Food securers or invasive aliens? Trends and consequences of non-native livestock introgression in developing countries.

Considering the large differences in population sizes among DAD-IS national breed populations, the third data set was simplified by computing the linear regression coefficient of population size over years for each national breed population, then comparing the number of populations with a positive trend (i.e. positive regression coefficient) to the numbers of populations with null or negative trends, according to Regions. 3.

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