JPH06237704A - Artificial feed for euryphagous silk worms - Google Patents

Abstract

PURPOSE:To provide the title silk worm feed which is prepared by pelletizing defatted soybean flour, corn flour or defatted rice bran into porous disks of a specific porosity at a low cost because the feed is free from mulberry leaf and a gelling agent, thus palatable feed can be prepared in each silk worm farm. CONSTITUTION:The objective feed is prepared by pelletizing (A) defatted soybean flour containing no mulberry leaf powder and no gelling agent, (B) a corn powder, (C) defatted rice bran and (D) rape seed lees into disks of 30 to 70% porosity. These starting substances are mixed in a twin-screw extruder (100rpm, 130 deg.C barrel temperature), heat-pressed under 10kg/cm<2> pressure and extruded out of the die into the air and cut into raised pellets. The feed is recommendably immersed in water and given to silk worms at 70 to 75% water content.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an artificial feed which can be fed to juvenile silkworms and whole-aged silkworms.

[0002]

2. Description of the Related Art Artificial diet feeding of silkworms has been introduced into juvenile silkworm cooperative breeding and has contributed to labor saving and stabilization of breeding. However,
Most of the breeding is limited to the 1st to 2nd instars, and the desirable penetration rate of the 1st to 3rd instars is extremely low in order to exert the merit of artificial feed raising. Further, from the current state of decline of the sericulture industry, it is strongly demanded to achieve epoch-making labor saving by co-breeding the first to fourth instars with artificial feed and growing mulberry leaves only at the fifth instar. In addition, it is expected that all-age artificial feed will grow in the future.

Currently, the most important factor hindering the popularization of artificial feed cultivation for the first to third instars is the high feed cost. The cause of the high feed cost is due to the two materials added to the feed. That is, it is a gelling agent such as mulberry powder added to promote the feeding of silkworms and agar added to maintain a high water content, and the unit price of both materials is high, and the price ratio of both of them to the total feed cost. Is about 50%.

Further, mulberry leaf powder is liable to qualitatively change depending on the harvesting time of mulberry, environmental conditions such as weather conditions, and the drying treatment method, which causes unstable feeding results. Further, when the gelling agent is used, when the feed is made into pellets having a hole, the gelling agent absorbs water, which makes it difficult to process and makes it difficult to obtain a stable feed.

As a method for preparing and supplying artificial feed, a feed maker manufactures a wet feed and sends it to a co-breeding facility, and a feed preparation center in a prefecture or region purchases powder feed from the maker, thereby There is a method in which body feed is manufactured and distributed to co-houses. In the former case, the shipping cost is high and the storage period of the wet body feed is limited. In the latter case, the feed preparation concentrates just before the sericulture period, so the preparation capacity of the feed preparation center becomes a limiting factor and the supply amount is limited. Furthermore, the annual operating period is short, and there is a big problem in terms of depreciation of facility costs.

[0006]

SUMMARY OF THE INVENTION In view of the above points, the present invention makes use of the eating habits of omnivorous silkworms to reduce the cost of feeds without adding mulberry powder and gelling agent to artificial feeds at all. The objective of the present invention is to stabilize the feeding, and to obtain an artificial feed having a good eating quality which can be appropriately prepared in each breeding place without receiving the feed from the feed preparation sensor or the like.

[0007]

[Means for Solving the Problems] Low-priced feed materials such as defatted soybean powder, corn powder, defatted rice bran, and rapeseed powder without adding mulberry powder and gelling agent are formed into perforated pellets with a porosity of 30% to 70%. did.

[0008]

EXAMPLES An example of the artificial diet for silkworms according to the present invention will be described below.

[0009]

[Table 1]

Of the feeds shown in Table 1, feeds (A) and (B) are feeds for 1st to 2nd instars and 3rd instars, and 4% of mulberry leaf powder was added to each. Further, the feed (C) is a feed for the 4th instar, and is a feed to which mulberry powder and gelling agent are not added. The feed (C) is provided to silkworms as pellets having porosity, and the pellets are prepared as follows.

When a raw material containing a large amount of starch and vegetable protein is kneaded by heating under pressure with an extruder, the starch is gelatinized and the vegetable protein is organized. When the dough is shaped in the die part and discharged into the atmosphere, the extrudate is depressurized from high pressure to atmospheric pressure in the die part, so that the steam inside the raw material expands rapidly and expands several times. The extrudate becomes porous and increases in volume.

In the same expansion product as above, after the dough is placed in a pressure vessel and sealed and heated, the lid is suddenly opened, and the water content contained in the raw material is converted to water vapor due to the pressure drop, and the content is rapidly increased. It can be made by expanding, but this means is a batch type, changing the shape of the extrudate,
Various additives cannot be added.

Although a swelling product can be produced by either a single-screw extruder or a twin-screw extruder, depending on the type of the additive, the swelling product of the uni-screw extruder increases due to the fluidity of the raw material, which causes pressure unevenness immediately before the die. In addition to variations in shape, the single-screw extruder has high shearing force, and care must be taken to prevent nutritional damage of vitamin C and vitamin mixtures.

