CH. 12 Flashcards
Large-Scale Genetic Evaluation
The genetic evaluation of large pops- typically entire breeds
Central Test
A test designed to compare the performance of animals (usually young males) from different herds or flocks for growth rate and feed conversion by feeding them at a central location.
Designed test
A carefully monitored progeny test designed to eliminate sources of bias like nonrandom mating and culling for poor performance.
Field data
Data that are regularly reported by individual breeders to breed associations or g’vt agencies
Sire summary
A list of genetic predictions, accuracy values, and other useful info about sires in a breed
Repeatability
(in dairy publications): accuracy of prediction
Confidence range
A range of values within which we expect- with a given probability, a given degree of confidence- that a true values of interest lies.
Possible change (PC) or standard error of prediction
A measure of accuracy indicating the potential amount of future change in a prediction
Parent EPD
An EPD for an animal with progeny data Parent EPDs typically come with associated accuracy measures
Nonparent EPD
An EPD for an animal w/o progeny data. Nonparent EPDs typically don’t come w/associated accuracy measures
Pedigree Estimate
A genetic prediction based solely on pedigree data
Interim EPD
An updated EPD that is calculated between BLUP analyses and incorporates new info.
Base
(On large-scale genetic evaluation): the level of genetic merit associated w/an EPD of zero
Base Year
(in large-scale genetic evaluation) the year chosen to represent the base. The avg EPD of all animals born in the base yr is zero.
Incomplete Reporting
The reporting of only selected performance records to a breed association or g’vt agency
Connectedness
The degree to which data from different contemporary groups within a pop can be compared as a result of pedigree relationships between animals in different groups.
Genotype by Environment (GxE) interaction
A dependent relationship between genotypes and environments in which the difference in performance between two (or more) genotypes chages from environment to environment
Nucleus Breeding Scheme
A cooperative breeding program in which elite animals in which elite animals are concentrated in a nucleus herd or flock and superior germ plasm is then distributed among cooperating herds or flocks
Natural Service
Natural mating (as opposed to artificial insemination)
CLosed Nucleus Breeding Scheme
A nucleus breeding scheme in which germ plasm flows in only one direction- from the nucleus to cooperating herds or flocks.
Open Nucleus Breeding Scheme
A nucleus breeding scheme in which the flow of germ plasm is bidrectional- from the nucleus to cooperating herds or flocks and from cooperating herds or flocks to the nucleus
Multiple Ovulation and Embryo Transfer (MOET)
Hormonally induced ovulation of multiple eggs followed by transfer of embryos to recipient damns. The term is used in conjunction w/breeding strategies designed to increase the rate of genetic change using embryo transfer,
