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(1174), or with grass srlage (X2637). Concentrations of water-soluble carbohydrates were higher (P < 0.05) in inoiulated than in control silages. Although inoculants appeared to increase the numbers of lactit acid producing bacteria (LAB) at ensiling, post-ensiling numbets (cfu g-1) of yeasts and molds.were lower (P < 0'05) in inoculated than in control silages. Lactic acid concentrations and pH were similar arnong the silages and variations in the growth of yeast and mold populations-could not be explained by differences in the production of volatile fatty acids (VFA) among silages.Inoculation of barlly silage with either inoculanr increased (P < 0.01) the average daity gain of lambs. A digestibilrty expelT:lt with 12 growing ram lambs showed that inoculants did not alter (P > 0.05) DM intzike, feed efficiency or the digestion of DM' organic iatter, icid detergent fiber (ADF) and neutral derergent fiber (NDF). Nitrogerr intake and retention were greater (P < 0'05) inlambs fed silage inoculated wrth ll74 as compared withiontrol silage. Yeast populations were increased (P < 0.05) in control and ll7 4 after 2-dof exposure to air but it requirid 13 d for a similar yeast population to be established inX2637 silage. Increases in the mold populations within the silages were noted after 2, 5 and 13 d of exposure to air for control' 117 4 and X2637 ' respectively. Theiemperature of control silage increased (P < 0.05) 2 dafter exposure to air, whereas increases in temperature were delayed for 4 d in lli4 and g d in X26i7. Temperatures rose as high as 30'C in control silage, but did not exceed24"C in inoculated silages during the 13 d period.

. L'addition de 0,6 kg t -1 d'un cultivar transgénique de pomme de terre à une ration pour poulets de chair à base d'orge CDC Silky en tant que source de β-glucanase améliore (P < 0,05) la valorisation des aliments de 8,8 %. À la concentration de 1,2 kg t -1 , la viscosité des digest dans l'iléon diminue (P < 0.05) de 42 %. La pomme de terre transformée pourrait devenir un additif enzymatique intéressant avec une meilleure expression et/ou activité du gène.

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