Lesson 8 - Digestive System of the Horse

Title Lesson 8: Digestive System of the Horse Student Learning Objectives As a result of this lesson, the student will be able to… 1. Understand the Modified Monogastric Digestive System and how each component operates. 2. Be able to readily identify the animals that utilize a Modified Monogastric Digestive System. Time: Instruction time for this lesson: 50 minutes. Tools, Equipment, and Supplies • Computer equipped with Power Point and Projector. • Copies of Student Note Outline Key Terms. The following terms are presented in this lesson and appear in bold italics: 1. Modified Monogastric 2.Masticate 3. Esophagus 4Small Intestine 5.Large Intestine 6.Cecum Interest Approach Over the past few days we have discussed ruminant and monogastric digestive systems. Today we are going to discuss a digestive system that is similar to monogastric but at the same time very different. It also has some features found in the ruminant digestive system. Can anyone guess what this system is called? Modified Monogastric System. -Excellent Answer What type of digestive system does a horse have? Monogastric that is modified Excellent Although, in the previous lessons we learned that monogastric animals could not digest fiber (cellulose) very well. So how is it possible for horses to consume hay? I believe that we need to investigate this a little closer. (Lead this mystery into the lesson on Modified Monogastric Systems) Summary of Content and Teaching Strategies Objective 1 Understand the Modified Monogastric Digestive System and how each component operates. Objective 2 Be able to readily identify the animals that utilize a Modified Monogastric Digestive System. -Refer to power point presentation and student note outline. -All information needed for the presentation is available for the instructor on the power point presentation. As you go over the presentation have the students complete the note outline that corresponds with the power point. Review/Introduction: Showing slides 1-3 Class the Modified Monogastric System functions exactly the same as the Monogastric System with the exception of the Cecum. They have an enlarged Cecum where fermentation occurs. Slide 4-5 A modified monogastric animal starts the first step in the digestion process through the obtaining, mastication and moistening the food in the mouth. Horse owners need to pay special attention to the teeth structure of their animal. Have them “floated” as the need arises. This will enable them to utilize and obtain their food in an efficient manner. Slide6-10- Refer to PowerPoint for exact information. Add the following as you see fit The Horse has an esophagus around 50 inches long. One interesting fact is that their esophagus will not allow them to vomit. There stomach will burst before they will vomit. Horse has a relatively small stomach thus if they eat to fast the majority of their food is not digested. Slides 11-16Modified Monogastric Animals can utilize the majority of feeds and nutrients if presented in the proper quantities and qualities. Processing, grinding and crimping their feed increases the amount that they can utilize. Also if the animal is active it will actually increase their digestion ability. Slide 17 Review over the basic differences between monogastric and modified monogastric animals. Review/Summary E-moment Use the Eye Witness Moment: Students need to pair up and start thinking about the major differences between monogastric and modified monogastric animals. Have them report on this amazing drastic life changing event for the monogastric animals to convert to modified monogastric digestive system. Have them include in their new cast the new and delicious feeds that can now be digested by this animal. Then switch roles so each student has an opportunity to present their findings. SAE activity: Have students relate this knowledge to personal S.A.E. projects and how they can improve their S.A.E. through their knowledge. Evaluation. -refer to attached Modified Monogastric Digestive System Quiz -Refer to attached Digestion exam (Covers lessons 6-10) Answers to Assessment: -Refer to Quiz Key -Refer to attached Digestion Exam Key Modified Monogastric Digestive System Quiz Name___________________________________________Date____________________ Score________________/ 1. ________________________ will not allow vomiting. 2. The ________________________ contains 30% of the capacity of the entire tract. 3. ____ _________________ work actually increases digestion in modified monogastric animals. 4-9 Identify the function of each of the label parts of the Modified Monogastric System. Refer to the illustration below. 4. Mouth5. Esophagus6. Stomach7. Small Intestine8. Large Intestine9. Colon- Modified Monogastric Digestive System Quiz Name__________KEY_________________________________ Date____________________ Score________________/ 4. ______Esophagus______ will not allow vomiting. 5. The ______Small Intestine______ contains 30% of the capacity of the entire tract. 6. ____Light_________________ work actually increases digestion in modified monogastric animals. 4-9 Identify the function of each of the label parts of the Modified Monogastric System. Refer to the illustration below. 4. Mouth-Masticate food and moisten with saliva 5. Esophagus-Transport food to stomach 6. Stomach- Mix food, immerse in digestive juices 7. Small Intestine- Majority of nutrient absorption occurs here 8. Large Intestine Water is absorbed 9. Colon- Bacteria present that aids in breaking down high fiber feeds