diary production lec 11+12 Flashcards Preview

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Flashcards in diary production lec 11+12 Deck (23):
1

what is incalf and what is its role in the industry

- in calf
o National program collected data from across Australia
 program to advise farmers of areas of improvement in repro
 not necessarily representative
- fertility focus report
o planned national standard
o repro data from farms sent to in calf, generate a fertility focus report

2

what is submission rate

- Submission rates - % inseminated

3

how long is gestation

285 days

4

how long is uterine involution

40-50 days

5

how long is a cycle in a cow

14-21 dyas

6

how long is there between conception and mating

have 80 days to get in calf

7

how long is the typical VWP

60 days

8

what is in-calf rate

- In-calf rates - % pregnant in a certain period

9

what is conception rate

- Conception rates - % inseminations that lead to a pregnancy

10

what is the conception rate for ai

o > 50% for AI
 AI can achieve higher

11

what is the conception rate in heifers

o heifers 60%
 if they are at target weight

12

what is non return and what is its aim

o Non-return rates aim 60%
 want all the cows that were inseminated to NOT return to heat

13

what are the 7 factors that contribute to poor repro according to fertility focus reports

vwp
heat detection
ai practises
bull management
heifer rearing
BCS
cow health

14

when should heat detection take place

 Observation
• 3 x 30mins in paddock a day

15

what is the general rule for bull:cow ratio

 1 Bull/35-50 Heifers
• +1 for safety

16

what BCS should cows be in?

around 3
 calving heifers
• 4.5 – 5.5 / 8 OR 2.75 – 3.5 / 5
 early lactation
• Cows calving above 5.5/8 (3.5/5) at most risk of ketosis
 late lactation
• 4.5/8 (2.75/5)
 dry period
• Calve at 4.5 – 5.5 / 8 (2.75 – 3.5 / 5)

17

how long should a transition diet last in cows

• transition diet +/- 3 weeks from calving
• reduce risk of acidosis

18

how is the overall repro measured in fertility focus

% herd in calf
 overall repro performance of herd
• 100 day in calf
• 200 day not in calf

19

what drives incalf rate

o drivers of incalf rate
 80 day submission rate
 non return rate
 conception rate

20

what are the key fertility management areas

 VMP
 mature cow submission
 return intervals
 first calver milk production
 AI practises

21

what would drive poor conception rates

o Timing of AI
o Inaccuracy of heat detection
o Poor AI technique
o Poor semen quality
o Poor body condition at calving or XS weight loss after calving
o Reproductive tract disease
- cysts and vibrosis

22

what are the 2 types of cystic ovaries and what do they cause

 Cystic ovaries
• follicular cyst
o produce oestrogen increasing cycling
• luteal cyst
o produce progesterone body thinks pregnant so don’t cycle

23

what is the benefit of improved fertility

- benefit of improved fertility
o increase time in lactation= decreased efficiency of feed used
o fewer cows culled for repro
need calf to get milk