Basic magnesium sulfate cement cattle and sheep lick brick and preparation method thereof

Abstract

The invention discloses a basic magnesium sulfate cement cattle and sheep lick brick and a preparation method thereof, and belongs to the technical field of animal feeds, the basic magnesium sulfate cement cattle and sheep lick brick comprises the following components by mass: 30-40% of basic magnesium sulfate cement, 20-30% of salt, 10-15% of honey, 5-10% of starch, 5-10% of corncob, 5-10% of bentonite, 0.1-0.3% of feed-grade copper sulfate, 0.03-0.06% of feed-grade cobalt chloride, and the balance of water. 0.2 to 0.3% of feed-grade manganese sulfate; and 0.1 to 0.3% of feed-grade basic zinc chloride. Wherein the basic magnesium sulfate cement is prepared from magnesium oxide, feed-grade magnesium sulfate and aminosalicylic acid. According to the invention, basic stability of the lick brick is ensured, the lick brick is endowed with the ability of gradually disintegrating and releasing trace elements in the licking process of cattle and sheep, the trace elements are released quickly, high requirements of cattle and sheep on the trace elements in the stages of growth, reproduction, stress and the like can be met, and the quality of the cattle and sheep is improved. The problems of slow growth, low immunity, reproductive disorder and the like caused by lack of trace elements are effectively prevented.

Description

Technical Field

[0001] The invention belongs to the technical field of animal feed and relates to a basic magnesium sulfate cement cattle and sheep lick brick and a preparation method thereof. Background Art

[0002] Ruminants, such as cattle and sheep, require a vital supply of trace elements during their growth. These trace elements (such as cobalt, copper, zinc, and manganese) are involved in regulating the activity and metabolism of multiple enzymes in the animals, playing a crucial role in improving production performance, enhancing immunity, and promoting reproduction. However, the mineral content of soil and forage in natural grazing environments is limited, making it difficult to meet the trace element needs of cattle and sheep. This is especially true in specific areas, such as high-altitude, arid, or saline-alkali lands, where insufficient trace elements in the soil are particularly serious.

[0003] To address these deficiencies, lick bricks are widely used as a feed additive to supplement trace elements. Invention patent application (201210081979.0) discloses a mineral-composite lick brick for cattle and sheep and its preparation method. Zinc sulfate, copper sulfate, ferrous sulfate, manganese sulfate, cobalt chloride, potassium iodide, sodium selenite, magnesium sulfate, sodium sulfate, calcium sulfate, calcium hydrogen sulfate, and sodium chloride are mixed and stirred in appropriate proportions, then pressed and formed. Composed of 100% inorganic salts, the lick brick easily deliquesces and pulverizes in air, resulting in a short shelf life. The invention patent application (202311752029.0) discloses a nutritionally balanced composite cattle and sheep lick brick and its preparation process. Urea-formaldehyde resin, silicate cement and quicklime are used as adhesives to bond molasses powder, bran, urea, salt, mineral element additives and vitamins into a bonded shape. Although the shortcomings of the lick bricks, such as short storage period and easy deliquesce and powderization, are overcome, urea-formaldehyde resin cannot be degraded in the gastric acid of cattle and sheep, and silicate cement or quicklime, due to their high alkalinity, will damage the gastrointestinal digestive system of cattle and sheep, leading to a decrease in their immunity.

[0004] These traditional lick bricks also face the technical challenge of slow trace element release in practical applications. The slow release rate of trace elements in traditional lick bricks makes it difficult to quickly meet the high trace element demands of cattle and sheep, especially during peak growth, reproductive periods, or under stress. Furthermore, the overemphasis on structural stability often leads to reduced licking efficiency, insufficient element release, and an inability to achieve controlled release according to the animal's physiological rhythms. Therefore, ensuring the basic stability of the lick bricks while also enabling them to gradually disintegrate and release trace elements during the licking process is a key issue that urgently needs to be addressed. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a basic magnesium sulfate cement cattle and sheep lick brick and a preparation method thereof in view of the above-mentioned existing deficiencies.

