Animal and Veterinary Sciences 2013; 1(5): 32-35 Published online September 10, 2013 (http://www.sciencepublishinggroup.com/j/avs) doi: 10.11648/j.avs.20130105.11 Gross-pathologic and therapeutic implications for uncomplicated white line disease in dairy cows: A case series study Mohsen Nouri 2, * , Fateme Katouli 1 , Fahime Zibaee 1 , Iradj Nowrouzian 2 , Seyed Mohamad Karbalaee Seyed Javad 2 1 Iranian Arad Pajouh Veterinary University Center, Tehran, Iran 2 Department of Clinical Sciences, Faculty of Veterinary Medicine, the University of Tehran, Tehran, Iran Email address: mnouri2@yahoo.com(M. Nouri) To cite this article: Mohsen Nouri, Fateme Katouli, Fahime Zibaee, Iradj Nowrouzian, Seyed Mohamad Karbalaee Seyed Javad. Gross-Pathologic and Therapeutic Implications for Uncomplicated White Line Disease in Dairy Cows: A Case Series Study. Animal and Veterinary Sciences. Vol. 1, No. 5, 2013, pp. 32-35. doi: 10.11648/j.avs.20130105.11 Abstract: This short communication describes the gross-pathologic and therapeutic implications of uncomplicated white line diseasein one large dairy herd with records of lameness events over a 7 months period in the vicinity of Tehran, Iran.White line lesions were confirmed on 232 of cows with the lameness score of 3 and 4. The prevalence rate of WL lesions in axial wall at zone 1, apex of toe at zone 1 and abaxial wall at zone 1, 2 and 3 were 53 cases (23.0 %), 44 cases (19.0 %) and 130 cases (58.0 %), respectively. Fourteen percent have been trimmed incorrectly and the sole becomes too thin during trimming. Full treatment results achieved in 87.0 % of cases in an average of 28 days.This study showed that laminitis- associated white line disease response well to appropriate therapy and proper trimming can play an important role for lameness prevention strategies in large dairy herds. Keywords: Claw, Lameness, Pathology, White Line Disease, Treatment 1. Introduction Claw lesions are the most important cause of lameness [1,2].White line disease (WLD) is a commonly observed lesion and has frequently been reported as a major cause of lameness[1, 3, 4]. WLD accounts for considerable economic cost due to lose in milk yield [3, 5], weight and fertility [6, 7]and increases the risk of culling [7-9]. Several reports from Iran indicated the condition as responsible for between 1.53 %and 27.14 %of lameness[9-11]. Other studies also have reported the disease between 5.5 %and 39.0 % [1, 4, 12-14]. Nouriet al., (2013) observed affected digits of the culled lame cows with WLD depicted a quite wide range of pathologicsigns such as excessive new bone formation, osteolysis, ankylosis and sequestration of the third phalanx (P3)[7]. Mansouri et al. (2011) found sub-solar abscess in zone 3 progressed to the septic osteitis of the P3 bone with osseous sequestration in 14.2 % cases[11].In 14 (18.3%) of 76 cows referred for digit amputation, the primary lesion had been WLD[15]. A prompt identification of problematic cases is needed to be done for prevention of premature culling[7, 9].This short communicationdescribes the gross-pathologic and therapeutic implications of uncomplicated WLD in one large dairy herd with records of lameness events over a 7 months period in the vicinity of Tehran, Iran. 2. Case History Between January and July 2011, 232 Holstein cows having WLDwere treated and the healing process was observed in the course of veterinary practice.The practice is located in a commercial dairy farm with 2800 milking cows in the vicinity of Tehran. The cows were attended at the request of a farmer and the details of each casewere recorded on a prepared lameness form at completion of the farm visit.Cows were kept in free stall with sand beddingon concrete floor and fed a total-mixed ration. The diet consisted of alfalfa hay, corn silage and a commercial concentrate. The mean age of the animals was 3 to 10 years. All cows were scored for locomotion once a month after milking when leaving the parlour. The locomotion scoring