An additive for improving the calcium content of cattle feed and a method for preparing the same

Abstract

The application discloses an additive capable of improving calcium in cattle feed and a preparation method thereof, and relates to the technical field of feed additives. The additive comprises the following components in mass fractions: nano calcium carbonate-chitosan composite microspheres 15-25 parts; calcium lactate 8-12 parts; calcium-chelated modified diatomite 10-18 parts; vitamin-cyclodextrin inclusion compound 0.1-0.3 parts; composite probiotics 3-6 parts; traditional Chinese medicine polysaccharide compound 5-10 parts; and xylo-oligosaccharide 2-4 parts. The application fully plays the synergistic effect of inorganic calcium and organic calcium by compounding multiple calcium sources and adopting the composite microsphere technology, prevents the loss of calcium in the stomach, eliminates the antagonistic effect of anti-nutritional factors on calcium, and thus improves the bioavailability of calcium. Meanwhile, the synergistic effect of the composite probiotics and high-purity xylo-oligosaccharide enhances the regulation ability of the intestinal microecology, and creates a good environment for the absorption of calcium.

Description

Technical Field

[0001] This invention relates to the field of feed additive technology, and more specifically, to an additive that can increase the calcium content of cattle feed and its preparation method. Background Technology

[0002] Calcium is one of the core nutrients for the growth, development, and metabolism of cattle, directly affecting calf bone development, the growth rate of fattening cattle, and the lactation performance and milk quality of dairy cows. Calcium deficiency in calves can easily lead to rickets and skeletal deformities, while in fattening cattle it can cause stunted growth and reduced feed efficiency. In dairy cows, calcium deficiency can significantly reduce milk production and easily induce metabolic diseases such as postpartum paralysis and retained placenta. Therefore, the scientific supplementation of calcium additives into cattle feed is a key aspect of large-scale cattle farming.

[0003] Currently, existing calcium additives for cattle feed are mainly divided into two categories: inorganic calcium and organic calcium. However, they generally have significant technical shortcomings: On the one hand, the combination of inorganic and organic calcium lacks scientific design, and their synergistic effect is not fully realized. Moreover, calcium is easily eroded and lost by gastric acid in the cow's stomach, making it difficult to achieve precise release at key sites of intestinal absorption, which greatly reduces calcium absorption efficiency. On the other hand, the probiotics added in some improved solutions are mostly single strains, which have weak colonization ability and low survival rate in the cattle's intestines, making it difficult to effectively regulate the intestinal microecological balance and failing to create a high-quality intestinal environment for calcium absorption.

[0004] There are currently no effective solutions to the problems in the relevant technologies. Summary of the Invention

[0005] In view of the problems in the related technologies, the present invention proposes an additive that can improve the calcium content of cattle feed and its preparation method, so as to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] Therefore, the specific technical solution adopted by the present invention is as follows: According to one aspect of the present invention, an additive is provided that can increase the calcium content of cattle feed, the additive comprising the following components in parts by weight: 15-25 parts of nano-calcium carbonate-chitosan composite microspheres; 8-12 parts of calcium lactate; 10-18 parts of calcium-chelated modified diatomaceous earth; Vitamin-cyclodextrin inclusion complex 0.1-0.3 parts; 3-6 servings of compound probiotics; 5-10 parts of traditional Chinese medicine polysaccharide complex; 2-4 parts xylooligosaccharides.

[0007] Optionally, the nano-calcium carbonate-chitosan composite microspheres comprise nano-calcium carbonate and chitosan, wherein the mass ratio of nano-calcium carbonate to chitosan is 1:(0.3-0.5).

[0008] Optionally, the particle size of the nano-calcium carbonate-chitosan composite microspheres is 1-5 μm.

[0009] Optionally, the calcium chelated modified diatomaceous earth comprises: activated diatomaceous earth and calcium chloride, wherein the mass ratio of activated diatomaceous earth to calcium chloride is 1:(0.2-0.3).

[0010] Optionally, the calcium loading of the calcium-chelated modified diatomaceous earth is greater than or equal to 120 mg / g.

