Zusammenfassung der Ressource
Factors affecting
litter size
- Ovulation rate
- Hormonal stimulation
- Gilt selection
- Boar stimulat
- Flush-feeding
Anmerkungen:
- Flush feeding is over feeding about 10 days before mating and then limiting food.
- Body condition
- Nutrition
- Fertilisation Rate
- Semen quality
- mating technique
- Stockmanship
- Embryo survival
- feeding post mating
- 3.5 body condition score
- Vitamins and minerals
- Stress
- Piglets born
Anmerkungen:
- There are usually 9-12 piglets born, with a mean of 11.5. The range is 3-22+
Does nature play a role in still borns as litter sizes are often 15, 16 but there are only 14 teats.
- Stillborns
- body condition
Anmerkungen:
- Piglets have no brown adipose tissue so they struggle to thermoregulate when born.
By utilising body glucose for heat production the piglets are susceptible to hypoglycaemia and hypothermia.
- At birth,
Protein = 16% of body content
Glucose = 3-3.8%
Fat = 2%
- housing
- nutrition
- Piglets weaned
- pre-wean mortality
- 10-30% (mean 15%)
- milk yield
- nutrition
- apetite
- health status
- supplementary piglet nutrition
- spacing and size of teats
- litters/sow
- wean-mating period
- empty days
Anmerkungen:
- Bottom 1/3 = 53 days
Average = 37 days
Top 1/3 = 26 days
Top 10% = 13 days
- nutrition
- boar effect
Anmerkungen:
- Exposing the gilt/sow to a boar can be used to resync the estrus cycle. Can also mate with a vasectomised male to increase litter size. Aborting the gilt - back in cycle in 96 hours.
- stress
- body condition
- parity
- herd management