Efficacy of different dosages of ivermectin injectable against the Hypoderma spp. in yaks.
A chemotherapy trial was conducted to determine the lowest dosage of injectable preparation of ivermectin against Hypoderma spp. infestation in yaks in Tibetan areas in Tianzhu county, Gansu province, in northwest of China. One hundred and sixty yaks were randomly divided into four groups of 40 yaks for the trial. The first three groups were treated by subcutaneous injection in the neck with 0.1% ivermectin (respectively, 1, 5, 10 microg/kg body weight). The fourth group was not treated and considered as control group. All the experiments were performed in November 2000 and the animals were examined for the presence of warbles in the next March and May. The results indicated that there was no warbles found on the back of treated animal while third stage larvae were palpated on back of some of the yaks in control group. It is concluded that dosage of 1 microg/kg ivermectin injectable was sufficient to kill or stop development of larvae of Hypoderma spp. in naturally infected yaks if administrated in November.
Ma
Miling
M
Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Xujiaping 11, Lanzhou 730046, Gansu, PR China.
Guan
Guiquan
G
Lu
Bingyi
B
Liu
Aihong
A
Liu
Zhijie
Z
Chang
Zengrong
Z
Li
Faxing
F
Chang
Feng
F
Luo
Jianxun
J
Lu
Wenshun
W
Zhang
Qicai
Q
Yuan
Gailing
G
Yin
Hong
H
Boulard
Chantal
C
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000188:drug therapy* / Q000469:parasitology; D004175:Diptera / Q000187:drug effects* / Q000254:growth & development; D004305:Dose-Response Relationship, Drug; D007000:Hypodermyiasis / Q000188:drug therapy / Q000469:parasitology / Q000662:veterinary*; D007279:Injections, Subcutaneous / Q000662:veterinary; D007306:Insecticides / Q000008:administration & dosage / Q000627:therapeutic use*; D007559:Ivermectin / Q000008:administration & dosage / Q000627:therapeutic use*; D011897:Random Allocation; D016896:Treatment Outcome
D007306:Insecticides; D007559:Ivermectin