Intro to farm animal repro Flashcards
What is the most useful landmark when palpating repro tract
cervix
What does a follicle secrete
oestradiol- drives oestrus
what does a corpus luteum produce
progesterone
what is corpus luteum
highly vascularised, transient endocrine gland
what do a CL look like on Ultrasound
homogenous medium echogenicity
When does ovulation occur in the cow
12hrs after end of oestrus
If a CL is 20 mm what does this mean
CL is either growing or regressing
How long is the duration of oestrus in the cow
5-18hrs
will ovulate 12hrs after end of oestrus
How long is the oestrus cycle in the cow
21-22 days
How long is the oestrus cycle in the ewe
17 days
How long is oestrus in the ewe
24-36 hrs
ovulate 30-36 hours from begging of oestrus
How long is the oestrus cycle in the sow
21 days
how long is oestrus in the sow
48-72hrs
ovulate 35-45 hours from beggining of oestrus
What is the main oestrus detection method in the sow
back pressure test
Describe the resumption of full ovarian activity after parturition
At parturition, pituitary isrefractory to GnRH, but
FSH secretion initiated due to lack of negative feedback, this leads to emergence of an antral follicular wave
Increasing sensitivity of gonadotropes to GnRH, leading to
Increased FSH-stimulation of oestradiol production
Increased LH pulse frequency
Ovulation, often accompanied by silent oestrus