Swine Repro Flashcards
T/F: Sow ovaries develop multiple follicles
True; they’re litter-bearing
When do pigs rech puberty?
5-8mo
What is the most commonly used method to hasten puberty in gilts?
Boar effect; have a boar around
How long is gestation in a sow?
115d
Sows are ___ (monoestrus/polyestrus) and ___ (seasonal/non-seasonal)
Polyestrus
Non-seasonal
What is the length of estrus cycle?
21d (same as sheep and goats)
How long is estrus in pigs?
36-72h
How long after estrus begins should a sow bred?
24h
Estrus occurs ___ d post-weaning
4-7
What hormones are given to non-cycling gilts? (2)
PMSG
HCG
What happens if pigs are fed less than the recommended 15-20mg/hd/d of Atrenogest?
Cystic ovaries, gone from herd (cannot produce again)
When is the fetus immunocompetent?
70-75d
How long is gestation in sows?
3months, 3 weeks, 3 days
What is the number one test for pregnancy in gilts/sows?
Non-return to estrus in 18-24d
What is stage one of farrowing?
Cervical dilation, 2-12h
What is stage two of farrowing?
Myometrial contractions, fetal expulsion, 2-4h, piglet every 15 min
What is stage three of farrowing?
Fetal membrane expulsion, retained placenta is rare
What drug should not be given in dystocias where there is an obstruction?
Oxytocin
What is given to pigs to induce parturition?
Prostaglandins
How long do pigs lactate for?
3-4wk
What is mastitis-metritis-agalactia complex?
Piglets can’t feed, starve
Sow becomes thin, cannot stand
Due to LPS/Endotoxemia
What is the most common cause of infertility in sows?
Hydrosalpinx
