therio pig infertility

Question 1

the boar

Answer 1

fibroelastic penis, corckscrew shaped penis. caudally oriented testes (upside down. more exposed, heat stress). no ampullae, but has bulbourethral and vesicular gland. have prostrate. bulbo is huge -70% semen volume. gelatinous semen. predominant sex gland. sigmoid flexure.

Question 2

sow

Answer 2

bicornuate uterus, paired ovaries, red corpora lutea, prolonged corpora hemorrhagica, long twisted cervix. cervix has more folds, so teh corckscrew shape goes in and the pressure on the penis from cervix helps.

Question 3

puberty in boar

Answer 3

9 months. crossbred, earlier. testosterone, penile growth, mounting behavior. penile frenulum breaks down, increased daylight is good. deason polyestrus

Question 4

teats

Answer 4

at least 10 functional with 6 on each side. average is 14.

Question 5

semen collection pig

Answer 5

gloved hand method. 150-300ml. 30-60 billion sperm, more than other species. 65% motile, 80% normal morphology, 100k sperm.

Question 6

boar pheremones

Answer 6

5 alpha androsterone. in saliva. helps stimulate estrus in sows, puberty in gilts and mounting behavior in young boars. hypersalivation during coitus.

Question 7

gilt puberty

Answer 7

6-7 months. facilitated by boar effect pheremones. fence line exposure. 240-300lbs. estrus cycle 21 days.

Question 8

estrous of pigs

Answer 8

one follicular wave lasts 17 days. non seasonal, polysetrus, slight decrease in fertility in late summer, heat stress. cycl 21 days. single wave. follicular estradiol causes standing heat 2-3 days. progesteone stops LH. So, will have a recruitment of follicles and selection of dominant follicle, the pre-ovulatory follicle. When corporus luteum is lysed and progesterone is removed, LH happens, GnRH lurge, LH surge, ovulation takes place.

Question 9

ovulation in pigs

Answer 9

ovulate 36-44hrs after osnet of estrus. fllush feeing- increase feed intake just prior to estrus to increase energy and have more ooctyes.

Question 10

CL in pigs

Answer 10

CL functional by day 5-6. not respond to pgf2a before day 12-13. exogenous pgf2a induces parturition. CL dependent pregnancy- continous p4 secretion.

Question 11

back pressure test

Answer 11

confirm standing heat, estrus. main test/sign

Question 12

oocytes

Answer 12

100% fertilized, 20-30% die within first 30 days. uterus limits number of survivable ones (uterine capacity). transuterine migration of embryos. embryos secrete estradiol at 10-11 days

Question 13

estradiol at 10-11 days

Answer 13

maternal recognition of pregnancy. blocks pgf2a release to prevent luteolysis. keeps CL functional throughout entire pregnancy. maintenance of pregnancy- two embryos per horn, 2 fetuses total to keep

Question 14

gestation of pigs

Answer 14

114 days. 333. placentation is diffuse, epitheliochorial.

Question 15

pregnancy in pigs

Answer 15

lack of estrus, rectal palpation or ultrasound.

Question 16

parturition pigs

Answer 16

late afternoon and night 2-5 hours. deliver in 15 minutes intervals. placenta at 4 hours after delivery. dystocia common fetus trapped in cervix. pgf2a to induce parturition via luteolysis. 1-2 days before delivery. then oxytocin if that doesn’t work. wean 21-28 days. adequate nutrition during weaning.

Question 17

lactational anetrus

Answer 17

sow unable to cycle while nursing. uterine involution, estrus 28 days after farrowing. lactation can reduce BCS and hurt estrus timing.