CN110973387B

CN110973387B - Environment-friendly and emission-reducing piglet feed without adding exogenous trace elements and application thereof

Info

Publication number: CN110973387B
Application number: CN201911342506.XA
Authority: CN
Inventors: 杨小军; 虎千力; 张文晔; 王汉星
Original assignee: Northwest A&F University
Current assignee: Northwest A&F University
Priority date: 2019-12-23
Filing date: 2019-12-23
Publication date: 2022-11-25
Anticipated expiration: 2039-12-23
Also published as: CN110973387A

Abstract

The invention provides an environment-friendly and emission-reducing piglet feed without adding exogenous trace elements and application thereof, belonging to the technical field of feeds. According to the invention, the feed raw materials are reasonably optimized, so that the normal growth and development requirements of piglets can be met only by utilizing the trace elements in the feed raw materials, the trace element waste is reduced, and the environmental pollution caused by the trace elements due to the discharge of excrement in the piglet production is reduced. The feed disclosed by the invention is very simple in production and application, low in cost, capable of maintaining good growth performance of pigs, saving resources, protecting the environment and wide in value. Has important significance in the aspects of resource conservation and environmental protection of trace elements of copper, iron, zinc and manganese.

Description

Environment-friendly and emission-reducing piglet feed without adding exogenous trace elements and application thereof

Technical Field

The invention belongs to the technical field of feeds, and particularly relates to an environment-friendly emission-reducing piglet feed without adding exogenous trace elements and application thereof.

Background

The information in this background section is only for enhancement of understanding of the general background of the invention and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.

The feed used in the production of intensive culture enterprises is added with high-dose microelement premix, however, the growth performance is not obviously improved by adding partial microelements, the bioavailability of the microelements is low, and most of the added microelements are not absorbed by organisms and are discharged out of the bodies. Some feeds are subjected to measures for reducing the addition of trace elements, but the addition amount of the trace elements is still high relative to the industry standard (the agricultural industry standard of the people's republic of China-pig feeding standard _ NY _ T65_ 2004) or other national standards (NRC pig nutrition standard 2012, danish pig nutrition standard 2018).

In order to solve the problems, some organic trace element products in the conventional feed replace inorganic salt trace elements to be added, but the effects are different, and the inventor finds that the organic trace elements are high in cost, the industrial quality standards are not unified, the product quality cannot be guaranteed, and the organic trace element products cannot be used in animal husbandry production in a large range.

Disclosure of Invention

Aiming at the prior art, through long-term technical and practical exploration, the invention provides the environment-friendly emission-reducing piglet feed without adding exogenous trace elements and the application thereof.

The invention is realized by the following technical scheme:

the invention provides a piglet feed without adding exogenous trace elements, which consists of two stages of feeds, namely a stage-one feed (suitable for being 56-69 days old) and a stage-two feed (suitable for being 70-83 days old), wherein the feeds consist of the following raw materials in percentage by weight:

stage one feed (56-69 days old): 61-62% of corn, 13-14% of 46% of soybean meal, 4-5% of wheat middling, 5-6% of whey powder, 2-3% of 50% of fermented soybean meal, 2-3% of fish meal, 0.5-1% of stone powder, 0.5-1% of monocalcium phosphate, 0.1-0.2% of salt, 7-8% of premix, 0.1-0.2% of DL-methionine, 0.4-0.6% of L-lysine hydrochloride and 0.01-0.02% of choline chloride;

stage two feed (70-83 days old): 63 to 64 percent of corn, 18 to 20 percent of 46 percent of soybean meal, 3 to 5 percent of wheat middling, 2 to 3 percent of DDGS, 2 to 3 percent of 50 percent of fermented soybean meal, 2 to 4 percent of fish meal, 0.5 to 0.8 percent of stone powder, 0.6 to 0.8 percent of monocalcium phosphate, 0.5 to 0.8 percent of salt, 4 to 5 percent of premix, 0.1 to 0.2 percent of DL-methionine, 0.6 to 0.8 percent of L-lysine hydrochloride and 0.01 to 0.02 percent of choline chloride.

Wherein the premix comprises vitamin premix feed and L-lysine hydrochloride;

the vitamin premixed feed comprises vitamin A and vitamin D ₃ Vitamin E, vitamin K ₃ Vitamin B ₁ Vitamin B ₂ And vitamin B ₆ 。

More preferably, the stage-one premix has the following composition:

more preferably, the phase two premix has the following components:

the premix also comprises a flavoring agent, an antioxidant and a carrier; the carrier comprises medical stone for feed and rice hull powder.

