Test review 2

Question 1

Structure definition in livestock:

Answer 1

The true conformational function of an animal.
* Most difficult to select for, detect,
and discuss in livestock evaluation

Question 2

Why is structure important in livestock?

Answer 2

Structure is important in livestock because it affects profitability
* Compromised longevity
* Decreased feed efficiency

Question 3

What is cow efficiency and how is it
different than the feedlot?

Question 4

What is the primary reason cows are
culled?

Question 5

What is the big difference in selection criteria for breeding gilts vs. market hogs?

Answer 5

Function is #1 priority vs. productivity
* Sound and soft bodied
* Muscle takes a back seat

Question 6

Judging Breeding Sheep
Describe the term “good bodied”

Answer 6

• Bold/round rib
• Maternal look
• Rear rib and flank depth/set correctly
• Not too chubby – early maturing
• Not too hard

Question 7

What is an EPD?

Answer 7

• Expected progeny difference
• Provide estimates of the genetic value of an animal as a parent

Question 8

LEA

Answer 8

Loin Eye Area

Question 9

BF

Answer 9

Back Fat

Question 10

NBA

Answer 10

Number Born Alive

Question 11

WTE

Answer 11

Wein to Oestrous Interval

Question 12

List production traits:

Answer 12

WDA/Days
BF
LEA
Only actual information:
LBS- Pounds of lean
Feed:Gain

Question 13

SPI

Answer 13

Only Maternal

Question 14

MLI

Answer 14

Maternal and terminal

Question 15

TSI

Answer 15

Terminal

Question 16

In sheep performance data what should you expect to see?

Answer 16

• DoB
• Type Born/Raised
• EPDs
• DNA information

Question 17

Sheep EPD’s:

Answer 17

• Maternal milk
• % lamb crop
• 60d Wt.
• 120d Wt.
• Maternal milk and growth

Question 18

Whats Scrapie?

Answer 18

Disease that attacks the central
nervous system, related to BSE in cattle

Question 19

RR in scrapie=

Answer 19

Scrapie resistant

Question 20

QR in scrapie

Answer 20

Scrapie resistant

Question 21

QQ in scrapie

Answer 21

Susceptible to scrapie

Question 22

Mating situation; The buck’s Codon 171 is

Answer 22

QR

Question 23

Mating situation; The ewes Codon 171 is

Answer 23

QR

Question 24

Spider gene NN=

Answer 24

Dominant, very desirable

Question 25

NS Spider gene=

Answer 25

Carrier

Question 26

SS Spider gene=

Answer 26

Has spider legs

Question 27

Dwarfism Gene FF=

Answer 27

Dominant, desirable

Question 28

FD Dwarphism gene=

Answer 28

Carrier

Question 29

DD Dwarphism gene=

Answer 29

Is a dwarph