PMID- 37627462 OWN - NLM STAT- PubMed-not-MEDLINE LR - 20230828 IS - 2076-2615 (Print) IS - 2076-2615 (Electronic) IS - 2076-2615 (Linking) VI - 13 IP - 16 DP - 2023 Aug 19 TI - Chromium Methionine and Ractopamine Supplementation in Summer Diets for Grower-Finisher Pigs Reared under Heat Stress. LID - 10.3390/ani13162671 [doi] LID - 2671 AB - This study aimed to determine the effects of the dietary supplementation of chromium methionine (CrMet) and ractopamine (RAC) on pigs in the growing-finishing stage under heat stress. The parameters evaluated included productive behavior, blood components, carcass characteristics, organ weight, and meat quality. This study was conducted during the summer season in Sonora, Mexico. The treatments included: (1) control diet (CON), a base diet (BD) formulated to satisfy the nutritional requirements of pigs; (2) RAC, BD plus 10 ppm RAC supplemented during the last 34 days of the study; (3) CrMet-S, BD supplemented with 0.8 ppm of Cr from CrMet during the last 34 days; and (4) CrMet-L, BD supplemented with 0.8 ppm of Cr from CrMet for an 81 d period. RAC supplementation improved the productive behavior and main carcass characteristics of the pigs compared with CON. However, RAC and CrMet supplementation during the last 34 days showed similar results in terms of weight gain, carcass quality, blood components, organ weight, and meat quality. The addition of CrMet-S had a moderate (although not significant) increase in productive performance and carcass weight. These findings are encouraging, as they suggest that CrMet may be a potential alternative for growth promotion. However, more research is needed. FAU - Sanchez-Villalba, Esther AU - Sanchez-Villalba E AD - Departamento de Agricultura y Ganaderia, Universidad de Sonora, Carretera a Bahia de Kino Km. 21, Hermosillo 83000, Mexico. FAU - Corral-March, Eileen Aglahe AU - Corral-March EA AD - Centro de Investigacion en Alimentacion y Desarrollo, A.C. (CIAD, A.C.), Carretera a la Victoria Km. 0.6, Hermosillo 83304, Mexico. FAU - Valenzuela-Melendres, Martin AU - Valenzuela-Melendres M AUID- ORCID: 0000-0002-7347-9599 AD - Centro de Investigacion en Alimentacion y Desarrollo, A.C. (CIAD, A.C.), Carretera a la Victoria Km. 0.6, Hermosillo 83304, Mexico. FAU - Zamorano-Garcia, Libertad AU - Zamorano-Garcia L AD - Centro de Investigacion en Alimentacion y Desarrollo, A.C. (CIAD, A.C.), Carretera a la Victoria Km. 0.6, Hermosillo 83304, Mexico. FAU - Celaya-Michel, Hernan AU - Celaya-Michel H AD - Departamento de Agricultura y Ganaderia, Universidad de Sonora, Carretera a Bahia de Kino Km. 21, Hermosillo 83000, Mexico. FAU - Ochoa-Meza, Andres AU - Ochoa-Meza A AUID- ORCID: 0000-0001-9001-9861 AD - Departamento de Agricultura y Ganaderia, Universidad de Sonora, Carretera a Bahia de Kino Km. 21, Hermosillo 83000, Mexico. FAU - Gonzalez-Rios, Humberto AU - Gonzalez-Rios H AUID- ORCID: 0000-0002-7463-778X AD - Centro de Investigacion en Alimentacion y Desarrollo, A.C. (CIAD, A.C.), Carretera a la Victoria Km. 0.6, Hermosillo 83304, Mexico. FAU - Barrera-Silva, Miguel Angel AU - Barrera-Silva MA AD - Departamento de Agricultura y Ganaderia, Universidad de Sonora, Carretera a Bahia de Kino Km. 21, Hermosillo 83000, Mexico. LA - eng PT - Journal Article DEP - 20230819 PL - Switzerland TA - Animals (Basel) JT - Animals : an open access journal from MDPI JID - 101635614 PMC - PMC10451215 OTO - NOTNLM OT - chromium methionine OT - growth promoters OT - heat stress OT - pork production COIS- The authors declare no conflict of interest. EDAT- 2023/08/26 10:43 MHDA- 2023/08/26 10:44 PMCR- 2023/08/19 CRDT- 2023/08/26 01:06 PHST- 2023/07/12 00:00 [received] PHST- 2023/08/07 00:00 [revised] PHST- 2023/08/17 00:00 [accepted] PHST- 2023/08/26 10:44 [medline] PHST- 2023/08/26 10:43 [pubmed] PHST- 2023/08/26 01:06 [entrez] PHST- 2023/08/19 00:00 [pmc-release] AID - ani13162671 [pii] AID - animals-13-02671 [pii] AID - 10.3390/ani13162671 [doi] PST - epublish SO - Animals (Basel). 2023 Aug 19;13(16):2671. doi: 10.3390/ani13162671.