Under-forest antibiotic-free native chicken breeding method based on precise regulation and control of food and medicine homologous components

Abstract

The invention relates to the technical field of animal breeding, in particular to an under-forest antibiotic-free native chicken breeding method based on precise regulation and control of food and medicine homologous components, which comprises the following steps: selecting a broad-leaf mixed forest with the slope of less than or equal to 15 degrees, the pH value of 6.0-7.5, the organic matter of more than or equal to 1.5% and the annual sunshine of more than or equal to 1200 hours, dividing the broad-leaf mixed forest into three equal-area partitions, arranging a preservative bamboo isolation fence, and sowing allium macrostemon and houttuynia cordata, and performing sunshade net maintenance for 22 + / -3 days until the seedling height reaches the standard, and then performing rotation grazing and stocking. The method comprises the following steps: carrying out plant extract disinfection every day, carrying out padding micro-ecological fermentation treatment and carrying out hermetia illucens resource utilization. And the vegetation regeneration rate in the pasturing period is greater than or equal to 85%. The sick and weak chickens are fed with allium macrostemon-herba houttuyniae juice, the incidence rate of intestinal diseases is remarkably reduced, the technical pain point of traditional under-forest breeding is solved, meanwhile, a raw material replacement scheme, climate adaptation parameters and the variety adaptation range are expanded, and unification of ecological benefits, economic benefits and social benefits is achieved.

Description

Technical Field

[0001] This invention relates to the field of animal husbandry technology, and in particular to a method for raising antibiotic-free free-range chickens in forests based on precise regulation of food and medicine homologous components. Background Technology

[0002] Traditional free-range chicken farming in forests commonly suffers from problems such as antibiotic overuse, improper manure treatment leading to ecological damage, and crude feed formulation resulting in inconsistent product quality. Existing technologies include some attempts to add traditional Chinese medicine to improve the chickens' immunity, but the content and testing methods for their effective components are unclear, leading to inconsistent results. Other methods use chicken manure to raise black soldier flies, but lack sterilization steps, posing biosafety risks. Furthermore, existing technologies do not form a complete ecological closed loop of "farming-manure-resource utilization-farming," hindering large-scale promotion. In addition, existing technologies lack solutions for adjusting farming parameters during the high-humidity rainy season and do not provide clear compatibility data for various free-range chicken breeds, limiting the technology's cross-regional promotion. Summary of the Invention

[0003] The purpose of this invention is to provide a method for raising antibiotic-free free-range chickens in forests based on precise regulation of food and medicine homologous components. This method aims to solve the technical pain points of traditional forest-based farming, while expanding raw material alternatives, climate adaptation parameters, and breed compatibility ranges, thereby achieving a balance of ecological, economic, and social benefits.

[0004] To achieve the above objectives, this invention provides a method for raising antibiotic-free free-range chickens under forest cover based on precise regulation of food and medicinal homologous components. This method involves selecting broad-leaved mixed forests with a slope ≤15°, soil pH 6.0-7.5, organic matter content ≥1.5%, and annual sunshine duration ≥1200h. These forests are then divided into equal-area breeding zones using a three-zone equal division method. The area of ​​each zone is equal to the total number of free-range chickens divided by 20 chickens per acre. Each zone is then equipped with a 0.8m high, ≤2cm porous, anti-corrosion bamboo fence, buried at a depth ≥20cm underground. Sow 90±5 kg / mu of Allium macrostemon bulbs in the soil of each zone and bury them at a depth of 6±1 cm; sow 55±5 kg / mu of Houttuynia cordata rhizome segments in the soil of each zone and bury them at a depth of 4±1 cm; water until the soil moisture content is 65±5%, and set up a shade net with a shading rate of 30% for 22±3 days, until the Allium macrostemon seedlings are ≥12 cm tall and the Houttuynia cordata seedlings are ≥10 cm tall; Free-range chickens were released into Zone 1 at a density of 20±2 chickens / acre, with a release period of 30±2 days. During the release period, feed was supplemented daily according to the age of the chickens using different feed processing methods. The chickens' excrement remained on the surface of the soil under the forest, and through the synergistic action of the root secretions of Allium macrostemon and Houttuynia cordata and soil microorganisms, it was converted into organic fertilizer within 7-10 days. After the free-range period in Zone 1 is over, the chickens will be transferred to Zone 2, and Zone 1 will enter a rest period; this rotational grazing will be carried out in three zones, with a vegetation regeneration rate of ≥85% in the rest zones. The chicken house structure is used to control the internal temperature at 22±6℃ and humidity at 55±5%, with a ventilation frequency of ≥4 times / hour, and perches with a spacing of ≥30cm and a height of 50-80cm from the ground; a disinfection system is used to disinfect daily with a mixture of 0.4% Allium macrostemon extract and 0.2% Houttuynia cordata extract for 15±2 minutes, with a coverage rate of ≥98%; The bedding material in the chicken coop is changed every 7±1 days and mixed with chicken manure at a ratio of 1:2. A compound microecological agent is added, and the mixture is anaerobic fermented in a sealed environment at 25-30℃ for 5-7 days. The fermentation temperature is then raised to 55-60℃ and maintained for ≥24 hours to kill pathogenic bacteria and parasite eggs. The fermentation product is used to cultivate black soldier flies. The resulting insects are freeze-dried at -35℃ for 12 hours and then pulverized into feed ingredients. If the free-range chickens show metabolic abnormalities, feed them 50±5 mL / chicken of a decoction made from fresh Allium macrostemon and Houttuynia cordata for 4±1 consecutive days.