[0006] In order to achieve the above technical objectives, the technical solution adopted by the present invention is:

[0007] The invention relates to a basic magnesium sulfate cement cattle and sheep licking brick, which adopts basic magnesium sulfate cement as a cementing material. The basic magnesium sulfate cement is composed of magnesium oxide, feed-grade magnesium sulfate and aminosalicylic acid.

[0008] Furthermore, the cattle and sheep licking brick also includes the following components: table salt, honey, starch, corn cobs, bentonite, feed grade copper sulfate, feed grade cobalt chloride, feed grade manganese sulfate and feed grade basic zinc chloride.

[0009] Furthermore, the mass percentages of the components of the cattle and sheep licking bricks are: 30-40% basic magnesium sulfate cement, 20-30% table salt, 10-15% honey, 5-10% starch, 5-10% corn cobs, 5-10% bentonite, 0.1-0.3% feed-grade copper sulfate, 0.03-0.06% feed-grade cobalt chloride, 0.2-0.3% feed-grade manganese sulfate, and 0.1-0.3% feed-grade basic zinc chloride.

[0010] Furthermore, the molar ratio of magnesium oxide to feed-grade magnesium sulfate in the basic magnesium sulfate cement is 3:1-8:1, and the amount of aminosalicylic acid used is 0.1%-0.5% of the mass percentage of magnesium oxide.

[0011] Furthermore, the magnesium oxide is low-activity magnesium oxide obtained by calcining magnesite at 1000-1200°C.

[0012] Furthermore, the starch is any one or more mixtures of potato starch, sweet potato starch, wheat starch and corn starch.

[0013] Furthermore, the corn cob is a dried corn cob particle, and the particle size of the corn cob particle is between 0.5-2.0 mm.

[0014] Furthermore, the feed-grade copper sulfate is any one of copper sulfate monohydrate and copper sulfate pentahydrate, or a mixture of the two.

[0015] The preparation method of basic magnesium sulfate cement cattle and sheep lick bricks is used to prepare the basic magnesium sulfate cement cattle and sheep lick bricks, comprising the following steps:

[0016] Step 1: Prepare feed-grade magnesium sulfate and aminosalicylic acid into an aqueous solution, and then stir them together with light-burned magnesium oxide powder to form a uniform basic magnesium sulfate cement slurry;

[0017] Step 2: mixing feed-grade copper sulfate, feed-grade cobalt chloride, feed-grade manganese sulfate, feed-grade basic zinc chloride and honey into basic magnesium sulfate cement slurry and stirring to prepare basic magnesium sulfate cement slurry containing trace elements;

[0018] Step 3: Add salt, bentonite, starch and corn cobs to the basic magnesium sulfate cement slurry prepared in step 2, and stir to form a mixture for cattle and sheep licking bricks;

[0019] Step 4: Let the cattle and sheep lick brick mixture stand and hydrate;

[0020] Step 5: Press the cattle and sheep lick brick mixture after standing in a brick-making machine to form brick embryos, and cure them in a natural environment to make cattle and sheep lick bricks.

