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Immune Function in Dairy Cows Related to Energy Balance and Metabolic Status in Early Lactation

Abstract

Two feeding experiments were carried out in 2 successive years with 28 cows of the Norwegian Red Cattle (NRF) in each experiment.

The cows were randomly distributed into 4 groups and subjected to different feeding regimens from 1 month prior to calving until 12 weeks after calving. The experimental design was factorial (2×2) with respect to protein content of the concentrate (17.5 % digestible crude protein (DCP) v.s. 12.5 % DCP) and concentrate allowances (standard v.s. substandard allowances after calving). Silage was offered ad libitum.

Samples for estimation of serum immunoglobulin-G, white blood cells and lymphocyte responses to the mitogens phytohemagglutinin, concanavalin A and pokeweed mitogen were collected 4 weeks prior to expected calving, and 2, 4 and 8 weeks after calving. The levels of milk immunoglobulin-G were estimated at calving and 2, 4 and 8 weeks after calving.

A significant positive relationship was found between the estimated energy balance and the lymphocyte response to mitogens. Little evidence was found for the existence of a significant relationsip between the immunologic parameters and plasma indicators of metabolic status. The lymphocyte response to phytohemagglutinin and levels of serum immunoglobulin-G increased, while levels of milk immunoglobulin-G decreased during the period from calving to 8 weeks after calving.

Increased milk somatic cell counts were associated with a significant decrease in the lymphocyte responses to mitogens.

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Acknowledgments

We wish to thank L. Midthjell, E. B. Gondrosen, L.-W. Fredriksen, H. Hansen and B. Johansen for excellent technical assistance. The experiment was financially supported by grants from The Norwegian Agricultural Research Council.

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Ropstad, E., Larsen, H.J. & Refsdal, A.O. Immune Function in Dairy Cows Related to Energy Balance and Metabolic Status in Early Lactation. Acta Vet Scand 30, 209–219 (1989). https://doi.org/10.1186/BF03548057

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