Misc. Flashcards
generation interval of BUFFALOES
M 5 yrs
F 3.5 yrs
generation interval of CATTLE
M 4.5 yrs
F 3 yrs
generation interval of SHEEP & GOAT
M 4 yrs
F 2 yrs
generation interval of POULTRY
M 0.7 yrs
F 0.6 yrs
intensity of selection is decreased by selection for more than one trait and it is equal to __________ for each trait
1/square root N
name two method of MEASUREMENT OF RESPONSE
CONTROL SYSTEM STATISTICAL ANALYSIS(phenotypic & genotypic trend)
name the 3 ways of CONTROL SYSTEM
- unselected(random bred) control population
- two way(bidirectional) selection
- repeat mating
name 4 methods of STATISTICAL ANALYSIS(phenotypic & genotypic trend)
- estimation of phenotypic trend
- estimation of genetic trend
- enviromental trend
- genetic change by direct selection
define CONTROL population
a population whose genetic value remains unchanged over generations
unselected(randome bred) control population system is used in ________ species. WHY?
poultry
because it is easy to maintain control population
formula for rate at which the homozygosity is increased
F=1/8M + 1/8F
it is suggested that control population should contain _____ males & _______ females
25-50 males
50-100 females
two way(bidirectional) selection is not feasible for LARGE LIVESTOCK? why
because the selection for DECREASED PERFORMANCE is not justified
adjustment of AGE EFFECT OF DAMS is done in which method of CONTROL SYSTEM
Repeat mating
repeat mating is more restricted to ______ and ______ species
poultry(for control population too)
pig
advantages of REPEAT mating
- less expensive
- no problem of G x E interaction
- no porblem of POPULATION size
the characters under selection are called
selection objectives
simple method to calculate EXPECTED PRODUCING ABILITY was given by ______ called as_____
Lush
Most Probable Producing Ability(MPPA)
expand EPD
Expected
Predicted
Difference
name the scientist who noticed resistance to diseases among WHITE LEG HORNS
Hutt