Nutritive Value of Feedstuffs - Nutritive Value of...

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Nutritive Value of Feedstuffs Before formulating a balanced dietary ration for an animal or group of animals, one must know the dietary needs of the species, specific to maturity and gender, as well as the nutrients available in the feeds. Environment, activity level, and desired results must also be taken into account. Using proximate analysis of feedstuffs, it is possible to learn the amount of water, crude fat, crude fiber, crude protein, ash, and nitrogen-free extracts of feeds. The amount of water is found by drying the feed, then subtracting the dry matter from the original weight. Crude fat is measure in terms of ether extract; fat is soluble in ether. Crude fiber consists of the cellulose, lignin, and hemicellulose in the sample. The amount of ash is found by burning the remaining materials at 700°F; the leftovers are the mineral ash. Nitrogen-free extract levels must be obtained mathematically; it is a measure of the sugar and starches, as well as some soluble hemicellulose, in feed. An approximate measure of the total (crude) protein in a feed is taken by multiplying the amount of nitrogen by 6.25. The true protein may by considered the digestible protein, that is the amount of protein available to be absorbed and utilized by the animal, which is usually somewhat less than the total protein. Higher quality feeds have larger amounts of digestible proteins. It is possible for an animal to meet its full requirement of protein and still not show proper growth. If an animal has an energy deficiency in its diet, the body will use the protein consumed for energy. If the protein is of very poor quality or incorrect digestibility, the animal
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This note was uploaded on 04/01/2008 for the course AN SC 001 taught by Professor Olver,dalehagen,danielr during the Fall '07 term at Pennsylvania State University, University Park.

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Nutritive Value of Feedstuffs - Nutritive Value of...

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