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DIGESTIBILIDAD in situ DE DIETAS CON RASTROJO DE MAÍZ O PAJA DE AVENA CON ENZIMAS FIBROLÍTICAS In situ DIGESTIBILITY OF CORN STOVER OR OAT STRAW DIETS WITH FIBROLYTIC ENZIMES

DIGESTIBILIDAD in situ DE DIETAS CON RASTROJO DE MAÍZ O PAJA DE AVENA CON ENZIMAS FIBROLÍTICAS In situ DIGESTIBILITY OF CORN STOVER OR OAT STRAW DIETS

DIGESTIBILIDAD in situ DE DIETAS CON RASTROJO DE MAÍZ O PAJA DE AVENA CON ENZIMAS FIBROLÍTICAS In situ DIGESTIBILITY OF CORN STOVER OR OAT STRAW DIETS WITH FIBROLYTIC ENZIMES  
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In order to evaluate the effect of a fibrolytic enzymatic product on digestibility and ruminal fermentation, four ruminally cannulated sheep (58 kg BW) were used in a 4×4 Latin square design with a 2×2 factorial arrangement of treatments. The factors were: forage type (corn stover and oat straw), and enzyme level (zero and 1 g Fibrozyme ® kg forage − − − − −1 MS). There were no differences (p>0.05) among the four treatments for DM, NDF and ADF digestibility at 12, 24, 48 or 72 h. Ruminal pH was not different during the sampling hours for all the treatments; however, at 4 h pH was higher (p≤ ≤ ≤ ≤ ≤0.05) for corn stover diets than for oat straw diets, although there was not effect due to fibrolytic enzymes (p>0.05). Molar concentration of acetic acid was higher (p≤ ≤ ≤ ≤ ≤0.05) at 12 h for treatments without enzyme than for treatments with enzyme (41.73 vs 33.40 mM). Fibrolytic enzymes did not affect propionic acid concentration (p>0.05). Butyric acid was reduced (p≤ ≤ ≤ ≤ ≤0.05) by enzyme at 12 h (10.03 vs 6.01 mM). Fibrolytic enzymes modifyed ruminal fermentation, but did not improve the digestibilty of the diets.
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