Institute of Livestock and Grassland Science, NARO


The Institute of Livestock and Grassland Science, NARO (NILGS) is the Japanese research institution for livestock and grassland. We promote the technical developments that integrate studies on grassland, animal feed production, livestock production and animal waste treatment and reuse. NILGS's mission is to contribute to increasing the production of safe and high-quality animal products and improving the self-sufficiency rate of feed by utilizing land resources effectively. Throughout our research, we develop technologies that benefit both present and future livestock production, support our plentiful diet, and finally, contribute to the conservation and sustainable use of national land through development of the livestock industry.


Estimation of nutrient excretion factors of broiler and layer chickens in Japan

Press release on March 6, 2017

image The nitrogen (N), phosphorus (P), potassium (K) and magnesium (Mg) excretion factors of broiler and layer chickens in Japan were estimated using the latest available data. Since the current values of excretion factors were based on the data obtained almost 20 years ago, there was a large difference in the values and the amount of nitrogen excretion was over-estimated. Based on the new nitrogen excretion factor and the number of chickens, as well as an estimate of the nitrous oxide (N2O) emission from chicken excretions, it is estimated that the greenhouse gas emission decreased by 640,000 tons/year (35% decrease, as CO2 equivalent). The new value of nitrogen excretion factor will be recorded as greenhouse gas inventory report in Japan. In the future, this will be used in assessment of the environmental impact caused by the excretion of chickens. According to the new estimated factors, it is clearly evident that the amount of nitrogen and the greenhouse gas emission is found to be smaller than those calculated using the excretion factors obtained 20 years ago indicating that the impact on the environment has been greatly reduced in the current poultry farming. The new nutrient excretion factor will lead to appropriate use of fertilizer derived from livestock manure such as compost. It will also help in properly evaluating a balance of the demand and supply of nutrients and domestic nitrogen flow in a particular region. Read more.

Sexing day-old chicks using endoscope

Press release on July 26, 2016

image The NILGS has developed a novel method for sexing day-old chicks using an endoscope system. In this method, the probe of the endoscope is inserted from the cloaca into the intestine of a chick, and the presence of testes or ovary can be observed through the wall of the intestine and clearly viewed on a computer monitor. An overall accuracy of 90.2% was obtained in the present study which could be improved by continuous training in the handling of the endoscope. Furthermore, this endoscope system is not only very efficient but is also easy to use and requires no specific skills for simple operation or about 1 or 2 weeks for more precise sexing. Read more.

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