[0011] Optionally, the vitamin-cyclodextrin inclusion complex comprises vitamin D3 and β-cyclodextrin, wherein the mass ratio of vitamin D3 to β-cyclodextrin is 1:(10-15).

[0012] Optionally, the compound probiotics include: Lactobacillus plantarum, Lactobacillus casei, and Rhodopseudomonas palustris, and the mass ratio of Lactobacillus plantarum, Lactobacillus casei, and Rhodopseudomonas palustris is 1:1.2:1.

[0013] Optionally, the herbal polysaccharide complex includes: Astragalus membranaceus, Taraxacum mongolicum, Glycyrrhiza uralensis and Atractylodes macrocephala, and the mass ratio of Astragalus membranaceus, Taraxacum mongolicum, Glycyrrhiza uralensis and Atractylodes macrocephala is 3:2:1:1.

[0014] Optionally, the purity of calcium lactate is greater than or equal to 99%, and the purity of xylooligosaccharides is greater than or equal to 95%.

[0015] According to another aspect of the present invention, a method for preparing an additive that can improve the calcium content of cattle feed is also provided, the method comprising: S1. Weigh out the following components according to the preset weights: nano-calcium carbonate-chitosan composite microspheres, calcium lactate, calcium chelated modified diatomaceous earth, vitamin-cyclodextrin inclusion complex, compound probiotics, traditional Chinese medicine polysaccharide complex and xylooligosaccharide. S2. Weigh out the completed nano-calcium carbonate-chitosan composite microspheres, calcium lactate, calcium chelated modified diatomaceous earth and xylooligosaccharide, and add them sequentially into a double helix mixer. Stir at 400-500 rpm for 20-25 minutes to obtain a premix. S3. Cool the premix to 25-30℃ using a cooling device, and add vitamin-cyclodextrin inclusion complex, compound probiotics, and traditional Chinese medicine polysaccharide complex to the cooled premix in sequence, and stir at 250-300 rpm for 15-20 minutes. S4. During the mixing process, the moisture content of the material is monitored in real time by a humidity monitoring device. If the moisture content exceeds the preset threshold, the low-temperature drying device is activated for synchronous drying to ensure that the final moisture content of the material is less than or equal to 6% and a composite material is obtained. S5. The obtained composite material is fed into an ultra-fine pulverizing equipment for pulverization, and the pulverized composite material is then fed into a vibrating screen and graded through a 120-mesh standard sieve. The composite material that does not pass through the sieve is returned to the ultra-fine pulverizing equipment for re-pulverization until all of them pass through. S6. Collect the qualified composite material that passes the sieve, and encapsulate it in a sterile environment using sterile packaging materials to obtain the additive.

[0016] The beneficial effects of this invention are as follows: 1. This invention improves calcium supplementation and aquaculture efficiency through scientific formula design and refined process control. The additive combines multiple calcium sources and uses composite microsphere technology to fully leverage the synergistic effect of inorganic and organic calcium, prevent calcium loss in the stomach, eliminate the antagonistic effect of anti-nutritional factors on calcium, and thus improve calcium bioavailability. At the same time, the synergistic effect of compound probiotics and high-purity xylooligosaccharides enhances the regulatory capacity of the intestinal microecology, creating a favorable environment for calcium absorption.

[0017] 2. This invention utilizes the synergistic effect between the polysaccharide complex of traditional Chinese medicine and its components to not only optimize intestinal metabolic function but also enhance the immunity of cattle, promote calf bone development, improve the growth efficiency of fattening cattle, and enhance the lactation performance of dairy cows. Advanced preparation processes such as staged controlled-speed mixing and low-temperature activity protection ensure the uniformity of additive quality and the stability of its effects, meeting the needs of modern large-scale cattle farming. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments 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.

[0019] Figure 1 This is a flowchart of a method for preparing an additive that can improve the calcium content of cattle feed according to an embodiment of the present invention. Detailed Implementation

[0020] To further illustrate the various embodiments, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. These drawings are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these drawings, those skilled in the art should be able to understand other possible implementation methods and the advantages of the present invention.

[0021] According to embodiments of the present invention, an additive that can improve the calcium content of cattle feed and a method for preparing the same are provided.

