Fertilisation Flashcards
Fertilisation
When the DNA from two gametes combined
Implantation
A fertilised egg attaches itself to the lining of the uterus
Copulation
The act of mating
Parturition
The foetus is expelled from the body
Gestation
The length of time between conception and birth
Where does fertilisation occur?
It usually occurs in the Fallopian tubes (oviducts) in mammals
Rabbit
6.5 days
Dog
6-10 days
Cat
10-12 days
Pig
12-14 days
Cattle
30 days
Rabbit gestation length
30-32 days
Dog gestation length
58-70 days
Cat gestation length
61-72 days
Pig gestation length
114-115 days
Cow gestation length
279-287 days
The female hormones in parturition include: 4
Progesterone
Oestrogen
Relaxin
Prolactin
4 main hormones in the oestrous cycle
Luitenising hormone (LH)
Follicle Stimulating Hormone (FSH)
Oestrogen
Progesterone
LH
Stimulates mature follicle to produce more oestrogen
FSH
Stimulates one ore more follicles to mature
Oestrogen
Rebuilds the uterine lining and stimulates the release of LH by the pituitary gland
Progesterone
Maintains the lining of the uterus ti be ready for the egg. Inhibits the production of FSH by the pituitary gland
Polyoestrous animals
are fertile more that once a year
Cows, pigs, mice
Seasonally polyoestrous
More than one oestrous cycle per year but only during certain times
Horses, sheep, deer, goats
Monooestrous animals
Only have one cycle per year
Dogs, wolves, foxes, bears
Melatonin
Is a hormone released by the pituitary gland when light levels are high
