Bright Raven
Well-known member
WalnutCrest":1d5hthta said:Bright Raven":1d5hthta said:WalnutCrest":1d5hthta said:If you are you measuring diversity in terms of the number of outright alleles? If so, then you're right ... the relationship is linear.
However, if you're measuring the genetic variation within combinations of alleles, then the relationship is exponential.
I hypothesize, at least as it regards cattle breeding and cattle populations, the latter is a more fair representation of reality than the former.
In terms of of genetic material (genes/alleles), the larger the population the greater the diversity. Let's be clear, in a domestic animal where breeding is controlled to the extent possible, the natural order is skewed.
It's skewed only to the extent all people making all breeding decisions are using the same decision tree to make the decisions that are being made.
If you want 1900 - 2200 lb mama cows, you'll make a different decision that the guy down the road who wants 900-1100 lb mama cows. Such is the state of things within the Angus breed...
So, I'd argue that, as a direct result of the diversity of opinions among Angus breeders, the genetic diversity is more likely to be exponentially related to population size of Angus than linearly related.
PS -- The same can be said for nearly all of the larger breed associations (i.e., great diversity among the desired type of cattle), its just more noticeable with Angus than with other breeds due to their prevalence and promotion.
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PPS -- This says nothing of the "what was knowingly hidden in the woodpile" effect of Angus genetics.
I agree. With one highlight. It is not limited to the Angus Breed. It is more popular to pick on the Angus breed because they dominate US markets. The same phenomenon you mention, i.e. one breeder coveting 1200 pound mommas and another coveting 1800 pound mommas, occurs in all breeds with one trait or another. It is not a bad thing. Preserving diversity has value.