[0022] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments, such as... Figure 1 As shown, according to an embodiment of the present invention, an additive that can increase the calcium content of cattle feed comprises the following components in parts by weight: 15-25 parts of nano-calcium carbonate-chitosan composite microspheres; 8-12 parts of calcium lactate; 10-18 parts of calcium-chelated modified diatomaceous earth; Vitamin-cyclodextrin inclusion complex 0.1-0.3 parts; 3-6 servings of compound probiotics; 5-10 parts of traditional Chinese medicine polysaccharide complex; 2-4 parts xylooligosaccharides.

[0023] In this optional embodiment, the nano-calcium carbonate-chitosan composite microspheres comprise: nano-calcium carbonate and chitosan, and the mass ratio of nano-calcium carbonate to chitosan is 1:(0.3-0.5).

[0024] In this optional embodiment, the particle size of the nano-calcium carbonate-chitosan composite microspheres is 1-5 μm.

[0025] It should be further explained that 100g of 50nm nano-calcium carbonate was dispersed in deionized water, and Tween-80 was added for ultrasonic dispersion to form a suspension. Then, 30-50g of chitosan in a 1% acetic acid solution was added, and the mixture was stirred at 35-45℃ for 30-40min. Sodium hydroxide solution was added dropwise to adjust the pH to 6.5-7.0. After centrifugation, washing, freeze-drying, and pulverization, nano-calcium carbonate-chitosan composite microspheres with a particle size of 1-5μm were obtained. These composite microspheres, coated with chitosan at a specific mass ratio, utilize the biocompatibility and intestinal targeting properties of chitosan to reduce calcium loss in the stomach. The 1-5μm particle size design also enhances dispersibility in the intestine, enabling slow release of calcium and avoiding instantaneous excessive precipitation. At the same time, it reduces irritation to the intestinal mucosa and significantly improves calcium bioavailability and intestinal adaptability.

[0026] In this optional embodiment, the calcium chelated modified diatomaceous earth comprises: activated diatomaceous earth and calcium chloride, wherein the mass ratio of activated diatomaceous earth to calcium chloride is 1:(0.2-0.3).

[0027] In this optional embodiment, the calcium loading of the calcium-chelated modified diatomaceous earth is greater than or equal to 120 mg / g.

[0028] It should be further explained that calcium-chelated modified diatomaceous earth is compounded with activated diatomaceous earth and calcium chloride at a mass ratio of 1:(0.2-0.3). Through chelation, a stable calcium loading is achieved with a calcium loading of greater than or equal to 120 mg / g. This not only reduces calcium loss by utilizing the rich pore structure and large specific surface area of ​​activated diatomaceous earth, but also prevents the formation of insoluble complexes between calcium and anti-nutritional factors such as phosphorus and oxalic acid in the feed through chelation, effectively eliminating calcium antagonism. At the same time, the loaded calcium is continuously released for the body to absorb, significantly improving calcium utilization efficiency. It can also play an auxiliary role in intestinal conditioning of diatomaceous earth, further optimizing the nutrient absorption environment.

[0029] In this optional embodiment, the vitamin-cyclodextrin inclusion complex comprises vitamin D3 and β-cyclodextrin, and the mass ratio of vitamin D3 to β-cyclodextrin is 1:(10-15).

[0030] It should be further explained that vitamin D3 and β-cyclodextrin form an inclusion complex at a mass ratio of 1:(10-15). The hollow structure of β-cyclodextrin enables efficient encapsulation of vitamin D3, which significantly improves the stability of vitamin D3 during feed processing and storage, preventing its degradation due to oxidation, light exposure, etc. It also improves the dispersibility and absorption problems caused by its fat solubility, allowing it to be slowly released in the intestine and exert its full effect. It works synergistically with calcium to promote intestinal absorption and bone deposition. At the same time, the inclusion efficiency at this ratio is optimal, which can maximize the preservation of the biological activity of vitamin D and provide a key guarantee for the efficient utilization of calcium in cattle.

[0031] In this optional embodiment, the compound probiotics include: Lactobacillus plantarum, Lactobacillus casei, and Rhodopseudomonas palustris, and the mass ratio of Lactobacillus plantarum, Lactobacillus casei, and Rhodopseudomonas palustris is 1:1.2:1.

