Feed additive for sows in lactation period and preparation method of feed additive

Abstract

The invention relates to the technical field of feed additives, and particularly discloses a feed additive for sows in a lactation period and a preparation method of the feed additive. The feed additive is prepared from 5 to 10 parts of radix angelicae sinensis, 0.0003 to 0.0005 part of organic selenium, 10 to 15 parts of calcium carbonate, 8 to 12 parts of calcium hydrophosphate, 1 to 5 parts of a lactic acid bacteria preparation, 0.5 to 2 parts of a bacillus preparation, 0.1 to 0.3 part of vitamin C, 0.2 to 0.4 part of a flavoring agent, 5 to 15 parts of a sweetening agent and 1 to 3 parts of citric acid. The feed additive disclosed by the invention can improve the breast milk quality and yield of the sows in the lactation period, so that the growth performance, the immune performance and the intestinal health of piglets are improved.

Description

Technical Field

[0001] The invention relates to the field of feed additives, and in particular to a feed additive for sows during lactation and a preparation method thereof. Background Art

[0002] With the development of modern breeding technology, the number of piglets born by sows has been greatly improved, but at the same time, the proportion of weak piglets is also increasing. In the entire growth cycle of pigs, the survival rate and growth and development of piglets are key points. Among them, the output and quality of breast milk will affect the growth rate, health, survival rate and weaning weight of suckling piglets, thereby affecting their later growth and fattening performance. However, with the increase in the number of piglets born by sows, the breast milk they produce cannot meet the growth needs of all piglets, which is one of the important reasons for the emergence of weak piglets. Therefore, in order to solve the problem of the increase in the proportion of weak piglets, it is necessary to add special feed additives to sows during the lactation period to improve the sow's breast milk feeding ability and increase the nutrients in sow's breast milk.

[0003] Existing sow lactation feed additives can be divided into the following categories according to their ingredients: amino acids, vitamins, minerals, probiotics and Chinese medicinal herbs. However, the nutrients provided by each sow lactation feed additive are too single, and the palatability of the additive is not considered, making it not very effective in reducing the number of weak piglets.

[0004] Therefore, it is necessary to design a new feed additive for sows during lactation to solve the problems of a large number of weak piglets and low survival rate. Summary of the invention

[0005] In view of this, the present invention proposes a feed additive for sows during lactation, aiming to solve the problem of a large number of weak piglets and a low survival rate.

[0006] On the one hand, the present invention provides a feed additive for sows during lactation, comprising the following components in parts by weight:

[0007] 5-10 parts of angelica, 0.0003-0.0005 parts of organic selenium, 10-15 parts of calcium carbonate, 8-12 parts of calcium hydrogen phosphate, 1-5 parts of lactic acid bacteria preparation, 0.5-2 parts of bacillus preparation, 0.1-0.3 parts of vitamin C, 0.2-0.4 parts of flavoring agent, 5-15 parts of sweetener and 1-3 parts of citric acid.

[0008] On the other hand, the present invention also provides a method for preparing the feed additive for sows during lactation, comprising the following steps:

[0009] The calcium carbonate and the calcium hydrogen phosphate are first mixed and stirred to obtain a first mixture;

[0010] adding a lactic acid bacteria preparation, a bacillus preparation and organic selenium to the first mixture for a second mixing, and stirring to obtain a second mixture;

[0011] Vitamin C, angelica sinensis, citric acid, flavoring agent and sweetener are added to the second mixture for a third mixing, and the feed additive for sows in lactation is obtained after stirring.

[0012] Furthermore, before the second mixing, the angelica is sun-dried and crushed into fine powder, and then screened using a 100-mesh sieve.

[0013] Furthermore, before the first mixing, the calcium carbonate and the calcium hydrogen phosphate are screened using an 80-mesh sieve.

[0014] Furthermore, the lactic acid bacteria preparation and the bacillus preparation are stored in a low temperature environment of 0-8°C, and are taken out and placed in a room temperature environment for 2-3 hours before the second mixing.

[0015] Furthermore, during the second mixing and the third mixing, each time a component is added, stirring is performed at a speed of 20-30 rpm for 10-15 minutes before adding the next component.

