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首页> 美国卫生研究院文献>Animal Nutrition >Effect of ground corn cobs as a fiber source in total mixed ration on feed intake milk yield and milk composition in tropical lactating crossbred Holstein cows
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Effect of ground corn cobs as a fiber source in total mixed ration on feed intake milk yield and milk composition in tropical lactating crossbred Holstein cows

机译：混合总配比中作为纤维来源的玉米芯玉米粉对热带泌乳杂交荷斯坦奶牛的采食量产奶量和乳成分的影响

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摘要

The aim of this study was to evaluate the effect of ground corn cobs (GCC) as a sole fiber source in total mixed ration (TMR) on feed intake, milk yield and milk composition in tropical lactating crossbred Holstein cows. Four multiparous crossbreds Holstein Friesian dairy cows with an initial body weight (BW) of 415.5 ± 26.20 kg were used in a 4 × 4 Latin square design. The dietary treatments of TMR contained a roughage-to-concentrate ratio of 40:60. The roughage source was used at different ratios of GCC to rice straw (RS) at 100:0, 82.5:17.5, 67.5:32.5, and 50:50 for TMR1 to TMR4, respectively. The results revealed significant improvements in intake of dry matter, protein, neutral detergent fiber (NDF) and metabolizable energy (ME) for TMR1 and TMR2 (P < 0.05), while the digestibility of nutrients was not altered by the treatments (P ≥ 0.05). Ground corn cobs was used for up to 100% of the total roughage without affecting milk production. Moreover, ruminal pH, temperature, ammonia-nitrogen (NH3—N) and volatile fatty acid (VFA) concentrations were not impacted by the treatments (P > 0.05). However, milk yield was significantly different among the GCC:RS ratios (P < 0.05) and was the highest in TMR1 and TMR2 (13.1 kg/d), while the milk compositions were not changed (P > 0.05). The results imply that using GCC as a whole roughage source significantly improved nutrients intake and milk yield in dairy cows raised in tropical areas.
机译：这项研究的目的是评估热带泌乳杂交荷斯坦奶牛的总混合日粮（TMR）中作为唯一纤维来源的玉米芯（GCC）对饲料摄入，产奶量和产奶量的影响。在4×4拉丁方形设计中使用了四头杂种荷斯坦黑白花奶牛，其初始体重（BW）为415.5±26.20公斤。 TMR的饮食处理中粗饲料与精矿的比例为40:60。对于TMR1至TMR4，分别以100：0、82.5：17.5、67.5：32.5和50:50的GCC与稻草（RS）的不同比率使用粗料来源。结果显示，TMR1和TMR2的干物质，蛋白质，中性洗涤剂纤维（NDF）和代谢能（ME）的摄入量显着改善（P <0.05），而营养物的消化率并未因处理而改变（P≥0.05） ）。磨碎的玉米芯用于总粗饲料的100％，而不会影响牛奶产量。此外，瘤胃的pH，温度，氨氮（NH3-N）和挥发性脂肪酸（VFA）的浓度不受处理的影响（P> 0.05）。但是，GCC：RS比率之间的牛奶产量显着不同（P <0.05），在TMR1和TMR2中最高（13.1 kg / d），而牛奶成分没有变化（P> 0.05）。结果表明，在热带地区饲养的奶牛中，将GCC用作整体粗饲料可显着提高营养摄入和产奶量。

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