the effect of the curative treatment was derived from the blood freshness parameter. During a
healing process wounds with fresh blood (score 4) were anticipated to dry up (dark red blood;
score 3), form a scab (black dried blood; score 2) and eventually recover (no blood, score 1). The
percentage of pigs exhibiting wounds with fresh blood was used as a parameter for the
effectiveness of the curative treatments. For each pen where a curative treatment was applied
(either removing the biter or provision of straw twice daily) the percentage of pigs exhibiting
wounds with fresh blood was calculated on each day over a period of 10 successive days
following treatment. The effect of the curative treatment was analysed using non-parametric
tests. Due to the limited number of pens with a curative treatment (
n
= 20), the possible
interaction between the effects of preventive and curative treatments on the percentage of pigs
with fresh blood on the tail could not be analysed.
First, to examine the possible interaction between curative treatment and time (i.e. day
following treatment), differences in percentage of piglets with fresh bleeding tails per pen
between successive days were calculated. These differences were analysed with a Mann–
Whitney
U
-test, comparing the two curative treatments. Here, a non-significant Mann–Whitney
U
-test result indicates that the percentage of pigs with fresh blood shows similar time-courses for
both curative treatments. Since all Mann–Whitney-tests were non-significant (
P
>
0.05 for all
tests, results not shown), differences between days in the percentage of pigs with bleeding tail
wounds were analysed across curative treatments, using Wilcoxon matched pairs signed rank
J.J. Zonderland et al. / Applied Animal Behaviour Science 110 (2008) 269–281
274
tests. Each successive day following treatment was compared with the day prior to the application
of the curative treatment
the effect of the curative treatment was derived from the blood freshness parameter. During ahealing process wounds with fresh blood (score 4) were anticipated to dry up (dark red blood;score 3), form a scab (black dried blood; score 2) and eventually recover (no blood, score 1). Thepercentage of pigs exhibiting wounds with fresh blood was used as a parameter for theeffectiveness of the curative treatments. For each pen where a curative treatment was applied(either removing the biter or provision of straw twice daily) the percentage of pigs exhibitingwounds with fresh blood was calculated on each day over a period of 10 successive daysfollowing treatment. The effect of the curative treatment was analysed using non-parametrictests. Due to the limited number of pens with a curative treatment (n= 20), the possibleinteraction between the effects of preventive and curative treatments on the percentage of pigswith fresh blood on the tail could not be analysed.First, to examine the possible interaction between curative treatment and time (i.e. dayfollowing treatment), differences in percentage of piglets with fresh bleeding tails per penbetween successive days were calculated. These differences were analysed with a Mann–WhitneyU-test, comparing the two curative treatments. Here, a non-significant Mann–WhitneyU-test result indicates that the percentage of pigs with fresh blood shows similar time-courses forboth curative treatments. Since all Mann–Whitney-tests were non-significant (P>0.05 for alltests, results not shown), differences between days in the percentage of pigs with bleeding tailwounds were analysed across curative treatments, using Wilcoxon matched pairs signed rankJ.J. Zonderland et al. / Applied Animal Behaviour Science 110 (2008) 269–281274tests. Each successive day following treatment was compared with the day prior to the applicationof the curative treatment
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