Furthermore, the stage one feed and the stage two feed consist of the following raw materials in percentage by weight:

stage one feed (56-69 days old): 61.74 percent of corn, 13.64 percent of 46 percent of soybean meal, 5.00 percent of wheat middling, 5.00 percent of whey powder, 2.50 percent of 50 percent of fermented soybean meal, 2.50 percent of fish meal, 0.79 percent of stone powder, 0.62 percent of monocalcium phosphate, 0.10 percent of salt, 7.38 percent of premix, 0.19 percent of DL-methionine, 0.53 percent of L-lysine hydrochloride and 0.01 percent of choline chloride.

Stage two feed (70-83 days old): 63.53% of corn, 18.00% of 46% of soybean meal, 3.30% of wheat middling, 2.50% of DDGS, 2.50% of 50% of fermented soybean meal, 2.50% of fish meal, 0.79% of stone powder, 0.63% of monocalcium phosphate, 0.50% of salt, 4.92% of premix, 0.18% of DL-methionine, 0.64% of L-lysine hydrochloride and 0.01% of choline chloride.

According to a second aspect of the invention, a preparation method of the piglet feed is provided, and the preparation method comprises the step of mixing the raw materials in percentage by weight.

In a third aspect of the invention, the piglet feed is applied to piglet feeding.

In a fourth aspect of the present invention, there is provided a feeding method for piglets, comprising: the piglet is fed by adopting the feed.

Preferably, 56-69 days old piglets are fed with the stage one feed;

preferably, the stage two feed is fed to piglets of 70-83 days old.

In a fifth aspect of the present invention, there is provided an application of the above piglet feed and/or piglet feeding method, wherein the application comprises:

1) The growth performance of the piglets is maintained, and the subsequent growth of the pigs is not negatively influenced;

2) Reduce the discharge of trace elements in the pig manure.

The piglet feed is not limited to piglets of 56-83 days old in the using stage, and can be used in the subsequent growth and development stage of fattening pigs.

The invention has the beneficial effects that: the invention provides an environment-friendly emission-reducing piglet feed without adding exogenous trace elements for the first time. The feed disclosed by the invention is very simple to produce and apply, low in cost, capable of maintaining good growth performance of pigs, saving resources, protecting the environment and wide in value. Especially has important significance in the aspects of trace element copper, iron, zinc and manganese resource saving and environmental protection, thereby having good practical application value.

Detailed Description

It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise. It is to be understood that the scope of the invention is not to be limited to the specific embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention.

The present invention is further illustrated by reference to specific examples, which are intended to be illustrative only and not limiting. If the experimental conditions not specified in the examples are specified, the conditions are generally as usual or as recommended by the reagents company; reagents, consumables and the like used in the following examples are commercially available unless otherwise specified.

As mentioned above, the feed used in the intensive cultivation enterprises is added with high-dose premix of trace elements, and the bioavailability of the trace elements is low, which results in that most of the added trace elements are not absorbed by the organism and are discharged out of the body. Some feeds are subjected to measures for reducing the addition of trace elements, but the addition amount of the trace elements is still high relative to the industry standard (the agricultural industry standard of the people's republic of China-pig feeding standard _ NY _ T65_ 2004) or other national standards (NRC pig nutrition standard 2012, danish pig nutrition standard 2018). Some feed raw materials inherently contain a certain amount of trace elements, and the content of the trace elements in the feed raw materials is not considered in the prior feed.

In view of the above, compared with the basic feed without adding exogenous trace elements according to the industrial standard, the danish standard and the commercial feed, the basic feed without adding exogenous trace elements is designed for the piglets of 15-30kg, and the growth performance of each treatment group has no obvious difference, and the diarrhea rate and the death and culling rate have no obvious difference. The basic feed meets the growth requirement of 15-30kg piglets, saves resources and protects the environment.

In a specific embodiment of the invention, the invention provides an environment-friendly emission-reducing piglet feed without adding exogenous trace elements, wherein the daily feed consists of two stages of feeds, namely a stage one (suitable for 56-69 days old) and a stage two (suitable for 70-83 days old), and the feeds consist of the following raw materials in percentage by weight:

stage one (56-69 days old): 61.74 percent of corn, 13.64 percent of 46 percent of soybean meal, 5.00 percent of wheat middling, 5.00 percent of whey powder, 2.50 percent of 50 percent of fermented soybean meal, 2.50 percent of fish meal, 0.79 percent of stone powder, 0.62 percent of monocalcium phosphate, 0.10 percent of salt, 7.38 percent of premix, 0.19 percent of DL-methionine, 0.53 percent of L-lysine hydrochloride and 0.01 percent of choline chloride.

