Exam 2 - Sheep & Goat Reproduction

Question 1

what is repro cycle for ewe

Answer 1

17d cycle

30h estrus

147d gestation

Placental P4

Question 2

what is repro cycle for doe

Answer 2

21d cycle

36h estrus

150d gestation

CL dependent prod P4

Question 3

what do sheep & goats have in common as breeders

Answer 3

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

Question 4

differences in estrus b/w doe & ewe

Answer 4

Doe: characterizes as time from moment doe stands to be mounted until refusal

tail wagging, bleating, restlessness, pacing, vulvar swelling

Ewe: vulvar swelling, anorexia

Question 5

how long does spermatogenesis take in Ram

Answer 5

50 d or 8 wks

Question 6

how does repro manipulation work

Answer 6

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

Question 7

length of time for CIDR in SR

Answer 7

12-14 d

Question 8

MGA

Answer 8

Melengesterol Acetate

NOT LABELED for sheep/goats

25m/head/day or 15mg BID x 14 d

Question 9

prostaglandins

Answer 9

only works during breeding season

2 doses (15mg PGF2a or 100 mg Cloprostenol)

9 days apart - low fertility first heat

Question 10

what is the signal for MRP (maternal recognition of pregnancy) in sheep/goats

Answer 10

interferon - tau

Question 11

what is the reason to keep at BCS 2.5-3 throughout pregnancy

Answer 11

prevent pregnancy toxemia

Question 12

preferred preg dx method

Answer 12

u/s

Question 13

earliest can u/s for pregnancy

Answer 13

transabdominally = 35d

transrectally = 25d

Question 14

r/t u/s what can be seen when

Answer 14

vesicle ≈ 18-20d transrectal

fetal heartbeat ≈ 25d

placentomes ≈ 35d

skeletal structures ≈ 60d

Question 15

when is fetus considered viable in both sheep & goats

Answer 15

approx 140d

Question 16

stages for parturition

Answer 16

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

Question 17

when to call it dystocia

Answer 17

>30 min of contractions & failure to deliver fetus

most common cause:

fetal postural abnormalities

multiples trying to exit at same time

Question 18

what to remember about causes of abortions in SR

Answer 18

most causes are ZOONOTIC!

Question 19

what is Ringwomb

Answer 19

failure of cervix to completely dialate

relatively common in ewe

considered heritable

Tx: C-section

Question 20

how long does it take for postpartum uterine involution

Answer 20

30d

Question 21

7 periparturient dz in SR

Answer 21

pregnancy toxemia

vaginal prolapse

uterine prolapse

RFM

metritis

pyometra - rare

hypocalcemia

as a general rule, these problems are more common in sheep than goats