[0016] Furthermore, after the second mixing and stirring is completed, the mixture is turned over to observe whether there is agglomeration. If agglomeration exists, the agglomerates are broken up, and then stirred again at a speed of 20-30 rpm for 10-15 minutes.

[0017] Furthermore, the stirring speed of the first mixing is 10-15 rpm, and the stirring time is 5-10 minutes.

[0018] The present invention also proposes the application of the feed additive for sows in lactation period, that is, adding the feed additive for sows in lactation period into the basic feed of sows in lactation period.

[0019] Furthermore, 5-10 portions of the feed additive for sows during lactation are added to every 1,000 portions of the basic feed.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The feed additive of the present invention is enriched with nutrients by adding angelica, organic selenium, calcium carbonate, calcium hydrogen phosphate, lactic acid bacteria preparation, bacillus preparation and vitamin C. At the same time, the angelica and organic selenium work together to improve the ability of sows to resist external pathogens, reduce the incidence of sow diseases, and thus ensure the secretion of milk; the angelica is used in combination with calcium and phosphorus to improve the utilization efficiency of minerals, better prevent the problem of postpartum paralysis in sows, and improve the nutritional value of milk; the synergistic effect of angelica, lactic acid bacteria and bacillus improves the digestion and absorption capacity of sows; the synergistic effect of angelica and vitamin C effectively alleviates the stress response of sows, increases the feed intake of sows, enables sows to take in more nutrients for milk production, improves the quality of breast milk, ensures sufficient breast milk supply, and further improves the growth performance, immune performance and intestinal health of piglets.

[0022] 2. The palatability of the feed additive of the present invention is greatly improved by adding flavoring agents, sweeteners and citric acid, thereby increasing the feed intake of sows. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0024] Figure 1 The present invention provides a flow chart of a method for preparing a feed additive for sows during lactation.

[0025] Figure 2 A graph showing changes in serum hormone and immunoglobulin levels in piglets provided by an embodiment of the present invention;

[0026] Figure 3 A graph showing changes in sow milk immunoglobulin content provided by an embodiment of the present invention;

[0027] Figure 4 HE slices of piglet duodenum tissue and schematic diagrams of villus height, crypt depth and villus / crypt ratio provided in an embodiment of the present invention;

[0028] Figure 5 A HE section image of piglet jejunum tissue and a schematic diagram of villus height, crypt depth and villus / crypt ratio provided in an embodiment of the present invention;

[0029] Figure 6 A HE section diagram of piglet ileum tissue and a schematic diagram of villus height, crypt depth and villus / crypt ratio provided in an embodiment of the present invention; DETAILED DESCRIPTION

[0030] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] With the development of modern selection technology, the number of sow litters has been greatly improved, but at the same time, the proportion of weak piglets is also increasing. In the entire growth cycle of pigs, the survival rate and growth and development of piglets are key points. The output and quality of breast milk will affect the growth rate, health, survival rate and weaning weight of suckling piglets, thereby affecting their later growth and fattening performance. However, with the increase in the number of sow litters, the breast milk produced cannot meet the growth needs of all piglets, resulting in the phenomenon of weak piglets. Therefore, in order to solve the problem of the increase in the proportion of weak piglets, it is necessary to add special feed additives to sows during lactation to improve the sow's breast milk feeding ability and increase the nutrients in sow milk. Existing sow lactation feed additives can be divided into amino acids, vitamins, minerals, probiotics and Chinese medicinal herbs according to their ingredients. However, the nutrients provided by each sow lactation feed additive are too single, and the palatability of the additive is not considered, which makes it not effective in reducing the number of weak piglets. Therefore, it is necessary to design a new feed additive for sows during lactation to solve the problems of a large number of weak piglets and low survival rate.

[0032] On the one hand, in some embodiments of the present application, the feed additive for sows during lactation comprises the following components in parts by weight:

[0033] 5-10 parts of angelica, 0.0003-0.0005 parts of organic selenium, 10-15 parts of calcium carbonate, 8-12 parts of calcium hydrogen phosphate, 1-5 parts of lactic acid bacteria preparation, 0.5-2 parts of bacillus preparation, 0.1-0.3 parts of vitamin C, 0.2-0.4 parts of flavoring agent, 5-15 parts of sweetener and 1-3 parts of citric acid.

