3waycross":8xiv3b9n said:
If high marbling and funnel butt occur together how is that antagonistic.
Understanding some of these genetic occurrances require thinking "outside the box", so to speak. Sometimes the "box" is pretty large, as is the case with comprehending the manifestations of Genetic influences and inheritances. It is the opinion of some geneticists, and I agree with them, that ABSOLUTELY EVERYTHING is determined, or at least strongly influenced, percentage-wise, by Dominant and Recessive allelic pairs. When both pairs are present in the germ plasm, the particular trait or characteristic is Dominant and appears in the germ plasm. When one of any pair of hereditary factors remains in the germ plasm, the trait remains latent, or recessive. The errors in thinking relating to these influences seem to predominate when breeders overlook the fact that because of the millions and millions of sperm which are present at any specific breeding event, even though the
percentage of Dominance vs. Recessive remain the same, the fortuity, or happenstance occurrances, are astronomical! Therefore, it may take thousands of progeny to ascertain the predictable Accuracy of given matings. It may not. It is the same principle of flipping a coin 10 times and the results are
APPROXIMATELY 50% heads - 50% tails. At 100 flips the percentages are closer to 50/50, and at ten thousand flips the percentages are almost exactly 50/50. Therefore - the more progeny (daughters preferably) that a bull has, the higher and more "Accurate" his predictability score demonstrates.
Now, thinking "out of the box" again, High Milk EPD's, (and Low BW EPD's ,which seem to be interrelated) combine to produce higher Maternal characteristics which manifest, Phenotypically, into more
minimal skeletal muscularity - vis-a'-vis lack of depth of Round, narrow shoulders, slab-sidedness or lack of width (thickness), AND - LACK OF HINDQUARTER MUSCULARITY - or to put it another way - - -
FUNNEL BUTTS! But, because of the incredibly high number of genes in mating opportunities that there are, it doesn't breed true 100% of the time,
unless you can produce 10,000 progeny! High Milk EPD - High Marbling % = Funnel Butt. Low Milk EPD - Low IMF = Terminal
type, Muscular, Deep, Thick, Heavy-Quartered Beef Individual - NOT a Funnel Butt!
But NOT always!
Nothing ever works 100% the way you would wish it would!
DOC HARRIS