Management Of Reproduction

Question 1

How can breeding season be altered to seasonally oestrus animals

Answer 1

Daylight manipulation (to change melatonin)
Ex) increased daylight suppresses melatonin

Question 2

Why may farmers lamb earlier in the year

Answer 2

Selling in the gap in the market so get a better price

Question 3

What are the limitations of natural breeding

Answer 3

Less genetic diversity
Injuries
More expensive to rear a male

Question 4

Why may you manipulate breeding

Answer 4

Desirable genetics
Maximise output of breeding animals
Maximise economic efficiency

Question 5

How may you collect semen

Answer 5

Artificial vagina
Electroejaculation
Manual manipulation

Question 6

What is the function of the hormone prostaglandin

Answer 6

Degrade the corpus luteum

Question 7

How is ovulation induced

Answer 7

Human Chorionic Gonadotrophin (hCG) or GnRH given to induced LH surge

Question 8

When should PGF 2 alpha (prostaglandin) be given

Answer 8

Day 7

Question 9

When is the second dose of GNRH given and why

Answer 9

Day 9
To ensure they have been induced to ovulate