[0005] The raw material composition and quantitative range of effective ingredients in the feed for the corresponding age are as follows: The feed for chicks aged 1-4 weeks includes: 50% selenium-enriched sprouted wheat, with an organic selenium content of 0.18±0.02 mg / kg; 22% freeze-dried black soldier fly larvae, with a chitin content of 6.5±0.5%; 3% black soldier fly larvae molts, with a chitin content of 13.5±1.0%; 8% freeze-dried powder, with an allicin content of 0.25±0.03%; 5% chick-specific premix; 4% shell powder; 2% limestone powder; 5% wheat bran; and 1% freeze-dried houttuynia cordata powder, with a houttuynin content of 0.15±0.02%. The feed for medium-sized chickens aged 5-12 weeks includes: 50% selenium-enriched sprouted wheat, 22% freeze-dried black soldier fly prepupae with chitin content of 7.5±0.5%, 1% freeze-dried houttuynia cordata powder, and the remaining components are the same as those for chicks. The feed for chickens aged 13 weeks to market size includes: 50% selenium-enriched sprouted wheat, 22% freeze-dried adult black soldier flies with a chitin content of 8.5±0.5%, 2% freeze-dried houttuynia cordata powder with a houttuynin content of 0.15±0.02%, and the remaining components are the same as those for chicks.

[0006] The specific methods for processing different feeds each day are as follows: During the chick stage, the feed should be ground to 80±5 mesh, processed at a low temperature of 60℃, and fed 4 times a day at a rate of 7.5±1.5% of the chick's body weight, with a moisture content of 12±1%. For medium-sized chickens, grind the feed to 60 mesh to form 2.5±0.5mm pellets. Feed three times a day at a rate of 6.0±1.0% of body weight, with a hardness of 2.0±0.2 kg / cm².2 ; For adult chickens, grind the feed to 40 mesh to make 3.5±0.5mm pellets. Feed twice a day at a rate of 5.0±1.0% of body weight. The feed should be water resistant for ≥2 hours.

[0007] The freeze-dried powder is either freeze-dried Allium macrostemon powder or freeze-dried garlic powder.

[0008] The preparation process of the freeze-dried Allium macrostemon powder is as follows: collect the whole Allium macrostemon plant that has grown for 60±5 days, wash and cut it into sections of 2±0.5cm, freeze-dry it under vacuum at -35±5℃ and vacuum degree ≤10Pa for 12±2h, pulverize it to 70±10 mesh, and retain the allicin activity rate ≥85%.

[0009] The preparation process of the freeze-dried houttuynia cordata powder is as follows: collect the whole houttuynia cordata plant that has grown for 50±5 days, wash and cut it into sections of 2±0.5cm, freeze-dry it under vacuum at -30±5℃ and vacuum degree ≤10Pa for 10±2h, and pulverize it to 70±10 mesh. The houttuynia cordata activity retention rate is ≥80%.

[0010] The preparation process of the selenium-enriched germinated wheat is as follows: wheat seeds with a bulk density ≥780g / L are selected, soaked in 0.08±0.01% sodium selenite solution for 7±1h, germinated at 22±2℃ and relative humidity 85±5% until the sprout length is 0.8±0.2cm, dried at 45±5℃ until the moisture content is ≤12%, and the organic selenium conversion rate is ≥80%.

