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The structure of longevity and relationships between lifespan, reasons of culling, milk yield for lifespan performance have been determined. A heritability factor of 0.126 was estimated. Changes of the longevity structure during course of 98 years were shown. Additionally, the tendency of lifespan to become shorter and, simultaneously, the increase of milk yield in the cow population were shown
Body weight is one of the most important traits in any genetic improvement program in geese for at least 2 reasons. First, measurements of the trait are very easy. Second, body weight is correlated with a number of other meat performance traits. However, the genetic background of body weight shows considerable complexity. Three genetic models (with direct, maternal genetic and permanent maternal environmental...
In a group of purebred Arab mares the level of inbreeding and its effect on three body conformation traits was determined. Moreover, estimated were heritability coefficients of the traits and their phenotypic,genetic and environmental trends. Considered were conformation records of 706 Arab mares born in the years 1936- 1993. The mean inbreeding level of mares was 0.88%. No considerable effect of...
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