Livestock Nutrition:Digestive System Created by: Arlene Barrett, Dennis Bratton, Mariah Gumphery ,Haley Vrazel
Objectives • Summarize terms related to digestive system. • Review the digestive system.
Terms • Nutrient • Nutrition • Gastrointestinal Tract • Digestive Stystems
Nutrient • A substance or group of substance of similar chemical structures that aid in the support if life.
Nutrition • A science that deals with the way an animal brings in a feed stuff and utilizes it through various processes and metabolic activities.
Gastrointestinal Tract • A tube that allows feed stuff to be stored (middle) digested (middle), absorbed (middle) and excreted (exit). • A tube with a hollow cavity with a portion in the middle with cavities that are followed with an outlet.
Digestive Systems • Man and pig have a simple stomachs (non-ruminants) with an extensive intestinal system • Ruminants have a complex stomach with a simpler intestinal system
Digestive System • Mouth: “Prehension” tool (grasps food) • Salivary glands secrete juices containing enzymes (digest food) • Chewing food breaks down • Esophagus: muscular tube that connects mouth to stomach • Peristaltic Movement: sequential contraction of ringlike muscles • Reverse Peristalsis = vomiting
2 Major Digestive Systems • Both systems will be addressed in detail in the lesson to follow: • Ruminants (Polygastrics)—have four stomach compartments • Non-Ruminats (Monogastrics)—have one stomach compartment
Digestive System • Small Intestine: long coiled tube connecting stomach to large intestine • rest of the digestion and absorption takes place here • surface covered with villi (increase surface area and absorption) • Large Intestine: Cecum, colon, rectum • absorbs water (makes feces more solid) • some vitamins and minerals absorbed here
Digestive System • Accessory organs: • Pancreas secretes enzymes to break down fat • Liver (largest internal organ) secretes bile, which digests fats • also stores iron
Review • Summarize terms related to digestive system. • Review the digestive system.
Lab Activity • Students will illustrate the swine and cattle digestive system.