[0011] In particular, during the rainy season, the ventilation frequency of the chicken coop was increased to 6 times per hour, and the litter replacement cycle was shortened to 5 days.

[0012] The compound microecological agent consists of lactic acid bacteria, yeast and Bacillus, with a ratio of 2:1:1 and an inoculation amount of 0.5%.

[0013] The viable count of the composite microbial agent is ≥1×10⁻⁶. 9 CFU / g, the pH value of the fermented manure is 6.5-7.0, and the organic matter content is ≥35%.

[0014] The method for raising antibiotic-free free-range chickens under forest cover based on precise regulation of food and medicinal homologous components of the present invention has the following advantages: Precisely quantify the content range of allicin, houttuynia cordata, chitin, and organic selenium in food and medicine homologous feed, clarify the detection methods, and achieve controllable breeding effects; at the same time, provide raw material alternatives to reduce the risk of raw material procurement. The design employs a dual-pathway treatment model, combining the degradation of forest manure into organic fertilizer and the fermentation of chicken manure to raise black soldier flies, to achieve zero discharge of manure. Simultaneously, it provides alternative parameters for the fermentation process, enhancing its flexibility. The technology employs low-temperature powdering and vacuum freeze-drying processes to protect heat-sensitive components, and is equipped with antibiotic-free chicken houses and disinfection systems to ensure that no antibiotics are used throughout the entire breeding process; additional parameter adjustment schemes for high-humidity environments are provided to enhance the regional adaptability of the technology. Clarify the compatibility data for various native chicken breeds, expand the scope of application of the technology, and enhance its commercial promotion value. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart of the method for raising antibiotic-free free-range chickens in forests based on the precise regulation of food and medicine homologous components, as described in this invention. Detailed Implementation

[0017] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0018] Please see Figure 1 This invention provides a method for raising antibiotic-free free-range chickens in forests based on precise regulation of food and medicinal homologous components, comprising: S101 selects broad-leaved mixed forests with a slope of ≤15°, soil pH of 6.0-7.5, organic matter content of ≥1.5%, and annual sunshine duration of ≥1200h. It is divided into breeding zones with equal area according to the three-zone equal division method. The area of ​​each zone is equal to the total number of native chickens divided by 20 chickens / mu. The zones are equipped with anti-corrosion bamboo fences with a height of 0.8m and a pore size of ≤2cm. The fences are buried in the ground to a depth of ≥20cm. S102 Sow 90±5 kg / mu of Allium macrostemon bulbs into the soil of each zone, burying them at a depth of 6±1 cm; Sow 55±5 kg / mu of Houttuynia cordata rhizome segments into the soil of each zone, burying them at a depth of 4±1 cm; Water until the soil moisture content is 65±5%, and build a shade net with a shading rate of 30% for 22±3 days, until the Allium macrostemon seedlings are ≥12 cm tall and the Houttuynia cordata seedlings are ≥10 cm tall; S103 released free-range chickens into Zone 1 at a density of 20±2 chickens / mu, with a release period of 30±2 days. During the release period, feed was supplemented daily according to different feed processing methods for the chickens' age. The chickens' excrement remained on the surface of the forest soil and was converted into organic fertilizer within 7-10 days through the synergistic action of the root secretions of Allium macrostemon and Houttuynia cordata and soil microorganisms. The raw material composition and quantitative range of effective ingredients in the feed for the corresponding age are as follows: The feed for chicks aged 1-4 weeks includes: 50% selenium-enriched sprouted wheat, with an organic selenium content of 0.18±0.02 mg / kg; 22% freeze-dried black soldier fly larvae, with a chitin content of 6.5±0.5%; 3% black soldier fly larvae molts, with a chitin content of 13.5±1.0%; 8% freeze-dried powder, with an allicin content of 0.25±0.03%; 5% chick-specific premix; 4% shell powder; 2% limestone powder; 5% wheat bran; and 1% freeze-dried houttuynia cordata powder, with a houttuynin content of 0.15±0.02%. The feed for medium-sized chickens aged 5-12 weeks includes: 50% selenium-enriched sprouted wheat, 22% freeze-dried black soldier fly prepupae with chitin content of 7.5±0.5%, 1% freeze-dried houttuynia cordata powder, and the remaining components are the same as those for chicks. The feed for chickens aged 13 weeks to market size includes: 50% selenium-enriched sprouted wheat, 22% freeze-dried adult black soldier flies with a chitin content of 8.5±0.5%, 2% freeze-dried houttuynia cordata powder with a houttuynin content of 0.15±0.02%, and the remaining components are the same as those for chicks.

