Effect of starch substitution by rapeseed oil on enteric methane emission and performance in dairy cows fed grass-silage based diets
2019
Martin, Cécile | Ferlay, Anne | Benouda, Mohamed | Eugène, Maguy | Unité Mixte de Recherche sur les Herbivores - UMR 1213 (UMRH) ; Institut National de la Recherche Agronomique (INRA)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS) | FACCE JPI GLOBAL NETWORK
International audience
Show more [+] Less [-]English. This work aimed to study the effect of energy source supplementation on methane emission and performance in dairy cows fed grass-silage based diets. Eight multiparous lactating Holstein cows were used in a replicated 4 x 4 Latin square design with 4 periods of 28 days. Animals were limited fed (95% ad libitum) with 4 grass silage based diets supplemented with 4 concentrates in which starch was gradually substituted by increasing amounts of rapeseed oil (1.5, 3.0 and 4.5% on a dry matter basis). Diets were formulated to be iso-energy and iso-protein to meet individual energy and protein requirements for production. Methane emissions were measured (days 23 to 27) when animals were in open-circuit respiration chambers. Daily intake, milk production and composition were also recorded. Intakes of gross energy and fiber were similar among diets, starch intakes decreased linearly (P < 0.0001) and ether extract intake increased linearly (P < 0.001) with increasing rapeseed oil amounts. Methane emissions (g/d), yield (g/kg dry matter intake) and intensity (g/kg milk) decreased linearly (P < 0.01) when starch was replaced by rapeseed oil in the diets. Milk production and composition differ among diets (P < 0.001). The linear decrease in milk fat yield with increasing amounts of oil suggests a milk fat depression with changes in milk fatty acids profile. Starch substitution by rapeseed oil decreased both enteric methane emission and performance in dairy cows fed grass-silage based diets.
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