[0034] The feed additive for sows in lactation of the present invention preferably includes the following components in parts by weight: 8-10 parts of angelica, 0.0004-0.0005 parts of organic selenium, 13-15 parts of calcium carbonate, 10-12 parts of calcium hydrogen phosphate, 3-5 parts of lactic acid bacteria preparation, 1-2 parts of bacillus preparation, 0.2-0.3 parts of vitamin C, 0.3-0.4 parts of flavoring agent, 10-15 parts of sweetener and 2-3 parts of citric acid.

[0035] The feed additive for sows in lactation of the present invention includes the following components in parts by weight, which are further preferably: 10 parts of angelica, 0.0005 parts of organic selenium, 15 parts of calcium carbonate, 12 parts of calcium hydrogen phosphate, 5 parts of lactic acid bacteria preparation, 2 parts of bacillus preparation, 0.3 parts of vitamin C, 0.4 parts of flavoring agent, 15 parts of sweetener and 3 parts of citric acid.

[0036] Specifically, the flavoring agent directly uses the feed-grade flavoring agent available in the art.

[0037] It is understandable that organic selenium itself can improve the antioxidant capacity and reproductive performance of sows. The active ingredients of angelica, on the basis of regulating body functions, can work together with organic selenium to better resist the invasion of external pathogens, reduce the incidence of sow diseases, and thus ensure the normal secretion of milk.

[0038] It is understandable that angelica improves blood circulation and helps the transportation and absorption of minerals such as calcium and phosphorus in the sow's body. During lactation, sows need a lot of calcium and phosphorus to maintain their own bone strength and ensure that there is enough calcium and phosphorus in the milk for the piglet's bone development. Therefore, angelica is used in combination with calcium and phosphorus to improve the utilization efficiency of minerals, better prevent sow postpartum paralysis and other problems, and improve the nutritional value of milk.

[0039] It is understandable that angelica promotes the optimization of the intestinal nutrient absorption environment by improving blood circulation and body functions, thereby enabling lactic acid bacteria to grow and reproduce better. The synergistic effect of the two can improve the sow's digestion and absorption capacity, provide more nutrients for milk secretion, and also enhance the sow's overall health.

[0040] It is understandable that Bacillus can secrete a variety of digestive enzymes to promote the digestion and absorption of feed by sows, while Angelica's blood-activating and blood-stasis-removing effects can provide a better intestinal physiological environment for Bacillus to exert its enzymatic reaction. The combined effect of the two can enhance the sow's digestive function and prevent intestinal diseases.

[0041] It is understandable that angelica can regulate the body functions of sows, and vitamin C is involved in collagen synthesis and immune regulation in sows. Together, they can more effectively relieve the sow's stress response, increase the sow's feed intake, and enable the sow to take in more nutrients for milk production.

[0042] It is understandable that sows have a sensitive sense of smell and taste. Adding flavoring agents and sweeteners can stimulate the sow's sense of smell and taste nerves, increase the palatability of feed, and thus increase the sow's feed intake. On the one hand, citric acid can inhibit the growth of harmful microorganisms in feed and prolong the shelf life of feed. On the other hand, acidified feed can improve the taste of feed, stimulate the sow's taste buds, promote the secretion of gastric acid and digestive enzymes, improve the sow's digestive ability, and thus increase feed intake.

[0043] On the other hand, in some embodiments of the present application, a method for preparing a feed additive for sows during lactation comprises the following steps:

[0044] The calcium carbonate and the calcium hydrogen phosphate are first mixed and stirred to obtain a first mixture;

[0045] adding a lactic acid bacteria preparation, a bacillus preparation and organic selenium to the first mixture for a second mixing, and stirring to obtain a second mixture;

[0046] Vitamin C, angelica sinensis, citric acid, flavoring agent and sweetener are added to the second mixture for a third mixing, and the feed additive for sows in lactation is obtained after stirring.

[0047] In some embodiments of the present application, before the second mixing, the angelica is sun-dried and crushed into fine powder, and then screened using a 100-mesh sieve.

