TRADITIONAL CHINESE MEDICINE COMPOSITION FOR TREATMENT OF DAIRY COW IAMINITIS AND PREPARATION METHOD THEREOF FIELD OF THE INVENTION [0001] The invention relates to the field of animal medicines, and in particular, to a traditional Chinese medicine composition-for treatment of dairy-cow-laminitis and-apreparation method thereof. BACKGROUND OF THE INVENTION [00021 Digcstivc disorder results from feeding of high-carbohydrate fecdstuff and long-term feeding of high-protein feedstuff during dairy cow raising. and will lead to laminitis. Laminitis that has considerable harm could arouse loss of appetite, decrease of milk yield, sweating, muscle tremor, hoof coronet tremor, pain during hoof wall percussion, and even the incapability of standing in some severe cases, thus eventually causing the death of dairy cows and further creating economic loss of raisers. [0003] Nowadays, oral administration or injection methods of antibiotics, hormones, chemical drugs and the like, are used for the treatment of dairy cow lam initis by most or the raisers, and massive use of the above drugs, though fast in effect, could generate toxic and side effects, allergy, double infection, drug resistance and other harms. Massive use of the antibiotics could result in drug resistance in a large amount of bacteria, which are subsequently turned into drug-resistant strains. For dairy cows to which antibiotics and other drugs are administered, there is severe drug residue in their byproduct milk, affecting milk quality negatively and threatening human health. [00041 Some raisers clean the sensitive laminae of hoof with externally-applied drugs, and such a method can achieve direct contact with lesions, but it is complex in use and 1 RECEIVED TIME 21. JUN. 14:28 fails to root out the disease, in addition, lesions could be enlarged due to the problem of poor skill in the process of cleaning, as a result, curative rate is reduced. SUMMARY OF TIHE INVENTION [0005] An objective of the invention is to provide a traditional Chinese medicine composition for the treatment of dairy cow laminitis, which has the efficacies of removal of heat and toxic substances, bacteria resistance and anti-inflammation, invigoration of blood circulation and pain relieving, and stomach strengthening and digestion promotion, and which is free from drug residue and convenient to use. [0006] Another objective of the invention is to provide a preparation method of the traditional Chinese medicine composition for the treatment of dairy cow laminitis. [0007] The invention is implemented mainly by the technical proposal below: [0008] A traditional Chinese medicine composition for the treatment of dairy cow laminitis, wherein the traditional Chinese medicine composition comprises the components in parts by weight as below: [0009] rhizoma coptidis 20-25 parts; [0010] airpotato yam 15-20 parts; [0011] andrographis paniculata 15-25 parts; [0012] forsythia suspense 10-18 parts; [0013] carthamus tinctorius linne 10-15 parts; [0014] balloon flower 10-15 parts; [0015] garlic 15-20 parts; and [00161 hawthorn 15-25 parts. 2 RECEIVED TIME 21. JUN. 14:28 [00171 Further, the traditional Chinese medicine composition comprises the components in the best parts by weight as below: [0018] rhizoma coptidis 23 parts; [0019] airpotato yam 18 parts; [0020] andrographis paniculata 20 parts; [0021] forsythia suspense 15 parts; [0022] carthamus tinctorius linne 13 parts; [0023] balloon flower 12 parts; [0024] garlic 18 parts; and [0025] hawthorn 20 parts. [0026] A preparation method of the traditional Chinese medicine composition for the treatment of dairy cow laminitis comprises the steps: [0027] 1) weighing rhizoma coptidis, airpotato yam, andrographis paniculata, forsythia suspense, earthamus tinctorius linne, balloon flower, garlic and hawthorn respectively based on weight proportions, then crushing and sieving by a 80-mesh sieve; and [0028] 2) putting the sieved rhizoma coptidis, airpotato yan, andrographis paniculata, forsythia suspense, carthamus tinctorius linnc. balloon flower, garlic and hawthorn in a three-dimensional mixing tank for full and uniform mixing, to yield the traditional Chinese medicine composition for the treatment of dairy cow laminitis. [0029] The invention has the advantages and positive effects that: [00301 1) Both