Quiz 5 Flashcards
What is the white breed, originating in France, that was imported into the US during the 70s for its growth and muscling?
Charolis
When a trait has a heritability estimate of 0.25 , how much with factors other than genetics play a role in the expression of the genes for that trait
25% will be from genetics, 75% will will from the environment affects
Why do purebred cattle producers often times utilize inbreeding as part of their breeding and genetics program?
It allows them to produce homozygosity and they will have a better chance of keeping that desirable trait and allows them to be subdivided into families
Explain why for bulls with EPDs you will see some with ACC in the 90s for calving ease yet others have ACCs in the 50s
Depending on how many of births are reported for that bull, the Acc will increase or decrease
What are the 3 industry breeder levels in a typical breeders pyramid for the beef cattle industry?
elite breeders (top)
multipliers
end users
When making culling decisions in a beef herd what would be the two most important common reproductiv reasons for removing a cow from a herd
cow is not bred
cow will have a calf late in the season
What is the name of the now very popular breed in the US that originated in great britian and is characterized by having a white face and a tail switch and reddish brown body
hereford
What is the name of the black colored crossbreed that was developed by crossing a Brahman and angus breeds to eventually substain a 3/8 Brahman/ 5/8 Angus blend? What is a one useful characteristic of this breed for the region pf the country where it is most commonly seen?
Brangus and its ability to have better heat tolerance for the hot months commonly seen in Texas
What breed of cattle currently has the most influence in the beef industry? What is the most significant attribute to this breed?
angus
marbling is greatest attribute
Between a two breed and three breed rotational crossbreeding system, which would give the greatest amount of heterosis
three breed
Many continental European breeds were brought ot the US in the 70s. What was the primary reason for incorporating those various breeds into the base commercial cow herd here in the US?
they were known for heir large frame size so they were brought over here intentionally to increase size
What is the most common explanation for how a genetic disease becomes so prevalent in a breed of livestock
a bull being used for breeding can have a genetic disease, and then once bred to multiple cows resulting in similar genetics between the animals. Genetics can cause diseases to be spread from parents to offspring
What is the name of the red colored crossbred breed that was developed by crossing the Brahman and Shorthorn breeds to eventually sustain a 3/8 Brahman x 5/8 shorthorn blend? Where, specifically, was this breed developed? What is one useful characteristic of this breed for the region of the country where it is most commonly seen?
Santa Gertidis
King Ranch in Texas
it has a high heat tolerance
what is the white breed with dark pigmented points, originating in Italy, that was imported into the US during the 70s for its frame size, growth, and muscling?
Chamara
what is the difference between elite seedstock producers and multiplier breeders in the beef cattle industry
elite seedstock producers are the genetic engineers while the multipliers utilize those genetics from the elite producers to sell to the commercial producers
