%. Of the total solids there are about .27% fat, .81% nitrogenous substances and 5.80% sugar, ash, etc. For pigs whey has a feeding value about half that of skim milk. CHAPTER X. MARKET MILK =Weight of Milk.= The weight of milk varies slightly with the temperature and also because of the difference in the amount of solids it contains. An average gallon of milk at 60 degrees weighs 8.6 pounds. A ten-gallon can filled to the lid should weigh 86 pounds.