GB2026027A

GB2026027A - Bacterially produced animal feedstuff

Info

Publication number: GB2026027A
Application number: GB7924506A
Authority: GB
Original assignee: SP KONSTRUKTTEKHNOLOG BJURO
Current assignee: SP KONSTRUKTTEKHNOLOG BJURO
Priority date: 1978-07-13
Filing date: 1979-07-13
Publication date: 1980-01-30
Also published as: AT365046B; NL7905437A; NO792327L; GB2026027B; ATA483779A; FR2430728B1; FR2430728A1; JPS5548354A; DE2928377A1

Abstract

The feedstuff has a pH of 4.0 to 5.0, a dry solids content of 20.9 to 37% by weight and a crude protein content of 5.8 to 8.8% by weight, and is obtained by fermentation of a nutrient medium containing sources of carbohydrates, proteins, mineral salts and manure or poultry droppings, using a bacterial leaven consisting of thermophilic bacteria of the genus Lactobacterium or Streptobacterium and mesophilic bacteria of the genus Streptococcus, Azotobacterium, Shermanni, Bacterium acidi propionicum, Escherichia coli or Pseudomonas produced by way of a long-term symbiosis and adaptation of the bacteria to a nutrient medium containing sources of carbon, nitrogen, mineral salts and biologically active compounds. The fermentation is preferably at 5 to 35 DEG C for 7 to 14 days.

Description

SPECIFICATION Bacterially produced animal feedstuff The present invention is concerned with a bacterially produced material which is useful as a feedstuff for animals (including poultry).

According to one aspect of the present invention, there is provided an animal feedstuff comprising a product having a pH of 4.0 to 5.0, a dry solids content of 20.9 to 37% by weight and a crude protein content of 5.8 to 8.8% by weight, the product being obtained by fermentation of a nutrient medium containing sources of carbohydrates, proteins, mineral salts, and manure or poultry droppings, using a bacterial leaven consisting of thermophilic bacteria of the genus Lactobacterium or Streptobacterium and mesophilic bacteria of the genus Streptococcus, Azotobacterium, Shermanni, Bacterium acidi propionicum, Escherichia colior Pseudomonas produced by way of a long-term symbiosis and adaptation of the bacteria to a nutrient medium containing sources of carbon, nitrogen, mineral salts and biologically active compounds.

Accordirig to another aspect of the present invention, there is provided a process of producing such an animal feedstuff, which comprises preconditioning a nutrient medium containing sources of carbon, nitrogen, mineral salts and manure of poultry droppings and fermentation of the nutrient medium by means of a bacterial leaven consisting of thermophilic bacteria of the genus Lactobacterium or Streptobacterium and mesophilic bacteria of the genus Streptococcus, Azotobacterium, Shermanni, Bacterium acidi propionicum, Escherichia coli or Pseudomonas produced by a long-term symbiosis and adaptation of the bacteria to a nutrient medium containing sources of carbon, nitrogen, mineral salts, and biologically active compounds, the fermentation process being conducted at 5 to 35"C for 7 to 1 4 days.

The feedstuff according to the invention is a brown pulpy mass with a slight acidic smell, contains no pathogenic bacteria and has good nutrient value.

In the process according to the invention, the bacterial leaven is preferably introduced into the nutrient medium in an amount of 0.1 to 2% by volume.

The nutrient medium used in the process according to the invention preferably comprises cheap sources of fats and proteins, such as offal, vegetable matter (such as vegetable flour, weed seeds or waste straw). The source of mineral salts is preferably slime (or silt) and the carbohydrate source is preferably molasses. As mentioned above, the nutrient medium also contains manure (such as pig manure) or poultry droppings; the manure or poultry droppings (which is preferably unseparated) may be present in an amount of up to 80% by weight of the nutrient medium.

A preferred nutrient medium, containing inexpensive readily available components, has the following composition, in percentage by weight: slime 2 to 12 molasses 8 to 1 2 plant roots with mycorhiza 0.2 to 2.0 vegetable flour or plant seeds 3.0 to 20.0 offal 1.0 to 2.0 manure or poultry droppings the balance In order to reduce the particle size of the feedstuff and activation of the nutrient medium, the components thereof are preferably disintegrated at a blow speed of 1 20 to 200 m/sec. before fermentation. This disintegration ensures a good uniformity of the mixture and activation thereof, breaking cells of vegetable and animal feedstock (including shells of weed seeds). The particulation of the starting ingredients also makes it possible to intensify the fermentation process and increase the efficiency thereof.

In order that the present invention may be more fully understood the following Examples, in which all percentages are by weight unless indicated to the contrary, are given by way of illustration only.

Example 1 A nutrient medium was prepared with the following composition: sea slime 10.0% molasses 8.0% milk whey 1.0% roots of birch and alder with mycorhiza 0.2% grass flour 6.0% barley flour 4.0% weed seeds 2.0% offal 2.0% pig manure 65.8% The mixture was disintegrated at a maximum blow speed of 1 70 m/sec; the mixture was then charged into a bath, and 1% by volume of a bacterial leaven was added. Fermentation was conducted in the temperature range of 14 to 25"C for 12 days.

