Swine 3 Flashcards
When are sows most fertile?
Autumn-winter
When do indigenous pigs farrow?
Spring
How many hrs of light should be maintained in breeding-gestation in attempt to prevent seasonal infertility?
16hrs day light
Optimum temp?
18C
Why is warmer air rqd in stalls?
Inability to escape adverse air flow and or floor moisture
What are your target numbers for
- Weekly breeding group
- Weekly farrowing group
- Weekly weaning group
- Rebred
- 10
- 9
- 9
- 7-8
How many gilts to plan on culling anually?
40%
2 potential sources of replacement gilts?
- Raised on farm
2. Purchased from supplier
Pros and cons of replacement gilts from farm
Pros
- Lower upfront cost
- Eliminate acclimation problems
- Lowers biosecurity risk
Cons.
1. More labor rqd to manage genetics
Pros and cons of replacement gilts from supplier?
Pro
1. Supplier manages genetics
Cons.
- Pay premium to supplier
- Greater external biosecurity risk
Define acclimation?
Controlled exposure to the pathogens present in recipient farm, to develop sufficient immunity without clinical illness
Define quarantine
Isolate gilts in a separate building, 30-60days
Difference between acclimation and quarantine?
Quarantine requires physical displacement - different building
Natural service barns ratio boar:females
1:20
