Dairy Cow Flashcards
1
Q
Gestation Length
A
283 days (≈9 months)
2
Q
Adult weight
A
500kg
3
Q
Litter size/birth weight
A
1 calf/year
30-35kg
4
Q
Cycle length
First Oestrus
A
21 days
2-28hrs oestrus
5
Q
Chance of conception per cycle
A
50%
6
Q
Post-partum oestrus
A
30-60 days
7
Q
Return to oestrus after
A
25-35 days
8
Q
Seasonal breeders?
A
NO
9
Q
Heat detection
A
Ruffled tail hair
Tail paint
Mounting
AI: visual observation of mounting or detection aids (Kamars)
After AI bulls are joined
10
Q
Pregnancy detection
A
U/S
Rectal palpation
11
Q
Joining
A
Seasonal: October
Split: sping/autumn
year round: 3 months post-calving
12
Q
Age of mating
A
15 months (first calving at 2yo)
Most productive at 2-5 yo
13
Q
Mating weight
A
300kg Jersey
350kg Fresian
14
Q
A
