N. Batorek1, M. Čandek-Potokar1, M. Škrlep1, M. Bonneau3
1Agricultural
3INRA, UMR
Institute of Slovenia, Hacquetova ulica 17, 1000 Ljubljana, Slovenia
1079 SENAH, 35590 Saint Gilles, France; Agrocampus-Ouest, UMR 1079 SENAH, 35042
Rennes, France
AIM OF THE STUDY
Effect of restricted feed intake (after V2) in immunocastrates
/comparison to ad libitum fed boars and surgical castrates/
on
• performance
• carcass traits
• meat quality
MATERIAL AND METHODS - 1
• 88 pigs LN×LW×PI
• 4 treatment groups
•
•
•
•
SC, n=22
EM, n=24
IC_L, n=21
IC_R, n=21
• individual housing
• ad libitum feeding: SC, EM, IC_L,
• IC_R restricted feed intake (80% of SC)
MATERIAL
AND METHODS - 2
Traits of interest:
• DG, FI, FCR
• carcass traits
• meat quality traits
Immunocastration effectivness:
• boar taint compounds (A, S),
• reproductive organs
Ante-mortem stress:
• carcass lesions
REPRODUCTIVE ORGANS &
BOAR TAINT COMPOUNDS
Vaccination was successful (no non-responders)
 size of reproductive organs
 level of boar taint compounds
Androstenone, skatol, μg/g
Reproductive organs, g
600
500
400
300
200
100
0
1.2
1
0.8
EM
0.6
IC-L
IC-R
0.4
a b b
a b b
a b b
0.2
0
SC
a b b b a ab b ab
Androst.
Skatole
Indole
PERFORMANCE
Live weight, kg
Daily gain, g/day
150
1200
100
a ab b ab
a ab ab b
50
1000
800
a a b a
a ab b ab
V2-end
V1-End
600
400
0
V1
EM
V2
IC_R
V1-V2
End
IC_L
SC
EM
Feed intake, kg/day
4.00
3.50
3.00
2.50
2.00
1.50
1.00
a ab ab b
b a c c
a a a b
V1-V2
EM
IC_R
IC_L
IC_L
SC
Feed conversion ratio
a a b b
V2-end
IC_R
V1-End
SC
4.00
3.50
3.00
2.50
2.00
1.50
1.00
b a ab c
a a a b
V1-V2
EM
V2-end
IC_R
b a ab c
V1-End
IC_L
SC
ANTE MORTEM STRESS/AGRESSION
Carcass lesions
Carcass lesions, number
10
8
6
4
2
a
a b
b
0
Teeth
Hoofs
EM
IC_R
IC_L
Strokes
SC
64
62
c
bc
60
ab
58
a
56
EM
IC_R
IC_L
SC
IC fatter than EM, leaner than SC;
IC_R closer to EM, IC_L closer to SC
FAT DEPOTS
Visceral
Subcutaneous
Leaf fat, kg
1.2
1
0.8
0.6
0.4
0.2
0
Backfat, mm
Loin eye fat area, cm2
15
c
a
c
16
12
b
9
a
ab
bc
c
12
6
EM IC_R IC_L SC
14
b
a
ab
ab
EM
IC_R
IC_L
10
EM IC_R IC_L
SC
Intermuscular
b
ab
ab
EM IC_R IC_L
a
SC
Intramuscular
LD IM fat, %
Belly leanness (1-7)
5.5
5
4.5
4
3.5
3
2.5
2
SC
21
18
15
12
9
6
3
Neck IMF, %
2.5
2
b
a
a
1
a
b
1.5
a
ab
ab
0.5
0
EM IC_R IC_L
SC
EM IC_R IC_L SC
• no differences between IC_L and IC_R
• IC intermediate between EM and SC, which
differed significantly.
MEAT
QUALITY
pH24
Minolta L
5.6
52
5.55
50
5.5
b
5.45
48
a
a
a
46
5.4
44
5.35
42
5.3
EM
IC_R
IC_L
SC
b
ab
EM
IC_R
IC_L
SC
Shear force, N
6
4
b
40
EZ drip (48h), %
5
a
220
200
180
b
ab
ab
3
b
160
a
140
ab
ab
IC_R
IC_L
a
120
2
100
EM
IC_R
IC_L
SC
EM
SC
Conclusion
Results of this study suggest some benefits in terms of
performance and carcass quality, when feed restriction is
applied to IC after the active immunisation.
Hvala za pozornost
Thank you for your attention
Acknowledgement: study was performed in collaboration with pig
producer Panvita d.d. and financially supported by the Slovenian
Research Agency (program P4-0072; PhD grant). Rennes Metropole
scholarship of Nina Batorek is also acknowledged.