. Department bulletin. Agriculture; Agriculture. 6 1144, U. S. DEPAETMKNT OF AC, UHTLTURE. It is evident that high^producing cows need more feed than low- producing cows. It is conceivable that production may be limited by lack of sufficient feeds of the proper kind. How far it is possible to increase production by supplying more feed is a question which can be answered only by trial, but it was acknowledged by some of the farmers reporting that their cows gave, in 1920, less milk than usual because of restricted grain feeding owing to relative prices of feeds and milk. The higher y
. Department bulletin. Agriculture; Agriculture. 6 1144, U. S. DEPAETMKNT OF AC, UHTLTURE. It is evident that high^producing cows need more feed than low- producing cows. It is conceivable that production may be limited by lack of sufficient feeds of the proper kind. How far it is possible to increase production by supplying more feed is a question which can be answered only by trial, but it was acknowledged by some of the farmers reporting that their cows gave, in 1920, less milk than usual because of restricted grain feeding owing to relative prices of feeds and milk. The higher yields must usually be obtained by increased use of concentrates. Cows use digestible protein and net energy for two purposes; first, to maintain their bodies, and, second, for producing milk or flesh. The protein and net energy devoted to the first purpose are called the maintenance requirements and the feed supplying them the " maintenance ;' Whatever digestible protein and net energy there may be in the ration above the main- tenance requirements are devoted to production. Milk production. Fig. 1.—Computations of the net energy supplied to cows as reported by farmers com- pared with standard requirements show a very intimate relation between quantity of feed and quantity of milk produced, a relation which liberal feeders turn to their advantage. may be limited by the amount of digestible protein supplied, and as the annual yield increases more attention must be given to this factor (as feeders recognize by adding more grain), especially the high- protein concentrates for their best cows. Total amount of feed, even of a well-balanced ration, may be a limiting factor in milk produc- tion. The amount of milk produced is the basis for feeding cows individually instead of giving the same amount to each. Some feeders still persist in the latter practice. The relation between the maintenance requirements, total require- ments, and milk production at rates up to 13
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