119669 20230519145541.0 doi 10.3390/ani11041090 sideral 126921 ART-2021-126921 eng Sarmiento-García A. Performance evaluation of two slow-medium growing chicken strains maintained under organic production system during different seasons 2021 Access copy available to the general public Unrestricted A total of 160 1-day-old medium-growing male chicks (Gallus gallus domesticus) were raised for 120 days in a certified organic farming system. A total of two strains were studied (Coloryield, CY; RedBro, RB). Overall, two weather periods were considered based on the outdoor temperature, being S1 colder than S2. In total, 40 chicks per strain were assigned to each period (n = 80). Chickens were fed ad libitum with the same organic feeds. In the first month, chickens were kept indoors and, from day 30, they had access to the pasture. Slaughter live weight (LW), average daily gains, (ADG), the feed conversion ratio (FCR), and mortality rates did not differ between the two strains. LW was (p < 0.05) higher in the S1 and a trend (p = 0.084) was observed for ADG, which was higher in S1. No differences were found for feed intake, FCR, and mortality rates between weather periods. There were no differences for coefficient of variation (CV) between the strains studied, nevertheless, CV for LW in S2 was increased. Differences in the productive performance between these strains raised in organic production systems were slight. However, chickens raised in S1 had a better performance. It would be preferable to raise chickens in these weather conditions whenever possible. © 2021 by the authors. Licensee MDPI, Basel, Switzerland. info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 3.231 2021 VETERINARY SCIENCES 16 / 145 = 0.11 2021 Q1 T1 AGRICULTURE, DAIRY & ANIMAL SCIENCE 13 / 63 = 0.206 2021 Q1 T1 0.61 2021 Veterinary (miscellaneous) 2021 Q1 Animal Science and Zoology 2021 Q1 2.7 2021 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Revilla I. Abecia, J.A. Universidad de Zaragoza (orcid)0000-0003-2827-3054 Palacios C. 2008 700 Universidad de Zaragoza Dpto. Produc.Animal Cienc.Ali. Área Producción Animal 11, 4 (2021), 1090 [13 pp] Animals (Basel) Animals 2076-2615 716698 http://zaguan.unizar.es/record/119669/files/texto_completo.pdf Versión publicada 2794129 http://zaguan.unizar.es/record/119669/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:119669 articulos driver 2023-05-18-15:40:37 ARTICLE