(2) background technology
The bovine livestock dermatobiasis is a kind of parasitic disease, and primary disease is in northern China large tracts of land branch, and is the most serious with northwest, northeast and pastoral area, the Inner Mongol especially, and at China's southern area, the cattle of being introduced by popular district only also has generation.Primary disease can cause the productivity of domestic animal to descend and sanitary condition descends, also cause hide discarded, bring great economic loss to animal husbandry: though adult does not bite cattle, but female fly circles in the air can cause when laying eggs that cattle is only uneasy, play kick, frightened and make normal life and search for food and be affected, with the passing of time cattle only becomes thin, sometimes " going mad " symptom only appears in cattle, causes once in a while to get injured by a fall or pregnant domestic animal miscarriage.When larva pierces skin, cause the skin sufferings, spirit is uneasy, and larva is divided a word with a hyphen at the end of a line in vivo, causes the tissue injury of portion of dividing a word with a hyphen at the end of a line.Particularly the 3rd the phase larva subcutaneous when parasitic at the back, cause local connective tissue proliferation and subcutaneous cellulitis, the formation fistula can suppurate during the secondary bacterial infection.Larva is left cicatrix behind the parasitism of back, influence leather and be worth.The toxin of torsalo larva, harmful to cattle blood only, can cause anemia.Suffer from poultry and become thin, meat reduces, and lactogenic female animal milk production descends.Indivedual suffering from, raise, and larva is strayed into medulla oblongata or brain parasitism, can cause nervous symptoms, even cause death.Once in a while as seen the allergy that causes because of the torsalo larva, results from the natural death of larva or mechanical deinsectization to squeeze broken larva body fluid and be absorbed and sensitization, when contacting antigen once more, anaphylaxis takes place promptly.Show as urticaria, or the swelling of eyelid, conjunctiva, labia, breast is arranged, shed tears sialorrhea, accelerated breathing.Since the reform and opening-up, in all parts of the country generally strengthened should disease preventing and controlling, but because most Therapeutic Method that adopts fenthion, though it is evident in efficacy, but fenthion is an organophosphorus insecticide, a large amount of uses continuously not only cause environmental pollution, cause meat, milk Chinese medicine residual quantity too high, the serious harm human health.In the recent period, EU Committee by bill, completely forbade Chinese livestock products from 2002 and enters European Union market at the bottom of calendar year 2001, and its main cause is a residue of veterinary drug.Yet for the prevention and the control of bomb fly disease, do not have still at present that a kind of residual quantity is little, price is low, curative effect is high, to healthy this type of the little medicine of harm humans.
(3) summary of the invention
The present invention is to reduce environmental pollution, to reduce the drug residue in the meat, solving problems such as prevention and control hypodermiasis in bovine is purpose, has developed that a kind of cost is low, curative effect is high, has had no side effect, can prevent and treat the special-purpose ivermectin microdosage of the bomb fly injection of bomb fly disease.
The technical scheme that realizes the object of the invention is:
A kind of ivermectin injection that is used for the treatment of hypodermiasis in bovine is characterized in that with the former powder of ivermectin be Main Ingredients and Appearance, and is formulated by following weight portion:
Ivermectin 0.2-1.0g
Glycerin methylal 20-100ml
Propylene glycol 400-480ml
Prepare by following process:
Accurately take by weighing ivermectin, measure required glycerin methylal and propylene glycol, stir down in 15 ℃ of-25 ℃ of room temperature states and spend the night, make ivermectin solution transparent, container bottom does not have precipitation, the no floating thing in solution body surface, be after ivermectin fully dissolves, to add propylene glycol, and abundant mixing.Packing 10lb/sq high pressure 15 minutes.
Beneficial effect is analyzed: the valid density that this medicine contains ivermectin is 0.04%, and using method is the cervical region subcutaneous injection: per 100 kg body weight are injected this medicine 1ml, can effectively prevent and control hypodermiasis in bovine.And the prescription valid density of the ivermectin of present most treatment bomb fly disease is 1%.The valid density of ivermectin reduces by 25 times than the valid density of the ivermectin in the commercially available treatment bomb fly disease medicament among the present invention, this has not only reduced the medicine production cost, but also greatly reduce drug residue, increased the degree of safety that food uses.Simultaneously, the best use of the present invention is the annual 9-11 month season; This moment, warble just just grew, and is higher to the sensitivity of medicine; Drug therapy is educated the death of bomb fly, it can not further be grown be the 3rd the phase larva, it is subcutaneous to travel to the back, Corii Bovis seu Bubali can not bore a hole, can not leave cicatrix yet, has improved leather value.The annual infected cattle torsalo animal in the whole nation reaches 4,000 ten thousand, and only the loss of leather aspect just reaches 200,000,000 yuans, and bomb fly mainly is popular in former revolutionary bases, minority-inhabited areas, frontier areas and poverty-stricken areas and the relatively backward area of economic civilization.Therefore, the special-purpose ivermectin microdosage of the bomb fly injection of the present invention's development may sell in above-mentioned area, has huge market potential; Large-scale control can significantly reduce the economic loss that is caused by bomb fly, improves peasants and herdsmen deeply, has very important economic and social benefit.
