small fluffy ruminants Flashcards
puberty
ram= 6 months ewe= 5-7months
buck=3 months, doe=5-7 (pygmy 2-3)
estrous sheep baaaaaa
17 days, 24-36 hrs baaaaa
estrus goat
21 days (12-36hrs)
ovulation sheep baaaa
24-30hrs from onset
ovulation goat
30-36hrs from onset
optimal breeding time sheep baaaaaaa
end of estrus
optimal breeding time goat
acceptance of buck and 12 hrs after (Twice)
body weight
breeding based on body weight. 60-70% total BW. goal is 3 pregnancies in 2 years (twins better)
breeding
small rums short day breeders. september-january.
syncing the breeding
p4, ram effect, melatonin on pineal gland, lights. to get into cycle, start with mimicing diestrus phase. p4 mimics CL function, starts the diestrus mimic phase. CIDR or soaked sponge with p4.
sheep breeding sync
cidr removed 12-14 days after insertion and injected with eCG. AI 55 hrs later. another option is to breed 50 hrs later, and again 10hrs after that
goat breeding sync
pgf2a and eCG given 9 days after CIDR insertion, removed day 11. AI 44 hrs later. or breed 30 hrs after and again 18 hrs after.
eCG
functions to stimulate follicle stimulation and ovulation
ecg v. p4
to induce estrus- eCG. but if syncing, pgf used and no need for eCG because follicle already developing
AI
progestagen vaginal devices. dont use with ram effect and melatonin because doesnt make sync.
melatonin
advances breeding season by 4 weeks
breeding management
Progestagen/progesterone impregnated vaginal devices mimics corpus luteum function Prostaglandin (PGF-2alpha) tightens estrus eCG (PMSG) injection is optional enhancing prolificacy
female anatomy
cervical rings. ewe tortuous, doe aligned.
natural breeding
sheep need to be together for 27 days. goats for 32 days
AI methods
different amounts of sperm. vaginal the most, laparascpoic the least. 400 mil, cervial 200 mil lap 20 mil
indirect pregnancy diagnostics
no return to estrus or low p4 levels. doe is CL dependent, ewe has a luteo placental shift at 50 days
ultrasound
transrectal at 17-60 days. trasnabdominal at 26 days to term. can detect cotyledons after 30 days. most accurate and commonly used dx tool. difficult to count feti after 90 days. radioogy best after 90 days can count feti 50 days after AI. ballottement after 100 days
biomarkers
bioPRYN preg B specific protein >30 days, estrone sulfate, >50d, placental lactogene >60d`
ewe gestation length
148 days and CL dependent until 55-6d. then placenta. induce parturition by glucocorticoids- mimics natural effects of parturition. pgf2a wont be effective because of placental progestagens
