The Better Breeding Blog Breed Better Animals

Having gone over confidence levels, it’s time to apply that and step through some maths! Let’s now calculate confidence levels and the required number of test matings to be statistically confident that a tested animal is not a carrier of a… more »

In The Maths of Matings, Part 1 I promised to write a supplementary post explaining mathematical logs, and here it is! Firstly, what are logs? ‘log’ is short for ‘logarithm’. And ‘logarithm’ can be defined as ‘how many times must one number be multipled… more »

To recap from last week: 1. The formulae for one offspring per mating and with mates from the same group (eg all are known carriers, or all are daughters of the tested sire, or all are randomly selected from a population) are: a. Confidence level for… more »

Below are some tables that summarise the levels of confidence and numbers of matings required to detect a completely recessive allele. These assume that all the mates are of one group, such as all are known carriers, or all are daughters, or all are… more »

The aim of selection is to increase the frequency of desired alleles and decrease the frequency of undesired genes in a population, ideally producing animals that breed true for the genotypes and phenotypes selected for. One influence on the… more »