اثرات مکمل سازی جیره با منابع مختلف اوره بر نرخ آزاد سازی نیتروژن، کینتیک تخمیر، فراسنجه های تولید گاز و ناپدید شدن مادۀ مغذی در شرایط برونتنی

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