Selection and Breeding
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What s another name for European Cattle?
Bos Taurus
What is another name for Zebu Cattle?
Bos Indicus
What is another name for Swine?
Sus Scrofa
What is another name for Sheep?
Ovis Ares
What is another name for Horse?
Equus Caballus
What is another name for Goat?
Capra Hircus
What is Breeding?
The mating and production of offspring by animals.
What is Selection?
The act of choosing something or someone from a group.
Phenotype is …
the characteristics of an animal that can be seen or measured
Genotype is …
the genetic makeup of an individual
Phenotype =
Genotype + Environment
Genotype =
Phenotype + Environment
Selection:
differentially producing what one wants in the herd and allowing certain mating to occur
What is a Chromosome and where is it located?
chromosomes are located in the nucleus and contain genetic material
What is a Gene?
an active area in the chromosome that codes for a trait
A complex molecule of the chromosome which is the coding mechanism of inheritance is called …
DNA
Gametogenesis is …
the process that the gonads produce cells that become gametes (ova and sperm)
What is Spermatogenesis?
It is the production of sperm (produce 4 sperm)
What is Oogenesis?
It is the production of egg or ova (produce one egg)
Meiosis:
special type of nuclear division that contains one member of each chromosome pair
Give some examples of traits one should select when breeding.
• reproduction • growth (pre weaning, post weaning) • wool • mothering ability • grain (efficiency) • carcass • longevity
When selecting an animal for breeding, you should look for what in the appearance of the animal?
• Genetic abnormalities • Estimate carcass merit • Fit standards for the herd
Production Records include …
• Individuals records • Progeny teseting • Pedigree • Family
Factors affecting Genetic Process includes …
• Selection differential • Heritability • Generation interval • Accuracy of records • Genetic correlation