Date archives: August 23, 2019

The luck of the draw is inherent in the genetics of canine reproduction. There are millions of possible combinations from the non-fixed portion of the approximately 19,000 genes (Ostrander and Wayne 2005) in the canine genome. It seems a daunting task to reliably breed sled dogs that can compete at an elite level, but there are breeding strategies and steps that can be taken to stack the odds in your favor.

Setting goals

One of the biggest mistakes that any sled dog owner can make is to let emotion rule decisions about what dogs to breed in their kennel. You like a certain dog and want to have puppies that will be just like that dog. But is that dog good enough to accomplish your mushing goals? First, you need to know what your goals are. Are you trying to win the Iditarod?

The Open North American? Skijor races? Do you want to perpetuate your trapping, touring, or recreational team? The dogs that excel in these different venues are genetically different (Huson et al., 2010), as mushers have selected sled dogs that excel in these different formats. Distance dogs have been selected to run forever at speeds around 10 mph and slower. Open-class sprint dogs have the anatomy and physiology to average 20 mph for 20 miles. Champion skijoring dogs are bigger than most distance and open class sprint dogs, are powerful and fast, but mostly do not have the endurance of the former. Recreational, touring, and trapping dogs may be more laid back but are strong and easy travelers.

After establishing the goal of the breeding program, the next question to ask is whether there are dogs in the kennel that are good enough to breed. One of the best pieces of advice I got early in my career was from George Attla who told me that I should only breed dogs that had finished the Fur Rendezvous and Open North American in a top team. These were the races that I was aiming to do well in, but the advice holds for any venue. If you aim to win the Iditarod, you should breed dogs that have finished the race in a top team.

The reason to use dogs from top teams is that they have been proven to have the traits necessary to win. One should also pay attention to whether the dog you want to breed has parents and littermates in top teams. A dog with numerous relatives with shared desired characteristics is more apt to pass those traits to its puppies than a dog from unknown parents and was the only star in the litter. Prefer a top-finishing dog as a parent overusing an unproven littermate. They may not have the desirable traits of their more famous relative.

Hardly any dogs are perfect, though, and even if you are winning races, you may wish to improve certain traits in your dogs. Thus, it is important to know what traits are important for winning your race and could be improved on by picking the right dog to breed. Could your pups use a little more fur? Slightly better feet? A little more speed? Better heat tolerance? The list of essential traits is long, and their importance depends on the race venue They include gait type and efficiency, endurance, attitude, coat thickness, foot conformation and toughness, heat and cold tolerance, mental toughness, size, conformation, appetite, demeanor toward other dogs, personality around people, susceptibility to injury and health.

Harris Dunlap, a successful open-class sprint musher, developed a list of dog traits he considered necessary for winning open-class races and ranked prospective parents based on those characteristics to pick the optimal combination of parents to enhance any non-optimal traits. Another trait that should be considered is the parents’ and their ancestors’ aptitude for leading. Leaders can be made but are usually born. A study I did of dogs running in top Open North American teams (Conn, 1991) showed that leaders bred to other leaders produced nearly three times more leaders than when two top dogs that were not leaders were bred together. Breed leader to leader if you want more leaders.

Importance of male vs female 

What is the importance of the male vs female parent? Generally, both sexes contribute equally to most characteristics, but females contribute all mitochondrial DNA that is the template for cell energy production.

“No go” characteristics

 Have a list of “no go” characteristics that would take a dog out of parenthood contention. Fighters fall into that category for me. Dogs shouldn’t be bred that have known hereditary defects such as wheezing (laryngeal paresis or paralysis), epilepsy, Alaska Husky Encephalopathy (AHE), autoimmune disease, thyroid disease, and progressive retinal atrophy (PRA). There are genetic tests for AHE and PRA that can be used to screen prospective parents. Wheezing is associated with some dog lines with blue eyes, and it is not a good idea to breed two blue-eyed dogs together if there are wheezers in the pedigrees.

Breeding and Pedigrees

Breeding related parents can increase the chances that desirable traits from a famous parent are passed down to offspring.  This is known as inbreeding or linebreeding, depending on the closeness of the common ancestor in the pedigree. While this type of breeding can increase the chances of producing offspring like the common ancestor, it increases the chances that a recessive genetic defect will be revealed because offspring are increasingly homozygous for genes. Within a linebreeding program, breeders will do an outcross breeding every few generations to a dog that is from a top team but that has no common ancestors within 4 or more generations to bring in more genetic variation and desirable traits and potentially introduce hybrid vigor.

To know whether a potential breeding will result in line breeding or outcrossing, a 4-5 generation pedigree is a minimum requirement.  Hopefully, breeders of your prospective parents can provide such a pedigree, but if not, it is often feasible to reconstruct pedigrees if you can find out the names and breeders of the potential bitch or stud.

Pedigree systems

The Web Kennel System (https://www. dogtec.com) , Stamtavla for sledehunder (http://www.stamtavla.no), and Racedogs. org (http://www.racedogs.org/eng/index. php) are online pedigree databases that facilitate searches for parentage.  All of these sources should be consulted, as they do not have the same pedigree information.

Stamtavla and Racedogs are especially strong sources for information about Scandinavian pointer crosses and distance dog pedigrees. Mushing Magazine Superdog articles often give information about the parents of the main dogs in top kennels. J.P Norris started, and I continued The Open North American Pedigrees. These books contain 3-generation pedigree information for dogs running ONAC 1980-2011 (Jeff Conn, jeffconn52@gmail. com). All mushers should consider entering the information; it can only help the sport of mushing by increasing successful breeding.

Tips for choosing breeding parents for racing (Playing the Odds)

  • Know what your goals are
  • Don’t let emotion rule your decision
  • Know the traits and capabilities you desire
  • Choose dogs from proven top mushers (consistently win or finishes in the top of the biggest races in your category)
  • Choose dogs that have run the race you want to win or similar races and has finished the whole race on a top team
  • Choose leaders to produce leaders
  • Choose proven dogs over unproven littermates or relatives
  • Choose  dogs  with  many  proven  littermates  as  the  odds  of desirable traits being passed to puppies is higher
  • Free dogs likely won’t have the traits to win races

 I’ve mistakenly used a free female who was related to a famous dog but had bad feet. Guess what? The puppies had bad feet, too. They ran great on a hard trail but didn’t enjoy running on softer trails.

Conclusion

The simple truth about genetics is that the offspring tend to share traits of the parents. Thus, if you want to build a top kennel quickly, start with top dogs from your chosen race venue because they will have most, if not all, of the characteristics of racers. Yes, it is hard to find those dogs, and they are expensive, but in the long run, you have money and time. Puppies are costly to raise and feed. If you try to save money by breeding dogs that are not top-notch, you may spend over $1500 per puppy to raise them for two years and then not have the dogs you want.

Many well-known mushers will sell older females that ran in their winning teams. Some will sell a top female bred to a top stud in their yard. Splitting a litter with proven genetics with a top musher is also possible.

References

Conn, J.S. 1991. Analysis of pedigree information on the open class North American Sled Dog race, 1980-1991. Highland Kennel PO Box 127, Ester, AK 99725. 

Huson, H.J., H.G. Parker, J. Runstadler, and E.A.Ostrander. 2010. Genetic dissection of breed composition and performance enhancement in the Alaskan sled dog. BMC Genetics 11: 71Ostrander, E. A., and R. K. Wayne, 2005. The canine genome. Genome Res.15: 1706–1716