J. Anim Sci.
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J. Anim Sci. 1973. 36:73-78.
© 1973 American Society of Animal Science
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Postpartum Changes in Nitrogenous Constituents of Sow Milk1, 2,

B. E. Brent3, E. R. Miller, D. E. Ullrey and K. E. Kemp4

Kansas State University, Manhattan 66502 and Michigan State University, East Lansing 48823

Abstract

COLOSTRUM and milk were collected from sows at intervals from farrowing to 35 days postpartum. Total nitrogen, casein nitrogen, heat-coagulated nitrogen (whey proteins coagulated by autoclaving), and residual nitrogen (total minus casein and heat-coagulated fractions), solids, gross energy and whey electrophoretic patterns were determined. Regression equations were fitted to the data by least squares. Total, casein and heat-coagulated nitrogen, as well as the electrophoretic whey protein fractions decreased dramatically from farrowing to about 48 hours. Total solids, gross energy and residual nitrogen underwent smaller changes. Equations of the form, y=axbcx, fitted the data well. Coefficients are presented to allow estimation of a number of milk components at various times after farrowing.

Footnotes

1 Published with the approval of the Director of the Michigan Agricultural Experiment Station as Journal Article No. 5822.

2 Contribution No. 412, Department of Animal Science and Industry; Contribution No. 156, Department of Statistics and Computer Science, Kansas Agricultural Experiment Station, Manhattan 66502.

3 Present address: Department of Animal Science and Industry, Kansas State University, Manhattan 66502.

4 Present address: Department of Statistics and Computer Science, Kansas State University, Manhattan 66502.






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Copyright © 1973 by the American Society of Animal Science.