JPS61146154A - Method for raising silkworm - Google Patents

Abstract

PURPOSE:To obtain good growth of silkworm and good cocoon result, by mixing nutrient mixture prepared by mixing an organic acid therewith to exhibit a specific pH value in mixing with a specific amount of water, applying the resultant mixture to the surfaces of mulberry leaves, and feeding the leaves to the silkworm. CONSTITUTION:A nutrient mixture, e.g. corn or fish meal, prepared by adding an organic acid, e.g. citric acid, therewith to give 4.0-5.0 pH in mixing with water and preferably adding an antibiotic or antimicrobial substance thereto, is mixed with the water in an amount of 1.5-3.0 times based on the nutrient mixture and the resultant mixture is applied to the surfaces of mulberry leaves. The resultant mulberry leaves are fed to raise silkworm. EFFECT:The amount of mulberry leaves to be fed can be reduced and many silkworms expressed in terms of unit mulberry field can be raised.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for rearing silkworms in the sericulture industry, and more specifically to a method for rearing silkworms in which the silkworms are fed supplementary feed supplemented with nutrients to the complete collection. Regarding the law.

(Conventional technology) Needless to say, sericulture technology consists of the technique of raising silkworms by feeding them with whole silkworms, and some artificial feed for young silkworms has been put into practical use. For the purpose of increasing the cocoon yield per unit of mulberry field by reducing the amount of mulberry feeding, the development of so-called supplementary feed, in which various nutrients are added to the whole collection and fed to the silkworms, has been desired and research has been carried out for many years. . As a result, some feeds containing soybean powder, sugars, vitamins, and amino acids have come into practical use as additive feeds.

The method of using this supplementary feed is to spray it directly on the surface of the entire crop, or to sprinkle the supplementary feed after adding water to the leaf surface. However, in the conventionally known method of using supplementary feed, the supplementary feed may not adhere uniformly to the surface of the entire collection, or the evaporation of the sprayed water may create a humid environment in the silkworm locus, leading to diseased silkworms due to the proliferation of bacteria. often occurred frequently. As a result, there is a difference in the amount of feed eaten, resulting in non-spitting silkworms, occurrence of large and small facets, uneven development process, etc., and a significant decrease in the amount of cocoons collected due to the occurrence of death due to softening disease. Therefore, it has been difficult to obtain good growth of silkworms and cocoon performance comparable to that achieved by rearing entire silkworms.

(Problems to be solved by the invention) There are the above-mentioned difficulties in the use of conventional feed supplements, but the present invention does not have these difficulties and has good breeding performance, and also reduces the amount of mulberry per unit of mulberry field by reducing the amount of mulberry feeding. This provides a method that allows a large number of silkworms to be raised.

(Means for Solving the Problems) As a result of various studies on the method of rearing silkworms using additive feed, the present invention has found that when mixed with water, the pH is 4.0 to 5.0.
The present invention was completed based on the discovery that the problems caused by conventional additive feeds could be overcome by applying a nutritional mixture adjusted to the following to the mulberry leaves and then feeding and rearing the silkworms. It is.

That is, the present invention has a pH of 4.0 to 5.0 when mixed with water.
1.5 to 3 to a nutrient mixture with organic acids added to 0
．． It is a silkworm breeding method characterized by adding a mixture of 0 times the amount of water and attaching it to the surface of mulberry leaves, and then feeding and rearing the silkworms.The purpose is to obtain good cocoon performance. Moreover, the object of the present invention is to provide a method for raising silkworms that exhibits extremely excellent management effects by reducing the amount of mulberry feeding.

In the present invention, first, an organic acid is added to the nutrient mixture. Examples of organic acids to be added include citric acid, fumaric acid,
Examples include glucono delta-lactone and the like, and a single substance or a mixture thereof can be appropriately selected and used.

The organic acid is added to the nutrient mixture so that the pH is between 4.0 and 5.0. At this time, in order to further suppress the proliferation of bacteria, it is more effective to lower the pH of the nutrient mixture, but if the pH of the nutrient mixture when mixed with water is 4.0 or less, silkworms will not be able to feed. Also, if the pH is over 5.0, antibiotics and antibacterial substances will not be able to demonstrate their ability, and the deterioration of the silkworm environment will result in many dead silkworms.
It is preferable to add an organic acid to the nutrient mixture to adjust the H value to 4.0 to 5.0. The amount of organic acid added to the nutrient mixture is about 1.0 to 7.0%.

A nutrient mixture to which organic acids are added refers to a mixture of nutrients necessary for the growth of silkworms and cocoon production, such as grains such as corn, milo, barley, wheat, and rice, their processed products, and defatted soybeans. , plant materials such as yeast; animal feed materials such as fish meal and meat bone meal; mulberry leaf powder; vitamins; A mixture of one or more of the following raw materials is used: a spreading agent such as α-starch; and others.