[0032] It should be further explained that *Lactobacillus plantarum* rapidly regulates the balance of intestinal flora, *Lactobacillus casei* strengthens the intestinal mucosal barrier function, and *Rhodopseudomonas palustris* assists in nutrient metabolism and immune enhancement. With this ratio, probiotics have stronger colonization ability and longer survival time, which can effectively inhibit the proliferation of harmful bacteria in the intestine and reduce the risk of digestive disorders, while also promoting the expression of intestinal calcium transport proteins, creating a high-quality microenvironment for calcium absorption. At the same time, it synergistically enhances the bovine body's immunity and complements other components in the additive, further amplifying the effects of calcium supplementation and growth promotion.

[0033] In this optional embodiment, the traditional Chinese medicine polysaccharide complex includes: Astragalus membranaceus, Taraxacum mongolicum, Glycyrrhiza uralensis and Atractylodes macrocephala, and the mass ratio of Astragalus membranaceus, Taraxacum mongolicum, Glycyrrhiza uralensis and Atractylodes macrocephala is 3:2:1:1.

[0034] It should be further explained that Astragalus polysaccharides enhance the body's immunity and promote intestinal nutrient transport, dandelion polysaccharides exert anti-inflammatory and antibacterial effects to reduce intestinal inflammation, licorice polysaccharides harmonize the effects of the other herbs and protect the intestinal mucosal barrier, and Atractylodes macrocephala polysaccharides strengthen the spleen, promote digestion, and optimize intestinal metabolic function. This formula has the highest extraction efficiency of polysaccharide active ingredients and the most significant synergistic effect. It can create a healthy intestinal environment for calcium absorption, enhance the overall disease resistance of cattle, and reduce intestinal irritation. It complements the compound probiotics, calcium sources, and other ingredients, further amplifying the calcium supplementation effect and breeding benefits of the additive.

[0035] In this optional embodiment, the purity of calcium lactate is greater than or equal to 99%, and the purity of xylooligosaccharide is greater than or equal to 95%.

[0036] It should be further explained that the calcium lactate uses high-purity raw materials with a purity of ≥99%, ensuring precise and controllable effective calcium content and preventing impurities from affecting calcium absorption efficiency or causing adverse stimulation to the bovine intestines. This maximizes the advantages of organic calcium sources, such as superior biocompatibility and rapid absorption. Xylooligosaccharides are selected from high-purity products with a purity of ≥95%, ensuring a high proportion of active ingredients as probiotic growth factors. This reduces interference from ineffective impurities with the intestinal flora, more efficiently promoting the colonization and reproduction of compound probiotics and strengthening the intestinal microecological regulation effect. The selection of high-purity raw materials for both enhances the efficacy of the core components of the additives while ensuring the stability and safety of product quality, providing a fundamental guarantee for efficient calcium absorption and intestinal health.

[0037] According to another embodiment of the present invention, a method for preparing an additive that can improve the calcium content of cattle feed is also provided, the method comprising: S1. Weigh out the following components according to the preset weights: nano-calcium carbonate-chitosan composite microspheres, calcium lactate, calcium chelated modified diatomaceous earth, vitamin-cyclodextrin inclusion complex, compound probiotics, traditional Chinese medicine polysaccharide complex and xylooligosaccharide. S2. Weigh out the completed nano-calcium carbonate-chitosan composite microspheres, calcium lactate, calcium chelated modified diatomaceous earth and xylooligosaccharide, and add them sequentially into a double helix mixer. Stir at 400-500 rpm for 20-25 minutes to obtain a premix. S3. Cool the premix to 25-30℃ using a cooling device, and add vitamin-cyclodextrin inclusion complex, compound probiotics, and traditional Chinese medicine polysaccharide complex to the cooled premix in sequence, and stir at 250-300 rpm for 15-20 minutes. S4. During the mixing process, the moisture content of the material is monitored in real time by a humidity monitoring device. If the moisture content exceeds the preset threshold, the low-temperature drying device is activated for synchronous drying to ensure that the final moisture content of the material is less than or equal to 6% and a composite material is obtained. S5. The obtained composite material is fed into an ultra-fine pulverizing equipment for pulverization, and the pulverized composite material is then fed into a vibrating screen and graded through a 120-mesh standard sieve. The composite material that does not pass through the sieve is returned to the ultra-fine pulverizing equipment for re-pulverization until all of them pass through. S6. Collect the qualified composite material that passes the sieve, and encapsulate it in a sterile environment using sterile packaging materials to obtain the additive.