[0019] The specific methods of daily feed processing are as follows: During the chick stage, the feed should be ground to 80±5 mesh, processed at a low temperature of 60℃, and fed 4 times a day at a rate of 7.5±1.5% of the chick's body weight, with a moisture content of 12±1%. For medium-sized chickens, grind the feed to 60 mesh to form 2.5±0.5mm pellets. Feed three times a day at a rate of 6.0±1.0% of body weight, with a hardness of 2.0±0.2 kg / cm². 2 ; For adult chickens, grind the feed to 40 mesh to make 3.5±0.5mm pellets. Feed twice a day at a rate of 5.0±1.0% of body weight. The feed should be water resistant for ≥2 hours.

[0020] The freeze-dried powder is either freeze-dried Allium macrostemon powder or freeze-dried garlic powder.

[0021] The preparation process of the freeze-dried Allium macrostemon powder is as follows: collect the whole Allium macrostemon plant that has grown for 60±5 days, wash and cut it into sections of 2±0.5cm, freeze-dry it under vacuum at -35±5℃ and vacuum degree ≤10Pa for 12±2h, and pulverize it to 70±10 mesh. The allicin activity retention rate is ≥85%.

[0022] The preparation process of the freeze-dried houttuynia cordata powder is as follows: collect the whole houttuynia cordata plant that has grown for 50±5 days, wash and cut it into sections of 2±0.5cm, freeze-dry it under vacuum at -30±5℃ and vacuum degree ≤10Pa for 10±2h, and pulverize it to 70±10 mesh. The houttuynia cordata activity retention rate is ≥80%.

[0023] The preparation process of the selenium-enriched germinated wheat is as follows: wheat seeds with a bulk density ≥780g / L are selected, soaked in 0.08±0.01% sodium selenite solution for 7±1h, germinated at 22±2℃ and relative humidity 85±5% until the sprout length is 0.8±0.2cm, dried at 45±5℃ until the moisture content is ≤12%, and the organic selenium conversion rate is ≥80%.

[0024] After the free-range period in Zone 1 of S104 ends, the chickens will be transferred to Zone 2, and Zone 1 will enter a rest period; this rotational grazing will be carried out in three zones, with a vegetation regeneration rate of ≥85% in the rest zones. S105 chicken houses are designed to control the internal temperature at 22±6℃ and humidity at 55±5%, with a ventilation frequency of ≥4 times / hour, perch spacing of ≥30cm, and a height of 50-80cm from the ground. A disinfection system is used daily to disinfect with a mixture of 0.4% Allium macrostemon extract and 0.2% Houttuynia cordata extract for 15±2 minutes, achieving a coverage rate of ≥98%. In response to the rainy season, the ventilation frequency of the chicken coop was increased to 6 times per hour, and the litter replacement cycle was shortened to 5 days.

[0025] The bedding material in the S106 chicken house is changed every 7±1 days, mixed with chicken manure at a ratio of 1:2, and inoculated with compound microecological agents. It is then anaerobically fermented in a sealed environment at 25-30℃ for 5-7 days. The fermentation temperature is raised to 55-60℃ and maintained for ≥24 hours to kill pathogenic bacteria and parasite eggs. The fermentation product is used to cultivate black soldier flies. The obtained insect bodies are freeze-dried at -35℃ for 12 hours and then crushed into feed raw materials. The compound microecological agent consists of lactic acid bacteria, yeast and Bacillus, with a ratio of 2:1:1 and an inoculation amount of 0.5%.

[0026] The viable count of the compound microecological agent is ≥1×10⁻⁶. 9 CFU / g, the pH value of the fermented manure is 6.5-7.0, and the organic matter content is ≥35%.

[0027] If S107 chickens show metabolic abnormalities, feed them 50±5 mL / chicken of a decoction made from fresh Allium macrostemon and Houttuynia cordata for 4±1 consecutive days.