The resulting feedstuff was a pulp-like brown mass with a specific slightly acidic smell; its pH was 4.5, the dry solids content was 25.5% and the crude protein content was 7.8%.

Example 2 A nutrient medium was prepared with the following composition: lake slime 12.0% molasses 10.0% roots of corn 0.8% vegetable flour (barley flour and weed seeds) 15.0% offal 1.0% pig manure 61.2% The mixture was disintegrated at a maximum blow speed of 1 30 m/sec; the mixture was then charged into a bath, and 0.2% by volume of a bacterial leaven was added with mixing.

Fermentation was conducted at a temperature within the range of 18 to 35"C for 10 days. The resulting feedstuff was in the form of a pulp-like brown mass with a specific slightly acidic scent; its pH was 4.0 the dry solids content was 22.8% and the crude protein content was 6.5%.

Example 3 A nutrient medium was prepared with the following composition: sea slime 5.0% molasses 1 0.0% birch roots with mycorhiza 2.0% milk whey 1.0% vegetable flour (grass flour and barley flour) 7.0% offal 1.0% pig manure 74.0% The process was conducted in a manner similar to that described in Example 1. The resulting feedstuff had a pH of 5.0, a dry solids content of 20.9% and a crude protein content of 5.8%.

Example 4 A nutrient medium was prepared with the following composition: sea slime 12.0% molasses 10.0% milk whey 3.0% grass flour (seeds of poppy, flax, melilot and weeds) 6.0% offal 2.0% (liver, heart, testes, stomachs, intestines) poultry droppings 63.0% The process was conducted in a manner similar to that described in Example 1 except that the bacterial leaven was introduced in the amount of 2% by volume, the disintregation was conducted at a blow speed of 200 m/sec; and fermentation was carried out at a temperature within the range of 10 to 25"C for 10 days.

The resulting feedstuff was a brown pulp-like mass of pH 4, 0, a dry solids content of 35%, and a crude protein content of 8.8%.

The feedstuff according to the present invention has been tested in a pig-breeding farm. The tests were performed with three groups of pigs, each consisting of 20 specimens (with an average weight of 75kg), the feed being given to the animals in a conventional manner. The daily feeding ration for the pigs of the first group included 30% by weight of the feedstuff according to the invention; the second group of animals were given a feeding ration containing 60% of the feedstuff according to the present invention and the third (control) group of animals were given a feeding ration containing no feedstuff according to the present invention. The experiment was conducted for three months.

During the whole period of the experiment the general heath of the animals was observed; individual weight gain of the animals was monitored every two weeks. The highest weight grain was obtained in the group which had been given 30% of feedstuff according to the invention.

The weight gain for the other two groups was 1 20 kg. After slaughter of the animals the taste of the meat was evaluated; the results being that animals fed on the feedstuff according to the invention tasted better than the control group animals.

Claims

1. An animal feedstuff comprising a product having a pH of 4.0 to 5.0, a dry solids content of 20.9 to 37% by weight and a crude protein content of 5.8 to 8.8% by weight, the product being obtained by fermentation of a nutrient medium containing sources of carbohydrates, proteins, mineral salts and manure or poultry droppings, using a bacterial leaven consisting of thermophilic bacteria of the genus Lactobacterium or Streptobacterium and mesophilic bacteria of the genus Streptococcus, Azotobacterium, Shermanni, Bacterium acidi propionicum, Escherichia colior Pseudomonas produced by way of a long-term symbiosis and adaptation of the bacteria to a nutrient medium containing sources of carbon, nitrogen, mineral salts and biologically active compounds.

2. A process of producing an animal feedstuff, which comprises preconditioning a nutrient medium containing sources of carbohydrates, proteins, mineral salts and manure or poultry droppings and fermentation of the nutrient medium by means of a bacterial leaven consisting of thermophilic bacteria of the genus Lactobacterium or Streptobacterium and mesophilic bacteria of the genus Streptococcus, Azotobacterium, Shermanni, Bacterium acidi propionicum, Escherichia colior Pseudomonas produced by a long-term symbiosis and adaptation of the bacteria to a nutrient medium containing sources of carbon, nitrogen, mineral salts and biologically active compounds, the fermentation process being conducted at 5 to 35"C for 7 to 14 days.

3. A process according to claim 2, in which the bacterial leaven is introduced in an amount of 0.1 to 2% by volume of the nutrient medium.

4. A process according to claim 2 or 3, in which the nutrient medium has the following composition, in percentage by weight: slime 2 to 12 molasses 8 to 1 2 plant roots with mycorhiza 0.2 to 2.0 milk whey 1.0 to 5.0 vegetable flour or plant seeds 3 to 10.0 offal 1.0 to 2.0 manure of poultry droppings the balance

5. A process according to any of claims 2 to 4, wherein the components of the nutrient medium are disintegrated at a blow speed of from 120 to 200 m/sec before fermentation.

6. A process of producing an animal feedstuff, substantially as herein described in any of Examples 1 to 4.