Dairy Farming ProjectsMacmillan, 1923 - 327 頁 |
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常見字詞
acid acres Adjustments to Particular Alsike amount animals Ayrshire Ayrshire cattle breed breeder buildings bull butter fat calf calves cash cent CHAPTER characteristics charged clean clover condition considerable corn cost Crop index crop rotation crop yields dairy cattle dairy cow dairy farm dairy heifer dairy herd dairy regions dairyman economical ensilage expensive farm business farmer farmstead feed fence fertility field grain grow Guernsey Holstein Holstein cattle Holstein-Friesian hundred inbreeding inventory Jefferson County Jersey keep land Livingston County located machinery manure milk fever months oats obtain offspring ordinarily pasture plow pounds of milk Practicums and Laboratory produce profitable protein Pupil purchase pure bred cattle quantities raise ration record result rotation roughage Select sell silage silo sire skim milk soil table of Fig teats udder W-FM W-PD White clover winter young stock
熱門章節
第 65 頁 - Pour this into the bottle with the milk, holding the bottle in a slanting position. The acid will then carry down any milk left in the neck and follow the glass surface to the bottom of the bottle and form a layer under the milk. Hold the bottle by the neck and...
第 65 頁 - Whirl one minute. The fat should then form a clear column in the neck of the bottle. Reading the percentage. — Keep the fat warm so that it will be in a fluid condition. Hold the bottle by the upper end of the neck, letting it hang in a perpendicular position, on the level with the eye. Read the mark or graduations at the extreme top and bottom of the fat column. The difference between these is the percentage of fat in the milk.
第 65 頁 - A little practice should make anyone proficient with the pipette. It is best always to make this test in duplicate; hence two bottles are needed for each lot of milk. Using the acid. — The acid is very strong and must be handled with great care. If any gets on the hands, face or clothing, it should be washed off quickly and water should always be ready for this purpose.
第 64 頁 - Quickly put the index finger over the upper end of the pipette and by releasing the pressure allow the milk to run out until its upper surface is even with 17.6 cc mark when the pipette is held straight up and down. Place the point of the pipette a short distance into the test-bottle neck, holding it against the glass and with both pipette and bottle at an angle (Fig.
第 67 頁 - Draw the milk above the mark, as directed. 5. When adding milk or acid to the test bottle, slant the bottle. The liquid will then run down the lower inside of the neck of the bottle, and will not be forced out by outcoming air. 6. Do not hold the bottle so that its mouth points toward yourself or any one else. The action of the acid upon the milk produces great heat. This heat often causes the contents of the bottle to spurt out violently. 7. After adding the acid to the milk, shake the bottle thoroughly...
第 102 頁 - Large at base, the setting well back ; tapering finely to switch ; the end of the bone reaching to hocks or below ; the switch full 2...
第 66 頁 - Ross 1. Be sure to mix the sample of milk thoroughly before drawing it out with the pipette. 2. When measuring a sample of milk with the pipette keep the index finger dry. 3. When measuring a sample of milk keep the mark on the pipette on a level with the eye. The same precaution should be observed when reading the percentage of fat after the test is completed. 4. Do not try to measure a sample of milk by drawing the milk just to the mark on the pipette. Draw the milk above the mark, as directed....
第 64 頁 - Remove the finger to allow the milk to flow into the bottle. Be sure to get every drop of the milk, taking care to drain the pipette and to blow the last drop into the bottle. A little practice should make anyone proficient with the pipette.
第 65 頁 - This change is due to the acid dissolving all the solid constituents of the milk except the fat, which it does not affect. Whirling the bottles. — The bottles are whirled to separate the fat so that it can be measured. They should be hot when whirled. If necessary they may be heated by standing in hot water before being put into the machine. A steam machine is easily kept hot when in use. Other kinds should have boiling hot water placed in them.
第 67 頁 - ... fingers or clothing to get in the path of the bottle cups. 11. Remove all objects from the vicinity of the tester. This will prevent their being hit by the bottle cups when the machine is in motion. 12. If acid is spilled upon anything pour on plenty of water, and then add some alkali such as lime or baking soda to neutralize the acid. 13. Do not leave the acid bottle uncorked. 14. Keep all glassware perfectly clean. 15. After washing the glassware, rinse it thoroughly in clean water to remove...