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2017 ; 3
(ä): 18
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Surgical castration with pain relief affects the health and productive
performance of pigs in the suckling period
#MMPMID28879020
Morales J
; Dereu A
; Manso A
; de Frutos L
; Piñeiro C
; Manzanilla EG
; Wuyts N
Porcine Health Manag
2017[]; 3
(ä): 18
PMID28879020
show ga
BACKGROUND: Surgical castration is still practiced in many EU countries to avoid
undesirable aggressive behavior and boar taint in male pigs. However, evidence
shows that castration is painful and has a detrimental influence on pig health.
This study investigated the clinical and productive effects of surgical
castration in the suckling period. A total of 3696 male pigs, 3 to 6 days old,
comprising of 721 litters from two different farms were included in the study.
Within each litter, half of the males were kept as intact males (IM) and half
were surgically castrated (CM). Surgical castration was conducted by a trained
farmer. Average daily gain (ADG), body weight at weaning (BWW), percentage of
pre-weaning mortality (PWM) and antibiotic usage were measured. Pig major acute
phase protein (PigMAP) serum concentrations were analyzed prior to castration,
and on days 1 and 10 after castration. Productive performance data were analyzed
using a linear mixed model. Mortality and percentage of pigs treated with
antibiotics were analyzed using the Fisher's exact test. RESULTS: No overall
differences in BWW and ADG were observed between the two groups. However,
differences were observed when the same effects were analyzed in the 25%
lightest, 50% medium and 25% heaviest pigs at birth. PWM was higher in CM than in
IM groups (6.3% vs 3.6%; p < 0.001), especially in the light (12.2% vs 6.2%;
p = 0.02) and in the medium (5.5% vs 2.7%; p = 0.04) weight groups. In the
heaviest pigs group PWM was not affected by castration, but IM tended to show
higher ADG (p = 0.06) and showed higher BWW (8.0 kg vs 7.8 kg; p = 0.05) than CM.
There were no differences in percentage of pigs treated with antibiotics between
the two groups (5.8% vs 5.8%; p = 0.98) in this study. Furthermore, PigMAP was
increased in CM the day after castration (0.944 mg/ml vs 0.847 mg/ml; p = 0.025),
but there was no difference between CM and IM groups at day 10. CONCLUSIONS:
Surgical castration has a negative impact on production in the suckling period
because it causes an increase in PWM, especially in pigs in the three lower
quartiles for body weight, and negatively affects the BWW in pigs born in the
highest quartile for body weight.