Horse General, Cyclwe

Question 1

Horses

Answer 1

Chordata, Mammalia perissodactyla

Wild horses – Equus ferus Boddaert Prewalski horse/Taki – Equus ferus Prewalski Tarpan – Equus ferus ferus
Domestic horse – Equus caballus

Question 2

Evolution of horses

Answer 2

Important forms

Eohippus
Mesohippus
Mio-, mery-, pliohipps Equus

Question 3

Agouti

Answer 3

Distribution of black coloured hair

Question 4

E extension/non-extension

Answer 4

Extension of red pigments, ee –> ability to produce black pigment in the skin, but appears red in the hairs

Question 5

G Grey

Answer 5

exclusion of pigment from hair over time, born dark lightens with age –> progressive greying

Question 6

R Roan

Answer 6

mixing of dark and light hairs
appaloosa

Dun

Question 7

W White

Answer 7

inability to form pigment

WW homozygotres, embryonic lethal

Question 8

C colour

Answer 8

SPOT
S – Spotting (Appaloosa; blanket, marble, leopard, snowflake, spot) P – Piebald/skewbald
O – Ovaro spotted
T – Tobiano

Question 9

Repro traits

Answer 9

Puberty btw 16-18 months
full sexual maturity 2 + years (3-5avg)

uniparous, seasonal polyestrous , frequent miscarriage, twins undesirable (70% placenta)

Breeding season feb - AMrch

Question 10

Cycle

Answer 10

Biphasic luteal, 20-21 days
spontaneous, occurs Dustin last phase of heat 4/5th day
1 (2) eggs
Foal heat - 9th day after foalingf, fertile in 50%

Question 11

Covering

Answer 11

intrauterine deposition with AI, 60-80% conception

Question 12

Gestation

Answer 12

336 days

maintained by accessory CL up to day 120, then placental oestrogen from 4-5th month onwards

Question 13

Fertilization

Answer 13

FT, embryo to uterus in day 4-5

Implant day 40-45

Question 14

Hormones

Answer 14

induction of ov

- hCG, GnRH - induce ovulation

Question 15

AI

Answer 15

embryo transfer, GIFT gamete intrafallopian transfer

egg transfer