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ANSC 4395 Exam 1 | with COMPLETE SOLUTION | 94 Questions with 100% Correct Answers
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ANSC 4395 Exam 1 | with COMPLETE SOLUTION | 94 Questions with 100% Correct Answers
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ANSC 4395 Exam 1 | with COMPLETESOLUTION | 94 Questions with 100% Correct
Answers
What is Animal Breeding - -Scientific field that uses the principles of genetics
to aid in the improvement of livestock.
-What are the 3 classes of cattle? - -British
American
Exotics- usually European
-Who is Robert Bakewell? - -"Father of Animal Breeding"
- Leased out Bulls
-What did Robert Bakewell not hesitate to mate? - -"best to the best" with
little regard to ancestry. Not afraid to inbreed.
-What was one of the first organized breeds of livestock in 1580? - -
Shorthorns
-Who is Gregor Mendel? - -He established basic genetic principles that are
still accepted today.
-What did Gregor Mendel study? - -The genetics of the garden pea.
-Population Genetics - -Branch of genetics which deals with the factors that
affect the genetic structure of populations.
*what % of alleles and genotypes*
-What two guys were involved with population genetics? - -1. Dr. Sewell
Wright
2. Sir Ronald Fisher
-Dr. Wright did research with who? - -USDA and then later at the University
of Chicago
-Worked at the Rothamstead Experiment Station in Great Britain. - -Dr.
Fisher
-Dr. Jay Lush - -"Father of MODERN animal breeding"
*established a formal theoretical framework to the science of animal
breeding*
, -Dr. Jay Lush established what principles? - -The principles of selection, the
use of inbreeding to conserve genes of some individuals, and crossbreeding
systems to take advantage of HYBRID VIGOR.
-During the last 30 or 40 years, the use of what has greatly enhanced the
potential for genetic change? - -Computers/ technology
-Artificial Insemination and embryo transfer have allowed for what? - -Faster
progeny testing and selection has become much more efficient.
-What is the primary goal of animal breeders? - -Identify animals with
desirable genes and increase the frequency of those genes.
*they want a bunch, they're the ones they select to be parents to pass on the
good genes*
-What is the best animal? - --Lab- Show winner or best retriever
-Cattle- cutability/% muscle (limousin) or quality grade (angus)
-Dairy Cattle- most milk or best udder, feet and legs.
**all depends on what they want as "best"**
-In the 50-60s how were cattle bred? - -Short/stubby
-How were cattle bred in the 80s? - -tall, large
-How are cattle bred today? - -Moderate (between)
-How do you breed an animal so offspring will be the best or better than the
parents? - --Selection-want genetic improvement, identify best animals and
breed those.
-Genetic principles
-Animal breeding technologies
-Systems Approach - -More OBJECTIVE means of determining the best
animal.
-Systems Approach requires what? - -A detailed knowledge of importance
and how performance in these traits interact with such factors as the
ENVIORNMENT, MANAGEMENT POLICIES, COSTS, and REVENUES.
-System - -a group of interdependent component parts.
*use when selecting best genetics*
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