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Newborn foals.  More common in colts than fillies, particularly if they are overdue.  This may be related to a narrower pelvic inlet.
 
Newborn foals.  More common in colts than fillies, particularly if they are overdue.  This may be related to a narrower pelvic inlet.
This condition is the most common cause of rectal obstruction
+
Male foals appear to be
in foals (White and Lessard 1986). Male foals appear to be
   
more commonly affected than fillies due to the smaller pelvic
 
more commonly affected than fillies due to the smaller pelvic
 
inlet in the colt (Martens 1982).(Pusterla)
 
inlet in the colt (Martens 1982).(Pusterla)
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