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Andrew Xerri Australia (Verified User) Posts 210 Dogs 10 / Races 0 11 May 2014 10:52
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Hello just want to know if anyone can shed some light on the "Rasmussen Cross" in breeding and how to identify it? Is it something proven and something you need to have?
Ryan Vanderwert Australia (Verified User) Posts 5958 Dogs 8 / Races 0 11 May 2014 11:19
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The definition of a Rasmussen cross is where a 'prepotent dam' is identified on either side of a pedigree thru different individuals within 3 to 5 generations.
This is an example CLICK HERE if you class Sobbing Sal as a prepotent dam.
btw I think it's next to useless in greyhound breeding, others think not. It's the most basic of breeding theories and imo you need to create far greater intensities in pedigrees than a Razmussen cross.
Dave Lonergan Ireland (Verified User) Posts 3410 Dogs 18 / Races 0 11 May 2014 12:10
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CLICK HERE a Rasmussen cross with a 3x4 of staplers jo as well
Dave Lonergan Ireland (Verified User) Posts 3410 Dogs 18 / Races 0 11 May 2014 13:14
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miceal curran wrote:
Dave Lonergan wrote:
CLICK HERE a Rasmussen cross with a 3x4 of staplers jo as well
Staplers Joe a prepotent dam then !!!
if it suits a thought u could recognize purple when you seer it...the Rasmussen cross...OF SOBBING SAL with a 4x3 of staplers jo as well//Sober up Miceal
Dave Lonergan Ireland (Verified User) Posts 3410 Dogs 18 / Races 0 11 May 2014 13:16
I don't see it James...no crossing of rassmussen bitches but I see a lot of honcho,,, that's what you mean I guess
There is a lot of merit in what Owner-Breeder terms "the Rasmussen factor". This is a theory of "inbreeding to superior female families through different individuals". The inbreeding to qualify must occur in the first five generations and be carried in both sides of the pedigree. This is a theory I find most agreeable and worthy of study.
Leon Rasmussen wrote a series of articles that were reprinted in the Australasian Bloodhorse Review between August 1996 and January 1997. The original articles having been published in the American journal Owner-Breeder between July 1993 and March 1994. These articles are recommended reading. A new book has recently been published and if you do not have access to these articles I recommend you read this publication.
The sire Kalamoun is an example of a Rasmussen factor horse given in one of the articles. There are many other examples of this pattern appearing in successful sires and mares.
A possible reason for this being successful is that it is believed genetic material that sits closely together on the chromosomes is less likely to be separated when recombination of this material takes place. It is possible that certain stallions and mares that appear to be particularly prepotent have in their chromosomes important genetic markers that sit closely together and these are not separated when recombination takes place and dont crossover, remaining fixed on their chromosomes and this has a favourable results. That is, not all genes obey the law of independent assortment. This may explain why the Rasmussen factor or for that matter any other preferred pattern appears successful.
X Factoring the Rasmussen Factor
I prefer and use a variation of the Rasmussen factor. The step I take and that I believe is worthwhile exploring is "inbreeding to superior female families through different individuals SEX LINKED TO THE X CHROMOSOME". If possible I would like to do this through full sisters on the X trail and preferably through a son of one and a daughter of the other. Backline is one horse I have bred that is an example of this type of mating. If this is not possible the next best option is just to get a different strain of the same female family on the X trail. I apply this pattern even though I know that with a son the stallion will not pass on this strain of the X but for still consider this as fitting my preferred pattern. With my pattern all that is necessary is that in theory if a filly results a similar X chromosome can be inherited from both the stallion and mare being mated.
The merit of using different individuals is that it provides genetic variation as each parent has its own unique genetic makeup. I believe Leo Rasmussen has made a valid observation that it is desirable to breed to superior female families through different individuals. It obviously multiples the chances of inheriting the genes that make a particular family successful and at the same time reduces the risk of inheriting genetic defects.
The reason I would extend the Rasmussen factor to include "sex linked to the X chromosome " is based on the premise that if important genes are carried on the X chromosome then this is the only way they can be inherited. It is only through the daughters or son's daughters that this genetic material is transmitted. One other possible advantage sex linking this theory is one could use individuals a lot further back in the pedigree chart. Not in the literal sense as obviously you can only mate the immediate parents.
Please note when I refer to the X trail or X factoring and similar I am not referring to the X Factor theory of large heart inheritance. I attribute nothing specific to the X chromosome and have doubts on the validity of the large heart being a trait that is sex-linked.
Penny Doyle United Kingdom (Verified User) Posts 353 Dogs 8 / Races 0 11 May 2014 16:06
just the first one with SS is a Rasmussen cross .......the second is a 3x3 of hallucinate top and bottom.....and looks good
James Saunders Australia (Verified User) Posts 4644 Dogs 3 / Races 3 11 May 2014 22:18
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if your bitch contains a double of amerigo man and you like a sire that happens to contain his brothers than thats breeding intensively to promises free.Theres certain bitches that will pop up repeatedly in your broodies pedigree and its up too you to disect this info and find the sire that compliments this with his own closeness in breeding albeit in different lines and positions.Certain lines just click with other lines and certain sirelines go better with outcrosses its all there in front of you.
Paul Brophy Ireland (Verified User) Posts 12 Dogs 3 / Races 1 27 Feb 2019 21:45
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Would this potential mating be an example of Rasmussen cross?
Carole Brown Australia (Verified User) Posts 32355 Dogs 185 / Races 2 27 Feb 2019 22:27
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Yes Paul, in the fourth generation to Blonde Returns. If you go back a bit further, Droopy's Laramie has a Ras, cross in the 3rd and 4th generation to Westmead Flight.
Paul Brophy Ireland (Verified User) Posts 12 Dogs 3 / Races 1 27 Feb 2019 22:44
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Thanks Carole. Would you be a fan of Rasmussen crosses in general?
Carole Brown Australia (Verified User) Posts 32355 Dogs 185 / Races 2 27 Feb 2019 22:46
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Yes definitely, Paul, but only to an outstanding bitch/producer.
Tony Digiorgio Australia (Verified User) Posts 1008 Dogs 25 / Races 0 27 Feb 2019 23:15
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Hi Paul,
You may also want to "google" Tesio's method of breeding.
You'll probably need a full bottle of scotch or a case of beer because there is quite a lot to read through...... :-)
Ryan Vanderwert Australia (Verified User) Posts 5958 Dogs 8 / Races 0 28 Feb 2019 01:37
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Carole Brown wrote:
Yes definitely, Paul, but only to an outstanding bitch/producer.
Hi Carole, hope you've been well. Many yrs ago those pre-potent dams used to be Promises Free/Tara Silk,Pitstock Park and Secretly from memory. As Pitstock Park, Secretly and even Tara Silk have drifted back past 6 gens in peds these days, who wld be the current trio or so of pre potent dams in your opinion?
Do you have questions about breeding theories? 
