This study proposed a modified procedure, using a small balloon catheter (SB catheter, 45 m
l), for reducing bladder damage in cows. Holstein cows and the following catheters were prepared: smaller balloon catheter (XSB catheter; 30 m
l), SB catheter and standard balloon catheter (NB catheter; 70 m
l, as the commonly used, standard size). In experiment 1, each cow was catheterized. The occurrence of catheter-associated hematuria (greater than 50 RBC/HPF) was lower in the SB catheter group (0.0%,
n=7) than in the NB catheter group (71.4%,
n=7;
P<0.05). In experiment 2, general veterinary parameters, urine pH, body temperature and blood values in cows were not affected before or after insertion of SB catheters (
n=6). The incidence of urinary tract infection (UTI) was 3.0% per catheterized day (
n=22). In experiment 3, feeding profiles, daily excretion of urinary nitrogen (
P<0.05) and rate from nitrogen intake in urine (
P<0.01), were higher with use of the SB catheter (
n=13) than with the use of the vulva urine cup (
n=18), indicating that using the SB catheter can provide accurate nutritional data. From this study, we concluded that when using an SB catheter, the following results occur; reduction in bladder damage without any veterinary risks and accuracy in regard to feeding parameters, suggesting this modified procedure using an SB catheter is a useful means of daily urine collection.
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