VERY RECENT Bloat Study Report, in AAHA Journal
as reported to Swissy-L
>From: Sharyl Mayhew <gr8rswis@pop.erols.com>
>Subject: Was, Bloat and dog size/now VERY RECENT Bloat study report
>
>Jamie asked:
>>All the recent (and interesting) bloat talk has got me wondering -- since
>>bloat is generally a Big Dog Phenomenon, anyone know if likelihood of bloat
>>has anything to do with dog size within a bloating breed? In other words,
>>does anyone's personal experience or actual research suggest that one of the
>>more massive Swissies would be more likely to bloat than, say, <WISHFUL
>>THINKING...> my Nico, who is a tiny girl (55 lbs at 11 mo.)? (Maybe this
>>weight discrepancy would partly explain the "males are more likely to bloat
>>than females" tendancy"?)
Good question Jamie-- and well timed:), You must be Psychic:) The "JOURNAL of the
American Animal Hospital Association" September/October 1997 Vol 33 No.5 JUST came in
the mail today (last week) and I will quote here the synopsis with telephonic permission
and for educational purposes only. To read the entire Study Report please see your
veterinarian (All AAHA Certified Animal Hospitals will have a copy) or larger libraries in
your area may carry this publication. I don't know if there is a website for
this, but I will try to look later -- Faster just to type in the short synopsis.
ARTICLE page 379 (INTERNAL MEDICINE)
Predisposition to Gastric Dilatation-Volvulus in Relation to Genetics of Thoracic
Conformation in Irish Setters Robert H. Schaible, PhD; Jan Ziech, BS; Nita W. Glickman,
MS; Diana Schellenberg, MS; Quilong Yi, MD, PhD; Lawreence T. Glickman, VMD, DrPh
A genetic influence on the risk of gastric dilatation-volvulus (GDV) (i.e. bloat) in dogs
has been suspected by some veterinary practitioners and breeders but has not been studied
scientifically. A previous epidemiological study of breed risk patterns suggested that
conformation as well as breed size influence the risk of GDV. A family of Irish setters
with an unusually high frequency of GDV was identified from a sample of 155 dogs in the
Irish Setter Club of America (ISCA) 1994 National Specialty show. The breeder of this
family of Irish Setters helped obtain thoracic measurements with the goal of identifying a
possible genetic basis for familial GDV.
Thoracic depth/width ratios (TDWRs) were calculated from measurements of the parents
(i.e., common dam and two sires) and puppies in two litters. The TDWRs of the parents,
distribution of TDWRs in the litters, and comparisons with earlier population studies
suggest that an incompletely dominant major gene and a background of minor genes and
environmental factors are responsible for the TDWR. A history of GDV was correlated with
high TDWRs in this family as it was reported previously for Irish Setters and certain
other breeds. The findings of this study support earlier evidence that 1) breeds with
higher TDWRs are at greater risk of developing GDV than comparably sized breeds with lower
average TDWRs, and 2) individual dogs within a breed that have higher TDWRs are at greater
risk of GDV compared to dogs of the same breed that have lower TDWRs. It may be possible
to reduce the incidence of GDV by genetic manipulation (i.e., the selective breeding of
dogs with lower TDWRs).
End Synopsis
Jamie what I get out of this study is that it is not the overall weight so much as how
wide and deep the chest cavity is and of course the "ratio" between the two
measurements. I really wish our breed could have been involved in this study from the
beginning like so many others but thanks to the generous breeders in the other breeds we
all will benefit from the
studies as well. Unlike Irish Setters and Great Danes for example, our breed does not have
the deep deep chest that is relatively narrow, instead our dogs have a pretty deep chest
FCI standard calls for "Depth of chest to height at withers = 1 : 2" and that it
is also "Chest: strong, broad, reaching to the elbows. Chest shaped like a roundish
oval (seen incross
section); ribs neither flat nor barrel-shaped. Forechest well developed, noticeably broad
Belly: belly and flanks barely tucked up". The AKC standard says: "The chest is
deep and broad with slight protruding breast bone. Withers are high and long. Body is full
with a slight tuck-up. Ribs are well sprung." More or less the same description
(grin).
We are lucky in the fact that our breed standard doesn't really describe a dog that is
"built to bloat" so we don't have to rethink the "looks" of our breed
as they may be faced with that decision in some other breeds -- instead we need to
continue to look to the standard(s) (we SHOULD use both the FCI and AKC, and historical
descriptions of the dogs as they should be) as our ideal in the breed as well as follow
the individual dog's pedigrees
and make an effort to consider bloat and family histories of bloat into our breeding
decisions.
AND OF COURSE TO FILL OUT OUR HEALTH QUESTIONAIRES and UPDATE them as our dogs mature and
problems may develop. It is never a shame to have a dog
that has a problem but it is certainly shameful to not disclose and share that information
with other breeders and with buyers.
Sharyl.
Life is not the destination -- it is the journey
Sharyl Mayhew - Precious Dog Training
Precious Greater Swiss Mountain Dogs -- Haymarket, VA
gr8rswis@pop.erols.com