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N. Batorek 1 , M. Čandek-Potokar 1 , M . Škrlep 1 , M. Bonneau 3

Effect of feed restriction in immunocastrates on performance, carcass and meat quality – a comparison with ad libitum fed boars and surgical castrates. N. Batorek 1 , M. Čandek-Potokar 1 , M . Škrlep 1 , M. Bonneau 3

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N. Batorek 1 , M. Čandek-Potokar 1 , M . Škrlep 1 , M. Bonneau 3

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  1. Effect of feed restriction in immunocastrates on performance, carcass and meat quality – a comparison with ad libitumfed boars and surgical castrates N. Batorek1, M. Čandek-Potokar1, M. Škrlep1, M. Bonneau3 1Agricultural Institute of Slovenia, Hacquetova ulica 17, 1000 Ljubljana, Slovenia 3INRA, 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 andsurgicalcastrates/ • on • performance • carcass traits • meat quality

  3. MATERIALAND METHODS - 1 • 88 pigs - LN×LW×PI • 4 treatment groups • SC, n=22 • EM, n=24 • IC_L, n=21 • IC_R, n=21 • individualhousing • ad libitumfeeding: SC, EM, IC_L, • IC_R restrictedfeedintake (80% of SC)

  4. 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

  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 a b b a b b b a ab b ab

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

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

  8. LEAN MEAT % c bc ab a

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

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

  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. Hvala za pozornost Thank youfor your attention Acknowledgement: study was performed in collaboration with pig producerPanvitad.d. and financially supported by the Slovenian Research Agency (program P4-0072; PhD grant). Rennes Metropole scholarship of Nina Batorek is alsoacknowledged.

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