Academic Journal
Ractopamine under dietary protein adjustment improves growth performance and carcass traits of immunocastrated and surgically castrated pigs slaughtered 21 days after vaccination.
| Τίτλος: | Ractopamine under dietary protein adjustment improves growth performance and carcass traits of immunocastrated and surgically castrated pigs slaughtered 21 days after vaccination. |
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| Συγγραφείς: | Araujo DD; Department of Animal Science, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil., Ferreira MA; Department of Animal Science, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil., Rodrigues LA; Prairie Swine Centre, Inc., Saskatoon, Canada., Lopes IMG; Department of Animal Science, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil. idael.matheus@gmail.com., de Lima MD; Department of Animal Science, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil., de Almeida Ramos L; Department of Animal Science, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil., de Freitas Ribeiro RJS; Department of Animal Science, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil., Miranda HAF; Department of Animal Science, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil., de Abreu Teixeira ILR; Department of Animal Science, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil., de Oliveira Silva FC; Agricultural Research Institute of Minas Gerais, Viçosa, Minas Gerais, Brazil., Ferreira WM; Department of Animal Science, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil., de Oliveira Fontes D; Department of Animal Science, Federal University of Minas Gerais (UFMG), Belo Horizonte, Minas Gerais, Brazil. |
| Πηγή: | Tropical animal health and production [Trop Anim Health Prod] 2026 Aug 04; Vol. 58 (7). Date of Electronic Publication: 2026 Aug 04. |
| Τύπος έκδοσης: | Journal Article |
| Γλώσσα: | English |
| Στοιχεία περιοδικού: | Publisher: Springer Country of Publication: United States NLM ID: 1277355 Publication Model: Electronic Cited Medium: Internet ISSN: 1573-7438 (Electronic) Linking ISSN: 00494747 NLM ISO Abbreviation: Trop Anim Health Prod Subsets: MEDLINE |
| Imprint Name(s): | Publication: 2005- : Heidelberg : Springer Original Publication: Edinburgh, Livingstone. |
| Ιατρικοί όροι (MeSH): | Phenethylamines*/administration & dosage , Phenethylamines*/metabolism , Orchiectomy*/veterinary , Orchiectomy*/methods , Dietary Proteins*/administration & dosage , Dietary Proteins*/metabolism , Sus scrofa*/growth & development , Sus scrofa*/physiology , Meat*/analysis , Adrenergic beta-Agonists*/administration & dosage, Dietary Supplements/analysis ; Vaccination/veterinary ; Diet/veterinary ; Body Composition/drug effects ; Animal Feed/analysis ; Gonadotropin-Releasing Hormone/immunology ; Vaccines, Contraceptive/administration & dosage ; Animals ; Male ; Weight Gain ; Random Allocation |
| Περίληψη: | The objective of this study was to evaluate the effects of immunocastration and ractopamine hydrochloride (RAC) supplementation on growth performance and carcass traits of male pigs slaughtered 21 days after the second immunization. Sixty-four pigs (Landrace × Large White, initial body weight 103.05 ± 0.67 kg) were individually tagged and randomly assigned to a 2 × 2 factorial arrangement in a completely randomized design, consisting of two castration methods (immunocastrated vs. surgically castrated) and two dietary RAC levels (0 or 10 ppm). No castration method × RAC interactions were observed for any variable (P > 0.05). Immunocastrated (IM) pigs exhibited 19.5% greater average daily gain (ADG) and 13% lower feed-to-gain ratio (FG) compared with surgically castrated (SC) pigs (P < 0.05). IM pigs also showed reduced backfat thickness across all measurement sites and greater lean meat percentage, whereas SC pigs had higher carcass yield (P < 0.05). Ractopamine supplementation under increased amino acid supply increased ADG by 13.6%, improved hot carcass weight by 3.1%, and reduced FG by 13% (P < 0.05). Overall, immunocastration improved growth performance and carcass leanness, while RAC supplementation increased average daily gain by 13.6%, confirming its additive effect under a shortened 21-day post-immunization interval. Immunization against GnRH combined with RAC feeding represents an effective strategy for producing heavy-weight finishing pigs with improved efficiency. (© 2026. The Author(s).) |
| Competing Interests: | Declarations. Ethical approval: All procedures were approved by the Animal Use Ethics Committee (CEUA) of the of the Agricultural Research Company of Minas Gerais (EPAMIG) under protocol number 03/2020. Conflict of interest: The authors declare no conflicts of interest. |
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| Contributed Indexing: | Keywords: Feed intake; GnRH; Swine; β-adrenergic agonist |
| Substance Nomenclature: | 57370OZ3P1 (ractopamine) 0 (Phenethylamines) 0 (Dietary Proteins) 0 (Adrenergic beta-Agonists) 33515-09-2 (Gonadotropin-Releasing Hormone) 0 (Vaccines, Contraceptive) |
| Entry Date(s): | Date Created: 20260804 Date Completed: 20260804 Latest Revision: 20260813 |
| Update Code: | 20260814 |
| PubMed Central ID: | PMC13437753 |
| DOI: | 10.1007/s11250-026-05271-8 |
| PMID: | 42550353 |
| Βάση Δεδομένων: | MEDLINE |
| ISSN: | 1573-7438 |
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| DOI: | 10.1007/s11250-026-05271-8 |