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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

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Animal Nutrition 2016年第4期2卷 334-338页

作者： Chalong Wachirapakorn Krung Pilachai Metha Wanapat Pawadee Pakdee Anusorn Cherdthong Department of Animal Science Faculty of Agriculture Khon Kaen University Tropical Feed Resources Research and Development Center (TROFREC) Department of Animal Science Faculty of Agriculture Khon Kaen University Faculty of Agricultural Technology Rajabhat Mahasarakham University

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 x 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). ground corn cobs was used for up to 100% of the total roughage without affecting milk production. Moreover, ruminal pH, temperature, ammonia-nitrogen(NH_3-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). 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.

关键词： Dairy cow ground corn cob Rice straw Rumen fermentation Tropical area

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A Research on the Usage of corn cob in Producing Lightweight Concrete

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Natural Resources 2021年第10期12卷 339-347页

作者： Sermin Polat Department of Irrigation and Drainage Faculty of Agricultural Engineering University of Ege Bornova-Izmir Turkey

In this study, the possibility of using corn cobs as an organic aggregate in producing lightweight concrete has been investigated. First, some important physical properties of corn cob have been determined in the laboratory. These properties are as follows: weight to volume ratio (unit weight), water absorption rate and granulometric analysis. Later on, 4 concrete mixtures have been prepared according to the workability of concrete and standards specified in Turkey. After that, unit weight, heat transmissibility coefficient and 28-day pressure strength of these 4 concrete samples have been determined using machines measuring these properties. The 28-day pressure endurance value has been found between 1.4 - 56.25 kgf/cm2, heat transmissibility coefficient has been found between 0.19 - 0.35 Kcal/m∙h∙˚C and unit weight of samples have been found between 800 - 1520 kg/m3. Lastly, these properties of concrete samples have been compared with other lightweight materials being used in

关键词： ground corn cob Lightweight Concrete Aggregate Granulometric Analisi Pressure Strength

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