[0048] It can be understood that after the angelica is dried and crushed into fine powder, the powder is screened with a 100-mesh sieve to ensure that the particle size is fine and uniform, which is conducive to uniform distribution in the additive.

[0049] In some embodiments of the present application, before the first mixing, the calcium carbonate and the calcium hydrogen phosphate are screened using an 80-mesh sieve.

[0050] It is understood that screening can remove the large particles present to ensure uniform dispersion in the additive.

[0051] In some embodiments of the present application, the lactic acid bacteria preparation and the bacillus preparation are stored in a low temperature environment of 0-8°C, and are taken out and placed in a room temperature environment for 2-3 hours before the second mixing, preferably for 3 hours.

[0052] It is understandable that low-temperature storage can effectively ensure the activity of lactic acid bacteria preparations and Bacillus preparations. At the same time, placing them for 3 hours before use can avoid sudden temperature changes that may cause inactivation of the bacteria or reduction in activity.

[0053] In some embodiments of the present application, during the second mixing and the third mixing, after each component is added, stirring is performed at a speed of 20-30 rpm for 10-15 minutes before adding the next component; the stirring speed is preferably 30 rpm, and the stirring time is preferably 15 minutes.

[0054] It will be appreciated that stirring each component before adding the next component can ensure that each component is evenly dispersed in the additive.

[0055] In some embodiments of the present application, after the second mixing and stirring is completed, the mixture is turned over to observe whether there is agglomeration. When agglomeration occurs, the agglomerates are broken up and then stirred again at a speed of 20-30 rpm for 10-15 minutes; the stirring speed is preferably 30 rpm, and the stirring time is preferably 15 minutes.

[0056] Understandably, vitamin C is a sensitive ingredient, especially if there is agglomeration. If stirring continues, especially if the agglomerates are not processed, the local pressure, friction and possible local temperature changes caused by agglomeration may accelerate the oxidation process of vitamin C and lose its nutritional value, so make sure there is no agglomeration before adding the vitamin.

[0057] In some embodiments of the present application, the stirring speed of the first mixing is 10-15 rpm, and the stirring time is 5-10 minutes; the stirring speed is preferably 15 rpm, and the stirring time is preferably 10 minutes.

[0058] On the other hand, in some embodiments of the present application, the use of the feed additive for sows during lactation includes adding the feed additive for sows during lactation to the basic feed of lactating sows.

[0059] In some embodiments of the present application, 5-10 portions of the feed additive for sows during lactation are added to every 1000 portions of the basic feed; preferably, 5 portions of the feed additive for sows during lactation are added to every 1000 portions of the basic feed.

[0060] Example 1

[0061] S1. sieve the calcium carbonate and calcium hydrogen phosphate using an 80-mesh sieve, put 10 parts of calcium carbonate and 8 parts of calcium hydrogen phosphate after sieving into a container, and mix and stir at a speed of 10 rpm for 5 minutes to obtain a first mixture.

[0062] S2, taking out 1 part of the stored lactic acid bacteria preparation and 0.5 part of the bacillus preparation, placing them at room temperature for 2 hours for standby use, adding 1 part of the lactic acid bacteria preparation, 0.5 part of the bacillus preparation and 0.0003 part of organic selenium into the first mixture and stirring and mixing, stirring at a speed of 20 rpm for 10 minutes after adding each component during mixing, and then adding the next component, after stirring, turning the mixture over to observe whether there is agglomeration phenomenon, when agglomeration phenomenon exists, breaking up the agglomerates, and then stirring again at a speed of 20 rpm for 10 minutes to obtain a second mixture.

[0063] S3. Dry the angelica sinensis and grind it into fine powder, then screen it with a 100-mesh sieve, add 0.1 parts of vitamin C, 5 parts of the screened angelica sinensis, 1 part of citric acid, 0.2 parts of flavoring agent and 5 parts of sweetener to the second mixture and stir and mix them. When mixing, after adding each component, stir at a speed of 20 rpm for 10 minutes before adding the next component to obtain the feed additive for sows during lactation.

[0064] Example 2

[0065] S1. sieve the calcium carbonate and calcium hydrogen phosphate using an 80-mesh sieve, put 13 parts of calcium carbonate and 10 parts of calcium hydrogen phosphate after sieving into a container, and mix and stir at a speed of 15 rpm for 10 minutes to obtain a first mixture.