Stage two (70-83 days old): 63.53% of corn, 18.00% of 46% of soybean meal, 3.30% of wheat middling, 2.50% of DDGS, 2.50% of 50% of fermented soybean meal, 2.50% of fish meal, 0.79% of stone powder, 0.63% of monocalcium phosphate, 0.50% of salt, 4.92% of premix, 0.18% of DL-methionine, 0.64% of L-lysine hydrochloride and 0.01% of choline chloride.

The basal diet composition and nutritional levels are shown in table 1.

TABLE 1 basal diet composition and nutritional level ¹ (air drying foundation)

¹ The contents of copper, iron, zinc and manganese are measured values of atomic absorption, and the rest are calculated values.

The premix 2 is shown in tables 5 and 6.

The microelement premix for the piglet diet comprises feed-grade copper sulfate, feed-grade ferrous sulfate, feed-grade zinc sulfate, feed-grade manganese sulfate, a carrier (rice hull powder for feed) and a diluent (medical stone/bentonite for feed) shown in Table 2.

TABLE 2 concentrations of copper, iron, zinc and manganese added to the diet (mg/kg)

The invention is further illustrated by the following examples, which are not to be construed as limiting the invention thereto. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

Example 1

In 12 months in 2018, piglet breeding tests are carried out in a pig farm in the great county of Weinan city, shanxi province, the test daily ration adopts piglet daily rations with trace elements in different modes, 400 PIC commercial pigs with 56 days of age, good body conditions and healthy and disease-free pigs are selected, and the average weight of the PIC commercial pigs is 13.01 +/-0.36 Kg and is shown in Table 3. The test pigs were divided into 4 treatments, each treatment was repeated for 5 times, each treatment was repeated for 20 times, the test was divided into 2 stages, each stage was based on the treatment of piglet diets fed with different types of trace elements, the treatment groups are shown in table 4.

TABLE 1 test of pig weight (kg)

Table 4 experimental design

Remarking: the copper, iron, zinc and manganese additives are all in the form of sulfate.

The specific components of the compound premix for the first-stage piglets are shown in table 5.

TABLE 5 ingredient list of compound premix feed for first-stage piglets

[ notes ] the raw materials consist of: vitamin premix feed, L-lysine hydrochloride, flavoring agent, antioxidant, and carrier (Maifanitum and rice hull powder for feed).

The specific components of the compound premix for the second-stage piglets are shown in Table 6.

TABLE 6 ingredient list of compound premix feed for second piglet at stage

Stage one example 1

The formula is as follows: 61.74 percent of corn, 13.64 percent of 46 percent of soybean meal, 5.00 percent of wheat middling, 5.00 percent of whey powder, 2.50 percent of 50 percent of fermented soybean meal, 2.50 percent of fish meal, 0.79 percent of stone powder, 0.62 percent of monocalcium phosphate, 0.10 percent of salt, 7.38 percent of premix, 0.19 percent of DL-methionine, 0.53 percent of L-lysine hydrochloride, 0.01 percent of choline chloride and no additional exogenous trace elements.

Phase one example 2

The formula is as follows: 61.74 percent of corn, 13.64 percent of 46 percent of soybean meal, 5.00 percent of wheat middling, 5.00 percent of whey powder, 2.50 percent of 50 percent of fermented soybean meal, 2.50 percent of fish meal, 0.79 percent of stone powder, 0.62 percent of dicalcium phosphate, 0.10 percent of salt, 7.38 percent of premix, 0.19 percent of DL-methionine, 0.53 percent of L-lysine hydrochloride, 0.01 percent of choline chloride, 4.59mg/kg of extra trace elements copper, 90.90mg/kg of iron and 105.30mg/kg of zinc.