[0038] Example 1 (1) Raw material preparation: 20g of nano calcium carbonate-chitosan composite microspheres, 10g of calcium lactate, 14g of calcium chelated modified diatomaceous earth, 0.2g of vitamin-cyclodextrin inclusion complex, 4g of compound probiotics, 7g of traditional Chinese medicine polysaccharide complex, and 3g of xylooligosaccharide.

[0039] (2) Preparation method: Weigh each component according to the above weight; add nano-calcium carbonate-chitosan composite microspheres, calcium lactate, calcium chelated modified diatomaceous earth and xylooligosaccharide to a double helix mixer and stir at 450 rpm for 22 min to obtain a premix; cool the premix to 28°C using a cooling device, add vitamin-cyclodextrin inclusion complex, compound probiotics and traditional Chinese medicine polysaccharide complex to it in sequence, and stir at 280 rpm for 18 min; monitor the moisture content in real time during stirring, start the low temperature drying device to dry synchronously, and ensure that the final material moisture content is 5% to obtain a composite material; send the composite material to an ultra-micro pulverizer for pulverization, introduce it into a vibrating screener and classify it through a 120-mesh standard sieve, return the material on the sieve to be pulverized again until all of it passes; collect the qualified material under the sieve, and package it in a sterile environment with sterile packaging material to obtain the additive.

[0040] Example 2 (1) Raw material preparation: 15g of nano calcium carbonate-chitosan composite microspheres, 8g of calcium lactate, 10g of calcium chelated modified diatomaceous earth, 0.1g of vitamin-cyclodextrin inclusion complex, 3g of compound probiotics, 5g of traditional Chinese medicine polysaccharide complex, and 2g of xylooligosaccharide.

[0041] (2) Preparation method: Weigh each component according to the above weight; add nano-calcium carbonate-chitosan composite microspheres, calcium lactate, calcium chelated modified diatomaceous earth and xylooligosaccharide to a double helix mixer and stir at 400 rpm for 20 min to obtain a premix; cool the premix to 25°C using a cooling device, add vitamin-cyclodextrin inclusion complex, compound probiotics and traditional Chinese medicine polysaccharide complex to it in sequence, and stir at 250 rpm for 15 min; monitor the moisture content in real time during stirring, start the low temperature drying device to dry synchronously, and ensure that the final material moisture content is 4.5% to obtain a composite material; send the composite material to an ultra-micro pulverizer for pulverization, introduce it into a vibrating screener and classify it through a 120-mesh standard sieve, return the material on the sieve to be pulverized again until all of it passes; collect the qualified material under the sieve, and package it in a sterile environment with sterile packaging material to obtain the additive.

[0042] Example 3 (1) Raw material preparation: 25g of nano calcium carbonate-chitosan composite microspheres, 12g of calcium lactate, 18g of calcium chelated modified diatomaceous earth, 0.3g of vitamin-cyclodextrin inclusion complex, 6g of compound probiotics, 10g of traditional Chinese medicine polysaccharide complex, and 4g of xylooligosaccharide.

[0043] (2) Preparation method: Weigh each component according to the above weight; add nano-calcium carbonate-chitosan composite microspheres, calcium lactate, calcium chelated modified diatomaceous earth and xylooligosaccharide to a double helix mixer and stir at 500 rpm for 25 min to obtain a premix; cool the premix to 30°C using a cooling device, add vitamin-cyclodextrin inclusion complex, compound probiotics and traditional Chinese medicine polysaccharide complex to it in sequence, and stir at 300 rpm for 20 min; monitor the moisture content in real time during stirring, start the low temperature drying device to dry synchronously, and ensure that the final material moisture content is 6% to obtain a composite material; send the composite material to an ultra-micro pulverizer for pulverization, introduce it into a vibrating screener and classify it through a 120-mesh standard sieve, return the material on the sieve to be pulverized again until all of it passes; collect the qualified material under the sieve, and package it in a sterile environment with sterile packaging material to obtain the additive.

