ok, we need pictures on this one as i don't have any carrier cattle, pha or th.
the most cited phenotype for pha "in a positive" way, is upper and fore spring of rib. hopefully this is due to another snp in the gene rather than the one that truncates the protein and is desirable in isolation from PHA. justintime has a couple of cows with great spring of rib there, without pha.
remember, many genes are expressed in different tissues at different stages of development and will not always express in exactly the same quantity.
starting poking around in the th gene and found that a translocation break point has been found in one human within an intron of a gene(i think it's the TH gene in human). introns are splice out, and the exons are used to transcribe and translate into protein. i find this incredible, as crossover point is capable of occuring within a gene on the genomic scale. i'm assuming this is not good. if this were to occur a lot, this would indicate not much selective pressure. i could be wrong, and crossovers occur all over the place with no protection mechanism within genes. some people are studying this big time in corn with very powerful microscopes which look at stained chromosomes and known crossover points. haven't kept up with this research in over 15 years. in some respects, this is sort of a roundabout way of explaining why i think the pha gene is important, and that fullblood carriers may have some variation within the gene that may be beneficial in their PHAF allele and will be lost. it's also why probably why paramount was considered inconsistent, in addition to the PHAC gene causing inconsistency in observed herds trying to use him on a variety of cows. this is the only reason i would use a carrier, and i would find the "perfect" set of say 5 free cows and flush them all to at least 3 carriers i can think of, all full bloods, their names being paramount, universe 15, dalton. telos and xxcc could think of some others under this scenario. telos has not observed any carrier bulls out of i think dalton yet. anyone know of one? i remember thinking about this, but never had the info or the courage to just declare it.