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Long-Term Effects of Early Low-Phosphorous Nutritional Conditioning on Broiler Chicken Performance, Bone Mineralization, and Gut Health Under Adequate or Phosphorous-Deficient Diets Tous, Núria Francesch, Maria Tarradas, Joan Badiola, Ignacio Perez de Rozas, Ana Fàbrega-Romans, Emma Ballester Devis, Maria Quintanilla, Raquel Torrallardona, David Producció Animal Benestar Animal Genètica i Millora Animal Nutrició Animal Sanitat Animal 575 619 636 Phosphorous is essential for many metabolic functions and the constitution of bones. Poultry have limited ability to use phosphorous from diets, which is mainly excreted and causes environmental concern. For this reason, diets are commonly supplemented with inorganic phosphorus and phytases. It has been suggested that chickens can adapt to an early nutrient restriction by increasing its efficiency of utilization, an adaptation that has been defined as nutritional conditioning. The aim of this study was to investigate a strategy of phosphorous nutritional conditioning by feeding low phosphorous diets during the first week of life as a strategy to improve the efficiency of phosphorous utilization later in life. To test this, 600 male broiler chickens were fed either a standard (control group) or a phosphorous-deficient diet (conditioned group) during the first week of life. Later in life, the effect of conditioning was tested using standard or P-deficient diets during the finishing phase (21–43 d). Conditioning did not affect overall performance, despite finding evidence for reduced relative phosphorous excretion between days 19 to 21, increased duodenal gene expression for the phosphorous transporter SLC34A2 at day 30 (−6% and +17%, respectively), and tendencies for improved phosphorous digestibility (+7%) and tibia mineralization (+6%) at the end of the trial. It is concluded that phosphorous nutritional conditioning early in life can increase subsequent dietary phosphorous utilization and bone mineralization in poultry, although it may not be able to counteract severe phosphorous deficiencies. Further research is required to assess the extent to which phosphorous supplementation in post-conditioning diets may be reduced with this strategy without compromising performance This research was funded by the European Union’s Seventh Framework Programme for research, technological development and demonstration (ECO-FCE; project no. 311794) info:eu-repo/semantics/publishedVersion 2024-11-09 info:eu-repo/semantics/article Tous, Núria, Maria Francesch, Joan Tarradas, Ignacio Badiola, Ana M. Pérez De Rozas, Emma Fàbrega, Maria Ballester, Raquel Quintanilla, and David Torrallardona. 2024. “Long-Term Effects of Early Low-Phosphorous Nutritional Conditioning on Broiler Chicken Performance, Bone Mineralization, and Gut Health Under Adequate or Phosphorous-Deficient Diets.” Animals 14 (22): 3218. doi: 10.3390/ani14223218 2076-2615 http://hdl.handle.net/20.500.12327/3417 https://doi.org/10.3390/ani14223218 eng Animals EC/FP7/311794/EU/A whole-systems approach to optimising feed efficiency and reducing the ecological footprint of monogastrics/ECO-FCE Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess 15 MDPI