[0021] In step 2, feed-grade copper sulfate, feed-grade cobalt chloride, feed-grade manganese sulfate, feed-grade basic zinc chloride and honey are mixed into basic magnesium sulfate cement slurry, and stirred at a speed of 50-100 r / min for 2-6 minutes. In step 3, salt, bentonite, starch and corn cobs are added to the basic magnesium sulfate cement slurry prepared in step 2, and stirred at a speed of 80-150 r / min for 3-10 minutes. In step 4, the cattle and sheep lick brick mixture is allowed to stand in a silo for hydration for 6-24 hours. In step 5, the brick embryos are cured in a natural environment for 3-14 days.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The basic magnesium sulfate cement cattle and sheep lick brick of the present invention adopts basic magnesium sulfate cement as a binder material, and basic magnesium sulfate cement is composed of magnesium oxide, feed-grade magnesium sulfate and aminosalicylic acid. On the one hand, magnesium oxide is added to the lick brick to regulate the formation of hydration products. Magnesium oxide, especially low-activity magnesium oxide, can inhibit the formation of 5·1·7 crystal phase (5Mg(OH)2·MgSO4·7H2O), so that the hydration product is mainly magnesium hydroxide (Mg(OH)2). The volume expansion of magnesium hydroxide will destroy the structure of the lick brick, causing it to gradually disintegrate when cattle and sheep lick it, thereby promoting the release of trace elements such as copper, manganese, cobalt, and zinc. On the other hand, aminosalicylic acid is added to the lick brick to regulate the formation of the crystal phase. Aminosalicylic acid chelates magnesium ions, causing some magnesium ions to undergo substitution in the crystal lattice, resulting in crystal phase distortion and reducing the structural stability of the lick brick. During the licking process of cattle and sheep, the lick brick is further disintegrated under the influence of physiological body fluids, thereby achieving the sustained release of trace elements.

[0024] 2. The present invention adds feed-grade copper sulfate, feed-grade cobalt chloride, feed-grade manganese sulfate and feed-grade basic zinc chloride to the lick brick, and cooperates with basic magnesium sulfate cement to achieve rapid release of trace elements, quickly meet the high demand of cattle and sheep for trace elements in the growth, reproduction and stress stages, and effectively prevent problems such as growth retardation, low immunity and reproductive disorders caused by trace element deficiency.

[0025] 3. By adding ingredients such as corncob powder and honey, the present invention significantly improves the roughness and palatability of the lick brick. The corncob increases the friction of the lick brick, making it easier for cattle and sheep to lick it. The honey imparts a certain sweetness to the lick brick, increasing their interest in licking the brick, thereby increasing the frequency and intake of licking and ensuring the effective replenishment of trace elements.

[0026] 4. Licking bricks can be naturally degraded after use, without pollution to the environment, and in line with environmental protection requirements. This not only reduces the cost of processing aquaculture waste, but also avoids the pollution of soil and water sources that traditional licking bricks may cause, with good ecological benefits.

[0027] 5. The shape of the lick brick can be designed into various shapes according to the breeding environment and the licking habits of cattle and sheep, such as cylindrical, rectangular or irregular shapes. It can be deployed flexibly, which improves its applicability in different breeding scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a flow chart for preparing cattle and sheep licking bricks of the present invention;

[0029] Figure 2 This is the dissolution diagram of trace elements copper, manganese, cobalt and zinc. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of this application more clearly understood, the present application is described and illustrated below in conjunction with the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely used to explain this application and are not intended to limit this application. Based on the embodiments provided in this application, all other embodiments obtained by those of ordinary skill in the art without making any creative efforts are within the scope of protection of this application.

[0031] The basic magnesium sulfate cement cattle and sheep lick brick of the present invention comprises the following components by mass percentage: 30-40% basic magnesium sulfate cement, 20-30% salt, 10-15% honey, 5-10% starch, 5-10% corn cobs, 5-10% bentonite, 0.1-0.3% feed-grade copper sulfate, 0.03-0.06% feed-grade cobalt chloride, 0.2-0.3% feed-grade manganese sulfate, and 0.1-0.3% feed-grade basic zinc chloride. The basic magnesium sulfate cement comprises magnesium oxide, feed-grade magnesium sulfate, and aminosalicylic acid.

