JPS63169942A - Feed for silkworm - Google Patents

Abstract

PURPOSE:To obtain a feed for silkworm forming gel with reduced water separa tion, reducing silkworm mortality, by adding gelan gum as a kind of colloid to mulberry leaf powder. CONSTITUTION:Mulberry leaf powder is blended with 0.4% gelan gum as a kind of colloid to give the aimed feed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to feed for silkworms, and an object thereof is to industrially advantageously produce feed for silkworms.

[Conventional technology and its drawbacks]

The food for silkworms is fresh mulberry leaves, but in order to increase the growth rate of silkworms, defatted soybean flour, soybean protein, etc. are used in combination with raw mulberry leaves as feed, and if necessary starch, vitamins, etc.
It is known to be used in combination with carbohydrates, etc. In order to produce feed from this, it is necessary to prepare an aqueous solution of agar, mix this with the above-mentioned pulverized material, form a gel, and crush this.

The amount of agar required to form this gel is 1.2-2.5% (
Weight; the same applies hereafter).

The problem with this feed is syneresis of the agar gel. This is because silkworms have the habit of moving only forward and enter the agar gel food containing crushed feed, and if the food is humid, the silkworms will die. That is, syneresis of agar gel is a major problem.

[Means for solving problems]

Here, gellan gum, a type of colloid, is used as a gelling agent instead of agar. Of course, gellan gum alone is not only used for gelation, but also other glues (such as xanthan gum, locust pea gum, far gum, carrageenan, gelatin,
Pectin, gum karaya, gum arabic, carboxymethyl cellulose, etc.) may be used in combination with at least one of the following ingredients.

Since gellan gum has the property of forming a gel with very little syneresis in a small amount, the present invention has achieved its purpose here.

The correctness of this invention will be proved by the following experimental examples.

Experimental Example Appropriate amount of sample, 4 parts of dried mulberry leaf powder, inorganic salts (
For example, salts such as K, Ca, Mg, etc.) 1 part at 90°C!
4 Dissolve in hot water for 10 minutes while stirring.

A commercially available standard jelly cup was filled with 2001 and left to stand in a cooling water bath at 8°C for 2 hours to form a gel.

The gel strength at this time was measured using a card meter model Mochi/L/301 manufactured by Iio Electric Co., Ltd.

Lid the gel in this standard jelly cup and add 80
It was left standing in a constant temperature chamber at °C for 48 hours. Syneresis at this time was measured.

Example: 300 parts of a powder mixture of 5 parts of calcium carbonate, 5 parts of monobasic potassium phosphate, 30 parts of soybean protein, 5 parts of vitamin O, 30 parts of powdered dried mulberry leaves, and 2 parts of gellan gum.
The mixture was dispersed in water heated to 0°C with stirring, and mixed and dissolved using a kneader at 100°C or higher for 30 minutes. It was poured into a mold and allowed to gel. It was crushed with a hand mixer and used as feed for silkworms.

Feed with very little syneresis could be made using gellan gum, which used about 1/4 of the amount of agar. With feed made from agar, 13 out of 100 silkworms died due to syneresis.
However, with the feed made with this gellan gum, there were no deaths that were thought to be due to syneresis.

*Death due to syneresis: Death due to head stuck in feed

Claims (1)

[Claims] A method for producing silkworm feed characterized by containing gellan gum, a type of colloid