VLS_GUY said:
Grassfarmer,
You are correct to assume a purebred from any coherent breeding program will be less heterzygous than a cross bred. It takes many generations to achieve a high level of homozygousity in order for artificial selection for uniform type to make itself felt. In animals with short generation times like poultry or mice homozygousity is much easier to achieve because the generation turn over much more quickly. Also animals that reproduce at a more rapid rate like chickens or turkeys can have much more selection pressure put on their population since fewer animals must be kept back to maintain the population size. The population size is vital to maintain or eventually you won't have any animals to select from.
In animals with a low reproduction rate and long intervals between generations like cattle keeping the numbers in the population up so you will have animals to create genetic progress is vital. You need heterozygousity in purebred breeds to keep the population producing animals to select from. Note that I did not say maximize the heterozygousity in seed stock herds. Instead managing heterozygosity is the practical alternative. That means using different breeds in the maternal and terminal parts of the breeding program.
The Luing likely has good levels of hetereozygosity combined with selection in a tough environment for maternal traits. The breed has not had the decades of selection to eliminate the heterozygosity-yet. This has made for a unique little cow that should have a place in North America.
By the way have you seen a Highland Saler cross? From the point of view of growth improvement and uniformity in the calf crop I thought it worked the few I saw in Scotland.
Lastly what do you think of the Genus Bull Benhar Dynamite?
Well this is turning into a very informative thread for me. I'm not entirely convinced the Luing breed will be that much more heterozygous than most in North America today after all the "continental" breeds here all had other blood infused to poll them and turn them black. Simmy, limo, salers, gelbveih to name a few and this was all done since the Luing was already a breed. I won't comment on the infusion of other blood in Angus, Hereford etc as I'm sure you all have your own views on it.
Like the other posters my view and experience of saler cattle is entirely negative. Believe it or not the Luing breed in Scotland had a "breed improvment" program in the 90s using saler :shock: :shock: The resulting stock were generally regarded as some of the worst to ever go through the pedigree sale. Taller, faster, snorty and leaner. The Saler cattle seem to suit the feedlot system better than grain finishing though - if you get them on feed early enough and push them they make impressive carcases. They were horrible on a grass system though - just kept growing frame and were very hard to finish.
As for the Dynamite bull I should probably be diplomatic and say "no comment" those that know me know that's not my style though so here goes :wink: ....
I would not use this bull - in fact I could probably not find any Luing bull in Scotland I would use. In my opinion they have completely lost the plot, and what they have done is a carbon copy of the mainstream Angus breed here. They decided to follow the fashion for bigger cattle without regard to inputs, its all about how many high priced bulls we can sell yet the breed set out to be
a commercial breed devoid of the show ring antics that ruined so many others. Bulls there today are generally 400lbs heavier and in some cases 8 inches taller at the same age than they were in the early 1970s! Now no doubt some of that is more generous feeding but part is genetic too. Like the Angus here they maintain the pretense that this is all a bonus and that the cattle maintain their traits of easy care, low feed inputs, longevity that the breed was based on. BS I say - to quote Kit you can't get something for nothing - there is no free lunch and the truth is this has produced rocketing cow weights, higher feed requirements, poorer fertility, less longevity. I looked through a 200 cow herd there a couple of years ago with a view to picking a couple of good cows 10 years plus to take embryos from - they only had about 12 cows over 10 years old and they were pretty much all scrappers by their own admission - poor udders, feet or just worn out. This was one of the best herds in my view, moderate type maternal cows closely bred by someone like me with an interest in line-breeding. Yet the proud boast of the breed is that the average Luing cow still rears 9 or 10 calves in her lifetime - because back in the day before they decided to make their breed as un-Luing as possible by selecting for size, rate of growth etc they were regularly achieving 10 calves plus as my Luings here do.
The other problem I have with the breed in the homeland has been selection for double muscling - I use the word "selection" generously. :wink: Limo is the shape of cattle that sell in the UK and europe, lean red meat, plenty of bland muscle cuts. Rather like the fashion for black here this has resulted in every breed in the UK selecting for limo looking bulls. That's why I wouldn't use Dynamite - I don't want limo calves :wink: :wink: It should come as no surprise of course that using a lot of "limo type" genetics has led to cattle with more flesh, less milk and higher heads...enough said :wink:
Just in case I haven't turned everyone off the breed yet i'll post a picture of a modern cow on the island of Luing which is posted on the Luing society in Scotland website. All I can say is :shock: :shock:
Go to http://www.luingcattlesociety.co.uk/index.php?page=gallery and click on image 4/6 (the cow and the hot air balloon)
I should add the disclaimer that I have no cows that look like this and my breed objectives are 180 degrees different to those of most breeders in the homeland

NR I'll post some pictures of the few I have in a separate thread later.