=Quantity Stick Produced.=--The quantity of stick it is possible to produce is indicated in the following table: ANNUAL PRODUCTION TANK WATER AND STICK. ====================================================== Basis for Approximate Killing Approximation Head ------------------------------------------------------ Cattle 208,304 1 to 1 208,304 Calves 36,474 7¹⁄₂ to 1 4,863 Sheep 416,325 7¹⁄₂ to 1 55,510 Packer Hogs 496,219 2¹⁄₂ to 1 231,569 Shipper Hogs 45,094 5 to 1 9,019 ------- Total approximate killing 509,265 Gallons tank water saved 4,912,484 Gallons tank water per approximate head 9.64 Pounds of Stick made 2,766,648 Pounds of Stick made per approximate head 5.43 The relative quantity of Stick to dried fertilizer produced is about 40%, but the stick is more valuable due to its higher ammonia content and the mixture of the stick with the standard fertilizer increases the value per ton of the fertilizer. CHAPTER XVI. FERTILIZER. FERTILIZER -- BLOOD -- RECEIVING TANK -- COOKING -- PRESSING -- PURITY -- STORING -- QUICK HANDLING -- TANKAGE -- QUOTATIONS AND VALUE -- GREASE -- INFLUENCE OF STICK -- DIGESTER TANKAGE -- SLIME -- DRYERS -- DRYING -- EXPENSE FOR DRYING -- COMMERCIAL FERTILIZER -- STATE REGULATIONS -- MIXING MATERIALS -- CONVERSION FACTORS. =Fertilizer.=--In this department we discuss the manipulation of the products after leaving the tanking process in the case of tankage, and of blood, beginning with its release from the animal. =Blood.=--The sources of the collection of blood are from animals slaughtered, viz: cattle, sheep, calves and pigs. In nearly every instance this is collected at a given point near the sticking rails and transferred to the fertilizer department for processing. It is rather difficult to pump blood, although it can be readily done with a ball valve pump, or a centrifugal pump. The latter is satisfactory if foreign substances can be kept out, and if the reservoir can be situated high enough so that the blood can gravitate to the suction of the pump. Mechanical agitation is a benefit in the receivers. A very satisfactory way to handle blood is by means of a blow tank. This is a tight, heavily constructed cylinder with an admittance valve on the inlet pipe, and a closing valve on the discharge pipe; the latter preferably a quick opening valve. A means for admitting air or steam to the blood is arranged. To operate, the valve on the inlet line as well as the outlet valve is closed, and air or steam pressure is built up as required for the lift. The outlet valve is then quickly opened when the contents of the tank is virtually “shot” to the receiving tanks.