[0032] The present invention also provides a method for preparing basic magnesium sulfate cement cattle and sheep lick bricks, such as Figure 1 As shown, specifically including:

[0033] Step 1: Prepare feed-grade magnesium sulfate and aminosalicylic acid into an aqueous solution, and then stir them together with light-burned magnesium oxide powder to form a uniform basic magnesium sulfate cement slurry;

[0034] Step 2: Mix feed-grade copper sulfate, feed-grade cobalt chloride, feed-grade manganese sulfate, feed-grade basic zinc chloride and honey into basic magnesium sulfate cement slurry, stir at a speed of 50-100 r / min for 2-6 minutes to fully dissolve the trace element reagent, and prepare basic magnesium sulfate cement slurry containing trace element components;

[0035] Step 3: Add salt, bentonite, starch and corn cobs to the slurry of step 2, continue stirring at high speed for 3-10 minutes, and the mixer speed is 80-150r / min to prepare a mixture for cattle and sheep licking bricks;

[0036] Step 4: Let the prepared cattle and sheep lick brick mixture stand in the silo for 6-24 hours;

[0037] Step 5: Press the cattle and sheep lick brick mixture after standing in a brick making machine to form brick embryos, and cure them in a natural environment for 3-14 days to make cattle and sheep lick bricks.

[0038] The molar ratio of magnesium oxide to magnesium sulfate in the basic magnesium sulfate cement is 3-8, and the amount of aminosalicylic acid used is 0.1%-0.5% of the magnesium oxide.

[0039] The magnesium oxide is low-activity magnesium oxide, which is a product of calcining magnesite at 1000-1200° C., and has an active magnesium oxide content of 35%-55%.

[0040] The corn cob is a dried corn cob particle with a particle size controlled at 0.5-2.0 mm to increase the roughness of the lick brick surface and enhance the palatability of cattle and sheep.

[0041] The starch is any one or more mixtures of potato starch, sweet potato starch, wheat starch and corn starch.

[0042] Feed grade copper sulfate is either copper sulfate monohydrate or copper sulfate pentahydrate or a mixture of the two.

[0043] The shape of the lick brick can be designed to be cylindrical, rectangular or irregular to adapt to different breeding environments and the licking habits of cattle and sheep.

[0044] Basic magnesium sulfate cement cattle and sheep lick bricks are easy to lick, and the trace elements are easily soluble. They are suitable for cattle and sheep, can improve immunity, and are non-toxic and harmless. After use, cattle and sheep can excrete naturally, without polluting the environment, and meet environmental protection requirements.

[0045] The present invention is explained below with specific embodiments:

[0046] Example 1:

[0047] This embodiment provides basic magnesium sulfate cement cattle and sheep lick bricks, which include, by mass percentage:

[0048] Basic magnesium sulfate cement 35%, salt 30%, honey 10%, starch 5%, corn cob 10%, bentonite 9.34%, feed grade copper sulfate 0.25%, feed grade cobalt chloride 0.03%, feed grade manganese sulfate 0.2%, feed grade basic zinc chloride 0.18%;

[0049] Magnesium sulfate cement is composed of magnesium oxide, feed-grade magnesium sulfate, and aminosalicylic acid. The molar ratio of magnesium oxide to magnesium sulfate is 3, and the amount of aminosalicylic acid is 0.1% of the magnesium oxide. The magnesium oxide is low-activity magnesium oxide, a product calcined at 1000°C by magnesia ore, with an active magnesium oxide content of 35%.

[0050] The preparation method of the lick brick includes:

[0051] Step 1: Prepare feed-grade magnesium sulfate and aminosalicylic acid into an aqueous solution, and then stir with magnesium oxide powder to form a uniform basic magnesium sulfate cement slurry;

[0052] Step 2: Mix feed-grade copper sulfate, feed-grade cobalt chloride, feed-grade manganese sulfate, feed-grade basic zinc chloride and honey into basic magnesium sulfate cement slurry, stir at a speed of 50-100 r / min for 2-6 minutes to fully dissolve the trace element reagent, and prepare basic magnesium sulfate cement slurry containing trace element components;

[0053] Step 3: Add salt, bentonite, starch and corn cobs to the slurry of step 2, continue stirring at high speed for 3-10 minutes, and the mixer speed is 80-150r / min to prepare a mixture for cattle and sheep licking bricks;

[0054] Step 4: Let the prepared cattle and sheep lick brick mixture stand in the silo for 6-24 hours;

[0055] Step 5: Press the cattle and sheep lick brick mixture after standing in a brick making machine to form brick embryos, and cure them in a natural environment for 3-14 days to make cattle and sheep lick bricks.

