THE CORN SILAGE WITH PINEAPPLE RIND AND THE PRODUCING METHOD OF THAT Technical Field The present invention relates to corn silages with pineapple rind and a producing method thereof. More particularly, the present invention relates to corn silages with pineapple rind, which are produced by mixing corn plants with pineapple rind at the weight ratio of 9: 1 to 8.5 : 1.5 ; pressing the mixture so as to remove air, while forming the mixture into a hexahedral shape; introducing the formed material into a light-shading vinyl bag; sealing the vinyl bag while maximally removing air ; and subjecting the formed material in the vinyl bag to natural lactic acid fermentation with native lactic acid bacteria in an anaerobic condition for 15-20 days or 7-10 days.

Background Art Silages are feeds which are produced by storing grasses, wild grasses, soiling crops and root vegetables, etc. having high water content, in a silo, and subjecting the stored plants to lactic acid fermentation, so that the reproduction of putrefactive bacteria or decomposing fungus is inhibited, thereby preventing nutrient loss and increasing conservative property. These silages are also called ensilages.

Among silages, the corn silage is widely used in terms of its good properties.

In addition, the silages may be also prepared using Indian millets, barleys, such as rye, grasses, and the like.

The existing corn plants are prearranged on bidding and difficult to ferment due to its insufficient sugar content, and corn silages incoming from China are of inferior quality. Thus, considering these facts, the present inventors aimed at corn silage containing pineapple rind.

Korean Patent Application No. 10-1999-0018933 (entitled"com stalk feeds for animals and a preparing method thereof') discloses a preparing method of corn stem feeds for animals, in which corn stalks are fermented in a soft wet condition in such a

manner that nutrients are not destructed and fibrous tissue are reactivated.

Korean Patent Application No. 10-2000-0009914 (entitled"strains suitable for fermentation of plant silages having low sugar content and a producing method of silages using the same") discloses a novel lactobacillus plantarum NLRI-101 strain suitable for fermentation of plant silages having low sugar content, and a method of preparing silages using the same.

Korean Patent Application No. 10-1997-0062465 (entitled"animal feeds of combinations of high-density dried grasses and haylages") discloses a method in which dried feeds and fermented feeds are mixed together, pressed and sealed, thereby producing a transport feed unit for livestocks.

However, the above prior publications are directed to the use of corn stalks and specific strains, or an improvement in storage and transport methods. Thus, there is a need for the development of livestock feeds that are more economical, rich in nutrients, and easy to distribute.

Disclosure of Invention Accordingly, the present invention is to provide good corn silages with pineapple rind with increased palability, which-are prepared by natural lactic fermentation without addition of sugars and without inoculation of specific lactic acid bacteria.

The present invention relates to corn silages with pineapple rind, and to a producing method thereof.

According to the present invention, the corn silages with pineapple rind are produced by mixing corn plants with pineapple rind at the weight ratio of 9: 1 to 8. 5 : 1. 5 ; pressing the mixture so as to remove air, while forming the mixture into a hexahedral shape; introducing the formed material into a light-shading vinyl bag ; sealing the vinyl bag while maximally removing air; and subjecting the formed material in the vinyl bag to natural lactic acid fermentation with native lactic acid bacteria in an anaerobic condition for 15-20 days or 7-10 days.

The pineapple contains vitamin C at the amount of 60mg/100g, which is the

highest of fruits. Also, it has a large amount of juice at their fruit. Moreover, it contains about 10% of sucrose and about 1% of citric acid, so that it has sweet and sour tastes.

Mixing of the corn plants with the pineapple rind facilitate the lactic acid fermentation by supplement of sugars. The pineapple is fermented after mixing with the corn plants, so that the taste and flavor of the pineapple are conserved so as to improve palability of the silages by animals, when the silages are unsealed and fed to the animals.

