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by vonHoss GSD on 19 May 2009 - 14:05
by matthews3662 on 19 May 2009 - 14:05
x-rays. I heard that the hips look like they have more laxity to them when they are in heat.
I want to know if I should go by that next time.
by Okie Amazon on 19 May 2009 - 15:05
by AhSighEE on 19 May 2009 - 15:05
by tighe on 19 May 2009 - 16:05
Since the 1960’s it has been believed that increased estrogen levels during the female heat cycle will affect hip joint conformation by making them appear falsely lax (looser).
In 1997, researchers at the University of Pennsylvania decided to test this theory and followed 9 bitches through an entire cycle. During the study vaginal cytology, behavioral signs and physical exam findings were used to identify the different stages of the cycle. Blood samples were obtained during each estrus-phase, from which hormone concentrations were measured, specifically oestradiol-17β and progesterone. Hip x-rays were taken using the OFA view (hip-extended view) and the PennHIP radiographs during each phase of the heat cycle.
Results showed that even though the hormone levels fluctuated (as expected) the PennHIP DI (hip laxity) and the OFA-type scores did not change significantly.
In Short: The rise in hormone levels during the female heat cycle does not affect hip laxity as measured by PennHIP. However, hormones released during the birthing process (relaxin) and during lactation (prolactin) however, can increase hip laxity and hip evaluation at this time is therefore not recommended. PennHIP recommends waiting 8 weeks post lactation or 16 weeks post welping, before a PennHIP evaluation.
by SitasMom on 19 May 2009 - 17:05
I wonder if this is true for false pregnancy too?
by mewoodjr on 20 May 2009 - 01:05
Just had an OFA x-ray today.
On the back of the OFA application:
Hormonal Effect - Some female dogs show subluxation when radiographed aroud an estrus cycle which is not apparent when radiographed in anestrus. The OFA recommends radiographing 3-4 weeks before or after a heat period or 3-5 weeks after weaning a litter of pups.
Michael
www.woodhauskennels.com
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