Background
Methods
Animal selection criteria
Treatment and insemination
Milk progesterone test
Pregnancy determination and definition of pregnancy rate
Statistical analysis
Results
CIDR-Select Synch | CIDR12 | p-value | |
---|---|---|---|
Number of cows
| 262 | 246 |
0.224
|
Age of cows (years)
| 5 (4/7 | 5 (4/6.5) |
0.627
|
DIM
| 98.5 (71/142) | 100 (75/133) |
0.709
|
Number of AI's
| 0 (0/1) | 0 (0/1) |
0.942
|
Number of cows/farm
| 24 (18/32) | 25 (19/35) |
0.224
|
Yearly milk yield/cow (kg)
| 7500 (6800/8050) | 7300 (6800/8300) |
0.554
|
CIDR-Select Synch | CIDR12 | p-value | |
---|---|---|---|
Indication for CIDR
| 0.677 | ||
Acyclic
| 71.4% | 72% | |
Neg. preg. check
| 22.9% | 24% | |
No AI
| 5.7% | 4% | |
Breed
|
0.364
| ||
Brown Swiss
| 40.9% | 38.2% | |
Holstein Friesian
| 24% | 20.7% | |
Red Holstein & crossbreds
| 35.1% | 41% | |
Studbook
|
0.341
| ||
Yes
| 79.5% | 82.8% | |
No
| 20.5% | 17.2% | |
Type of stall
|
0.542
| ||
Freestall
| 39.5% | 36.9% | |
Tiestall
| 60.5% | 63.1% | |
Pasture
|
0.285
| ||
Yes
| 91.9% | 94.3% | |
No
| 8.1% | 5.7% | |
Farmer's business
|
0.736
| ||
Regular
| 95.7% | 95.1% | |
Sideline
| 4.3% | 4.9% | |
Uterine treatment
|
0.275
| ||
Yes
| 13.4% | 10.2% | |
No
| 86.6% | 89.8% | |
Gynecological treatment
|
0.174
| ||
Yes
| 10.3% | 6.9% | |
No
| 89.7% | 93.1% | |
Insemination
|
0.733
| ||
Blind
| 78.7% | 77.3% | |
Checked
| 21.3% | 22.7% | |
Progesterone value
|
0.223
| ||
< 0.5 ng/ml
| 44.3% | 39.4% | |
0.5-1 ng/ml
| 14.9% | 12.2% | |
> 1 ng/ml
| 40.8% | 48.4% |