Quiz 4 - Quiz 4 ADSC 4360/6360 Ruminant Nutrition April 6,...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Quiz 4 ADSC 4360/6360 Ruminant Nutrition April 6, 2007 Name__________________________________ Choose 2 out of four questions: 1).The microbial ecosystem of the rumen is dense and diverse. Some scientists believe that success of an ecosystem is dependent on its degree of diversity. However, ruminants fed in intensified production systems are fed antibacterial feed additives that decrease diversity of the rumen microbial ecosystem. a. Give three examples of how a beneficial performance response can be related to precluding a specific microbial activity(s) despite negatively impacting rumen microflora diversity. - Inhibiting methanogenesis and increasing h transfer to VFA and energetic efficiency - Decreasing the acetate to propionate ratio and increasing animal energetic efficiency related to storing energy in muscle and adipose tissues, also increasing the glucogenic ratio and insulin would upregulate storage of energy in muscle and adipose tissues -Decreased Proteolysis, peptide breakdown and deamination should provide more bypass or rumen undegradable protein that is needed in faster growing calves and higher milk producing dairy cows -Increasing the acetate to propionate ratio, should increase the ketogenic ratio and induce greater GH levels a partition more nutrients towards the mammary gland - defaunate the rumen: could decrease methanogenesis and decrease rumen microbial protein recycling - effects of specific supplements such as : rumensin, dietary fat especially PUFA - Facultative anaerobes facilitate environment for strict anaerobes b. Give three examples of how microbial diversity can benefit rumen function. Methanogenesis drives the reduction of carbon dioxide and a final step in the metabolic pathway of VFA production. In theory methanogenesis can increase VFA production and microbial protein synthesis. Proteolytic, peptolytic and deamination activities are expressed differently in different bacteria species. Greater dietary protein can be degraded with mixed cultures VS pure cultures of rumen bacteria. Athough calories more limit microbial protein production than ammonia, rumen protein degradation is linked to metabolizable protein. Cross-feeding: Different steps in the pathways of metabolic production of VFA are expressed
Background image of page 1

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

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/30/2008 for the course ADSC 6360 taught by Professor Froetschal during the Spring '08 term at University of Georgia Athens.

Page1 / 3

Quiz 4 - Quiz 4 ADSC 4360/6360 Ruminant Nutrition April 6,...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online