مکمل آنزیم فیبرولیتیک بوسیله بولومای شبیه به رفتار غذا، هضم مواد مغذی و تخمیر شخم در تلیسههای جرزی که از رژیمهای غذایی مبتنی بر سیلاژ یا سس گوجهفرنگی ذرت تغذیه می کنند
|کد مقاله||سال انتشار||تعداد صفحات مقاله انگلیسی||ترجمه فارسی|
|131497||2017||30 صفحه PDF||سفارش دهید|
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Publisher : Elsevier - Science Direct (الزویر - ساینس دایرکت)
Journal : Animal Feed Science and Technology, Volume 231, September 2017, Pages 29-37
Sugarcane is relatively affordable in subtropical regions and can be used as a forage source for cattle; however, its low fiber degradation in the rumen may impair diet digestibility and animal performance. The objective of this study was to evaluate the influence of a fibrolytic enzyme product in dairy heifers fed either corn silage or sugarcane silage-based diets on nutrient intake and digestibility, eating behavior, energy and N utilization, ruminal fermentation, microbial protein synthesis, and blood metabolites. Twelve Jersey heifers [8Â Â±Â 2.5 mo age and 160Â Â±Â 15Â kg of live weight (LW), meanÂ Â±Â SD] were assigned to a Latin square design with 2Â ÃÂ 2 factorial treatment arrangement. Experimental periods had 14Â days for treatment adaptation, 6Â days for sampling, followed by 5Â days of wash out. Treatment sequences consisted of: 1) diet with 549Â g/kg DM sugarcane silage as forage source (SS); 2) diet with 653Â g/kg DM corn silage as forage source (CS); 3) sugarcane silage and enzyme product (SSE; Fibrozymeâ¢, Alltech, Nicholasville, KY), SS diet providing heifers with 20Â g/d enzyme product through ruminal bolus; and 4) corn silage and enzyme product (CSE), CS diet providing heifers with 20Â g/d enzyme product through ruminal bolus. Enzyme product was supplied once a day before the morning feeding. Heifers fed SS showed lower (PÂ =Â 0.001) nutrient intake than those fed CS. Enzyme product had no effect on feed intake, but it increased (PÂ â¤Â 0.048) DM digestibility in heifers. An effect of the interaction between forage and enzyme was observed (PÂ =Â 0.006) on NDF digestibility, in which enzyme supply increased NDF digestibility in 126Â g/kg DM for heifers fed sugarcane silage. Moreover, enzyme supply increased (PÂ =Â 0.030) the time spent eating of heifers, but it decreased (PÂ =Â 0.012) the efficiency of cud chewing â DM (g/h). No interaction effect was noticed between forage and enzyme on eating behavior measures. Enzyme supply decreased (PÂ =Â 0.012)Â N absorbed by heifers. An interaction between forage and enzyme was detected on urinary N, in which SSE treatment showed the lowest value of N in urine. Except for the higher (PÂ =Â 0.012) ruminal propionate molar proportion in cows fed CS than those fed SS, no effects (PÂ â¥Â 0.212) of forage, enzyme, or forage and enzyme interaction were described on ruminal fermentation measures. Heifers fed sugarcane silage had lower (PÂ =Â 0.008) microbial protein synthesis estimation than those fed corn silage. Enzyme provision increased (PÂ =Â 0.045) urinary urea concentration and excretion (mg/kg LW), and decreased (PÂ â¤Â 0.012) daily urea clearance in heifers. In addition, no effect of the interaction between forage and enzyme (PÂ â¥Â 0.226) was described on N renal metabolism of heifers. Although the enzyme provision had no effect on NDF digestibility in heifers fed corn silage, it increased NDF digestibility in heifers fed sugarcane silage. The enzyme supply increased the time animals spent eating, but had no effect on ruminal fermentation of heifers.