Bovine Breeding Management

Question 1

Bos ____ attain puberty earlier than Bos ____.

Answer 1

Bos Taurus attain puberty earlier than Bos indicus

Question 2

Heifers calve at ___ years and ___% mature body weight

Answer 2

Heifers calve at 2 years and 85% of mature body weight

Question 3

G………, s………., b….. w….., n………, s…… c…. are all factors of onset of puberty in the cow

Answer 3

Genotype, season, body weight, nutrition, social cues are all factors of onset puberty in cows.

Question 4

How many hours between onset of oestrus to ovulation is there in the cow?

Answer 4

24-30 hrs

Question 5

How many hours does oestrus in the cow last?

Answer 5

4-24 hrs

Question 6

How many days is an oestrus cycle in the cow?

Answer 6

17 - 25 days

Question 7

What is the most obvious sign of oestrus in cows?

Answer 7

Standing to be mounted

Question 8

S_______, r______, l__ ___, v___ ____, m___ ____ are all signs of oestrus in cows

Answer 8

Sniffing, restlessness, lip curling, vulva swelling and mucous discharge are all signs of oestrus in cows

Question 9

How many follicular waves are there per oestrus cycle?

Answer 9

2-3

Question 10

What hormone initiates each follicular wave?

Answer 10

FSH

Question 11

What does GnRH cause the release of?

Answer 11

LH

Question 12

What does LH cause?

Answer 12

Luteinisation/ovulation

Question 13

What hormone is used to shorten the luteal phase?

Answer 13

PGF

Question 14

What is used to initiate an artificial luteal phase?

Answer 14

Progestins