has described the different molasses as follows:
- Integral high-test molasses is produced from unclarified sugarcane juice. Because it is concentrated from unclarified sugarcane juice, heavy incrustations and scum deposits lead to frequent mill interruptions and therefore to increased factory maintenance costs.
- High-test molasses is basically the same as integral high-test molasses. Howere it does not raise manufactory concern as integral high-test does.
- A molasses (first molasses) is an intermediate byproduct resulting from first sugar crystal extraction (A sugar) at raw sugar factory. A molasses contains 80-85% DM. If it has to be stored, it should be inverted in order to prevent crystallization.
- B molasses (second molasses). It has approximately the same DM content as A molasses but contains less sugar and does not crystallize spontaneously.
- C molasses (final molasses, blackstrap molasses, treacle) is the end product at raw sugar factory level. It still contains considerable amounts of sucrose (approximately 32 to 42%). C molasses does not crystallize and can be found in liquid or dried form as a commercial feed ingredient.
- Syrup-off (liquor-off, jett) is the end product from the centrifugation of the final refined masecuite in a raw sugar refinery. Normally, syrup-off is sent to the raw sugar section of the refinery where it is reprocessed in order to recover more sucrose. Due to its high content of sucrose (90-92% DM), it is an excellent energy source for monogastrics but can be an expensive.
- Refinery final molasses is the byproduct of refined sugar extraction. It has a very similar composition to that of C molasses produced in a raw sugar factory and it is stored in the same tanks.
- In some countries the juice is extracted in a simple animal or mechanical driven press, then boiled in open vats. In this rudimentary process, pan (uncrystallized) sugar is produced and the byproduct molasses is called "melote". It contains only 50% DM.
Sugarcane molasses are also used for alcohol (rhum or fuel ethanol) production and the distillery process yields vinasses that can also be used in animal feeding.
Approximately 3 to 7 tons of molasses can be produced from 100 tons of fresh sugar cane (
Pérez, 1997). Molasses composition varies highly and depends on cane varieties, climate and processes (
Pérez, 1995). Approximately 60 countries produce sucrose from sugarcane (
Pérez, 1995).
It should be noted that the type of molasses is rarely mentioned when molasses are traded or when their feed value is investigated.
Utilization
Sugarcane molasses has several important roles in livestock feeding, due to the nutritive, appetizing and physical properties of its sugar content. Molasses is rather difficult to handle because of its viscosity: it is rarely fed directly in its liquid form but instead mixed to other ingredients (
Caldwell, 2001).
Binding agent, anti-dust agent and palatability enhancer
The main use of cane molasses is as a binding agent in feed mills. Molasses allows the feed granules to stick together during the pelleting process and produce pellets that are less likely to break down during transportation and passage through feeding equipment (
Blair, 2007). Molasses also reduces dustiness in fine-particled feeds.
Due to its sucrose content, it improves the palatability of feeds and can even mask the bitter taste of urea (Blair, 2007). The amount used in dry feeds is usually small, lower than 15% DM and usually in the 2-5% range (
Blair, 2007;
Fuller, 2004).
Silage additive
Molasses is a valuable additive for silage making when ensiling conditions are difficult or when the forage is a poor quality grass (warm-season grass) or a legume. Molasses provides readily fermentescible energy that promotes lactic acid bacteria development and subsequently reduces pH and improve silage quality. However, molasses may not be helpful when silage is made with maize, sorghum or cool-season grasses since they already contain high amounts of energy and adding molasses might result in detrimental yeast development (
Adesogan et al., 2010;
Sansoucy, 1991). Molasses can be added to grass at about 5% (
Fuller, 2004).
Urea carrier
Molasses, in either liquid or solid form, is often used as a carrier for urea and other additives (
Pérez, 1995). Its can be combined with urea, minerals and vitamins to make solids bricks called molasses-urea blocks or multi-nutrient blocks, for inistance to supplement low quality diets (see the
Molasses/urea blocks datasheet) (
Forsberg et al., 2002).
Energy source
Molasses can be used as an energy source for livestock, particularly in situations where grains are unavailable or too expensive (
Chaudhary et al., 2001). This utilization is common for ruminants, but also occurs in pigs and poultry. Certain countries, like Cuba, have developed feeding systems where molasses has a central part. In ruminants, molasses is fed as a supplement to poor quality roughage, during droughts for instance. It can also be mixed with rice bran, oil meals or with non-protein N (urea for instance) in order to enhance rumen activity (
Chaudhary et al., 2001;
Bedingar et al., 1990;
Rana et al., 1982). During the 1983-1985 famine in Ethiopia, molasses was been used as an emergency feed for the survival of reeding cattle (
Menbere, 1986).
Other uses
In the tropics, molasses is also used in combination with other ingredients, such as roughages, poultry litter or animal by-products. For instance, fresh fish, fish offal and snails can be preserved by mixing 50:50 with final molasses, then fed with B molasses to pigs, ducks and geese (
Pérez, 1995).