26: Dairy population medicine

Question 1

What is peak milk yield?

Answer 1

40L per day

Question 2

How many times maintenance energy is required at peak lactation?

Answer 2

3.8x

Question 3

How many times maintenance protein is required at peak lactation?

Answer 3

6-8x

Question 4

What are the three options for how much concentrate to feed a lactating cow?

Answer 4

The same every day, step feeding (starting high and decreasing) or lead feeding (feeding excess to increase yield)

Question 5

What % body weight can a cow eat per day?

Answer 5

3-5%

Question 6

What is the D value of a diet?

Answer 6

Digestibility

Question 7

How long after calving is peak yield?

Answer 7

4-10 weeks

Question 8

At what rate does yield decline?

Answer 8

2.5% per week

Question 9

What influences milk protein?

Answer 9

Energy intake

Question 10

What influences milk fat?

Answer 10

Fibre intake

Question 11

What should the maximum fat:protein ratio be?

Answer 11

Not above 1:4

Question 12

During what part of lactation is the fat:protein ratio often high?

Answer 12

Early

Question 13

What will happen if the cow is in negative energy balance at service?

Answer 13

Won’t get in calf

Question 14

At what points should you do a metabolic profile?

Answer 14

Early lacation, mid lactation, dry cow

Question 15

What 8 conditions are done in bulk milk suveillance?

Answer 15

BVD ag/ab, IBR, lepto, neospora, Johne’s, fluke, ostertagia, lungworm

Question 16

What are the two types of procedures on an organic farm?

Answer 16

Prohibited e.g. dry cow therapy and restricted e.g. castration

Question 17

What are withdrawal times like on organic farms?

Answer 17

Extended