Pregnancy/Parturition Flashcards
what induces parturition
fetal adrenal gland releases cortisol when it gets to big/crowded
what hormones increase during parturition
estrogen
prostaglandin
oxytocin
what hormones decrease during parturition
progesterone
what hormone helps pelvic stretch
relaxin
rice pelvic meter
measure of pelvic opening to see if its big enough to bear calves
what effects birth weight of most animals
BW of sire
what effects birthweight of sheep and goats
nutrition/feeding levels
when does 70% of sheep fetal growth happen
last 50 days of pregnancy(Third trimester)
cattle estrus duration
12 hours
sheep estrus duration
24-36 hours
swine estrus duration
48-54 hours
horse estrus duration
6 days
cattle ovulation time
10-18 after estrus start
sheep ovulation time
18-24 after estrus start
swine ovulation time
30-36 hours after estrus start
horse ovulation time
2 days after estrus start
cattle time between estrus
21 days
sheep time between estrus
17 days
swine time between estrus
21 days
horse time between estrus
21 days
which animal has the shortest estrus duration
cattle
which animal has the longest estrus duration
horse
