| Effect of Aflatoxin B1 on Moulard Duck's Natural Immunity. I Valtchev, T Koynarski, L Sotirov, Y Nikolov, P Petkov Pakistan Veterinary Journal 35 (1), 2015 | 47 | 2015 |
| Method for determination of the alternative pathway of complement activation in some animals and man LK Sotirov Fourth scientific conference of agriculture, Stara Zagora, 1-10, 1986 | 33 | 1986 |
| Lysozyme and complement activities in broiler-chickens with coccidiosis L Sotirov, V Koinarski Revue de médecine vétérinaire 154 (12), 780-784, 2003 | 24 | 2003 |
| Effect of different growth promoters on lysozyme and complement activity. II. Studing in turkeys L Sotirov, ST Denev, I Tsachev, M Lalev, M Oblakova, Z Porfirova Revue de medecine veterinaire 152 (1), 67-70, 2001 | 24 | 2001 |
| Changes in some factors of the innate immunity and serum zinc and iron concentrations in pigs following intravenous administration of Escherichia coli lipopolysaccharide M Andonova, I Borissov, L Sotirov Onderstepoort Journal of Veterinary Research 68 (2), 91-99, 2001 | 23 | 2001 |
| Semen lysozyme levels and semen quality in turkeys (Meleagris gallopavo) fed with various dietary protein levels L Sotirov, S Dimitrov, E Jeliazkov Revue de médecine vétérinaire 153 (12), 815-818, 2002 | 20 | 2002 |
| Phenotype characteristic and inheritance of lysozyme and complement activity in swine LK Sotirov Trak. Univ., PhD Diss. Abstr, 47-68, 1991 | 20 | 1991 |
| Mathematical welfare assessment model of chicken breeder flocks N Bozakova, S Popova-Ralcheva, V Sredkova, V Gerzilov, S Atanasova, ... Bulgarian Journal of Agricultural Science 18 (2), 278-287, 2012 | 19 | 2012 |
| Serum lysozyme concentrations in different sheep breeds L Sotirov, I Dimitrov, M Djorbineva Bulg J Vet Med 8, 83-89, 2005 | 18 | 2005 |
| Lysozyme and complement activity in different turkey breeds. L Sotirov, M Lalev, M Oblakova, Z Porfirova, S Tanchev, G Nikolov | 17 | 1998 |
| Effect of immunomodulator" Immunobeta" on humoral innate and acquired immune response in layer hens. N Bozakova, L Sotirov, T Koynarski, D Gundasheva | 16 | 2018 |
| Variations of acute phase protein (haptoglobin, fibrinogen and ceruloplasmin) concentrations in weaning rabbits after experimental infection with E. coli TM Georgieva, IP Georgiev, S Tanev, A Vachkov, V Petrov, PD Eckersall, ... Revue Méd. Vét 160 (3), 133-139, 2009 | 15 | 2009 |
| Influence of fearfulness on lysozyme and com-plement concentrations in dairy sheep I Dimitrov, M Djorbineva, L Sotirov, S Tanchev | 14 | 2005 |
| Welfare improvement in laying hens during the hot period under a semi-open rearing system through dietary arginine and vitamin C supplementation. NA Bozakova, LK Sotirov, N Sasakova, KV Lakticova Bulgarian Journal of Veterinary Medicine 18 (3), 2015 | 13 | 2015 |
| Breed-related differences in blood lysozyme concentration and complement activity in cows in Bulgaria L Sotirov, V Semerdjiev, T Maslev, B Draganov Revue de médecine vétérinaire 158 (5), 239-243, 2007 | 13 | 2007 |
| Influence of fearfulness on lysozyme and complement concentrations in dairy sheep ID Ivanov, M Djorbineva, L Sotirov, S Tanchev Revue de Médicine Vétérinaire 156, 8-9, 2005 | 13 | 2005 |
| Effect of different growth promoters on lysozyme and complement activity of broiler chicks. LK Sotirov, SA Denev, VK Georgieva | 13 | 2000 |
| Effect of silymarin and ochratoxin A on humoral natural immunity of broiler chickens S Denev, L Sotirov, S Chobanova, T Koynarski, V Ivanov, N Bozakova, ... Journal of Central European Agriculture 21 (3), 492-498, 2020 | 12 | 2020 |
| Lysozyme and complement concentrations in horses, donkeys and mules L Sotirov Revue de médecine vétérinaire 155 (4), 221-225, 2004 | 12 | 2004 |
| Study on the level of natural humoral immunity in turkey-broilers bred on two floor types IT Yotova, LK Sotirov, TK Stoyanchev, NA Bozakova, DJ Yarkov, ... Bulgarian Journal of Veterinary Medicine 7 (1), 51-56, 2004 | 11 | 2004 |