[0044] Example 4 (1) Raw material preparation: 18g of nano calcium carbonate-chitosan composite microspheres, 9g of calcium lactate, 12g of calcium chelated modified diatomaceous earth, 0.15g of vitamin-cyclodextrin inclusion complex, 5g of compound probiotics, 8g of traditional Chinese medicine polysaccharide complex, and 2.5g of xylooligosaccharide.

[0045] (2) Preparation method: Weigh each component according to the above weight; add nano-calcium carbonate-chitosan composite microspheres, calcium lactate, calcium chelated modified diatomaceous earth and xylooligosaccharide to a double helix mixer and stir at 420 rpm for 23 min to obtain a premix; cool the premix to 27°C using a cooling device, add vitamin-cyclodextrin inclusion complex, compound probiotics and traditional Chinese medicine polysaccharide complex to it in sequence, and stir at 260 rpm for 17 min; monitor the moisture content in real time during stirring, start the low temperature drying device to dry synchronously, and ensure that the final material moisture content is 5.2% to obtain a composite material; send the composite material to an ultra-micro pulverizer for pulverization, introduce it into a vibrating screener and classify it through a 120-mesh standard sieve, return the material on the sieve to be pulverized again until all of it passes; collect the qualified material under the sieve, and package it in a sterile environment with sterile packaging material to obtain the additive.

[0046] Comparative Example 1 (1) Raw material preparation: 30g of nano calcium carbonate-chitosan composite microspheres, 6g of calcium lactate, 8g of calcium chelated modified diatomaceous earth, 0.05g of vitamin-cyclodextrin inclusion complex, 2g of compound probiotics, 4g of traditional Chinese medicine polysaccharide complex, and 1g of xylooligosaccharide.

[0047] (2) Preparation method: Weigh each component according to the above weight; add nano-calcium carbonate-chitosan composite microspheres, calcium lactate, calcium chelated modified diatomaceous earth and xylooligosaccharide to a double helix mixer and stir at 600 rpm for 15 min to obtain a premix; cool the premix to 20°C using a cooling device, add vitamin-cyclodextrin inclusion complex, compound probiotics and traditional Chinese medicine polysaccharide complex to it in sequence, and stir at 350 rpm for 10 min; during the stirring process, synchronous drying was not started, and the final moisture content of the material was 8% to obtain a composite material; send the composite material to an ultra-micro pulverizer for pulverization, and introduce it into a vibrating screener for grading and screening through a 100-mesh standard sieve, and discard the material on the sieve directly; collect the material under the sieve and package it in a normal environment with conventional packaging materials to obtain the additive.

[0048] Table 1 Performance Comparison of Each Example and Comparative Example

[0049] As shown in Table 1, the calcium bioavailability of cattle feed provided in Examples 1-4 was higher than 78%, the blood calcium concentration of calves was higher than 2.83 mmol / L, the daily weight gain of fattening cattle was higher than 1.65 kg / d, the milk production of dairy cows was higher than 32.6 kg / d, and the number of beneficial bacteria in the intestine was higher than 10.1 log CFU / g. A comparison between Comparative Example 1 and Examples 1-4 revealed that all performance indicators of Comparative Example 1 were significantly lower than those of Examples 1-4. The calcium supplementation effect of this additive and its improvement on cattle growth and production performance depend on the rational control of raw material components, proportions, and preparation process parameters. Therefore, the calcium-enhancing additive provided by this invention can effectively improve calcium bioavailability, improve cattle growth and production performance, and optimize the intestinal microecological environment, making it a high-performance calcium additive for cattle feed.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An additive that can increase the calcium content of cattle feed, characterized in that, The additive comprises the following components in parts by weight: 15-25 parts of nano-calcium carbonate-chitosan composite microspheres; 8-12 parts of calcium lactate; 10-18 parts of calcium-chelated modified diatomaceous earth; Vitamin-cyclodextrin inclusion complex 0.1-0.3 parts; 3-6 servings of compound probiotics; 5-10 parts of traditional Chinese medicine polysaccharide complex; 2-4 parts xylooligosaccharides.