[0066] S2, take out 3 parts of lactic acid bacteria preparation and 1 part of bacillus preparation from storage, place them at room temperature for 3 hours for standby use, put 3 parts of lactic acid bacteria preparation, 1 part of bacillus preparation and 0.0004 part of organic selenium into the first mixture and stir and mix, after adding each component during mixing, stir at a speed of 30 rpm for 15 minutes before adding the next component, after stirring, turn the mixture over to observe whether there is agglomeration, when agglomeration occurs, break up the agglomerates, and then stir again at a speed of 30 rpm for 15 minutes to obtain a second mixture.

[0067] S3. Dry the angelica sinensis and grind it into fine powder, then screen it with a 100-mesh sieve, add 0.2 parts of vitamin C, 8 parts of the screened angelica sinensis, 2 parts of citric acid, 0.3 parts of flavoring agent and 10 parts of sweetener to the second mixture and stir and mix them. When mixing, after adding each component, stir at a speed of 30 rpm for 15 minutes before adding the next component to obtain the feed additive for sows during lactation.

[0068] Example 3

[0069] S1. sieve the calcium carbonate and calcium hydrogen phosphate using an 80-mesh sieve, put 15 parts of the sieved calcium carbonate and 12 parts of the calcium hydrogen phosphate into a container, and mix and stir at a speed of 15 rpm for 10 minutes to obtain a first mixture.

[0070] S2, take out 5 parts of lactic acid bacteria preparation and 2 parts of bacillus preparation from storage, place them at room temperature for 3 hours for standby, put 5 parts of lactic acid bacteria preparation, 2 parts of bacillus preparation and 0.0005 parts of organic selenium into the first mixture and stir and mix, after adding each component during mixing, stir at a speed of 30 rpm for 15 minutes before adding the next component, after stirring, turn the mixture over to observe whether there is agglomeration, when agglomeration exists, break up the agglomerates, and then stir again at a speed of 30 rpm for 15 minutes to obtain a second mixture.

[0071] S3. Dry the angelica sinensis and grind it into fine powder, then screen it with a 100-mesh sieve, add 0.3 parts of vitamin C, 10 parts of the screened angelica sinensis, 3 parts of citric acid, 0.4 parts of flavoring agent and 15 parts of sweetener to the second mixture and stir and mix them. When mixing, after adding each component, stir at a speed of 30 rpm for 15 minutes before adding the next component to obtain the feed additive for sows during lactation.

[0072] Effect test

[0073] Thirty-six Danish Landrace sows with similar delivery period and 3-4 parities were selected and divided into 3 groups, namely control group (CON), 0.5% ASE group and 1% ASE group, with 7 pigs in each group. The control group (CON) was fed with ordinary sow feed, while the 0.5% ASE group and 1% ASE group added the feed additive for sow lactation prepared according to the preparation method of Example 3 to ordinary sow feed to feed the sows. It started from the 4th day after the sow gave birth and ended when the piglets were weaned at 21 days of age. At the beginning, the number of piglets per sow and the litter weight of piglets were adjusted to ensure that there was no difference in the initial conditions of the experiment. During this period, the piglets were not treated and only ate breast milk. On the end day, 5 piglets were randomly selected from each group for slaughter and sampling, and sow feces and blood were collected.

[0074] In the 0.5% ASE group, 5 portions of feed additives for sows during lactation were added to every 1000 portions of ordinary sow feed, and in the 1% ASE group, 10 portions of feed additives for sows during lactation were added to every 1000 portions of ordinary sow feed.

[0075] The experimental results are as follows:

[0076] Table 1 Sow feed intake and piglet weight

[0077]

[0078] It can be seen that 0.5% ASE can significantly increase the individual weight and average daily weight gain of piglets at weaning. 1% ASE can also increase the individual weight and average daily weight gain of piglets at weaning, but the difference is not significant.

[0079] See also Figure 2As shown in the figure, different concentrations of ASE groups can increase the levels of GH, T3, and T4 in piglet serum, and the 1% ASE group significantly increased them. Different concentrations of ASE groups can increase the levels of immunoglobulins in piglet serum, and 0.5% ASE can significantly increase the IgG content in piglet serum.