[0028] A broad-leaved mixed forest in Yichun, Jiangxi Province, with a slope of 10°, soil pH of 6.8, organic matter content of 1.8%, and annual sunshine duration of 1400 hours, was selected and divided into three equal breeding zones, each with an area of ​​10 mu (approximately 0.67 hectares). Anti-corrosion bamboo fences with a height of 0.8m and a perforation of 2cm were erected and buried 20cm underground. 90kg / mu (approximately 4.5kg / mu) of Allium macrostemon bulbs were sown and buried 6cm deep; 55kg / mu (approximately 3.75kg / mu) of Houttuynia cordata rhizome segments were sown and buried 4cm deep. The soil was watered until the moisture content reached 65%, and a shade net with a 30% shading rate was erected. After 22 days of cultivation, when the Allium macrostemon seedlings reached 12cm in height and the Houttuynia cordata seedlings reached 10cm in height, Sanhuang chicken chicks were introduced.

[0029] If the breeding area is in the rainy season, the ventilation frequency of the chicken house should be increased to 6 times / hour, and the litter replacement cycle should be shortened to 5 days to avoid excessive humidity and mold growth in the chicken house.

[0030] Chicks are released at a density of 20 birds per acre, and each section is grazed for 30 days before being rotated to the next section. At 4:00 PM daily, chicks are fed a feed containing both food and medicinal ingredients, at a rate of 7.5% of their body weight. Chicken manure under the trees decomposes into organic fertilizer within 7 days, which in turn nourishes the growth of Allium macrostemon and Houttuynia cordata.

[0031] Multi-breed adaptation verification: 500 chicks each of Dongxiang Black Chicken and Ningdu Yellow Chicken were introduced and the same breeding parameters were used. The final survival rate of Dongxiang Black Chicken was 96.8% and that of Ningdu Yellow Chicken was 97.2%, both of which were better than the traditional breeding model.

[0032] Option 1: Conventional Fermentation: Chicken coop bedding is mixed with rice husks and sawdust in a 3:1 ratio, changed every 7 days, and then mixed with chicken manure at a 1:2 ratio. A compound microbial agent (1×10⁶ live bacteria) is then added. 9 (CFU / g), anaerobic fermentation at 28℃ for 6 days, with a peak fermentation temperature of 60℃ maintained for 24 hours, resulting in a pathogenic bacteria kill rate of 99.5%.

[0033] Option 2: Low-temperature fermentation as an alternative: The fermentation temperature is adjusted to 52℃, the fermentation cycle is extended to 9 days, and the pathogenic bacteria kill rate is 99.2% after fermentation. This option is suitable for farms that are equipped with low-temperature fermentation equipment.

[0034] Fermentation products were used to cultivate black soldier flies, with a larval conversion rate of 28% and a chitin content of 6.8% after freeze-drying.

[0035] Option 1: Standard formula: Mix freeze-dried black soldier fly larvae, selenium-enriched sprouted wheat, freeze-dried Allium macrostemon powder, freeze-dried Houttuynia cordata powder and other raw materials according to the formula. For chicks, grind the raw materials to 80 mesh and grind them at a low temperature of 60℃. The feed moisture content is 12%.

[0036] Option 2: Raw material substitution formula: Replace freeze-dried Allium macrostemon powder with freeze-dried garlic powder, with allicin content controlled at 0.22%. After feeding, the incidence of intestinal diseases in native chickens was 1.3%, which is equivalent to the control effect of conventional formula.

[0037] Freeze-drying process alternative: Using parameters of -25℃ vacuum freeze-drying for 15 hours, the allicin activity retention rate in feed is 79%, and the houttuynia cordata activity retention rate is 78%, meeting the needs of aquaculture.

[0038] Disinfect the chicken coop daily at 19:00 with a solution of 0.4% Allium macrostemon extract and 0.2% Houttuynia cordata extract for 15 minutes, achieving a coverage rate of 98%. When the feed intake of the free-range chickens decreased by more than 20%, isolate them and feed them 50mL of Allium macrostemon and Houttuynia cordata juice per chicken for 4 consecutive days, with an effective treatment rate of 90%.

[0039] The experimental data for verifying the technical effects are shown in Table 1: Table 1 In terms of the health of free-range chickens, intestinal diseases mainly refer to symptoms such as diarrhea, loose / bloody feces, lethargy, and decreased feed intake caused by Escherichia coli, Salmonella, Clostridium perfringens, etc.

