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Journal of Animal Science, Vol 70, Issue 3 915-923, Copyright © 1992 by American Society of Animal Science

JOURNAL ARTICLE

Effect of a supply of raw or extruded rapeseeds on digestion in dairy cows

A. Ferlay, F. Legay, D. Bauchart, C. Poncet and M. Doreau
Laboratoire de la Lactation et de l'Elevage des Ruminants, INRA de Theix, St Genes-Champanelle, France.

The influence of extruded oilseeds on total tract digestibility and ruminal digestion in dairy cows was studied in three cows fed a hay-concentrate (60.5/39.5; 3.7% fatty acids in diet on DM basis) control diet (C) or the same diet supplemented with raw (R) or extruded (ER) rapeseeds (8.0% fatty acids in diet DM). The experimental design was a 3 x 3 Latin square design. Compared with diet C, diets containing rapeseed decreased ruminal OM digestibility (9.5%, P less than .10) and increased (P less than .05) the proportion of propionate in ruminal fluid VFA. Extrusion had no effect on DM and OM total tract digestibilities and increased (P less than .10) N digestion. Microbial N flow at the duodenum was calculated taking into account solid-adherent bacteria (SAB) and liquid-associated bacteria (LAB). Duodenal flows of total, SAB, and LAB of OM and N did not change with diet. Extrusion of the rapeseeds did not modify (P less than .10) the proportion of bacterial N at the duodenum and had no effect on crude fiber digestibility. This trial demonstrates that rapeseeds in hay-based diets can be fed at levels of up to 14% of the diet without adversely affecting crude fiber digestibility.


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Copyright © 1992 by the American Society of Animal Science.