[0056] A release test method simulating the licking environment of cattle and sheep was used. The lick brick samples were placed in a simulated saliva solution (pH 6.5, containing 0.1 mol / L NaCl and 0.01 mol / L CaCl2). Samples were taken out after 24 hours, 48 hours and 72 hours, and the dissolution amounts of copper, manganese, cobalt and zinc in the solution were measured. The test results are shown in Table 1.

[0057] Examples 2 and 3

[0058] This embodiment provides a cattle and sheep lick brick, the composition and preparation method of which are basically the same as those in Example 1, except that low-activity magnesium oxide is used as magnesium oxide, and the calcined product of magnesite at 1100°C and 1200°C is used. Please see Table 1 for details.

[0059] Comparative Examples 1, 2, and 3

[0060] This embodiment provides a cattle and sheep lick brick, the composition and preparation method of which are basically the same as those in Example 1, with the only difference being that high-activity magnesium oxide is used as magnesium oxide, and the calcined products of magnesite at 700°C, 800°C and 900°C are used. Please see Table 1 for details.

[0061] Example 4

[0062] This embodiment provides basic magnesium sulfate cement cattle and sheep lick bricks, which include, by mass percentage:

[0063] Basic magnesium sulfate cement 35%, salt 30%, honey 10%, starch 5%, corn cob 10%, bentonite 9.34%, feed grade copper sulfate 0.25%, feed grade cobalt chloride 0.03%, feed grade manganese sulfate 0.2%, feed grade basic zinc chloride 0.18%;

[0064] Magnesium sulfate cement is composed of magnesium oxide, feed-grade magnesium sulfate, and aminosalicylic acid. The molar ratio of magnesium oxide to magnesium sulfate is 3, and the amount of aminosalicylic acid is 0.1% of the magnesium oxide. The magnesium oxide is low-activity magnesium oxide, a product of calcining magnesite at 1000°C, with an active magnesium oxide content of 40%.

[0065] A release test method simulating the licking environment of cattle and sheep was used. The lick brick samples were placed in a simulated saliva solution (pH 6.5, containing 0.1 mol / L NaCl and 0.01 mol / L CaCl2). Samples were taken out after 24 hours, 48 hours and 72 hours, and the dissolution amounts of copper, manganese, cobalt and zinc in the solution were measured. The test results are shown in Table 2.

[0066] The rest is the same as Example 1.

[0067] Examples 5, 6, and 7

[0068] This embodiment provides a cattle and sheep licking brick, the composition and preparation method of which are basically the same as those of Example 4, with the only difference being that low-activity magnesium oxide is used as magnesium oxide, and the active magnesium oxide content is 45%, 50% and 55%. Please see Table 2 for details.

[0069] Example 8

[0070] This embodiment provides basic magnesium sulfate cement cattle and sheep lick bricks, which include, by mass percentage:

[0071] Basic magnesium sulfate cement 35%, salt 30%, honey 10%, starch 5%, corn cob 10%, bentonite 9.34%, feed grade copper sulfate 0.25%, feed grade cobalt chloride 0.03%, feed grade manganese sulfate 0.2%, feed grade basic zinc chloride 0.18%;

[0072] Magnesium sulfate cement is composed of magnesium oxide, feed-grade magnesium sulfate, and aminosalicylic acid. The molar ratio of magnesium oxide to magnesium sulfate is 4, and the amount of aminosalicylic acid is 0.1% of the magnesium oxide. The magnesium oxide is low-activity magnesium oxide, a product calcined at 1000°C by magnesia ore, with an active magnesium oxide content of 40%.

