Present and does not provide any indication of

Info icon This preview shows pages 3–5. Sign up to view the full content.

present and does not provide any indication of quality To measure the [N]*6.25= crude protein o Assessing nutrient content of feeds ether extract (EE) or crude fat Crude fat is the product resulting from extracting a feed with ethyl ether or some other organic solvent or combination of solvents, such as chloroform and ethyl alcohol Results obtained using this procedure are quantitative rather than qualitative in nature No information is provided relating to fatty acid composition o Assessing nutrient content of feeds crude fiber (CF) The analysis for crude fiber involved boiling (refluxing) a known amount of a ground feed sample in a weak acid solution, filtrating and boiling in a weak solution of alkali and filtering and drying; the residue is the CF An attempt to simulate the digestive processes occurring in the stomach and intestine of an animal This procedure estimates less digestible fractions of a feed sample
Image of page 3

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

Cellulose, hemicellulose, xylans, lignin, and other components associated with fibrous CHO o Assessing nutrient content of feeds ash Inorganic minerals are estimated by the ash value, which is determined by burning a feed sample at a temperature of 350-600 C until nothing is left but metallic oxides or contaminants such as rocks and soils No qualitative information is provided so the specific mineral components are not determined Additionally, procedures, such as atomic absorption and spectrophotometry are used to determine the levels of individual minerals o Assessing nutrient content of feeds nitrogen free extract (NFE) Nitrogen free extract is calculated and not actually determined using a laboratory procedure The NFE is an estimate of the available CHO (sugar, dextrin, starch) Developed at a time when there were no quick, simple analytical methods to determine starch content NFE values for grains and components high in sugar and starch are a reliable estimate of the readily available CHO They do not work well with feeds high in hemicellulose o Assessing nutrient content of feeds NDF and ADF NDF- Neutral Detergent Fiber ADF- Acid Detergent Fiber These methods are becoming more common and are replacing the CF procedure because they more accurately define the CHO components associated with plant materials These determination are not part of the proximate anaylsis Digesitbility of hemicellulose falls between that of starch and sugar and that of cellulose, so the NDF/ADF procedure provide a more accurate estimate of how well a feed is being digested o Assessing nutrient content of feeds energy The energy content of a feed is obtained by using an Oxygen Bomb Calorimeter A small sample of known weight is placed in the OBC and filled with oxygen under pressure The bomb is placed in a container of water of known volume, the sample ignited, and the change in water temperature is monitored to determine energy content of the sample.
Image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.
  • Spring '18
  • Russel Muntifering
  • feed

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern