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首页> 外文期刊>Journal of Applied Animal Research >Comparison of diet digestibility, rumen fermentation, rumen rate of passage, and feed efficiency in dairy heifers fed ad-libitum versus precision diets with low and high quality forages
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Comparison of diet digestibility, rumen fermentation, rumen rate of passage, and feed efficiency in dairy heifers fed ad-libitum versus precision diets with low and high quality forages

机译：饮食消化率的比较，瘤胃发酵，瘤胃率，以及乳房小母牛的饲料效率，喂养广告 - 利比与高质量饲料的精密饮食

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This study compared ad-libitum versus precision-fed diets with 2 forages and different levels of neutral detergent fibre (NDF) to evaluate rumen fermentation, diet digestibility, feed efficiency, and digesta passage rate. Eight Holstein heifers (18.4?±?0.6 mo) fitted with rumen cannulas were used in a 2-factor, split-plot, Latin square design. The whole-plot factor was feeding system with ad-libitum or precision feeding and 4 heifers in each plot. The subplot included 2 factors: forage quality and NDF content. Diets were formulated to provide the same energy level (0.234 Mcal of ME intake/kg of empty body weight 0.75 for precision-fed heifers and 110% of previous intake for ad-libitum-fed heifers. Forage quality and NDF level affected dry matter intake. Mean rumen pH was lower for ad-libitum than for precision-fed diets and volatile fatty acid concentrations were affected principally by forage quality. Ad-libitum diets showed faster rate of passage for solid feeds and fluids, increased rate of digestion, and shorter retention time in the rumen. In addition, both high NDF and low quality forage modified rumen passage rate and shortened retention time. Feed efficiency was improved in precision-fed heifers.
机译：本研究比较了AD-libitum与精密喂养的饮食，具有2种饲料和不同水平的中性洗涤剂纤维（NDF），以评估瘤胃发酵，饮食消化率，饲料效率和Digesta通道率。八个荷斯坦小母牛（18.4？±0.6μm）配有瘤胃插管，用于2因素，分裂图，拉丁方形设计。整个绘图因子在每个绘图中喂食系统，以及每个绘图中的4个小母牛。子图包括2个因素：饲料质量和NDF内容。配制饮食以提供相同的能量水平（ME INTAKE / KG的0.234 MCAL / kg空体重0.75，用于精密喂养的小母牛，占AD-libitum喂养的小母牛的先前摄入量的110％。饲料质量和NDF水平影响干物质摄入。令人醒略的pH值对于ad-libitum而言，对于精密喂食，并且挥发性脂肪酸浓度主要通过饲料质量来影响挥发性脂肪酸浓度。Ad-libitum饮食显示出更快的固体饲料和流体的通道率，增加的消化率增加，更短瘤胃中的保留时间。此外，高NDF和低质量的饲料改性瘤胃通道率和缩短保留时间。在精密喂养的小母牛母牛中提高了饲料效率。

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