2. The additive for increasing calcium content in cattle feed according to claim 1, characterized in that, The nano-calcium carbonate-chitosan composite microspheres comprise nano-calcium carbonate and chitosan, wherein the mass ratio of the nano-calcium carbonate to the chitosan is 1:(0.3-0.5).

3. The additive for increasing calcium content in cattle feed according to claim 2, characterized in that, The particle size of the nano-calcium carbonate-chitosan composite microspheres is 1-5 μm.

4. The additive for increasing calcium content in cattle feed according to claim 1, characterized in that, The calcium chelated modified diatomite comprises activated diatomite and calcium chloride, wherein the mass ratio of activated diatomite to calcium chloride is 1:(0.2-0.3).

5. The additive for increasing calcium content in cattle feed according to claim 4, characterized in that, The calcium loading of the calcium-chelated modified diatomaceous earth is greater than or equal to 120 mg / g.

6. The additive for increasing calcium content in cattle feed according to claim 1, characterized in that, The vitamin-cyclodextrin inclusion complex comprises vitamin D3 and β-cyclodextrin, and the mass ratio of vitamin D3 to β-cyclodextrin is 1:(10-15).

7. The additive for increasing calcium content in cattle feed according to claim 1, characterized in that, The compound probiotics include: Lactobacillus plantarum, Lactobacillus casei, and Rhodopseudomonas palustris, and the mass ratio of Lactobacillus plantarum, Lactobacillus casei, and Rhodopseudomonas palustris is 1:1.2:

1.

8. The additive for increasing calcium content in cattle feed according to claim 1, characterized in that, The herbal polysaccharide complex includes: Astragalus membranaceus, Taraxacum mongolicum, Glycyrrhiza uralensis and Atractylodes macrocephala, and the mass ratio of Astragalus membranaceus, Taraxacum mongolicum, Glycyrrhiza uralensis and Atractylodes macrocephala is 3:2:1:

1.

9. An additive for increasing calcium content in cattle feed according to claim 1, characterized in that, The purity of the calcium lactate is greater than or equal to 99%, and the purity of the xylooligosaccharide is greater than or equal to 95%.

10. A method for preparing an additive that can improve the calcium content of cattle feed, used to achieve the preparation of the additive that can improve the calcium content of cattle feed according to any one of claims 1-9, characterized in that, The preparation method includes: S1. Weigh out the following components according to the preset weights: nano-calcium carbonate-chitosan composite microspheres, calcium lactate, calcium chelated modified diatomaceous earth, vitamin-cyclodextrin inclusion complex, compound probiotics, traditional Chinese medicine polysaccharide complex and xylooligosaccharide. S2. Weigh out the completed nano-calcium carbonate-chitosan composite microspheres, calcium lactate, calcium chelated modified diatomaceous earth and xylooligosaccharide, and add them sequentially into a double helix mixer. Stir at 400-500 rpm for 20-25 minutes to obtain a premix. S3. Cool the premix to 25-30℃ using a cooling device, and add vitamin-cyclodextrin inclusion complex, compound probiotics, and traditional Chinese medicine polysaccharide complex to the cooled premix in sequence, and stir at 250-300 rpm for 15-20 minutes. S4. During the mixing process, the moisture content of the material is monitored in real time by a humidity monitoring device. If the moisture content exceeds the preset threshold, the low-temperature drying device is activated for synchronous drying to ensure that the final moisture content of the material is less than or equal to 6% and a composite material is obtained. S5. The obtained composite material is fed into an ultra-fine pulverizing equipment for pulverization, and the pulverized composite material is then fed into a vibrating screen and graded through a 120-mesh standard sieve. The composite material that does not pass through the sieve is returned to the ultra-fine pulverizing equipment for re-pulverization until all of them pass through. S6. Collect the qualified composite material that passes the sieve, and encapsulate it in a sterile environment using sterile packaging materials to obtain the additive.

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