03497naa a2200325 a 450000100080000000500110000800800410001902200140006002400400007410000180011424501990013226000090033150005910034052018810093165300230281265300160283565300210285165300100287265300140288270000200289670000210291670000180293770000170295570000190297270000160299170000160300770000170302370000180304077301130305810644812024-02-29       2024    bl uuuu     u00u1 u    #d  a0306-45657 a10.1016/j.jtherbio.2024.1037982DOI1 aAZEVEDO, L.A.  aStrategies to alleviate heat stress on performance and physiological parameters in feedlot-finished cattle under heat stress conditions. A systematic review-meta-analysis.h[electronic resource]  c2024  aArticle history: Received 11 September 2023; Received in revised form 23 December 2023; Accepted 16 January 2024; Available online 24 January 2024. -- Correspondence: Peripolli, V.; Curso de Pós-Graduação em Produção e Sanidade Animal (PGPSA), Instituto Federal Catarinense, Campus Araquari, SC, Araquari, Brazil; email:vanessa.peripolli@hotmail.com -- Funding: Vanessa Peripolli was supported by productivity research fellowship from CNPq (grant number 309770/2023-8 ). -- Supplementary data to this article can be found online at https://doi.org/10.1016/j.jtherbio.2024.103798 --  aABSTRACT.- Strategies to alleviate heat stress on live performance - dry matter intake (DMI), average daily gain (ADG), and feed conversion efficiency (FCE) - and on physiological parameters - respiratory rate (RR) and panting score (PS) - of feedlot-finished cattle were evaluated by systematic review-meta-analysis. Using the PICO framework were identified 3813 records, with 31 publications and 6729 cattle being considered in the meta-analysis (MA). The comparison most reported was sun vs. shade (n = 24 publications), followed by shade vs. shade (area per animal and effectivity in reduce solar load) (n = 7 publications) and sun vs. sprinkling (n = 4 publications). Cattle with access to shade with total reduction in solar load improved ADG (p = 0.008) and FCE (p = 0.024), and reduced RR (p < 0.001) compared to unshaded animals. Cattle with access to shade with a height between 3 and 4 m increased ADG (p < 0.001), tended to improve FCE (p = 0.054), and reduced RR (p < 0.001) compared to unshaded animals. An area of shade from 2 to 4 m2/animal increased ADG (p = 0.002), and higher than 4 m2/animal reduced RR (p < 0.001) compared to unshaded animals. Animals that received sprinkling volume below 1 L/animal/min improved ADG (p = 0.008) compared to unshaded animals. Cattle with access to shade with a high area per animal improved DMI (p = 0.023) and ADG (p < 0.001) compared to animals with a low area. In univariate meta-regression, it was observed that the variables significantly (P < 0.05) influencing DMI were THI category; influencing ADG were cattle gender, THI category, and coat color; influencing FCE were cattle age and hemisphere; and influencing RR were country, THI category and climate. Performance and physiological parameters of feedlot-finished cattle under heat stress depend on animal and environmental characteristics. © 2024 Elsevier Ltd  aAverage daily gain  aHeat stress  aRespiratory rate  aShade  aSprinkler1 aCANOZZI, M.E.A.1 aRODHERMEL, J.C.B1 aSCHWEGLER, E.1 aLA MANNA, A.1 aCLARIGET, J.M.1 aBIANCHI, I.1 aMOREIRA, F.1 aOLSSON, D.C.1 aPERIPOLLI, V.  tJournal of Thermal Biology. 2024, Volume 119, Article 103798. https://doi.org/10.1016/j.jtherbio.2024.103798