In particular, one or more antibiotics selected from tetracyclines such as chlortetracycline hydrochloride, aminoglycosites such as kanamycin sulfate, macrolides such as oleandomycin, polypeptides such as colistin sulfate, or sorbic acid or It is desirable to add one or more selected from antibacterial substances such as sorbate, propionic acid or propionate and amprolium to the nutrient mixture.

Next, 1.5 to 3.0 times the amount of water is added to the silkworm nutrient mixture containing an organic acid and an antibiotic and/or an antibacterial substance, mixed uniformly, and this mixture is applied to the surface of a mulberry leaf.

As for the amount of water to be added, if it is small, it will be difficult to attach the nutrient mixture to the collected leaves, and if it is too large, the nutrient mixture will flow from the mulberry leaf surface onto the silkworm bed.
．． It is better to add 5 to 3.0 times the amount of water.

As for the amount of the nutrient mixture added, it is desirable to add the nutrient mixture to the collected leaves in a range of 5 to 15% in terms of dry matter.

Any method may be used to apply the mixture to the surface of the mulberry leaves, but it is preferable to use an electric spray gun.

A nutrient mixture for silkworms with 1.5 to 3.0 times the amount of water has a high viscosity (in order to spray it evenly on the mulberry leaves, the pressure of the air compressor connected to the spray gun used must be increased to 1.
7 kg/cm” is desirable.

When these mixtures are sprayed onto the leaves using a spray gun under such pressure, the water and air pressure during spraying will not damage the mulberry leaf surface, and the additive feed consisting of these nutritional mixtures will be evenly distributed on the leaf surface. Can be dispersed.

Next, the collected leaves with the nutrient mixture attached thereto are placed on the silkworm locus, and the silkworms are fed and reared, or the nutrient mixture is added with water to the collected leaves that have been previously fed on the silkworm locus, and the leaves are attached to the silkworms. Feed and raise.

(Effects of the invention) Since conventional whole rearing using additive feed did not require pH control or use in combination with antibiotics or antibacterial substances, it was possible to obtain good growth of silkworms and cocoon performance comparable to whole rearing. However, according to the present invention, the pH of the nutrient mixture attached to the mulberry leaf surface is as low as 4.0 to 5.0, so the ability of antibiotics and antibacterial substances is fully demonstrated.
Even if large amounts of bacteria are attached to the mulberry leaf surface, they do not multiply, so the silkworms are less susceptible to diseases, and it is possible to obtain good growth of silkworms and cocoon performance comparable to that of whole-breeding.

Conventionally, there is no good method for attaching a nutrient mixture for silkworms with 1.5 to 3.0 times the amount of water added to the mulberry leaf surface in terms of physical properties, and it has not been carried out at all, but the method described above This method allows for easy dispersion and is economically very effective.

Moreover, by using the additive feed, the amount of mulberry feeding can be reduced, and by reducing the amount of mulberry feeding, more silkworms can be reared per unit of mulberry field, which contributes to sericulture management.

(Example) Example 1 2.8 kg of the silkworm nutrient mixture containing the organic acids and antibiotics shown in Table 1 was thoroughly mixed with twice the amount of water to adjust the pH to 4.
2 and then uniformly sprayed on the mulberry leaf surface using a spray gun, and 1,000 5th instar silkworms were fed and reared with this to investigate cocoon performance and silkworm reduction rate.

In addition, the control plot was a plot in which 1,000 5th-instar silkworms were raised with the standard amount of 40 kg of whole grains, comparison plot A was a plot in which the amount of mulberry supplied was reduced by 30%, and the conventional method was used for the plots in which the amount of mulberry supplied was reduced by 30%. After adding 2.8 kg of the direct nutrient mixture alone, the feeding plot was designated as comparison plot B, and silkworms were reared in the same manner to investigate cocoon performance and silkworm destruction rate.

The test plots and feeding amounts are as shown in Table 2.

Table 1 Nutrient mixture Table 2 Test plot (feeding amount) The breeding results are shown in Table 3.

The cocoon performance and silkworm reduction rate achieved by the rearing method of the present invention were significantly better than in the comparison plot, and the results were also extremely good compared to the control plot.

Table 3 Breeding results

Claims (1)

[Claims] After adding a mixture of 1.5 to 3.0 times the amount of water to a nutrient mixture to which an organic acid has been added so that the pH becomes 4.0 to 5.0 when mixed with water, the mixture is attached to the mulberry leaf surface. A method of raising silkworms that is characterized by feeding and rearing the silkworms.