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Milk Protein Precursors in the Goat During Late Lactation

Published online by Cambridge University Press:  24 November 2017

B.J. Bequette
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
F.R.C. Backwell
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
A.G. Calder
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
J.A. Metcalf
Affiliation:
University of Reading, Whiteknights, Reading RG6 2AJ
D. Wray-Cahen
Affiliation:
University of Reading, Whiteknights, Reading RG6 2AJ
J.C. MacRae
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
G.E. Lobley
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
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Extract

Previously, we have reported on work in dairy goats using stable isotope kinetics to examine the precursors for milk protein synthesis (1). Contrary to a previous hypothesis (2), these results suggested that blood free amino acids (AA) are not simply transported into the mammary gland and incorporated directly into milk protein. Although the latter may still occur, a substantial amount of the AA for milk protein synthesis appears to be channelled through constitutive mammary gland protein(s) first. Moreover, the data indicated that a proportion (12-20%) of the casein protein precursor may be derived from extra-mammary sources other than blood free AA, e.g. peptides and/or proteins. It may be possible therefore to alter milk protein synthesis by the provision of different forms of precursor amino acids. Since the previous study was in goats during early lactation (day 61 ± 11), the present study reports on the precursors for milk protein synthesis in goats during late lactation, and allows a comparison between stages of lactation.

Type
Ruminant Protein Metabolism
Copyright
Copyright © The British Society of Animal Production 1993

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References

(1) Bequette, B.J., Backwell, F.R.C, Lobley, G.E. and MacRae, J.C. (1992) Milk protein precursors in lactating goats. BSAP, Winter Meeting, Paper No. 2.Google Scholar
(2) Oddy, V.H., Lindsay, D.B. and Fleet, I.R. (1988) Protein synthesis and degradation in the mammary gland of lactating goats. J. Dairy Res. 55, 143–154.CrossRefGoogle ScholarPubMed
(3) AFRC (1984). In: Report of the Protein Group of the Agricultural Research Council Working Party on the Nutrient Requirements of Rumiaunts-Supplementary Report to Chapter 4 (ARC, 1980); Farnham Common: Commonwealth Agricultural Bureaux.Google Scholar

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