Bull

Question 1

Subfertile in unselectrd population

Answer 1

20%

Question 2

Financial loss with poor bulls

Answer 2

Low PR, delayed conception, every 21d open…50lb weaning wt/cow lost…$2000/yr/Subfertile bull

Question 3

Periods in carrier of breeding bull

Answer 3

Selection and purchase
Conditioning and preparation
Breeding season
Nonbreeding season

Question 4

Major Aspects examined

Answer 4

Breed, appearance, temperament

Question 5

Culling criteria

Answer 5

Infertility, physical unsoundness

Question 6

RADG

Answer 6

Residual average daily gain

Ability for post weaning gain in progeny

Question 7

CED v. CEM

Answer 7

Maternal- first calf daughters

Direct- sire’s calves

Question 8

Cow energy value

Answer 8

Savings per cow per year

Question 9

Parts of BSE

Answer 9

Libido and mating capacity, PE, SC, sperm motility, sperm morphology

Question 10

Libido capacity

Answer 10

#matings able to perform in test situation (20-40min)
Should have 2-3services/20min test

Question 11

SC

Answer 11

Mod-high heritable, correlation with puberty age, 1st service, 1st calving. >30cm at 12-15m. >34 at >24m.

Question 12

Min progressive motility

Answer 12

30%

Question 13

Primary abnormalities

Answer 13

Testis (spermatogenesis)

Head and mid piece defectd

Question 14

Secondary abnormalities

Answer 14

Epididymis (maturation and storage)

Tail defects

Question 15

Motility and morphology

Answer 15

> 30% and >70%

Question 16

Reasons to quarantine

Answer 16

Adapt, observe for dz, introduce go new health program,

Question 17

Breeding season

Answer 17

70-90d late spring or fall

Question 18

Normal sperm production.

Answer 18

Several months after puberty

Question 19

Rotation

Answer 19

More mature at beginning of season
Younger used later
Rotate mature with younger at 2wk intervals