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Flashcards in Lecture 10 Deck (20):
1

What is the main thing that occurs in the pre-ruminant phase?

Reticular or Esophageal groove closure

2

What causes for the esophageal groove to close?

Suckling promotes salivation

As milk passes pharynx, stimulates chemoreceptors with afferent patheways in glossopharyngeal nerve. Receptors react to Na in calves and Cu in lambs

Efferent vagal output leads to groove closure

3

What does saliva contain to help with milk digestion

Esterase, begins digestion of milk lipids

4

When does abomasal secretion occur?

Pre-ruminant phase 

5

What do abomasal secretion contain?

Rennin and HCl

6

What do Rennin and HCl promote?

Hard curd formation by ppt Ca and caseinate

7

What does the hard curd formation allow to enter duodenum?

Remaining fractions, whey proteins (albumins and globulins) enter duodenum rapidly

8

What occurs to hard curd?

SLow digestion - 12-18hrs

Butterfat hydrolyzed by lipase from mammary and esterase from saliva

Ppt caseinate undergoes proteolysis by rennin

9

What is ruminal drinking

Milk goes to rumen

Lactose fermented to lactic acid

Gas formation

Poor milk clot formation

Diarrhea

10

What occurs to salivary gland during transitional phase?

increase in size and amount secreted

11

What does proper rumen development during transitional phase require?

Dry feed

12

What does metabolism become based on during transitional phase?

VFA production, not glucose

13

What is used instead of rennin in weaning/post weaning phase?

Pepsinogen

14

4 benefits of inophores

1. Increase feed efficiency

2. Helps prevent acute lactic acidosis

3. Helps prevent frothy/grain bloat

4. Helps prevent ketosis in lactating dairy cows

15

4 rumen manipulations

1. Ionophores - monensin

2. Buffers

3. Probiotics

4. Protected enzymes

16

Explain probiotics

Addition of selected active microbes whose fermentation pathways are desirable in particular diet

Living organisms administered in dry feed

Need to be fed constantly - not permanently established

 

17

2 examples of probiotics

Yeast - absorb starch molecules, increase feed efficiency

Transfaunation - useful in younger animals

18

Read Carbohydrate engorgement

19

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