Phase one example 3

The formula is as follows: 61.74 percent of corn, 13.64 percent of 46 percent of soybean meal, 5.00 percent of wheat middling, 5.00 percent of whey powder, 2.50 percent of 50 percent of fermented soybean meal, 2.50 percent of fish meal, 0.79 percent of stone powder, 0.62 percent of dicalcium phosphate, 0.10 percent of salt, 7.38 percent of premix, 0.19 percent of DL-methionine, 0.53 percent of L-lysine hydrochloride, 0.01 percent of choline chloride, 4.59mg/kg of extra trace elements copper, 135.90mg/kg of iron, 95.30mg/kg of zinc and 36.00mg/kg of manganese.

Phase one example 4

The formula is as follows: 61.74 percent of corn, 13.64 percent of 46 percent of soybean meal, 5.00 percent of wheat middling, 5.00 percent of whey powder, 2.50 percent of 50 percent of fermented soybean meal, 2.50 percent of fish meal, 0.79 percent of stone powder, 0.62 percent of dicalcium phosphate, 0.10 percent of salt, 7.38 percent of premix, 0.19 percent of DL-methionine, 0.53 percent of L-lysine hydrochloride, 0.01 percent of choline chloride, 109.59mg/kg of extra trace elements of copper, 159.90mg/kg of iron, 105.30mg/kg of zinc and 63.00mg/kg of manganese.

Stage two example 1

The formula is as follows: 63.53% of corn, 18.00% of 46% soybean meal, 3.30% of wheat middling, 2.50% of DDGS, 2.50% of 50% fermented soybean meal, 2.50% of fish meal, 0.79% of stone powder, 0.63% of monocalcium phosphate, 0.50% of salt, 4.92% of premix, 0.18% of DL-methionine, 0.64% of L-lysine hydrochloride, 0.01% of choline chloride and no additional exogenous trace elements.

Phase two example 2

The formula is as follows: 63.53 percent of corn, 18.00 percent of 46 percent of soybean meal, 3.30 percent of wheat middling, 2.50 percent of DDGS, 2.50 percent of 50 percent of fermented soybean meal, 2.50 percent of fish meal, 0.79 percent of stone powder, 0.63 percent of dicalcium phosphate, 0.50 percent of salt, 4.92 percent of premix, 0.18 percent of DL-methionine, 0.64 percent of L-lysine hydrochloride, 0.01 percent of choline chloride, 3.22mg/kg of extra trace elements added by conversion, 60.20mg/kg of iron and 70.40mg/kg of zinc.

Example 2 phase

The formula is as follows: 63.53 percent of corn, 18.00 percent of 46 percent of soybean meal, 3.30 percent of wheat middling, 2.50 percent of DDGS, 2.50 percent of 50 percent of fermented soybean meal, 2.50 percent of fish meal, 0.79 percent of stone powder, 0.63 percent of dicalcium phosphate, 0.50 percent of salt, 4.92 percent of premix, 0.18 percent of DL-methionine, 0.64 percent of L-lysine hydrochloride, 0.01 percent of choline chloride, 4.62mg/kg of extra trace elements added by conversion, 136.20mg/kg of iron, 95.40mg/kg of zinc and 36.78mg/kg of manganese.

Example phase two 4

The formula is as follows: 63.53 percent of corn, 18.00 percent of 46 percent of soybean meal, 3.30 percent of wheat middling, 2.50 percent of DDGS, 2.50 percent of 50 percent of fermented soybean meal, 2.50 percent of fish meal, 0.79 percent of stone powder, 0.63 percent of dicalcium phosphate, 0.50 percent of salt, 4.92 percent of premix, 0.18 percent of DL-methionine, 0.64 percent of L-lysine hydrochloride, 0.01 percent of choline chloride, 24.62mg/kg of extra trace elements of copper, 71.20mg/kg of iron, 63.40mg/kg of zinc and 44.78mg/kg of manganese.

In the formula, the same nutritional level is used as a premise in the same stage, and only the addition amount of exogenous trace elements (copper, iron, zinc and manganese) is changed.

Detecting the index：

Growth performance: daily feed intake, daily gain, feed conversion ratio, diarrhea rate, and death and culling rate.

Concentration of trace elements in organs, serum and feces.

TABLE 7 influence of daily ration microelement addition mode on piglet growth performance

As can be seen from Table 7, the levels of trace elements added in different modes in the daily ration have little influence on the daily feed intake, daily gain and feed-meat ratio of pigs (P > 0.05).

Table 8 effect of daily ration trace element addition pattern on mortality and diarrhea rate of piglets (%)

As can be seen from table 8, the trace element addition levels in the diets of different patterns did not cause significant differences in the mortality and diarrhea rates of pigs (P > 0.05).

