Variation in colostral immunoglobulin G concentration in fat tailed sheep and evaluation of methods for estimation of colostral immunoglobulin content
2013
Tabatabaei, S., University of Tehran (Iran). Dept. of Microbiology and Immunology | Nikbakht, G., University of Tehran (Iran). Dept. of Microbiology and Immunology | Vatankhah, M., Agricultural and Natural Resources Center of Chaharmahal and Bakhtyari province, Shahrekord (Iran) | Alidadi, N., University of Tehran (Iran). Dept. of Clinical Sciences
The aim of this study was to investigate possible effects of litter type and ewe parturition number on colostral IgG concentration in two Iranian fat-tailed breeds of sheep (Shaul and Lori Bakhtyari) as well as usefulness of different methods for estimation of IgG concentrations in colostrum. The colostral IgG concentrations were measured in 38 Shaul and 59 Lori Bakhtyari ewes by single radial immunodiffusion, zinc sulphate turbidity and Biuret methods. Measurement of IgG by single radial immunodiffusion revealed that Lori Bakhtyari ewes had significantly (P less than 0.05) lower colostral IgG levels (48.82 +/- 2.10 mg/ml) than Shaul ewes (62.86 +/- 2.48). With regard to the effect of litter type and parturition number, a significant (P less than 0.05) difference in IgG concentration of colostrum was only observed between the first (65.17 +/- 5.74 mg/ml) and third parturition (41.10 +/- 4.60 mg/ml) of Lori Bakhtyari ewes. The colostral IgG concentration was not associated with ewe serum IgG concentration (P more than 0.05). The mortality rate was higher in lambs born to ewes with lower IgG in their colostrum. Single radial immunodiffusion did not correlate either with zinc sulphate turbidity method (r = -0.253, P more than 0.05) or with Biuret method (r = -0.005, P more than 0.05). We can conclude that concentration of colostral IgG could be influenced by breed but not by litter type and parturition number.
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