[0073] A release test method simulating the licking environment of cattle and sheep was used. The lick brick samples were placed in a simulated saliva solution (pH 6.5, containing 0.1 mol / L NaCl and 0.01 mol / L CaCl2). Samples were taken out after 24 hours, 48 hours and 72 hours, and the dissolution amounts of copper, manganese, cobalt and zinc in the solution were measured. The test results are shown in Table 3.

[0074] The rest is the same as Example 1.

[0075] Examples 9, 10, 11, and 12

[0076] This embodiment provides a cattle and sheep lick brick, the composition and preparation method of which are basically the same as those of Example 4, except that the molar ratio of magnesium oxide to magnesium sulfate in the basic magnesium sulfate cement is 5, 6, 7, and 8. Please see Table 3 for details.

[0077] Example 13

[0078] This embodiment provides basic magnesium sulfate cement cattle and sheep lick bricks, which include, by mass percentage:

[0079] Basic magnesium sulfate cement 35%, salt 30%, honey 10%, starch 5%, corn cob 10%, bentonite 9.34%, feed grade copper sulfate 0.25%, feed grade cobalt chloride 0.03%, feed grade manganese sulfate 0.2%, feed grade basic zinc chloride 0.18%;

[0080] Magnesium sulfate cement is composed of magnesium oxide, feed-grade magnesium sulfate, and aminosalicylic acid. The molar ratio of magnesium oxide to magnesium sulfate is 8, and the amount of aminosalicylic acid is 0.2% of the magnesium oxide. The magnesium oxide is low-activity magnesium oxide, a product calcined at 1000°C by magnesia ore, with an active magnesium oxide content of 35%.

[0081] A release test method simulating the licking environment of cattle and sheep was used. The lick brick samples were placed in a simulated saliva solution (pH 6.5, containing 0.1 mol / L NaCl and 0.01 mol / L CaCl2). Samples were taken out after 24 hours, 48 hours and 72 hours, and the dissolution amounts of copper, manganese, cobalt and zinc in the solution were measured. The test results are shown in Table 4.

[0082] The rest is the same as Example 1.

[0083] Examples 14, 15, and 16

[0084] This embodiment provides a cattle and sheep lick brick, the composition and preparation method of which are basically the same as those of Example 13, with the only difference being that the amount of aminosalicylic acid in the basic magnesium sulfate cement is 0.3%, 0.4% and 0.5% of magnesium oxide. Please see Table 4 for details.

[0085] Table 1 Effect of different activated magnesium oxides on the dissolution of trace elements in lick bricks

[0086]

[0087]

[0088] Table 2 Effect of different active magnesium oxide contents on the dissolution of trace elements in lick bricks

[0089]

[0090]

[0091] Table 3 Effect of the molar ratio of magnesium oxide to magnesium sulfate on the dissolution of trace elements in lick bricks

[0092]

[0093]

[0094] Table 4 Effect of different aminosalicylic acid dosages on the dissolution of trace elements in lick bricks

[0095]

[0096]

[0097] In summary, the basic magnesium sulfate cement cattle and sheep lick brick and its preparation method of the present invention effectively solve the problems of uncontrollable release of trace elements and slow decomposition of lick bricks in traditional lick bricks. By incorporating low-activity magnesium oxide and optimizing the dosage of aminosalicylic acid to control the structure of the hydration product, the copper (Cu 2+ ), manganese (Mn 2+ ), cobalt (Co 2+ ) and zinc (Zn 2+ ) and other essential trace elements to ensure the nutritional needs of cattle and sheep at different growth stages. This invention provides a new approach to the research and development of cattle and sheep lick bricks and is expected to be promoted and applied in large-scale breeding, improving the nutritional management level and economic benefits of animal husbandry.

[0098] The above embodiments are preferred implementations of the present invention, but the implementation of the present invention is not limited to the embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A basic magnesium sulfate cement cattle and sheep licking brick, characterized in that: Basic magnesium sulfate cement is used as a cementing material, and the basic magnesium sulfate cement consists of magnesium oxide, feed-grade magnesium sulfate and aminosalicylic acid.

