1. N. Batorek 1, M. Č andek-Potokar 1, M. Škrlep 1, M. Bonneau 3 1 Agricultural Institute of Slovenia, Hacquetova ulica 17, 1000 Ljubljana, Slovenia 3 INRA, UMR 1079 SENAH, 35590 Saint Gilles, France; Agrocampus-Ouest, UMR 1079 SENAH, 35042 Rennes, France

2. 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

3. 88 pigs - LN×LW×PI 4 treatment groups individual housing ad libitum feeding: SC, EM, IC_L, IC_R restricted feed intake (80% of SC) MATERIAL AND METHODS - 1 SC, n=22 EM, n=24 IC_L, n=21 IC_R, n=21

4. 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 MATERIAL AND METHODS - 2

5. REPRODUCTIVE ORGANS & BOAR TAINT COMPOUNDS Vaccination was successful (no non-responders) size of reproductive organs level of boar taint compounds a b b a b b ba ab b ab

6. PERFORMANCE a ab ab b a ab b ab a a a b b a c c a a b b a ab ab b a a b a a ab b ab a a a b b a ab c

7. ANTE MORTEM STRESS/AGRESSION Carcass lesions a a b b

8. a ab bc c

9. IC fatter than EM, leaner than SC; IC_R closer to EM, IC_L closer to SC FAT DEPOTS Visceral Subcutaneous IntermuscularIntramuscular ab cc a ab bc c a b ab a b aaa b a b

10. no differences between IC_L and IC_R IC intermediate between EM and SC, which differed significantly. MEAT QUALITY b aaa a abbb a b a b

11. 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.

12. 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. Hvala za pozornost Thank you for your attention