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Evaluation of a new muramidase supplement on the growth performance of weaned piglets. Effet de la supplémentation d'une nouvelle muramidase sur les performances de croissance des porcelets en post-sevrage
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International audience. Exogenous enzymes are widely used in monogastric feed to increase the digestibility of raw material constituents, but little is done targeting the nutrient pool made up of intestinal bacterial cell wall debris. To evaluate effects of dietary supplementation with a new muramidase on the growth performance of weaned piglets, three trials were performed. In the three trials, weaned piglets (mean age and weight: 25 d and 8.1 kg) were homogeneously distributed in pens (n= 120, 40, 128, respectively; according to age and weight) into two treatment groups: a control group and a basal diet supplemented with 50,000 LSU(F)/kg feed. The diet, in mash form, was based on wheat, barley and soybean meal (with milk powder in starter diets) and was offered ad libitum for 42 days. Health status, abnormal behavior and occurrence of post-weaning diarrhea (from normal feces to severe diarrhea) were monitored throughout the experimental period. Feed intake and body weight per pen were measured, and the feed conversion ratio (FCR) and average daily gain were calculated. Analysis of variance (ANOVA) was performed on the aggregated data of the three trials. In all trials, health status of the piglets was very good, and even though diarrhea incidence was low, supplementation with muramidase significantly decreased fecal scores. Significantly higher average daily weight gain and lower FCR were observed with muramidase supplement, as shown by the clear effect during the grower phase (d15-42). Overall, the results allow us to conclude that muramidase supplementation at 50,000 LSU(F)/kg improves the growth performance of weaned piglets. . L’utilisation d’enzymes exogènes dans la ration des porcs est une pratique courante pour améliorer la digestibilité des constituants de l’aliment et améliorer ainsi les performances des animaux, voire en cascade moduler leur microbiote. Récemment, des effets positifs sur les performances zootechniques et le soutien de la fonctionnalité gastrointestinale des poulets ont été démontrés grâce à l’utilisation d’une nouvelle enzyme, la muramidase (EC 3.2.1.17) (Sais et al., 2020). Contrairement aux enzymes exogènes courantes telles que les phytases ou les xylanases qui améliorent la digestibilité d’une fraction de la ration, cette muramidase a une action spécifique sur la fraction constituée par la biomasse microbienne intestinale. En effet, elle hydrolyse les débris formés par les peptidoglycanes des parois de bactéries mortes et n’a pas d’effet antimicrobien (Lichtenberg et al., 2017).L’objectif de cette étude est d’évaluer, à partir des données issues de trois essais, l’effet de la muramidase sur les performances zootechniques du porcelet sevré.
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