[0040] The criteria for judgment include daily inspections to record individuals exhibiting typical intestinal disease symptoms; and autopsies of deceased or suspected cases to observe pathological changes such as intestinal congestion, bleeding, and abnormal contents. The formula for calculating the incidence rate is: Intestinal disease incidence rate (%) = Number of affected chickens / Total number of chickens in the group × 100% "Number of sick chickens" refers to the number of individuals meeting the above diagnostic criteria throughout the entire rearing cycle (multiple occurrences of the same chicken are counted only once). The results are shown in Table 2: Table 2 The above description discloses only one preferred embodiment of the present invention, and should not be construed as limiting the scope of the present invention. Those skilled in the art will understand that all or part of the processes of the above embodiments can be implemented, and equivalent changes made in accordance with the claims of the present invention are still within the scope of the invention.

Claims

1. A method for raising antibiotic-free free-range chickens in forests based on precise regulation of food and medicinal homologous components. Its features are, include: Broadleaf mixed forests with a slope of ≤15°, soil pH of 6.0–7.5, organic matter content of ≥1.5%, and annual sunshine duration of ≥1200h were selected and divided into breeding zones with equal area according to the three-zone equal division method. The area of ​​each zone is equal to the total number of native chickens divided by 20 chickens / mu. Each section is equipped with a 0.8m high, ≤2cm gap, anti-corrosion bamboo barrier, and the barrier is buried ≥20cm underground. Sow 90±5 kg / mu of Allium macrostemon bulbs in the soil of each zone and bury them at a depth of 6±1 cm; sow 55±5 kg / mu of Houttuynia cordata rhizome segments in the soil of each zone and bury them at a depth of 4±1 cm; water until the soil moisture content is 65±5%, and set up a shade net with a shading rate of 30% for 22±3 days, until the Allium macrostemon seedlings are ≥12 cm tall and the Houttuynia cordata seedlings are ≥10 cm tall; Free-range chickens were released into Zone 1 at a density of 20±2 chickens / acre, with a release period of 30±2 days. During the release period, feed was supplemented daily according to different feed processing methods for the chickens of the appropriate age. The chickens' excrement remained on the surface of the soil under the forest and was converted into organic fertilizer within 7–10 days through the synergistic action of the root secretions of Allium macrostemon and Houttuynia cordata and soil microorganisms. After the free-range period in Zone 1 is over, the chickens will be transferred to Zone 2, and Zone 1 will enter a rest period; this rotational grazing will be carried out in three zones, with a vegetation regeneration rate of ≥85% in the rest zones. The chicken house structure is used to control the internal temperature at 22±6℃ and humidity at 55±5%, with a ventilation frequency of ≥4 times / hour, and perch spacing of ≥30cm and ground height of 50–80cm. The disinfection system uses a mixture of 0.4% Allium macrostemon extract and 0.2% Houttuynia cordata extract for 15±2 minutes daily, with a coverage rate of ≥98%. The bedding material in the chicken house is changed every 7±1 days and mixed with chicken manure at a ratio of 1:

2. A compound microecological agent is added, and the mixture is anaerobic fermented in a sealed environment at 25–30℃ for 5–7 days. The fermentation temperature is then raised to 55–60℃ and maintained for ≥24 hours to kill pathogenic bacteria and parasite eggs. The fermentation product is used to cultivate black soldier flies. The resulting insects are freeze-dried at -35℃ for 12 hours and then pulverized into feed ingredients. If the free-range chickens show metabolic abnormalities, feed them 50±5 mL / chicken of a decoction made from fresh Allium macrostemon and Houttuynia cordata for 4±1 consecutive days.

