Exam 2 - Sheep & Goat Reproduction Flashcards
what is repro cycle for ewe
17d cycle
30h estrus
147d gestation
Placental P4
what is repro cycle for doe
21d cycle
36h estrus
150d gestation
CL dependent prod P4
what do sheep & goats have in common as breeders
Short day breeders
that means can be 5-15 mos of age before puberty (depending when born and when next short days is (Fall)
breed variations
differences in estrus b/w doe & ewe
Doe: characterizes as time from moment doe stands to be mounted until refusal
tail wagging, bleating, restlessness, pacing, vulvar swelling
Ewe: vulvar swelling, anorexia
how long does spermatogenesis take in Ram
50 d or 8 wks
how does repro manipulation work
from standpoint of where doe is in her cycle
Anestrus:
hormone manipulation
light manipulation
melatonin administration
Transitional;
Buck or Ram Effect (best w/ :)
hormone manipulation
cycling:
prostaglandins
hormone manipulation
length of time for CIDR in SR
12-14 d
MGA
Melengesterol Acetate
NOT LABELED for sheep/goats
25m/head/day or 15mg BID x 14 d
prostaglandins
only works during breeding season
2 doses (15mg PGF2a or 100 mg Cloprostenol)
9 days apart - low fertility first heat
what is the signal for MRP (maternal recognition of pregnancy) in sheep/goats
interferon - tau
what is the reason to keep at BCS 2.5-3 throughout pregnancy
prevent pregnancy toxemia
preferred preg dx method
u/s
earliest can u/s for pregnancy
transabdominally = 35d
transrectally = 25d
r/t u/s what can be seen when
vesicle ≈ 18-20d transrectal
fetal heartbeat ≈ 25d
placentomes ≈ 35d
skeletal structures ≈ 60d
when is fetus considered viable in both sheep & goats
approx 140d
stages for parturition
1st stage uterine contractions 2-8 h
2nd stage cervix stretched open; oxytocin→abdominal press 20min-2h
newborn lamb (8-15lbs) stands w/i 30min, suckles w/i 2h
3rd stage placental expulsion w/i 2-4h
when to call it dystocia
>30 min of contractions & failure to deliver fetus
most common cause:
fetal postural abnormalities
multiples trying to exit at same time
what to remember about causes of abortions in SR
most causes are ZOONOTIC!
what is Ringwomb
failure of cervix to completely dialate
relatively common in ewe
considered heritable
Tx: C-section
how long does it take for postpartum uterine involution
30d
7 periparturient dz in SR
pregnancy toxemia
vaginal prolapse
uterine prolapse
RFM
metritis
pyometra - rare
hypocalcemia
as a general rule, these problems are more common in sheep than goats
