ANSI 3433 Lecture Notes - Lecture 3: Weaning, Phenotype, Birth Weight
Document Summary
The kind of animal that works best in one environment may differ from the optimal animal in a different: how do you breed animals so that their. Trait any observable or measurable characteristics of an individual. Observable = coat color, muscling, leg set, etc. Measurable = weaning wt. , ribeye area, time to run a mile. Phenotype an observed category or measured level of performance for a trait in an individual. Phenotype is not just the appearance, it is any anything that can be observed or measured. As animal breeders we are mainly concerned with genotype the genetic makeup of an individual. The genetic model: p = g + e. Environmental effects the effect that external (nongenetic) factors have on animal performance. Examples of environmental effects: weather, altitude, soil type, quality and quantity of forages, nutrition. With breeding methods, we strive to change the genotypes of our a(cid:374)i(cid:373)als" des(cid:272)e(cid:374)da(cid:374)ts. Favorable changes in genotypes result in improved phenotypes.