Furthermore, where the pineapple is mixed with the corn plants, the sugar juice of pineapple plays a role like pickled fishes of Kimchi as a Korean traditional food, so that the mixture is anaerobically fermented. Thus, the mixture is more sufficiently aged, and not decomposed even at the water content of 65 to 75%.

Hereinafter, the method of producing the corn silages containing pineapple rind according to the present invention will be described in detail with reference to Fig. 1.

First step: Cutting of corn plant Corn plants at a yellow ripe stage (water content of 68-70%) are harvested and cut at a position of 20-30 cm from a root portion upward. The lower portion of the cut corn plants is discarded and only the upper portion is collected.

All portions of the collected plants including corn stalks, corn leaves and corn kernels are cut into a size of 0.75-1. 5 cm in a cutter.

At this time, some salt may be sprinkled on the collected plants in order to suppress the crispness of the plants.

Second step: Collection of pineapples Pineapple rind consisting of pineapple rinds and cores is collected, which remains after a pineapple fruit is used for the production of juices or canned goods.

If necessary, the collected pineapple rind may be cut into the same size as the corn plant.

Third step: Mixing The cut corn plants and the collected pineapple rind are mixed with each other at the weight ratio of 9: 1 to 8.5 : 1.5.

Fourth step: Pressing and forming The mixture is pressed in a press so as to remove air therefrom. The pressed material is cut and formed into a hexahedral shape which is 25cm wide, 30-35cm long and 70-80cm high.

As it is formed into the hexahedral shape of a suitable size, it is easy to store and transport.

At the time, water content is 60 to 75%.

Fifth step: Sealing The formed material is introduced in a light-shading vinyl bag which is then sealed while maximally removing air.

Sixth step: Fermentation The formed material contained in the sealed bag is subjected to natural lactic acid fermentation with native lactic acid bacteria for 15-20 days at 15-18 °C, or for 7- 10 days at 27-36 °C, thereby producing the pineapple rind-containing corn silages of the present invention.

During initial few hours, the formed material is aerobically fermented by oxygen remaining in the inside of the bag. Once the formed material reaches an aerobic condition, its acidity is decreased to less than pH 4.0.

Brief Description of the Drawings FIG. 1 is a flowchart showing a producing method of corn plant silages containing pineapple rind according to the present invention.

Best Mode for Carrying Out the Invention The present invention will hereinafter be described in further detail by examples and test examples. It should however be borne in mind that the present invention is not limited to or by the examples.

Test Example 1: Test for measuring change in acidity according to ratio of

addition of pineapple rind Corn plants at a yellow ripe stage were harvested, and cut at a position of 20 cm from a root portion upward. The lower portion of the cut plants was discarded, and only the upper portion was collected.

The collected plant portion including corn stalks, leaves and kernels were cut into a size of about 1 cm in a cutter.

Pineapple rind consisting of pineapple rinds and cores was purchased, which remains after the flesh of pineapple fruits was removed for the production of juices or canned goods.

The cut corn plants and the pineapple rind were mixed with each other as indicated in Table 1 below.

The respective mixtures were introduced into a press and pressed by application of pressure so as to remove air. As a result, five materials for each group were formed, which are 25 cm wide, 30 cm long and 70 cm high, respectively.

The respective formed materials were introduced into a light-shading vinyl bag which was then sealed while maximally removing air.

The formed material in the sealed bag was subjected to natural lactic acid fermentation at 27 °C for two weeks, during which a change in acidity was measured.

Results are shown in Table 1.