rhizoma coptidis and forsythia suspense in the traditional Chinese medicine composition for the treatment of dairy cow laminitis are bitter and cold in nature and have the efficacies of removal of heat and toxic substances, swelling reduction 3 RECEIVED TIME 21. JUN. 14:28 and stasis removal, and fire clearing and dampness elimination, so they serve as principal herbs in this formula. Airpotato yam and andrographis paniculata have the efficacies of removal of heat and toxic substances, blood cooling, and swelling reduction and pain relieving and serve as assistant herbs of rhizoma coptidis and forsythia suspense to enhance the effect of the principal herbs. Carthamus tinctorius linne and balloon flower have the efficacies of invigoration of blood circulation and removal of blood stasis as wlp ibt adwar nature and accordingly can he used together with the above principal and assistant herbs to achieve mutual restraint and synergy in drug natures. Garlic can regulate air flow, stimulate appetite, remove toxic substances and kill bacteria, so as to improve the resistance of dairy cows, and dairy cow's feed intake can be increased by stimulating appetite through sense of taste. And hawthorn can help digestion, eliminate indigestion and stimulate appctitc, so that milk yicld is incrcascd. [0031] 2) The invention has the efficacies of removal of heat and toxic substances, bacteria resistance and anti-inflammation, invigoration of blood circulation and pain relieving, and stomach strengthening and digestion promotion, and is free from drug residue and convenient to use. [0032] 3) The invention is broad in spectrum and efficient, quite stable for gastric acid and excellent in absorption under oral administration, and peak serum concentration can bc rcachcd within an cxtrcmcly short timc aftcr the composition is orally administcrcd, so as to achieve the curative effect. DETAILED DESCRIPTION OF THE EMBODIMENTS [00331 Further detailed description is made below to the invention with reference to the embodiments below. It needs to be noted that: the embodiments discussed hereinafter are illustrative instead of being limitative, and thus, the scope of the invention could not be 4 RECEIVED TIME 21. JU. 14:28 limited by the embodiments discussed hereinafter. [0034] Rhizoma coptidis, airpotato vam, andrographis paniculata, forsythia suspense, carthamus tinctorius linne, balloon flower, garlic and hawthorn mentioned in the invention are all available on the market. Example 1 [0035] A traditional Chinese medicine composition for the treatment of dairy cow laminitis, wherein the traditional Chinese medicine composition comprises the components in parts by weight as below: 20 g rhizoma coptidis, 15 g airpotato yam, 15 g andrographis paniculata, 10 g forsythia suspcnsc, 10 g carthamus tinctorius linnc, 10 g balloon flower, 15 g garlic, and 15 g hawthorn. [0036] A preparation method of the traditional Chinese medicine composition for the treatment of dairy cow laminitis comprises the steps: [0037] 1) Rhizoma coptidis, airpotato yam, andrographis paniculata, forsythia suspense, carthamus tinctorius linne, balloon flower, garlic and hawthorn are weighed respectively based on weight proportions, then crushed and all sieved by a 80-mesh sieve. [0038] 2) The sieved rhizoma coptidis, airpotato yam, andrographis paniculata, forsythia suspense, carthamus tinctorius linne, balloon flower, garlic and hawthorn are put in a three-dimensional mixing tank for full and uniform mixing, namely, the traditional Chinese medicine composition for the treatment of dairy cow laminitis is obtained. Example 2 [0039] A traditional Chinese medicine composition for the treatment of dairy cow laminitis, wherein the traditional Chinese medicine composition comprises the 5 RECEIVED TIME 21. JUN. 14:28 components in parts by weight as below: 23 g rhizoma coptidis, 18 g airpotato yam, 20 g andrographis paniculata, 15 g forsythia suspense, 13 g carthamus tinctorius linne, 12 g balloon flower, 18 g garlic, and 20 g hawthorn. [0040] The steps of the preparation method thereof are identical to those in the Example 1. Example 3 100411 A traditional Chinese medicine composition for the treatment of dairy cow laminitis, wherein the traditional Chinese medicine composition comprises the components in parts by weight as