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Latest Science on How YOUR dog AGES
#1
http://www.cell.com/current-biology/abst...all%3Dtrue
This is of particular interest in part due to the absolute ignorance shown by people that assume all dogs age the same, as such they shouldnt be bred from under 2 years etc, what a complete load of trash and can only come from an uneducated moron to be honest !
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#2
http://web2.nkk.no/filestore/Artikler_om...et-al2.pdf
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#3
There was a significant association between the age
of the bitch and litter size in our study, which is in line
with other studies [5,10,11,15,19]. However, reports
from other studies still vary somewhat from our results.
Gill reported peak fertility in the bitch to occur at the
age of two years, with a tendency of decreasing mean
litter size thereafter [15]. Andersen [11] and SiertsRoth
[19] found a higher mean litter size in young
bitches and a reduced reproductive performance after
three years of age, in the Beagle and the Hungarian
Shepherd, respectively. Mean litter size in the Drever
decreased after five years of age [5]. In Beagles, the
number of puppies per bitch and per year was in the
optimum range up to five years of age and declined
thereafter [10]. Both the Drever and the Beagle are
medium-sized breeds according to our classification. In
our study, the litter size of medium breeds started
decreasing earlier than five years of age (Fig. 1). The
whelping rate and litter size in a study of larger breeds
tended to be smaller in bitches older than six years [3]
Miniature and small breeds were overrepresented
among the youngest bitches in this study population.
K.S. Borge et al. / Theriogenology 75 (2011) 911–919 917
The same tendency was seen in an Australian study
[15]. This might be because small breeds are expected
to be fully grown and gain sexual maturity earlier than
large breeds [20]. The fact that the mean litter size was
smaller for the youngest bitches of smaller breeds in
our study might indicate that they are not as early
mature as previously believed. Further, it would be
likely to assume that smaller breeds would also be
overrepresented in litters from bitches over seven years
of age due to a shorter expected life span in larger than
smaller breeds [20–22]. However, this is not the case in
our study. But the decrease in litter size at older age is
more pronounced in large breeds than small breeds in
our study. The NKC has strongly advised against
breeding a bitch at her first heat or after the age of eight
years [23]. The low numbers of very young and very
old bitches in our database indicate that most Norwegian
breeders follow these guidelines.
When evaluating whether litter size was influenced
by the number of previous litters of the bitch (or parity),
the confounding factor between litter number and the
age of the bitch must be considered. Initial analysis of
unconditional associations showed a decreasing litter
size with increasing litter number. However, multivariable
analysis revealed that this tendency was mainly
due to increased age of the bitch, and the effect of litter
number was insignificant when tested in the mixed
model. Neither Pearson et al [24] nor Rowlands et al [2]
found a significant effect of parity on litter size. In the
Drever breed, the number of registered pups increased
from the first to the second parity in the Swedish Kennel
Club (SKC) data, and then decreased [5]. The results
of Gill [15] suggested that mean litter size decreased
with increasing litter number, but the
relationship between age and litter number was not
analysed.
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#4
(04-18-2017, 06:42 PM)Versi Wrote: comparateur assurance chien
This is of particular interest in part due to the absolute ignorance shown by people that assume all dogs age the same, as such they shouldnt be bred from under 2 years etc, what a complete load of trash and can only come from an uneducated moron to be honest !


Hello,
Thank you very much for the information!
I understand you perfectly!
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