Protein retention, growth performance and carcass traits of individually housed immunocastrated male- and female- and surgically castrated male Iberian pigs fed diets of increasing amino acid concentration
| Autor: | Rosa Nieto, A. Haro, P. Palma-Granados, Manuel Lachica, Ignacio Fernández-Fígares, Luis F. Lara, Isabel Seiquer |
|---|---|
| Přispěvatelé: | European Commission |
| Rok vydání: | 2020 |
| Předmět: |
Male
Gonadotropin releasing hormone 040301 veterinary sciences Swine Biology SF1-1100 0403 veterinary science Animal science media_common.cataloged_instance Animals Protein retention European union Fatty pigs Amino Acids Protein deposition media_common 2. Zero hunger Vaccination Body Weight 0402 animal and dairy science 04 agricultural and veterinary sciences 040201 dairy & animal science Animal Feed Animal culture Diet Body Composition Animal Science and Zoology Female Growth efficiency |
| Zdroj: | Animal, Vol 15, Iss 4, Pp 100187-(2021) Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 1751-732X |
| Popis: | Immunocastration (IC, vaccination against gonadotropin releasing hormone (GnRH)) is one alternative to surgical castration (SC) for preventing sexual development and boar taint in male pigs. A temporal increase in performance has been described for IC pigs before the second vaccination against GnRH. The objective of this work was to assess the effects of IC on Iberian male and female pigs (fed diets of increasing CP content) on performance, nitrogen retention (NR) and digestibility, and carcass traits. Fifty-four pure Iberian pigs individually housed were allocated to a 3 × 3 factorial arrangement with three sex groups (IC males, IC females and SC males), three diets (153, 137 and 119 g CP/kg DM; 14 MJ metabolisable energy/kg DM) and six pigs per treatment combination. Pigs were vaccinated at 18 weeks of age (40 kg BW) and seven weeks later (70–80 kg BW) and fed at 0.9 × ad libitum on BW basis. Two digestibility and nitrogen balance assays were performed before and after the second vaccination, respectively. Pigs were slaughtered at 105 kg BW. Before the second vaccination, Iberian IC males showed higher growth rate (g/day), feed efficiency, NR (g/day) and efficiency of NR than the other groups (P < 0.001). The NR and efficiency of NR was 40% greater in IC v. SC males (P < 0.001). After the second vaccination, no differences in performance between sex groups were detected (P > 0.05). Growth rate and feed efficiency were higher in IC males than in the other groups for the whole experimental period (from the first vaccination to slaughter; P < 0.001). After the second vaccination, differences among sex groups in NR and the efficiency of NR disappeared (P > 0.05). NR efficiency was 0.177 on average. No significant effects of dietary CP were detected on performance. The NR was greater in pigs fed the 153 CP diet (17 to 37%; P > 0.05). Lean components of carcass (sirloin, loin and butt lean) were greater in IC males than in the other groups (0.001 < P < 0.05). There were no significant sex group × dietary CP interactions. Iberian IC males grew at higher rate, deposited more protein, and more efficiently, than Iberian SC males before the second vaccination against GnRH. Iberian IC females showed similar growth performance to SC males and intermediate protein deposition efficiency between IC and SC males. Despite the higher growth performance, protein deposition rate, and efficiency of protein deposition of IC males v. SC males, no significant differences in amino acid requirements were detected between them. Funded by European Union's Horizon 2020 research and innovation programme (Grant agreement 634476, project acronym TREASURE). The content of this paper reflects only the author's view, and the European Union Agency is not responsible for any use that may be made of the information it contains. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|