Flashcards in Mating, Pregnancy and Birth Deck (64)
What factors should be considered before breeding animals?
Suitable age- mature skeleton, old enough to assess temperament
No hereditary or infectious disease
One oestrus cycle each breeding season
Define seasonally polyoestrus
Cycles as long as season or until gets pregnant
Cessation of reproductive activity
What is the role of LH?
Stimulates ovulation and development of corpus luteum
When does cyclical activity begin in dogs and when is usually their first season?
6-23 months, 6 months after adult weight and height reached
First oestrus at 12-24 months
How long do canine seasons typically last and what type of seasons do they have?
7 months between each
Seasonally monoestrus with 1-2 breeding seasons a year
What happens in pro-oestrus in dogs and how long does it last?
Increased oestrogen release from follicles causes outward signs of oestrus that attract males but female not receptive
FSH cause egg development in follicles
What are the signs of pro-oestrus in dogs?
Serosanguinous vulval discharge containing blood
What is oestrus in dogs and how long does it last?
Female receptive and displays sexual behaviour and light pink discharge from soft vulva
LH peaks from declining oestrogen causing follicles to rupture and egg to release
Corpus luteum begin to develop
9 days with mating on day 3-5
What happens in metoestrus in dogs?
High levels of progesterone to form placenta and maintain pregnancy
Ends cycle by inhibiting FSH and LH
How long does metoestrus last in dogs?
60 days whether pregnant or not
What hormonal changes take place when birth occurs in dogs?
What is pseudopregnancy?
Prolactin produced developing mammary tissue
Progesterone stays at levels similar to if pregnant as prolactin stimulates production from corpus luteum
How long does anoestrus last in dogs?
What is anoestrus in dogs and what are associated hormones?
No sexual behaviour or interest
Low levels of progesterone
FSH level increases to mature follicles
When do cats have their first oestrus?
At 6-9 months but affected by photoperiod so have oestrus in spring
What type of oestrus cycle do cats have and how do they ovulate?
Seasonally polyoestrous, oestrus every 14-21 days while in season
How long does pro-oestrus last in cat and what is it?
Male attracted to female but female not receptive
LH and FSH high
What is the outwards sign of oestrus in cats?
Bloody discharge but usually cleaned away
How long does oestrus last in cats?
What are the signs of oestrus in cats?
Standing for mating
Rubbing on objects
What happens if cats ovulation isn't stimulated?
Quiet period of 2-14 days before returning to pro-oestrus
What hormonal changes take place in cats when ovulation induced?
LH releases egg
Corpus luteum secretes progesterone, maintained by placenta in pregnancy
What is anoestrus and when does it take place in cats?
Inactive ovaries in winter
What is metoestrus in cats and how long does it last?
Non-fertile mating causes pseudopregnancy as corpus luteum releases progesterone at similar levels to pregnancy
45 days long
What happens after metoestrus in cats?
Either re enter cyclical activity or enter anoestrus
Constriction of female prepuce around engorged penis so it cant be retracted back to the female prepuce
Bitch standing with deviated tail when ready to mate