Interesting ponderings Ralph! I’d like to step them a little further, if I may

– working along with J Forbis’ thoughts of strains and attributes, in her book Authentic Arabian Horse (I) (I’m eagerly awaiting book II

) after many years of pondering strains, I agree with the suggestions there are no physical limitations to a strain in a generic overview. HOWEVER, yes, I will suggest one can see similarities within strains! As illustrated in J Forbis in Book I, strains can then be more ‘forthcoming’ in their “branches” and consequently “families”. I’d go further and suggest essentially its a huge coincidence that attributes can be associated with strains within the generalization of the Breed as a whole.
Why do I think this?, basically because mho - strains are names as are human surnames / family names. A reflection of such can be found in texts, such as the Abbas Pasha Manuscript (Sherif, Forbis), suggesting strongly strains are used for recognition, enabling a verbalized-recount methodology by which an illiterate race of people, the Bedouin, not necessarily unintelligent, could maintain an asil herd within the confines of the desert and their nomadic, yet somewhat confrontational, culture. Within families we can see similarities or not as the case maybe – genetics rule, strains do not. To utilize a quote from within an article ~ “From the early nineteenth century, European travellers and empire-builders were curious about the many strains of the Asil, or pure, horses. Rosetti, a resident of Syria, Northern Arabia and Egypt for 40 years wrote: "The strains belong to one breed or genus (Arabian) but they differ in points of conformation and individual characteristics and peculiarities of the shape, which they transmit..." (a wicked thought ~ there’s that concept of
variety again!!

)
Genetics and the Arabian Horse by Kathleen Murphy - Bio-chemist and horsewoman, written in 1992, published in Australian Studs and Stallions.
Okay, moving this along my question of Nasiri would be – what does Nasiri infer by “pure in strain” so we are all working on the same concept. Raswan, as do many others, suggests of pure-in-strain as within the parameters of sire and dam. Then there are others who tend to work a little broader, to quote Kathleen Murphy again, she illustrates another concept of pure in strain: “…to breed only to certain lines of the pedigree, the lines, which carry the desired tail-female X chromosome. If each of the dams printed in bold type in fig.1 were the same mare, then the pedigree would show inbreeding for family. By the fourth generation, only these nine lines could have provided the tail-female X chromosome for the filly whose pedigree is represented. Nevertheless, because a female obtains an X chromosome from both her sire and darn, there is no way to trace a strain with total accuracy. For a mare or filly, these are the nine lines, which the breeder should aim to a have as the same strain. In this way, it should be possible after about six generations to have Arabian horses bred relatively pure in the strain along the correct lines”. Then, last but not least

, there is the pure-is-pure ie no other strain what so ever; incest breeding at its maximum with the minimalist chances of survival given the centuries/millenniums the desert horse has existed! To my mind, until the statement “pure-in-strain” is clarified, one could be writing at ‘odds’ with one and another?
The above, Ralph, can somewhat be applied to your broad statement of “If I had to pick one strain that I really, really liked it would be the Dahmans. Only because of their consistently good disposition. The Dahmans make terrific friends. I just love them”. Would it be safe for me to conclude you like attributes shown of a family within a branch of a strain that you have become familiar with at a local level? Then taking this logic, applying it in broadly encompassing terms to the Breed in general and internationally? Please, don’t despair, I’m not having a ‘go’ at you! It’s a logical thought process and one, I feel, the learning process goes through. Strains as names and attributes do tend to go hand-in-hand especially within family groups. Within family groups, this reasoning is plausible; as a generic statement it could be so far from the truth, others could be wondering what your reasoning is. And I apply this reasoning not specifically to your statement persé, but on most attributes associated with strains!
As for Al Duhaym, to utilize J Forbis’ pluralistic term, I do have a special penchant for them and would concur with your thoughts! My own sE, AK (Asil and Blue List eligible) stallion and filly are of this strain in both their sire’s and dam’s pedigrees

And the stud from which these bloodlines originated from has two major components within their sE AK program – Al Duhaym and Al Kuhaylat (Rodanieh). The Arabians and their pedigrees from both stud’s programs are on their respective websites. As a bonus, there are 2 video clips of my stallion on his webpage. Instructions on how to use the links are also there ie to view these clips the latest versions (9 or greater) of Window’s Media Player on a PC and a suitable platform on a OS X for a Mac are necessary.
Perhaps, Nasiri, you would care to take a look, particularly at Talika’s website as there is a history of the families / strains used within this program. The photo album on the website essentially highlights the consistency within the general herd of sE and non-sEl programs running concurrently within the stud of varying strains. Overall, I feel, the photo album highlights above all, regardless of strain, it’s the breeder’s preferences (as that of the Bedouin of old) that are selected and bred on from within their program(s). Included within this website are the results of the latest (as per the last season’s foalings) breeding philosophies illustrating (or not) the changes with the inclusion of an intensely line-bred family of different strain(s)(though there are the odd common ancestor – as in all pedigrees, at one generation or another) and its effect on the non-linebred, linebred and in-bred families within Talika’s program.
If I may take the liberty - an update will also highlight that these rather nice Arabians, representing both the asil and non-asil programs of Talika are doing well in endurance with consistently low heart rates within their team of 4 Arabians including a sE gelding. The latest completion earnt the title of “Queensland State Champion – Lightweight Endurance Horse” along with “Best Conditioned” from the same ride (well done, Sam Marquis, Talika’s rider/trainer) – 160k in not-so-pleasant weather conditions by a mare (Talika Fazahma Bint Himar (1991 grey, non-asil, Strain : Kehaileh Rodanieh, Tail Female : Rodania DB)) who was put to saddle as a 10yo, as you can reckon - only 2 years ago!!

hoping Hansi enjoys this addendum