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The effects of mineral block ingredients when offered to ewes in late pregnancy on Immunoglobulin G (IgG) absorption in their lambs

  • T. M. Boland (a1), P. O. Brophy, J. J. Callan (a1), P. J. Quinn (a1), P. Nowakowski (a2) and T. F. Crosby (a1)...

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Lambs are born hypoimmunocompetent as the placenta prevents the transfer of maternal immunity to the foetus of the ruminant. Colostrum is the source of imunoglobulins for the young lamb and any interference with the absorption of immunoglobulins from colostrum would have important consequences for lamb liveability in early life. Recent experiments at this institute found that when ewes had access to mineral blocks in late pregnancy the absorption of immunoglobulin (IgG) by their offspring was reduced (Keane 2001). This author also stated that the lamb was preprogrammed in-utero for lowered IgG absorption efficiency. The aim of this experiment was to determine whether it was the mineral or molasses component of the mineral block which caused the reduced IgG absorption by the lamb.

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Fahey, J. L. and McKelvey, E. M. 1965. Quantitative determination of serum immunoglobulins in antibody agar plates. Journal of Immunology 94: 8490.
Keane, N. 2001. Some factors influencing early lamb performance and IgG absorption in March born lambs. M. Agr. Sc. Thesis, National University of Ireland, Dublin.
McEwan, A. D., Fisher, E. W., Selman, I. E. and Penhale, W. J. 1970. A turbidity test for the estimation of immune globulin levels in neonatal calf serum. Clinica Chimica Acta 27: 155163.

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The effects of mineral block ingredients when offered to ewes in late pregnancy on Immunoglobulin G (IgG) absorption in their lambs

  • T. M. Boland (a1), P. O. Brophy, J. J. Callan (a1), P. J. Quinn (a1), P. Nowakowski (a2) and T. F. Crosby (a1)...

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