Masters Theses

Author

Silvia Abel

Date of Award

8-1992

Degree Type

Thesis

Degree Name

Master of Science

Major

Animal Science

Major Professor

James D. Quigley III

Committee Members

Stephen P. Oliver, James K. Miller

Abstract

Thirty-three Holstein calves were removed from their dams prior to nursing and were assigned alternately to 2 L of maternal colostrum with or without 125 g colostral replacer. Calves were fed after 0 h blood sample and 12 h later. Milk replacer was fed after 24 h (4 1/d). Blood was obtained as soon as possible after birth and at 12, 24, 48, and 72 h and at 28 and 56 d of age. Maternal colostrum, colostral replacer and serum were analyzed for IgG1, IgG2, and IgM by radial immunodiffusion. Serum Ig concentration did not differ (P > .10) among treatments and increased to 24 h. Total serum Ig and IgG1 concentrations were affected by BW and intake of Ig, which accounted for 76 and 72% of variation in total Ig and IgG1 respectively. Significant differences due to sex were found for IgG2 and IgM without differences due to BW. Negative relationship between IgG2 and IgM was observed. When calves were fed good quality colostrum (total Ig > 30 mg/ml), serum IgG2 concentration tended to be greater in supplemented calves (P < .10), while serum IgM concentration was greater in calves fed maternal colostrum. Apparent efficiency of absorption of IgG1 and IgM were higher in calves fed maternal colostrum than in supplemented calves (P < .10).

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