Dairy Feeds

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Dairy Feeds Feeding

• The Digestive System of the Cow

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I. Nutrient Digestion
A. Defined The processes involved in the
conversion of various feed nutrients into forms
(end products) that can be absorbed from the
digestive tract.
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B. End Products of Digestion

• Nutrient End Product
• Protein Amino Acids
• Starch Glucose
• Sucrose Glucose and Fructose (Converted to
  glucose upon absorption)
• Lactose Glucose and Galactose (Converted to
  glucose upon absorption)
• Cellulose Organic Acids and Slats of Organic
  Acids
• Fats Fatty Acids and Glycerol, some soap
• Minerals Any soluble form
• Vitamins Any soluble form

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C. Digestive Juices

• 1. Defined Fluid materials secreted into the
  digestive tract by glands or tissues along the
  digestive tract.
• 2. Includes
• a. Saliva
• b. Gastric Juice
• c. Bile
• d. Pancreatic Juice
• e. Intestinal Juice

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D. Enzymes

• 1. Defined Enzymes are organic catalysts.
  Most are protein in makeup. They are usually
  specific with respect to substrate and medium
  requirements.
• 2. Includes
• a. Salivary amylase g. Trypsin
• b. Salivary maltase h. Pancreatic lipase
• c. Rennin i. Intestinal peptidase (erapsin)
• d. Pepsin j. Intestinal maltase
• e. Gastric lipase k. Sucrase
• f. Pancreatic amylase l. Lactase

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II. Nutrient Absorption

• A. Movement of the end products of digestion
  from the digestive tract into the blood and/or
  lymph system.
• B. Occurs by diffusion through the
  semi-permeable membrane that line the digestive
  tract.
• C. Non-ruminants, most nutrient absorption takes
  place in the small large intestine. Villi of
  the S.I. Facilitate this absorption.

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• D. Ruminants, a large amount of absorption also
  takes place through the rumen wall.
• E. With the exception of fat the end products of
  digestion are absorbed directly into the blood
  stream.
• F. The end product of fat digestion is absorbed
  into the lymph system.

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III. Nutrient Transport

• A. Defined The movement of nutrients from the
  point of absorption to the point of utilization.
• B. The blood is the primary basis for the
  transport of nutrients and other materials in the
  animal body.
• C. The lymph serves as the final link between
  the blood capillaries and the individual cells.
• D. All nutrients are transported in solution in
  the water soluble form.

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FINALLY DONE!