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Flashcards in Lecture 6 Deck (15):
1

What are ionophores?

Oral antimicrobial that alter cell membrane permeability, selectively killing Gram-positive bacteria

2

4 benefits of using ionophores?

Increase feed efficiency - favors propionate, less methane

Prevent acute lactic acidose 

Prevent frothy/grain bloat

Prevent ketosis in lactating dairy cows

 

3

3 factors detrimental to rumen flora?

Abnormal acidity - grain overload

Poor quality feed - impaction

Starvation

4

2 major types of CHO?

Structural

Non-structural

5

Difference between NDF and ADF?

NDF - Neutral detergent fiber, digestible portion of fibre

ADF- Acid detergent fiber, Least digestible portion

6

What is fibre and what is its main function?

Slowly digested structural material

Essential to form the rumen mat

7

3 non fibre CHO

Pectins

Starch

Sugar

8

Digestibility of non-fibre CHO

Completely digest by microbes

Fermentation much more rapid

9

Straw vs Grain

Straw - High in structural CHO

Grain - Highi in non-structural CHO

10

What are legumes high in?

Crude Protein

11

What are VFAs used for my microbes?

To make

Amino Acids

Fatty acids

12

Affect of high starch diet on VFAs?

Increase total VFA, however, increases proportionaly the amount of propionate

13

Affect of propionate on milk content?

Increase starch in feed, increase propionate. Propionate is glucogenic, increase lactose production which causes for an increase in osmotic drive of milk pulling in water, increase milk production however decrease fat content of milk

14

Carbon structure of VFAs

Butyrate - 4C

Propionate - 3C

Acetate - 2C

15

Absorption Rate of VFAs?

Butyrate > Propionate > Acetate