2. A basic magnesium sulfate cement cattle and sheep licking brick according to claim 1, characterized in that: The cattle and sheep lick bricks also include the following ingredients: table salt, honey, starch, corn cobs, bentonite, feed grade copper sulfate, feed grade cobalt chloride, feed grade manganese sulfate and feed grade basic zinc chloride.

3. A basic magnesium sulfate cement cattle and sheep licking brick according to claim 2, characterized in that: The mass percentage of the components of the cattle and sheep lick bricks are: basic magnesium sulfate cement 30-40%, table salt 20-30%, honey 10-15%, starch 5-10%, corn cobs 5-10%, bentonite 5-10%, feed grade copper sulfate 0.1-0.3%, feed grade cobalt chloride 0.03-0.06%, feed grade manganese sulfate 0.2-0.3%, and feed grade basic zinc chloride 0.1-0.3%.

4. A basic magnesium sulfate cement cattle and sheep licking brick according to claim 3, characterized in that: The molar ratio of magnesium oxide to feed-grade magnesium sulfate in the basic magnesium sulfate cement is 3:1-8:1, and the amount of aminosalicylic acid used is 0.1%-0.5% of the mass percentage of magnesium oxide.

5. The basic magnesium sulfate cement cattle and sheep licking brick according to claim 3, characterized in that: The magnesium oxide is low-activity magnesium oxide obtained by calcining magnesite at 1000-1200°C.

6. A basic magnesium sulfate cement cattle and sheep licking brick according to claim 3, characterized in that: The starch is any one or more mixtures of potato starch, sweet potato starch, wheat starch and corn starch.

7. The basic magnesium sulfate cement cattle and sheep licking brick according to claim 3, characterized in that: The corn cob is a dried corn cob particle, and the particle size of the corn cob particle is between 0.5 and 2.0 mm.

8. The basic magnesium sulfate cement cattle and sheep licking brick according to claim 3, characterized in that: The feed-grade copper sulfate is any one of copper sulfate monohydrate and copper sulfate pentahydrate or a mixture of the two.

9. A method for preparing basic magnesium sulfate cement cattle and sheep licking bricks, characterized by: The method for preparing the basic magnesium sulfate cement cattle and sheep licking brick according to claim 2 comprises the following steps: Step 1: Prepare feed-grade magnesium sulfate and aminosalicylic acid into an aqueous solution, and then stir them together with light-burned magnesium oxide powder to form a uniform basic magnesium sulfate cement slurry; Step 2: mixing feed-grade copper sulfate, feed-grade cobalt chloride, feed-grade manganese sulfate, feed-grade basic zinc chloride and honey into basic magnesium sulfate cement slurry and stirring to prepare basic magnesium sulfate cement slurry containing trace elements; Step 3: Add salt, bentonite, starch and corn cobs to the basic magnesium sulfate cement slurry prepared in step 2, and stir to form a mixture for cattle and sheep licking bricks; Step 4: Let the cattle and sheep lick brick mixture stand and hydrate; Step 5: Press the cattle and sheep lick brick mixture after standing in a brick-making machine to form brick embryos, and cure them in a natural environment to make cattle and sheep lick bricks.

10. The method for preparing the basic magnesium sulfate cement cattle and sheep licking brick according to claim 9, characterized in that: In step 2, feed-grade copper sulfate, feed-grade cobalt chloride, feed-grade manganese sulfate, feed-grade basic zinc chloride and honey are mixed into basic magnesium sulfate cement slurry, and stirred at a speed of 50-100 r / min for 2-6 minutes. In step 3, salt, bentonite, starch and corn cobs are added to the basic magnesium sulfate cement slurry prepared in step 2, and stirred at a speed of 80-150 r / min for 3-10 minutes. In step 4, the cattle and sheep lick brick mixture is allowed to stand in a silo for hydration for 6-24 hours. In step 5, the brick embryos are cured in a natural environment for 3-14 days.

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