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Reducing manure in poultry and pig productions by selection

Inra Prod.Anim., 23 (5), 415-426

S. MIGNON-GRASTEAU¹, M. BOURBLANC ²,³, ⁴, ⁵, B. CARRE ¹, J.-Y. DOURMAD ⁸, ⁹, H. GILBERT ⁶, ⁷, H. JUIN ¹⁰, J. NOBLET ⁸, ⁹, F. PHOCAS ⁶, ⁷

1 INRA, UR83 Recherches Avicoles, F-37380 Nouzilly, France

2 INRA, UMR1273 Mutations des Activités, des Espaces et des Formes d’Organisation dans les Territoires Ruraux, F-63122 Saint-Genès Champanelle, France

3 AgroParisTech, Mutations des Activités, des Espaces et des Formes d’Organisation dans les Territoires Ruraux, F-75231 Paris, France

4 CEMAGREF, Mutations des Activités, des Espaces et des Formes d’Organisation dans les Territoires Ruraux, 24 avenue des Landais, F-63172 Aubière, France

5 VetAgroSup, Mutations des Activités, des Espaces et des Formes d’Organisation dans les Territoires Ruraux, Site de Marmilhat, F-63370 Lempdes, France

6 INRA, UMR1313 Génétique Animale et Biologie Intégrative, F-78352 Jouy-en-Josas, France

7 AgroParisTech, Génétique Animale et Biologie Intégrative, 16 rue Claude Bernard, F-75231 Paris, France

8 INRA, UMR1079 Systèmes d’Elevage Nutrition Animale et Humaine, F-35590 Saint-Gilles, France

9 Agrocampus Ouest, Systèmes d’Elevage Nutrition Animale et Humaine, F-35000 Rennes, France

10 INRA, UE1206 EASM, Saint-Pierre d’Amilly, F-17700 Surgères, France

Abstract 
Since they are highly concentrated in some areas in France, poultry and pig production are associated to numerous environmental problems, as a consequence of their manure spreading. Beyond the raw quantity of manure, manure composition, especially in nitrogen, phosphorus, and oligo-elements, is a major source of water and soil pollution. Until now, solutions used to reduce manure quantities were either a posteriori treatments of excreta or reducing waste via modifications of the animals’ diets . Selecting for animals naturally producing fewer excreta was on the contrary not considered, except as a sub-product of selection for an improved efficiency of animals. The aim of this review was thus to give some new insight into alternative ways to reduce manure quantities or to improve their quality by genetic selection. In a first step, indirect selection of traits linked to digestion efficiency or metabolism is planned. In a second step, we present results showing that it is possible to directly select on manure characteristics.

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