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Influence of AspergiZZus oryzae Fermentation Extract on Forage Intake, Site of Digestion, In Situ Degradability, and Duodenal Amino Acid Flow in Steers Grazing Cool-Season Pasture1f2

Influence of AspergiZZus oryzae Fermentation Extract on Forage Intake, Site of Digestion, In Situ Degradability, and Duodenal Amino Acid Flow in Steer

Influence of AspergiZZus oryzae Fermentation Extract on Forage Intake, Site of Digestion, In Situ Degradability, and Duodenal Amino Acid Flow in Steers Grazing Cool-Season Pasture1f2   (Citations: 15)
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Ten ruminally and duodenally cannu- lated (326 _+ 28 kg) and four esophageally fistulated (394 k 23 kg) steers grazing cool-season pasture throughout the growing season were used to evaluate the influence of Aspergillus oryzae fermentation ex- tract (AO) supplementation on intake, forage nutri- ent utilization, and duodenal amino acid flow. Steers grazed a predominately smooth brome (Bromus iner- mis L.) pasture, and measurements were taken in three periods (June, July, and August). Steers were dosed daily at 0700 via the ruminal cannula with A0 (2 g of A0 per steer daily; DM basis) or not supplemented with AO. Each period consisted of 18 d for adaption to A0 and 7 d for collection. Forage N was greater, and ADF was lower (P < .lo), in June than in July and August. Ruminal pH, ammonia, total VFA concentration, and VFA proportions were not affected (P > .lo) by A0 supplementation. In vitro DM digestibility (percentage) and forage OM intake (gramsikilogram of BW) were greater (P < .lo) for steers supplemented with AO. Ruminal and total tract NDF and ADF digestibilities were lower in June and greater during July (P < .lo) in steers supplemented with AO. Total tract percentage of N disappearance was lesser during June and greater (P < .lo) during July for steers receiving AO. Total, essential, and nonessential amino acid flows were increased (P < .lo) by both A0 supplementation and advancing season. In situ rate of ruminal CP degradation was not affected ( P < .lo) by treatment during any period. The slowly degraded forage N fraction, as determined by an in situ technique, was increased (P < .lo) during July and August in steers that received A0 relative to unsupplemented steers. Our data indicate that supplementation with A0 of steers grazing cool- season pasture altered intake and digestion measure- ments, but that responses seemed to vary with season.
Published in 2010.
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    • ...With uncertainty about the way in which probiotics actually work, it is perhaps not surprising that there are some reported inconsistencies in results of probiotic use (Martin and Nisbet, 1992; Caton et al. 1993; Williams and Newbold, 1996; Fuller, 1999)...

    T. A. Jenkins. The Use of Fermentation Extracts in Animal Feeds

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