[0080] See also Figure 3 As shown, the 0.5% ASE and 1% ASE groups could significantly increase the contents of IgA and IgG in sow milk, and IgM showed an increasing trend but the difference was not significant.

[0081] See also Figure 4-6 As shown, the 0.5% ASE group can significantly increase the length of duodenal villi in piglets, and the 1% ASE group can significantly increase the length of duodenal villi and reduce the crypt depth; the 0.5% ASE group can significantly increase the length of jejunal villi in piglets, and the 1% ASE group can significantly increase it, but there is no significant difference in the crypt depth of the jejunum between the two groups; 0.5% ASE can significantly increase the villus-crypt ratio of the ileum of piglets; the 1% ASE group can significantly increase the length of ileal villi and crypt depth, and the villus-crypt ratio of the ileum of piglets in both groups has an increasing trend, but the difference is not significant.

[0082] In summary, by adding the feed additive for sows during lactation to the feed of lactating sows, the content of IgA and IgG in sow milk can be significantly increased, thereby increasing the hormone levels of piglet serum GH, T3, T4 and serum immunoglobulin levels, and thus improving the disease resistance of piglets; at the same time, the feed additive for sows during lactation can also increase the length of piglet duodenal villi, reduce the depth of the crypts and the duodenal villus-crypt ratio, so that the digestive ability of piglets is enhanced, thereby increasing the individual weight of piglets at weaning and the average daily weight gain.

[0083] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0084] The present application is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0085] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0086] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A feed additive for sows during lactation, characterized in that: The composition includes the following components in parts by weight: 5-10 parts of angelica, 0.0003-0.0005 parts of organic selenium, 10-15 parts of calcium carbonate, 8-12 parts of calcium hydrogen phosphate, 1-5 parts of lactic acid bacteria preparation, 0.5-2 parts of bacillus preparation, 0.1-0.3 parts of vitamin C, 0.2-0.4 parts of flavoring agent, 5-15 parts of sweetener and 1-3 parts of citric acid.

2. A method for preparing the feed additive according to claim 1, characterized in that: The following steps are involved: The calcium carbonate and the calcium hydrogen phosphate are first mixed and stirred to obtain a first mixture; adding a lactic acid bacteria preparation, a bacillus preparation and organic selenium to the first mixture for a second mixing, and stirring to obtain a second mixture; Vitamin C, angelica sinensis, citric acid, flavoring agent and sweetener are added to the second mixture for a third mixing, and the feed additive for sows in lactation is obtained after stirring.

3. The method for preparing the feed additive according to claim 2, characterized in that: Before the second mixing, the angelica is sun-dried and crushed into fine powder, and then sieved using a 100-mesh sieve.

4. The method for preparing the feed additive according to claim 2, characterized in that: Before the first mixing, the calcium carbonate and the calcium hydrogen phosphate were screened using an 80-mesh screen.

5. The method for preparing the feed additive according to claim 2, characterized in that: The lactic acid bacteria preparation and the bacillus preparation are stored in a low temperature environment of 0-8°C, and are taken out and placed in a room temperature environment for 2-3 hours before the second mixing.

6. The method for preparing the feed additive according to claim 2, characterized in that: During the second and third mixing, each time a component is added, stirring is performed at a speed of 20 to 30 rpm for 10 to 15 minutes before adding the next component.

7. The method for preparing the feed additive according to claim 2, characterized in that: After the second mixing and stirring is completed, the mixture is turned over to observe whether there is agglomeration. If agglomeration exists, the agglomerates are broken up, and then the mixture is stirred again at a speed of 20-30 rpm for 10-15 minutes.

8. The method for preparing the feed additive according to claim 2, characterized in that: The stirring speed of the first mixing is 10-15 rpm, and the stirring time is 5-10 minutes.

9. A use of the feed additive for sows during lactation according to claim 1, characterized in that: The feed additive for sows in lactation is added to the basic feed of lactating sows.

10. The use of the feed additive for sows during lactation according to claim 9, characterized in that: 5-10 portions of the feed additive for sows in lactation are added to every 1000 portions of the basic feed.

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