Effect of cassava chips on quality of silage from fresh forage sorghum plus Cavalcade forage legume hay mixtures

Readers are free to share (to copy, distribute and transmit) and to remix (to adapt) the work under the conditions of Attribution, Noncommercial, and Share Alike (see http://creativecommons.org/licenses/by-nc-sa/3.0/)Two experiments investigated the effects on silage quality of adding cassava chips at a range of levels to a sorghum forage plus Cavalcade legume hay mixture at ensiling at the Experimental Farm, Khon Kaen University, Thailand. Cavalcade hay was 15% of chopped sorghum fresh weight and cassava chips were added at 0, 5, 10 and 15% of chopped sorghum fresh weight. The first experiment utilized sorghum and Cavalcade main crops and the second used the ratoon crop of sorghum and 2nd cut of Cavalcade. Dry matter percentage of ensiled mixtures and silages increased (P<0.05) with an increase in cassava chip levels in both experiments, but CP and NDF concentrations decreased (P<0.05). Dry matter degradability increased (P<0.05) with an increase in cassava chip levels up to 10% in both main and ratoon/2nd cut silages. Digestible energy and metabolizable energy of both silages increased significantly with an increase in cassava chip levels up to 10% for main crop and 15% for ratoon/2nd cut crops. While addition of cassava chips improved digestibility and energy content of silage, it lowered CP concentration. Use of fresh Cavalcade instead of hay should increase the CP levels and should be investigated along with animal feeding studies to test acceptance and animal performance.Peer reviewe

What happens when the market shifts to China ? the Gabon timber and Thai cassava value chains

Rapid economic growth in China has boosted its demand for commodities. At the same time, many commodity sectors have experienced declining demand from high-income northern economies. This paper examines two hypotheses of the consequences of this shift in final markets for the organization of global value chains in general, and for the role played in them by southern producers in particular. The first is that there will be a decline in the importance of standards in global value chains. The second is that there will be increasing constraints in the ability of low-income producers to upgrade to higher value niches in their chains. Detailed case studies of the Thai cassava industry and the Gabon timber sector confirm both these hypotheses. It remains to be seen how widespread these trends are across other sectors.Environmental Economics&Policies,Food&Beverage Industry,Markets and Market Access,Economic Theory&Research,Labor Policies

What happens when the market shifts to China? The Gabon timber and Thai cassava value chains

Rapid economic growth in China has boosted its demand for commodities. At the same time, many commodity sectors have experienced declining demand from high income northern economies. This paper examines two hypotheses of the consequences of this shift in final markets for the organization of global value chains in general, and for the role played in them by southern producers in particular. The first is that there will be a decline in the importance of standards in global value chains. The second is that there will be increasing constraints in the ability of low-income producers to upgrade to higher value niches in their chains. Detailed case studies of the Thai cassava industry and the Gabon timber sector confirm both these hypotheses. It remains to be seen how widespread these trends are across other sectors

Removal of Cyanides from Gadung (Dioscorea hispida Dennst.) Tuber Chips using Leaching and Steaming Techniques

Gadung (Dioscorea hispida Dennst.) has been considered as one of staple foods in Indonesia. However, its high cyanides content has limited its utilisation for commercial food production. This work is aimed to investigate the removal of cyanides content from gadung tuber chips through two consecutive treatments, i.e. leaching and steaming and to propose mathematics model for the leaching process. The results showed that processing water flow rate and leaching time affected the efficiency of cyanides removal in the leaching process. The proposed mathematical model was able to represent the removal of cyanides through leaching process very well. The cyanides content removal was also found to be affected by steaming time. Best processing condition was at leaching using 5.00 10-5 m3.s-1 for 3,600 s, followed by steaming for 3,600 s to obtain cyanides content of 29.9 mgkg-1. While the yielded gadung tuber chips are considered as safe for consumption, further research on physicochemical characteristic of the gadung tuber flour is necessary for its utilisation consideration

What happens in global value chains when the markey shifts from the north to the south?

This paper charts the evolution of financial and economic crisis in the global economy and argues that the likely outcome will be sustained growth in the two very large Asian Driver economies of China and India and stagnation in the historically dominant northern economies. Given the nature of demand in low income southern economies, it is likely to be reflected in sustained demand for commodities, with other southern economy producers in global value chains being forced into lower levels of value added. Standards are likely to be of considerably reduced significance in value chains feeding into China and India. These issues are considered in the light of evidence drawn from the experience of Thai exporters of cassava, and Gabonese exporters of timber

Effect of processing conditions on cyanide content and colour of cassava flours from West Africa

The evolution of cyanide content and colour were monitored during the processing of lafu, traditional flour and improved flour from five cassava cultivars from Benin. In addition, the total phenol, polyphenoloxidase (PPO), peroxydase (POD) and linamarase activities were assessed. The processing of cassava in lafu and improved flour proved superior for producing safe and white non-fermented and fermented cassava flours with total cyanide mean values of 16.6 and 11.4 mg HCN/kg, db and DE values of 9.2 and 12.1, respectively. Detoxification appeared to be only linked to processing, in particular to the size reduction level of cassava roots, regardless of the initial cyanide level and the linamarase activity of the fresh roots. Cassava flour yellowness was closely linked to the phenol content (r = 0.95) that decreased after steeping and pressing. The PPO and POD activities did not appear to be linked to flour discoloration. (Résumé d'auteur

The diversity of postharvest losses in cassava value chains in selected developing countries

The extent of physical and economic postharvest losses at different stages of cassava value chains has been estimated in four countries that differ considerably in the way cassava is cultivated, processed and consumed and in the relationships and linkages among the value chain actors. Ghana incurs by far the highest losses because a high proportion of roots reach the consumers in the fresh form. Most losses occur at the last stage of the value chain. In Nigeria and Vietnam processors incur most of the losses while in Thailand most losses occur during harvesting. Poorer countries incur higher losses despite their capacity to absorb sub-standard products (therefore transforming part of the physical losses into economic losses) and less strict buyer standards. In monetary terms the impact of losses is particularly severe in Ghana and estimated at about half a billion US dollar per annum while in the other countries it is at the most about USD 50 million. This comparison shows that there are no “one-size-fits-all" solutions for addressing postharvest losses but rather these must be tailor-made to the specific characteristics of the different value chains