below: 25g rhizoma coptidis, 20g airpotato yam, 25g andrographis paniculata, 18g forsythia suspense, 15g carthamus tinctorius line, 15g balloon flower, 20g garlic and 25g hawthorn. [00421 The steps of the preparation method thereof are identical to those in the Example 1. [0043] The traditional Chinese medicine composition of the invention is used in such a manner that: 10 g traditional Chinese medicine composition is used for dairy cow during lactation period each time, and three times a day, and the composition is mixed with feedstuff when used; and 15 g traditional Chinese medicine composition is used for dairy cow during non-lactation period each time, and three times a day, and the composition is mixed with feedstuff when used. Trial on Clinical Application [00441 To verify the curative effect of the invention in natural cases of dairy cow laminitis, a trial on treatment of dairy cow laminitis in a dairy cow breeding base is carried out in Beichen District, Tianjin in August 2012. 62 dairy cows in this breeding base had the symptoms of stiff gait, unwillingness of standing, lying on the ground, lack 6 RECEIVED TIME 21. JUN. 14:28 of appetite and decreased milk production, increase of hoof wall temperature, toe bleeding under hoofing and the like, and were diagnosed with dairy cow laminitis. In this trial, the traditional Chinese medicine of the invention is compared with other therapeutics in the aspect of curative effect, in order to determine that the traditional Chinese medicine of the invention has the best curative effect when used for the treatment of dairy cow laminitis. [0045] 1. Material and Method [0046] 1.1 Animals for Trial [00471 The aforementioned 62 dairy cows diagnosed with laminitis are divided into two groups with each having 31 cows, i.e. a composition trial group and an amoxicillin trail group. The dairy cows are bred in accordance with a normal breeding management program. [00481 1.2 Drugs for Trial [0049] The composition of the invention is offered by our company and used according to usage instructions. [00501 Amoxicillin soluble powder: specification; 10%, Jiangxi Wankang Biotechnology Co., Ltd., batch number 140661199. [0051] 1.3 Trial Method [00521 The average daily milk yicld and the treatment condition of hoof sole in these dairy cows arc observed during this trial. Fresh blood is collected using a caudal vein blood collection method and then labeled, afterwards, the blood is diluted and then dripped into a special computing disc, and the computing disc with the blood thereon is put under a microscope to obtain the quantity of leucocytes and detect the quantity change of leucocytes in dairy cow blood. 7 RECEIVED TIME 21. JUN. 14:28 [0053] 1.4 Diagnosis Criteria of Dairy Cow Laminitis [0054] Dairy cow laminitis can be diagnosed based on such symptoms as incapability of standing and walking normally, stiff gait, lying on the ground, decrease of both feed intake and milk yield, increase of hoof wall temperature, red and swollen hoof sole and the like. Significant increase of the quantity of leucocytes in blood is observed by means of a blood routine test for discased dairy cows. [0055] 1.5 Grouped Drug Use [00 56] The traditional Chinese medicine composition is used for the composition trial group according to usage instructions; the amoxicillin soluble powder is used for the amoxicillin control group in a manner of being mixed with feedstuff. The quantity of leucocytes, milk yield, feed intake and hoofing condition of the two groups of dairy cows in the blood routine test are observed after 15 days, and detailed record is made ccry 3 days. [0057] 1.6 Judgment on Curative Effect [0058] The normal quantity of leucocytes in dairy cow blood is 12x1 0 9 /L, a healthy dairy cow has an average daily milk yield of 35kg and takes feed 7-9 times on average with large feed intake each time, and the surface of hoof sole is smooth and soft as well as pink in color. [0059] 2. Trial Result [0060] 2.1 Deternination on Average Quantity of Leucocytes in Dairy Cow BI(Xd Time Composition Trial Group Amoxicillin Trial Group 1-3 d (20-23) x10911, (21-23) x10'/T, 4-6 d (18-20) x10 9 /L (19-21) x10 9 /L 7-9 d (15-17) x10 9 /L (17-19) x109/L 10-12 d (12-14) x10 9 /L (16-17) x10 9 /L 8 RECEIVED TIME 21. JUN. 14:28 13-15 d 12x109/L (14-16) x1OV/L [0061] The quantity of leucocytes in the blood of the two groups of dairy cows is signi ficantly higher than a normal value aL the early stage of this trial, which indicates that all the dairy cows suffer from quite severe laminitis. And with the constant drug use for these two groups, the quantity of leucocytes in the blood gradually approaches the normal value. This means that, in laminitis treatment, the effect in the composition trial group is better than that in the amoxicillin trial group. [0062] 2.2 Comparison Result of Milk Yield Changes During Drug Use Time Composition Trial Group Amoxicillin Trial Group 1-3 d 20 kg 21 kg 4-6d 23kg 24kg 7-9 d 25 kg 26 kg 10-12 d 29 kg 27 kg 13-15 d 35 kg 30 kg [00631 It can be seen clearly from the above trial data that, milk yield increase in the composition trial group is higher than that in the amoxicillin trial group, and milk from the dairy cows of the control group is inedible in this process because drug residue is formed due to use of antibiotics. As a totally pure traditional Chinese medicine, the traditional Chinese medicine composition of the invention is free from drug residue inside animals and therefore guarantees safe, green and pollution-free byproducts, such as milk. After amoxicillin is administered to the dairy cows of the amoxicillin control group, the curative effect of this drug is gradually reduced since drug resistance is generated, and the milk yield is increased slowly, instead, after the traditional Chinese medicine composition of the invention is administered, no drug resistance is generated, the curative effect is gradually increased, the appetite of dairy cows is improved, and finally, the milk yield is increased. 9 nrr TUrR\ T ThAr Ai 1lkl A A A [0064] 2.3 Hoofing Treatment Condition Time Composition Trial Group Amoxicillin Trial Group 1-3 d Rough, red and swollen surface, red and swollen surface, quite even pus discharge, increase of much pus, high hoof wall hoof wall temperature temperature 4-9 d Crust on surface, gradually Improvement of red and swollen reduced abscess, decrease of surface, decrease of hoof wall hoof wall temperature temperature 10-15 d Complete elimination of crust, Disappearance of pus, smooth smooth surface, and pink skin and little red surface [0065] It can be seen from the above comparison results that, the effect of the traditional Chincsc mcdicinc composition of the invention is significantly superior to that of the amoxicillin trial group in hoof bottom treatment. The traditional Chinese medicine composition of the invention can reduce swelling rapidly, lower hoof wall temperature, ameliorate the inflammation on hoof bottom effectively, relieve pain and improve the mental state of dairy cows. The feed intake of dairy cows is increased so as to increase the milk yield. [0066] 3 Trial Result [00671 After the traditional Chinese medicine composition of the invention is used, discascd dairy cows arc ablc to stand and walk normally, thcir fccd intake and milk yicld are both increased to some extent, and their hoof wall temperature gets back to a normal temperature. 27 (87.1%) diseased dairy cows are oured and the other dairy cows are improved to some extent. 20 (64.52%) diseased dairy cows in the amoxicillin trial group are cured, symptoms of the other diseased dairy cows are relieved, but the curative effect in the amoxicillin trial group is obviously weaker than that in the composition trial group. Heartbeat, breath, activity strength and mental state of all the dairy cows are within a normal range in the entire treatment process, and there is no dead dairy cow and no any adverse reaction, therefore, the traditional Chinese medicine composition of the invention 10 RECEIVED TIME 21.UJ, 14:28 has excellent curative effect in treatment of dairy cow laminitis and is free from toxic and side effects. [0068] 4. Trial Conclusion [0069] 10 g traditional Chinese medicine composition is used for dairy cow during lactation period each time, 15 g traditional Chinese medicine composition is used for dairy cow during non-lactation period each time, three times a day, and the composition is mixed with feedstuff when used. The optimal curative effect for dairy cow laminitis can be achieved after the composition is continuously used for 15 days. 11 RFCFIVFD TIMF 21. JUN. 14:28