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Quantification des bénéfices de la baisse de protéine sur les rejets azotés des porcs à l’engrais : approche par méta-analyse

Abstract : Reducing dietary crude protein (CP) is a recognized solution for reducing nitrogen (N) emissions, which is a major issue for pig farming. The effect of this nutritional solution is well documented, but there is no quantitative summary in the literature that combines data on N excretion and ammonia emissions. A meta-analysis was performed to quantify benefits of reducing dietary CP on pig N balance and ammonia emissions, and to develop predictive equations based on animal performance. Articles included in the meta-analysis studied effects of CP reduction on N balance and/or N emissions of fattening pigs (20-120 kg), were published from 1990-2019 and used iso-digestible lysine diets. Thirty articles were used, which corresponded to 43 trials and 126 treatments. The general linear model procedure of MINITAB (2019) was used to build regression models, including a fixed trial effect. Reducing dietary CP linearly reduces total N excretion, urinary N excretion, fecal N excretion and ammonia emissions by 8.2%, 10%, 3.2% and 10%, respectively, per percentage point of CP reduction (P<0.001). Nitrogen efficiency is improved by 1.6 percentage points per percentage point of CP reduction. Furthermore, 28% of urinary N excretion, the main source of ammonia emissions, is volatilized as ammonia (P<0.001). The proportion of N excreted in urine is reduced by 0.9 percentage points per percentage point of improved N efficiency (P<0.001). This study highlighted positive impacts of reducing CP on N emissions from fattening pigs and then quantified them.
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https://hal.inrae.fr/hal-03212989
Contributor : Emilie Bernard <>
Submitted on : Friday, April 30, 2021 - 10:04:53 AM
Last modification on : Monday, May 10, 2021 - 8:25:01 AM

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Léa Cappelaere, Jaap van Milgen, Kostas Syriopoulos, Aude Simongiovanni, William Lambert. Quantification des bénéfices de la baisse de protéine sur les rejets azotés des porcs à l’engrais : approche par méta-analyse. 53. Journées de la Recherche Porcine, Ifip; Inrae, Feb 2021, En ligne, France. ⟨hal-03212989⟩

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