2. The method for raising antibiotic-free free-range chickens under forest cover based on precise regulation of food and medicinal homologous components as described in claim 1, characterized in that, The raw material composition and quantitative range of effective ingredients in the feed for the corresponding age are as follows: The feed for chicks aged 1-4 weeks includes: 50% selenium-enriched sprouted wheat, with an organic selenium content of 0.18±0.02 mg / kg; 22% freeze-dried black soldier fly larvae, with a chitin content of 6.5±0.5%; 3% black soldier fly larvae molts, with a chitin content of 13.5±1.0%; 8% freeze-dried powder, with an allicin content of 0.25±0.03%; 5% chick-specific premix; 4% shell powder; 2% limestone powder; 5% wheat bran; and 1% freeze-dried houttuynia cordata powder, with a houttuynin content of 0.15±0.02%. The feed for medium-sized chickens aged 5–12 weeks includes: 50% selenium-enriched sprouted wheat, 22% freeze-dried black soldier fly prepupae with chitin content of 7.5±0.5%, 1% freeze-dried houttuynia cordata powder, and the remaining components are the same as those for chicks. The feed for chickens aged 13 weeks to market size includes: 50% selenium-enriched sprouted wheat, 22% freeze-dried adult black soldier flies with a chitin content of 8.5±0.5%, 2% freeze-dried houttuynia cordata powder with a houttuynin content of 0.15±0.02%, and the remaining components are the same as those for chicks.

3. The method for raising antibiotic-free free-range chickens under forest cover based on precise regulation of food and medicinal homologous components as described in claim 2, characterized in that, The specific methods of daily feed processing are as follows: During the chick stage, the feed should be ground to 80±5 mesh, processed at a low temperature of 60℃, and fed 4 times a day at a rate of 7.5±1.5% of the chick's body weight, with a moisture content of 12±1%. The middle chicken stage is ground to 60 mesh, and made into 2.5±0.5 mm pellet, which is fed 3 times a day, with a feeding amount of 6.0±1.0% of body weight, and a hardness of 2.0±0.2 kg / cm 2 ; For adult chickens, grind the feed to 40 mesh to make 3.5±0.5mm pellets. Feed twice a day at a rate of 5.0±1.0% of body weight. The feed should be water resistant for ≥2 hours.

4. The method for raising antibiotic-free free-range chickens under forest cover based on precise regulation of food and medicinal homologous components as described in claim 2, characterized in that, The freeze-dried powder is either freeze-dried Allium macrostemon powder or freeze-dried garlic powder.

5. The method for raising antibiotic-free free-range chickens under forest cover based on precise regulation of food and medicinal homologous components as described in claim 4, characterized in that, The preparation process of the freeze-dried Allium macrostemon powder is as follows: collect the whole Allium macrostemon plant that has grown for 60±5 days, wash and cut it into sections of 2±0.5cm, freeze-dry it under vacuum at -35±5℃ and vacuum degree ≤10Pa for 12±2h, and pulverize it to 70±10 mesh. The allicin activity retention rate is ≥85%.

6. The method for raising antibiotic-free free-range chickens under forest cover based on precise regulation of food and medicinal homologous components as described in claim 2, characterized in that, The preparation process of the freeze-dried houttuynia cordata powder is as follows: collect the whole houttuynia cordata plant that has grown for 50±5 days, wash and cut it into sections of 2±0.5cm, freeze-dry it under vacuum at -30±5℃ and vacuum degree ≤10Pa for 10±2h, and pulverize it to 70±10 mesh. The houttuynia cordata activity retention rate is ≥80%.

7. The method for raising antibiotic-free free-range chickens under forest cover based on precise regulation of food and medicinal homologous components as described in claim 2, characterized in that, The preparation process of the selenium-enriched germinated wheat is as follows: wheat seeds with a bulk density ≥780g / L are selected, soaked in 0.08±0.01% sodium selenite solution for 7±1h, germinated at 22±2℃ and relative humidity 85±5% until the sprout length is 0.8±0.2cm, dried at 45±5℃ until the moisture content is ≤12%, and the organic selenium conversion rate is ≥80%.

8. The method for raising antibiotic-free free-range chickens under forest cover based on precise regulation of food and medicinal homologous components as described in claim 1, characterized in that, In response to the rainy season, the ventilation frequency of the chicken coop was increased to 6 times per hour, and the litter replacement cycle was shortened to 5 days.

9. The method for raising antibiotic-free free-range chickens under forest cover based on precise regulation of food and medicinal homologous components as described in claim 1, characterized in that, The compound microecological agent consists of lactic acid bacteria, yeast and Bacillus, with a ratio of 2:1:1 and an inoculation amount of 0.5%.

10. The method for raising antibiotic-free free-range chickens under forest cover based on precise regulation of food and medicinal homologous components as described in claim 9, characterized in that, The viable bacteria number of the complex microecological agent is ≥1×10 9 CFU / g, the pH value of the fermented fecal sewage is 6.5-7.0, and the organic matter content is ≥35%.

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