TABLE 9 influence of daily ration microelement addition model on piglet organ index (g/kg)

As can be seen from table 9, the different patterns of trace element addition levels in the diets did not cause significant differences in the organ index of the pigs (P > 0.05).

TABLE 10 Effect of different modes of addition on copper deposition in piglet organ tissue and fecal excretion

Remarking: the measured concentration units in liver, kidney and feces are mg/kg, and the measured concentration in serum is mg/L.

As can be seen from table 10, the basal diet group with copper element concentration in liver was significantly higher than danish standard group (P < 0.05) at 69 days of age. The concentrations of other treated copper were not significantly different (P > 0.05); at 83 days of age, the concentration of copper in the kidneys was significantly higher in the commercial diets than in the basal diet (P < 0.05). The commercial ration group with copper element concentration in feces is obviously higher than other treatment groups (P < 0.05), and the industry standard group is obviously higher than the basic ration group (P < 0.05).

TABLE 11 Effect of different modes of addition on piglet organ tissue deposition and iron in fecal excretion

Remarking: the measured concentration units in the liver, kidney and feces are mg/kg, and the measured concentration in the serum is mg/L.

As can be seen from table 11, the iron concentration in the kidney was significantly lower in the 69 days of age than in the danish standard group and the commercial diet group (P < 0.05). The concentration of iron element in feces is significantly higher in Danish standard group than other treatment groups (P < 0.05), and the concentration of iron element in feces is significantly higher in industry standard group than basic daily ration group and commercial daily ration group (P < 0.05); at 83 days of age, the concentration of iron in the kidneys was significantly higher in the danish standard group than in the other treatment groups (P < 0.05) and the industry standard group was significantly higher than in the basal diet group (P < 0.05). The concentration of iron element in feces is significantly higher in danish standard group than other treatment groups (P < 0.05), and the industry standard group is significantly higher than basal and commercial ration groups (P < 0.05).

TABLE 12 Effect of different modes of addition on Zinc deposition in organ and tissue and fecal excretion of piglets

As can be seen from Table 12, the concentration of zinc element in the tissues and feces of 69 days old had no significant difference (P > 0.05); at the age of 83 days, the zinc element concentration in the kidney is obviously higher in the industry standard group than in the basal diet group (P < 0.05), and the zinc element concentration in the kidney is obviously higher in the industry standard group than in the basal diet group (P < 0.05). The concentration of zinc element in feces in industry standard combination Danish standard group has no significant difference (P > 0.05) but is higher than other treatment groups (P < 0.05), and the commercial ration group is significantly higher than the basic ration group (P < 0.05).

TABLE 13 Effect of different modes of addition on piglet organ tissue deposition and fecal excretion of manganese

As can be seen from table 13, the concentration of manganese element in liver was significantly higher in the 69-day-old commercial diet group than in the basal diet group and danish standard group (P < 0.05). The basal diet group at the concentration of manganese in the kidney was significantly lower than the danish standard group and the commercial diet group (P < 0.05). The concentration of manganese element in feces in danish standard combination has no significant difference between the commercial day group and the commercial day group (P > 0.05) but is significantly higher than that of the basic ration group and the industry standard group (P < 0.05), and the industry standard group is significantly lower than that of the basic ration group (P < 0.05); at 83 days of age, the concentration of manganese in the kidney was significantly lower in the basal diet group than in the other treatment groups (P < 0.05), with no significant difference between the other treatment groups (P > 0.05). The concentration of manganese element in feces has no significant difference between the basic ration group and the industry standard group (P > 0.05), and the danish standard group and the commercial ration group have no significant difference (P > 0.05), but the danish standard combination commercial ration group is significantly higher than the basic ration combination industry standard group (P < 0.05).

From the above data:

the production performance indexes show that the average daily feed intake, the average daily gain, the feed conversion ratio, the diarrhea rate, the death and culling rate and the organ index do not have obvious difference (P is more than 0.05) along with the change of the trace element adding mode, which indicates that the trace element content in the feed raw materials can also maintain the good production performance of the piglets of 56-83 days old, and the utilization rate of the trace elements in the early stage of the weaning of the piglets is higher than that in the late stage of the weaning and the middle and later fattening period, and the demand is relatively larger, so the feed formula can also meet the growth and development requirements of the pigs in the late stage of the weaning and the middle and later fattening period.