A specific example of the twin-screw extruder will be shown below. The feed powder was put into a twin-screw extruder (screw rotation speed 100 rpm, barrel temperature 130 ° C.), and the raw material was heated and pressurized at a pressure of 10 kg / cm ² to bring it into a molten state.
Next, the melted raw material is extruded into the atmosphere from the extruder die part to be expanded, and the expanded product is cut by a pelletizer to give 30% to 70%.
A porous pellet feed with a porosity of% was prepared. The porosity can be arbitrarily changed depending on the degree of pressurization. If the pressure is increased, the size of the voids can be increased and the porosity can be increased, but the cross-sectional area of the produced pellet is also increased. Therefore, when the pellets produced have the same diameter, the diameter of the die is reduced and a higher pressure is applied in order to obtain a pellet having a large porosity or a large void size. Before being fed to the silkworm, the feed is dipped in a certain amount of distilled water and fed to the silkworm with a water content of about 70 to 75%.
If the porosity is low when fed to the silkworm, the silkworm is not suitable for feeding, and if the porosity is too high, the water content at the time of immersion becomes too high, which is not suitable.

Next, breeding of silkworms with the feed shown in Table 1 will be described.

Feeds for 1st to 2nd instars (A), feeds for 3rd instars (B) and non-added 4th instars feeds (C) were prepared by adding 4% of mulberry powder. Feeds (A) and (B) were prepared by a conventional method, and only feed (C) was pelletized by a twin-screw extruder.

As the silkworm cultivar to be tested, a No. 601 × Medium 601 (Asagiri) designated as a wide-spread variety was used.

The 1st to 2nd instars of omnivorous silkworms were bred with the feed (A) prepared by a conventional preparation method without pelleting, and the 3rd instars were similarly bred with the feed (B). Use 4
Test section (first section) fed with (C) feed pelletized to 5th instar, (A) feed in 1st to 2nd instar, and (B) in 3rd instar
As a feed, a test section (second section) in which 4th instar was raised by (C) diet and only 5th instar was grown by mulberry leaves was set. In all of these, the water reconstitution condition was 20 ° C. for 20 minutes. Furthermore, although the administration of the feed was the same, the test section No. 3 was changed to 50 ° C for 5 minutes.
Ward, the 4th Ward was made.

The number of tested silkworms was 100 per group (50 males and 50 females), and the breeding temperature was 26 ° C at 5th instar and 25 ° C at 5th instar, and dark conditions were used except during working.

The breeding and cocoon quality results are shown in Table 2.

[0021]

[Table 2]

From these results, there was no difference between the 4th instars in the 5th day in all the groups, and the 4 sleep weight was slightly heavy in the 5 minutes group at 50 ° C. under water reconstitution, but the growth was good in each group. The 5th instar was slightly shorter in the mulberry field than in the mulberry field, but the growth in the 5th year was also extremely good in the pellet diet, and there was no significant difference in spitting / cocooning and pupae rate from the mulberry field. The cocoon weight was higher in the pellet feed group than in the mulberry leaf cultivation, but the cocoon layer weight and the cocoon layer rate were slightly superior in the 5th instar mulberry leaf cultivation. The results obtained with the mulberry powder and the pellet feed containing no gelling agent obtained here are considered to be equivalent to those of the conventional artificial feed containing these materials. There was no significant difference between the two water reconstitution conditions set. From these results, it was found that 4 to 5 years old were bred with the above pellet feed and good results were obtained.

Next, the conventional feed preparation method, that is, the first method
Add a certain amount of water to the feed powder in the table (D) and mix, 1
Table 3 shows the results of cutting and feeding the feed prepared by the method of cooling and solidifying after boiling at 00 ° C for 30 minutes and feeding it to the 4th to 5th instars and the feed of pellet feed of (C). It was

[0024]

[Table 3]

Comparing the results of the first ward and the second ward, there is no significant difference between the pupae and cocoon weights of the pupae and cocoon weights, and although the cocoon layer weight and the cocoon layer percentage are slightly smaller than those of the control group, they are sufficient and practical. It can be said that the cocoon quality can be evaluated. In other words, it was found that pellet feed, which is significantly simpler and labor-saving than the conventional feed preparation and feeding method, can be expected to have the same breeding and cocoon quality results as the conventional feed.

[0026]

INDUSTRIAL APPLICABILITY As described in detail above, the present invention provides an inexpensive feed material such as defatted soybean powder, corn powder, defatted rice bran and rapeseed powder without adding mulberry powder and gelling agent with a porosity of 30
% -70% perforated pellets made it possible to obtain a low-cost artificial feed consisting of inexpensive livestock feed materials without using expensive mulberry powder or carrageenan.

Further, since the pellets are porous, the feed can be appropriately absorbed in the breeding ground and given to the silkworms, so that it is not necessary to receive the wet feed from the manufacturer or the feed preparation center. It is possible to reduce intermediate costs such as shipping costs, and also to improve the storage advantages of feed.

[Procedure amendment]

[Submission date] May 8, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

[0006]

SUMMARY OF THE INVENTION In view of the above points, the present invention makes use of the eating habits of omnivorous silkworms to reduce the cost of feeds without adding mulberry powder and gelling agent to artificial feeds at all. and with stabilization of the breeding, without the supply of feed from the feed preparation Centers chromatography or the like, and to obtain a food having good artificial diet which can be suitably prepared in each breeding plants.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction content]

[0024]

[Table 3]

(72) Inventor Hiroaki Yanagawa 5-23 Kariya-cho, Ushiku-shi, Ibaraki Prefecture (72) Inventor Yuhide Ito 2245-5 Ooka, Numazu-shi, Shizuoka Prefecture

Claims (1)

[Claims] 1. An inexpensive feed material such as defatted soybean powder, corn powder, defatted rice bran and rapeseed powder without adding mulberry powder and gelling agent is made into perforated pellets with a porosity of 30% to 70%. An artificial feed for wide-spreading silkworms.