Test review 2 Flashcards
Structure definition in livestock:
The true conformational function of an animal.
* Most difficult to select for, detect,
and discuss in livestock evaluation
Why is structure important in livestock?
Structure is important in livestock because it affects profitability
* Compromised longevity
* Decreased feed efficiency
What is cow efficiency and how is it
different than the feedlot?
What is the primary reason cows are
culled?
What is the big difference in selection criteria for breeding gilts vs. market hogs?
Function is #1 priority vs. productivity
* Sound and soft bodied
* Muscle takes a back seat
Judging Breeding Sheep
Describe the term “good bodied”
- Bold/round rib
- Maternal look
- Rear rib and flank depth/set correctly
- Not too chubby – early maturing
- Not too hard
What is an EPD?
- Expected progeny difference
- Provide estimates of the genetic value of an animal as a parent
LEA
Loin Eye Area
BF
Back Fat
NBA
Number Born Alive
WTE
Wein to Oestrous Interval
List production traits:
WDA/Days
BF
LEA
Only actual information:
LBS- Pounds of lean
Feed:Gain
SPI
Only Maternal
MLI
Maternal and terminal
TSI
Terminal
In sheep performance data what should you expect to see?
- DoB
- Type Born/Raised
- EPDs
- DNA information
Sheep EPD’s:
- Maternal milk
- % lamb crop
- 60d Wt.
- 120d Wt.
- Maternal milk and growth
Whats Scrapie?
Disease that attacks the central
nervous system, related to BSE in cattle
RR in scrapie=
Scrapie resistant
QR in scrapie
Scrapie resistant
QQ in scrapie
Susceptible to scrapie
Mating situation; The buck’s Codon 171 is
QR
Mating situation; The ewes Codon 171 is
QR
Spider gene NN=
Dominant, very desirable
NS Spider gene=
Carrier
SS Spider gene=
Has spider legs
Dwarfism Gene FF=
Dominant, desirable
FD Dwarphism gene=
Carrier
DD Dwarphism gene=
Is a dwarph
