The issues of food security are an important aspect of every country for its social and economic growth and the eradication of poverty. It is particularly crucial for satisfying the needs of the ever-growing populatio...The issues of food security are an important aspect of every country for its social and economic growth and the eradication of poverty. It is particularly crucial for satisfying the needs of the ever-growing population in developing countries. Agriculture is the backbone of the people and the economy for developing countries, particularly in highly populated countries such as India, China and South East Asia. The world population is anticipated to rise to 8.3 billion by 2030 and to 9.2 billion by 2050. By that time, to feed the growing population, food production must double to keep pace with the escalating food demand. Agricultural commodities showed increases of 58.9% in import dependency ratio （IDR） as compared to 32.2% in 2013. Thus, this study attempts to review and explore the challenges of food security as well as the opportunities of the seed industry in Malaysia.展开更多
We evaluated the dietary protein requirements of juvenile turbot (Scophthalmus maximus L.) and their effects on aquatic quality. Five experimental diets were formulated containing 450, 480, 500, 520, and 540 g/kg. Eac...We evaluated the dietary protein requirements of juvenile turbot (Scophthalmus maximus L.) and their effects on aquatic quality. Five experimental diets were formulated containing 450, 480, 500, 520, and 540 g/kg. Each diet was randomly assigned to triplicate groups of juvenile turbot (mean initial body weight 34.5 ± 5.5 g) for 88 d. Both the weight gain ratio and feed efficiency increased with increasing dietary protein up to 500 g/kg, but no further improvement was detected when dietary protein levels were >500 g/kg. Protein intake and digestion increased with protein levels, while fecal nitrogen and nitrogen content in seawater increased only when dietary protein exceeded 500 g/kg. Protein digestibility was highest at intermediate dietary protein levels. Chemical oxygen demand, nitrite-nitrogen (NO2--N) and phosphatic-phosphor (PO43--P) levels increased in the rearing water as dietary protein levels increased. The optimum eco-nutrition level of dietary protein for juvenile turbot was 500 g/kg under the current experimental conditions. The diets containing 540 and 500 g/kg protein had similar growth rates and feed conversion ratios, but levels of ammonia (NH4+) and nitrogen were considerably higher in the water and feces, respectively, at the higher level of dietary protein. The difference in the pattern of change between body weight gain and ammonia concentration in water with increasing dietary protein is described by rhomb characteristics.展开更多
文摘The issues of food security are an important aspect of every country for its social and economic growth and the eradication of poverty. It is particularly crucial for satisfying the needs of the ever-growing population in developing countries. Agriculture is the backbone of the people and the economy for developing countries, particularly in highly populated countries such as India, China and South East Asia. The world population is anticipated to rise to 8.3 billion by 2030 and to 9.2 billion by 2050. By that time, to feed the growing population, food production must double to keep pace with the escalating food demand. Agricultural commodities showed increases of 58.9% in import dependency ratio （IDR） as compared to 32.2% in 2013. Thus, this study attempts to review and explore the challenges of food security as well as the opportunities of the seed industry in Malaysia.
基金Supported by the National High Technology Research and Development Program of China (863 Program) (No. 2006AA100305)National Agricultural Science and Technology Achievements Commercialization Program (No. 2008GB2C100109)the Knowledge Innovation Program of Institute of Oceanology, Chinese Academy of Sciences (No. L49032503)
文摘We evaluated the dietary protein requirements of juvenile turbot (Scophthalmus maximus L.) and their effects on aquatic quality. Five experimental diets were formulated containing 450, 480, 500, 520, and 540 g/kg. Each diet was randomly assigned to triplicate groups of juvenile turbot (mean initial body weight 34.5 ± 5.5 g) for 88 d. Both the weight gain ratio and feed efficiency increased with increasing dietary protein up to 500 g/kg, but no further improvement was detected when dietary protein levels were >500 g/kg. Protein intake and digestion increased with protein levels, while fecal nitrogen and nitrogen content in seawater increased only when dietary protein exceeded 500 g/kg. Protein digestibility was highest at intermediate dietary protein levels. Chemical oxygen demand, nitrite-nitrogen (NO2--N) and phosphatic-phosphor (PO43--P) levels increased in the rearing water as dietary protein levels increased. The optimum eco-nutrition level of dietary protein for juvenile turbot was 500 g/kg under the current experimental conditions. The diets containing 540 and 500 g/kg protein had similar growth rates and feed conversion ratios, but levels of ammonia (NH4+) and nitrogen were considerably higher in the water and feces, respectively, at the higher level of dietary protein. The difference in the pattern of change between body weight gain and ammonia concentration in water with increasing dietary protein is described by rhomb characteristics.
