Betaine and feed restriction as potential mitigation strategies against heat stress in two strains of laying hens.
Autor: | De Baets R; Animal Science Unit, Flanders Research Institute for Agriculture, Fisheries and Food, 9090 Melle, Belgium; Department of Pathobiology, Pharmacology and Zoological Medicine, Faculty of Veterinary Medicine, Ghent University, 9820 Merelbeke, Belgium. Electronic address: renee.debaets@ilvo.vlaanderen.be., Buyse K; Animal Science Unit, Flanders Research Institute for Agriculture, Fisheries and Food, 9090 Melle, Belgium; Department of Veterinary and Biosciences, Faculty of Veterinary Medicine, Ghent University, 9820 Merelbeke, Belgium., Antonissen G; Department of Pathobiology, Pharmacology and Zoological Medicine, Faculty of Veterinary Medicine, Ghent University, 9820 Merelbeke, Belgium., Delezie E; Animal Science Unit, Flanders Research Institute for Agriculture, Fisheries and Food, 9090 Melle, Belgium. |
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Jazyk: | angličtina |
Zdroj: | Poultry science [Poult Sci] 2024 Oct; Vol. 103 (10), pp. 104104. Date of Electronic Publication: 2024 Jul 25. |
DOI: | 10.1016/j.psj.2024.104104 |
Abstrakt: | Climate change is increasingly manifesting in temperate regions. Laying hens are highly sensitive to heat stress and mitigation strategies should be implemented to reduce the negative effects. The goal of this experiment was to evaluate the effects of betaine in drinking water (0.55 g/L) and 4 h feed restriction during peak heat stress on laying performance, egg quality, blood gas parameters, body temperature (Tb), and oxidative stress in 2 different breeds of laying hens. Therefore, 448 ISA Brown hens (25 wk) and 448 Lohmann LSL classic laying hens (26 wk) were housed in 128 cages (7 hens/cage). Thermoneutral (TN) data was collected for 21 d before cyclic heat stress (HS) (21d; 32 ± 2°C; 6 h daily). During HS, hens were divided into 4 treatments: 1) feed restriction (FR), 2) betaine supplementation in drinking water (BET), 3) feed restriction and betaine supplementation in drinking water (FR-BET), or 4) control (CON). The effects were evaluated after 1 wk of HS (acute heat stress; AHS) and 3 wk of HS (chronic heat stress; CHS). Laying rate and egg mass (EM) diminished during CHS but decreased more in white than brown hens (2.78% and 1.94%; -1.57% and -0.81%, respectively; P = 0.004) and remained unaltered by BET or FR. During AHS, average daily feed intake (ADFI) increased compared to TN, but the increase was higher in white than brown hens (6.36% and 2.62%, respectively; P = 0.001). Egg shell quality deteriorated during AHS and CHS, but was most affected in white hens, FR or BET did not impact this. Blood pCO Competing Interests: DISCLOSURES None of the authors has any financial or personal relationships that could inappropriately influence or bias the content of the paper. (Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.) |
Databáze: | MEDLINE |
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