On this page  Screening programmes  Osteochondrosis  Research projects  Archive of blood samples  Web based statistical breeding service

Sustainably Breeding Hovawarts for improved health

Rule #1 The health of the magnificent Hovawart begins with healthy parents producing healthy puppies

Aim at sustainable breeding to improve the physical and mental health of Hovawarts .

With cooperation and agreement about breeding goals better sustainable breeding of healthy hovawarts is easily achievable. The breeding of Hovawarts is already organized both internationally and nationally the guidelines cover genetic health , general restrictions, and the goals for breeding hovawarts.

The management of genetic variation in the Hovawart.

The genetic health of Hovawarts is of concern not only to individual breeders, to breed clubs, kennel clubs, geneticists and veterinarians but importantly to the individual Hovawart owner who may have to live with and manage any illness or disease.

The breed as a whole is relatively free of genetic illness and disorders when compared to other breeds. That is not say that there are no problems. However, from the very start, health in the breeding of the Hovawart has remained in sharp focus, and measures taken to minimize the continuation of any genetic faults.

The thoughtful management of genetic variation is important. The relationship between hovawarts selected for breeding must be considered to avoid increased inbreeding due to selection of close relatives. Some countries limit the maximum number of offspring allowed for a single male, a measure introduced to avoid the over- use of popular sires.

To help prevent the loss of genetic diversity, to minimise recessive defects and to avoid inbreeding problems, out-crossing should always be considered in order to increase the effective population size to and improve health traits.

Genetic evaluation using mixed linear models (often called BLUP) for the prediction of breeding values in dog breeding has been used to a limited extent. The BLUP method makes use of all available information about relatives and simultaneously adjusts for environmental effects. Breeding value prediction is a useful tool for the genetic evaluation of many traits. The use of breeding values for selection could enhance genetic improvement not only for diseases, but also for behavioural and other traits. Read more about  breeding values in dogs.

DNA tests for canine disorders

Advances in the development of DNA tests together with the availability of the canine genome sequence , has made it possible to predict and identify the genetically normal, the carrier and affected animals in respect of a particular disease. The possibility of identifying carriers enables even better management of breeding programmes aimed at decreasing the frequency of a particular disease without an unnecessary reduction in the overall gene pool

Screening programmes

Screening programmes for inherited conditions such as hereditary eye diseases, have been developed and utilised. Hovawarts used for breeding must be free from eye diseases and be judged as "very good" at a few shows too. In the past the primary concern was with hip dysplasia, a severe skeletal abnormality.

The majority of Hovawarts are free from dysplasia and the health programme for Hip Dysplasia (HD) requires that the hip score of both the sire and the dam should be known and be free of HD for breeding purposes, they must be scored with a result of ideally HD-A (possibly B). Using a standard x-ray and following the guidelines of the Federation Cynologique International (FCI) national panels of veterinary radiologists grade the hips subjectively. Inevitably there are variations between countries and panelists, and coupled with the fact that results are affected by environmental factors such as the age at screening, makes acceptability for breeding based on hip x-rays alone less than perfect.

Selection against HD and Elbow Dysplasia (ED) based on predicted breeding values has been introduced by some countries, notably Finland and Germany; whilst others are working towards it.

The mental health of the Hovawart.

The character tests and assessments carried out at different ages form the basis for this aspect of the Hovawart. For breeding purposes any Hovawart should generally pass two character tests (one between 9-24 months and another after 22 months) Additionally information from trials, other sports and tests can indicate and validate the mental health of individual hovawarts. The possession of  Schutzhund  (and other) titles and a BH demonstrate their ability and temperament, it is important that the Hovawart retains his real working ability, and all Hovawart breeders should pay attention to their working features.

The original purpose of Schutzhund for example, was to help determine which dogs should be used for breeding with working ability in mind. It tested the dog's mental stability, endurance, structural build, ability to scent, willingness to work, courage, and “trainability”, highlighting the character of the dog through training, identifying dogs that did or did not have the required character traits. Breeders could then use the insights gained to help determine whether or not to use the dog in producing the next generation.

Some of the current research projects by the Genetics Institute University of Berne

• Degenerative myelopathy - a progressive paralysis starting with the hind limbs

• Coat color dilution (blue, blue markings, silver)

• Liver shunt - Intrahepatic portosystemic shunts (PSS)

• Hypothyroidism - lymphocytic thyroiditis - insufficient production of thyroid hormone by the thyroid gland

• Osteochondrodysplasia - affects the growth of bone and cartilage leading to dwarfism

• Sebaceous adenitis - an autoimmune disease occurring in many dog breeds.

• Click here  To read more about any of these and other diseases the Institute is researching

Osteochondrosis

OCD is a defect in the smooth cartilage surface in one or more of the joints, it can affect the shoulder, the elbow, the hip, the knee, or the stifle. It may result in a piece of cartilage breaking off and floating freely in the joint causing pain; and is best treated surgically to remove the defective cartilage. The risks are related to age, gender, rapid growth, and nutrient (primarily calcium) excesses, although general nutrient excesses have been blamed for OCD lesions.

Thyroid and livershunt

Thyroid problems have occurred in the breed, the functioning of the gland can be tested and dogs suffering from the disorder should not be used for mating. Genetic research is being conducted into thyroid disorders and also into livershunt, which has recently been seen in some pups. Pups with livershunt do not usually survive. Livershunt is a well documented disorder and quite common in many breeds.

An Internet based statistical breeding service

Information available to anyone through a single web site would be very useful to breeders for genetic evaluation and selection when breeding , and would be a natural development, an adjunct to the work of the breed committees and advisers

Breeding statistics for individual dogs and for the breed as a whole should include the statistical results from health programmes, from the dog's character assessments, from all official competitions, trials and dog shows, as well as pedigree information. Also the statistics for littermates, siblings and offspring should be available and the expected coefficient of inbreeding could be shown for offspring resulting from a planned mating. Statistics can be included about the number of registrations, and of hovawarts that have been bred from with regards to the number of offspring and grandchildren per sire or dam, the litter size, the age at breeding and the average levels of inbreeding by birth year.

Most of this information is available.The official hovawart breed clubs utilize a software program called "Dogbase", in which every Hovawart that is listed has his test results, offspring etc. and standard breeding values recorded. These values, the   Zuchtwerte   are HD, Overbite (overshot jaw), length of coat, type, temperament and prey drive. The values are evaluated during the various tests and include the values of ancestors, siblings and offspring of that particular dog, and give the breeder more detailed information about the "genetic value" of each dog.

However it is not yet fully accessible in a coherent form. All the results should be published on a single web site for anyone to access.

Great importance has always been attached to the health of the Hovawart. The incidence of hip dysplasia has been reduced to a small percentage through decades of careful breeding. Armed with the contemporary benefits of DNA tests and a better understanding of Breeding value prediction for example, I anticipate that all Hovawart Clubs and breeders will continue to aim for the exemplary goal of sustainable breeding. Its just one of the things that makes our breed special.