repro quiz Flashcards
what are the goals of reproduction
1 calf/cow/year
manage herds
why is controlled breeding useful
culling, selecting, care at calving, herd health, and nutrition is easier to manage
when should heifers be bred
1 month before cows
what are heifer development goals
use as replacements
calve at 2 y/o
deliver a live calf and rebreed quickly
what traits are heifers picked for
structural soundness
oldest and heaviest
frame score
disposition
when do heifers hit puberty
12-13 months or at 65% of total body weight
what are ionophores
reduces the age of puberty
antibiotic that shifts from production of acetate to propinate
when do bulls hit puberty
9-12 months
scrotal circumference of 26cm
what do bse consist of
physical exam
scrotal circumference
semen evaluation
veneral testing
libido test
when are most calves lost
within 72 hours after calving
some cattle won’t take to the pregnancy
why may a cow fail to get pregnant
freemartin
abnormalities
injury
anestrus
cystic ovaries
irregular cycles
what are the nine bcs
1- emaciated
2- poor
3- thin
4- border line
5- moderate
6- high moderate
7- good
8- fat
9- obese
what are the signs of estrus
standing to be mounted
restlessness
swollen vulva
discharge
what products are used for synchronization
GnRH (ovacyst)
Prostaglandins (lutalyse)
Progestins (CIDR)
what are the grades for embryos
1- excellent
2- fair
3- poor
4- dead
what are the stages of embryos
1- 1-cell, day 1
2- 2-16-cell, day 2-5
3- early morula, day 5-6
4- morula, day 6
5- early blastocyst, day 7
6- blastocyst, day 7-8
7- expanded blastocyst, day 8-9
8- hatched blastocyst, day 9
9- expanding hatched blastocyst, day 9-10
