Data is available on prevalenc of strongyloideswesteri in foals which cause diarrhea and its allopathic treatment is also available but there is no data available on herbal treatment of s. westeri and best protocol of allopathic drugs. So the purpose of the study is to study the incidence of S. westeri in foals. The risk factors associated with S. westeri and to develop the best treatment protocol for S. Westeri. The hypothesis of this study is; Identification of risk factors that was associated with S. westeri and efficacy of Allopathic verse herbal drugs was determined against S. westeri. Fecal samples were collected from foals. Gloves were lubricated with lubricating material before the sampling. Sample will be collected directly from rectum of the foals. The fecal material was collected in the properly labeled plastic jar. The samples were processed and examined in the Medicine Laboratory, University of Veterinary and Animal Sciences Lahore. Direct smear examination was carried out for the of S. westerieggs under microscope. For quantitative analysis, Mac Master Technique was used. The positive foals were divided into three groups A, B and C to check the efficacy of drugs on S. westeri. These groups were going through to chemotherapeutic trials with different groups of medicines including herbal and allopathic. Herbal medicine was Ginger (zingiberofficinale) and allopathic were oxibendazoleand ivermectin. Milk samples were also collected from newly parturated mares then evaluation and biometery of larvae was also done just to study the risk factors that transfer larvae from dam to foal through colostrum. Comparison and Identification of eggs and larvae in milk along with treatment effect were analyzed by Chi Square method using the SPSS software 22 version. The data obtained from this study revealed that:

 The main source of S. westeri infection was milk of dams. The larva of S. westeri passed through the dam’s milk to foals.
 The prevalence of S. westeri was strongly associated with the risk factor such age, colostrum intake, species, breed, dite, environment, water supply and deworming treatments.
 Vaccination had no effect on prevalence of S. westeri.
 Allopathic drugs are more efficient against S. westeri infection in foals as compared the herbal drugs.
 The efficacy of Ivermectin was more as compared to Oxibendazole