Table 1: Change in acidity according to mixed amounts of corn plants and pineapple rind Group Corn plant Pineapple rind pH after pH after pH after 2 days 5 days 2 weeks A 100 kg 0 kg 5 4. 7 4. 1 B 95 kg 5 kg 4. 5 4. 3 4. 0 C 90 kg 10 kg 4. 0 3. 7 3. 5 D 85 kg 15 kg 3.9 3.5 3.3 E 80 kg 20 kg 3. 8 3. 5 3. 0 F 70 kg 30 kg 3.7 3.4 3.0 According to the provision of National Veterinary Research and Quarantine Service, the suitable pH of silages is less than pH 4.0 at which foot-and-mouth disease

does not occur. However, Group A having 0% of added pineapple rind and Group B having 5% of added pineapple rind exhibited a pH of more than 4.0 which is incongruent to the standard. Also, these groups showed the swelling of the vinyl bags caused by bulging phenomenon, so that they were not easy to store and transport.

Groups C to F to which the pineapple rind had been added at the amount of 10 to 30% relative to the total weight of the respective silages were maintained at suitable pH after 5 days, and exhibited the insignificant bulging phenomenon.

In view of the desired pH, the bulging phenomenon and the material cost, it is suitable that the ratio of addition of pineapple rind is in the range of 10 to 15%.

Example 1 : Production of corn plant silages containing pineapple rind in temperate regions Core plant silage containing pineapple rind was produced in Korea that is a temperate region.

Corn plants at a yellow ripe stage were harvested, and cut at a position of 20 cm from a root portion upward. The lower portion of the cut plants was discarded, and only the upper portion was collected.

90 kg of the collected corn plants including corn stalks, leaves and kernels were cut into a size of about 1 cm in a cutter.

10 kg of pineapple rind consisting of pineapple rinds and cores was purchased, which remains after the flesh of pineapple fruits was removed for the production of juices or canned goods.

The cut corn plants and the pineapple rind were mixed with each other.

The resulting mixture was introduced into a press and pressed by application of pressure so as to remove air, while forming the mixture into a hexahedral shape which is 25 cm wide, 30 cm long and 70 cm high.

The formed material was introduced into a light-shading vinyl bag which was then sealed while maximally removing air.

The formed material in the sealed bag was subjected to natural lactic acid fermentation in a sealed anaerobic condition at 15 °C for 18 days, thereby producing the pineapple rind-containing corn silage of the present invention.

The produced silage was unsealed and fed to animals.

The conventional silage exhibited the anaerobic deterioration only at one day after its unsealing in the summer season, but the pineapple rind-containing corn silage of the present invention did not exhibit the anaerobic deterioration for 3 or 4 day after its unsealing.

Example 2: Production of corn plant silages containing pineapple rind in torrid région Core silage containing pineapple rind was produced in Vietnam that is a torrid region.

Corn plants at a yellow ripe stage were harvested, and cut at a position of 20 cm from a root portion upward. The lower portion of the cut plants was discarded, and only the lower portion was collected.

90 kg of the collected corn plants including corn stalks, leaves and kernels were cut into a size of about 1 cm in a cutter.

10 kg of pineapple rind consisting of pineapple rinds and cores was purchased, which remains after the flesh of a pineapple fruit was removed for the production of juices or canned goods.

The cut corn plants and the pineapple rind were mixed with each other.

The resulting mixture was introduced into a press and pressed by application of pressure so as to remove air, while forming the mixture into a hexahedral shape which is 25 cm wide, 30 cm long and 70 cm high.

The formed material was introduced into a light-shading vinyl bag which was then sealed while maximally removing air.

The formed material in the sealed bag was subjected to natural lactic acid fermentation in a sealed anaerobic condition at 30 °C for 8 days, thereby producing the pineapple rind-containing corn silage of the present invention.

The produced silage was unsealed and fed to animals.

The conventional silage exhibited the anaerobic deterioration only at one day after its unsealing in the summer season, but the pineapple rind-containing corn silage of the present invention did not exhibit the anaerobic deterioration for 3 or 4 day after

its unsealing.

Industrial Applicability As described above, the present invention provides good corn silage containing the pineapple rind. Since the pineapple rind is mixed with the corn plants, the corn silage has the supplemented sugars, the improved taste and flavor, and the increased palability, while it does not need to be inoculated with specific lactic acid bacteria.