LD for this medicine
50Measure, undertaken, adopt intraperitoneal injection by the improvement karber's method of medicine acute toxicity test.The test branch is groped test, trial test and formal test three parts and is carried out.Laboratory animal is that 25-30 age in days Kunming is healthy mice (body weight 18-22g), and white mice is from Lanzhou Veterinary Inst., Chinese Academy of Agricultural Science laboratory animal field.
96 of the following white mice of formal test method and result, every group of 16 male and female half and half, totally 6 groups.One group of blank, 5 drug dose groups, the dose value of dosage group is geometric ratio and distributes, and logarithm value etc. are difference cloth, with the D of pilot study
MinBe minimum dose group, D
MinLogarithm value add group apart from i, be second group dosage logarithm value, use antilogarithm table, find the opposition numerical value of this value, this just obtains second group true dose value.Then, and the like.The fractional part round number of each dosage group during test.0.2ml/ medicine of every drug dose group injection, the medicine agent with more than the dosage that obtains, blank group injection 0.2ml/ two water that heat up in a steamer only.The body weight of white mice is by average 20g.The concentration and the dosage of grouping during formal test and medicine injection see Table 1.
The concentration and the dose form of table 1 formal test grouping and injection
Table 1 Grouping and injection dosage in the formal trial
Group | Number of animals (only) Number of (rats) | Dosage logarithm value Dose Loggarithm | Dosage (mg/ kg) Dose (mg/g) | Injection concentration % Injection concentration% | Injection volume (ml) Injection dose (ml) |
1 | 16 | 1.5 | 32 | 0.32 | 0.2 |
2 | 16 | 1.66 | 46.8 | 0.47 | 0.2 |
3 | 16 | 1.82 | 66.1 | 0.66 | 0.2 |
4 | 16 | 1.98 | 95.5 | 0.96 | 0.2 |
5 | 16 | 2.14 | 138 | 1.38 | 0.2 |
Contrast | 16 | | | | 0.2 |
Medicine injection back is observed 3d and is write down active situation, poisoning symptom and the death condition of respectively organizing white mice.Formal test, what obtain the results are shown in Table 2.
Table 2 mice LD
50The measurement result table
Table 2.The results of LD
50 in rats
Group | Dosage (mg/kg) Dose (mg/kg) | Log10 dose | Number of animals Number of animals | Death toll Number of mortality | P mortality rate Motality | Other relevant data |
1 | 32 | 1.5 | 16 | 4 | 0.25 | N=16 (every treated animal number) k=5 (packet count) i=0.16 Xm=2.14 ∑ p=2.625 ∑ p2=1.742 |
2 | 46.8 | 1.66 | 16 | 3 | 0.1875 |
3 | 66.1 | 1.82 | 16 | 9 | 0.5625 |
4 | 95.5 | 1.98 | 16 | 14 | 0.875 |
5 | 138.0 | 2.14 | 16 | 12 | 0.75 |
Blank Control of group | Distilled water Double distilled water | | 16 | 0 | 0 |
According to above result, calculate the LD of medicine with the formula that improves karber's method
50The median lethal dose(LD 50) formula of medicine is LD
50=log-1[X
k-i (∑
p-0.5)]
P is each group mortality rate in the formula, and i is the logarithm of ratio between adjacent two dosage, X
kBe the logarithm of maximal dose, ∑ is a summation.
LD
50=log-1【2.14-0.16(2.625-0.5)】=63.09mg/kg.bw
The control experiment: through using nearly 50000 yaks in the popular district of bomb fly in Gansu Province's God blessings county, Weiyuan County, Maqu County, Anxi county, cattle and pien niu, the ratio that the control animal does not have bomb fly is 95-100%.
(4) specific embodiment
Embodiment 1, in the conventional ratio preparation lot number of each component 010912 medicine: 50000ml
Ivermectin 20g
Glycerin methylal 2000ml
Propylene glycol 48000ml
Prepare by following process:
Accurately take by weighing ivermectin, measure required glycerin methylal and propylene glycol, stir down in 15 ℃ of room temperature states and spend the night, make ivermectin solution transparent, container bottom does not have precipitation, the no floating thing in solution body surface, be after ivermectin fully dissolves, to add propylene glycol, and abundant mixing.Packing 10lb/sq high pressure 15 minutes.
Embodiment 2, each component prepare in proportion lot number be 010913 medicine 20000ml wherein:
Ivermectin 8.0g
Glycerin methylal 2000ml
Propylene glycol 18000ml
Prepare by following process:
Accurately take by weighing ivermectin, measure required glycerin methylal and propylene glycol, stir down in 25 ℃ of room temperature states and spend the night, make ivermectin solution transparent, container bottom does not have precipitation, the no floating thing in solution body surface, be after ivermectin fully dissolves, add propylene glycol and abundant mixing.Packing 10lb/sq high pressure 15 minutes.
Embodiment 3, each component are 010914 medicine 40000ml in following ratio preparation lot number, wherein:
Ivermectin 16.0g
Glycerin methylal 8000ml
Propylene glycol 32000ml
Preparation method is with embodiment 1 or 2.
Embodiment: 4. press best proportion preparation 150000ml.Lot number: 020815.
Ivermectin 60g,
Glycerin methylal 6000ml,
Propylene glycol 144000ml
Preparation method is with embodiment 1 or 2.