From the concentrations of trace elements in organs, serum and feces, the following can be found:

the concentration of trace elements in serum is not affected by the trace element addition pattern (P > 0.05). Blood is the main pathway for the circulation of body substances and can reflect the body's demand for substances.

Some elements in the liver and the kidney are influenced by the adding mode of the trace elements at different stages, and the trace elements are more added, and the trace elements in the liver and the kidney are more deposited.

The trace element concentration in the feces shows that the concentration of iron and manganese in the stage one is increased along with the increase of the trace element adding amount in the feed (P is less than 0.05), and the concentration of copper, iron, zinc and manganese in the stage two is increased along with the increase of the trace element adding amount in the feed (P is less than 0.05). The more the trace elements in the feed eaten by the pigs, the more the trace elements in the manure which cannot be absorbed are.

This shows that the addition of extra trace elements in the feed cannot increase the growth performance of 56-83 day-old piglets, but causes more trace elements in the manure to be wasted, so that the manure is discharged to the outside to pollute the environment.

Therefore, in the practice of animal husbandry production, the formula of the environment-friendly emission-reducing piglet feed without adding exogenous trace elements can maintain the growth performance of piglets of 56-83 days old, has no negative influence on subsequent growth, reduces the emission of trace elements in feces, reduces the waste of trace element resources, and is favorable for the sustainable development requirement of environment-friendly animal husbandry.

Finally, it should be noted that, although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A feeding method for piglets is characterized by comprising the following steps: the piglet feed without adding exogenous trace elements is adopted to feed piglets, and consists of two-stage feeds, namely a stage-one feed and a stage-two feed, and comprises the following raw materials in percentage by weight:

stage one feed: 61-62% of corn, 13-14% of 46% of soybean meal, 4-5% of wheat middling, 5-6% of whey powder, 2-3% of 50% of fermented soybean meal, 2-3% of fish meal, 0.5-1% of stone powder, 0.5-1% of monocalcium phosphate, 0.1-0.2% of salt, 7-8% of premix, 0.1-0.2% of DL-methionine, 0.4-0.6% of L-lysine hydrochloride and 0.01-0.02% of choline chloride;

stage two feed: 63-64 percent of corn, 18-20 percent of 46 percent of soybean meal, 3-5 percent of wheat middling, 2-3 percent of DDGS, 2-3 percent of 50 percent of fermented soybean meal, 2-4 percent of fish meal, 0.5-0.8 percent of stone powder, 0.6-0.8 percent of monocalcium phosphate, 0.5-0.8 percent of salt, 4-5 percent of premix, 0.1-0.2 percent of DL-methionine, 0.6-0.8 percent of L-lysine hydrochloride and 0.01-0.02 percent of choline chloride;

the phase one premix comprises the following components:

the phase two premix comprises the following components:

the feeding method comprises the following steps: feeding stage one feed for piglets of 56-69 days old; feeding stage II feed for 70-83 day-old piglets.

2. The method of feeding piglets according to claim 1, wherein the premix further comprises a flavoring agent, an antioxidant and a carrier; the carrier comprises medical stone for feed and rice hull powder.

3. The method of feeding piglets according to claim 1, wherein the stage one feed and the stage two feed consist of the following raw materials in weight percent:

stage one feed: 61.74 percent of corn, 13.64 percent of 46 percent of soybean meal, 5.00 percent of wheat middling, 5.00 percent of whey powder, 2.50 percent of 50 percent of fermented soybean meal, 2.50 percent of fish meal, 0.79 percent of stone powder, 0.62 percent of monocalcium phosphate, 0.10 percent of salt, 7.38 percent of premix, 0.19 percent of DL-methionine, 0.53 percent of L-lysine hydrochloride and 0.01 percent of choline chloride;

stage two feed: 63.53% of corn, 18.00% of 46% of soybean meal, 3.30% of wheat middling, 2.50% of DDGS, 2.50% of 50% of fermented soybean meal, 2.50% of fish meal, 0.79% of stone powder, 0.63% of monocalcium phosphate, 0.50% of salt, 4.92% of premix, 0.18% of DL-methionine, 0.64% of L-lysine hydrochloride and 0.01% of choline chloride.

4. The feeding method of piglets according to any one of claims 1 to 3, wherein the preparation method of the piglet feed without adding exogenous trace elements comprises the step of mixing the raw materials of piglets according to the weight percentage.

5. Use of the feeding method of piglets according to any of claims 1-4, which comprises:

2) Reduce the discharge of trace elements in the pig manure.