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Whey protein dynamics in goat mammary secretions during colostrum and early lactation periods

Published online by Cambridge University Press:  08 April 2024

Raquel F. S. Raimondo ,
Samantha I. Miyashiro  and
Eduardo H. Birgel Junior
Raquel F. S. Raimondo*
Affiliation:
RuminAção – Teaching, Research and Extension in Ruminants, Faculty of Veterinary Medicine, Federal University of Rio Grande do Sul, Porto Alegre, Brazil Department of Internal Medicine, School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
Samantha I. Miyashiro
Affiliation:
Department of Internal Medicine, School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, Brazil
Eduardo H. Birgel Junior
Affiliation:
Department of Veterinary Medicine, College of Animal Science and Food Engineering, University of São Paulo, São Paulo, Brazil
*
Corresponding author: Raquel F. S. Raimondo; Email: raquel.raimondo@ufrgs.br
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Abstract

The protein composition in goat milk undergoes changes throughout the different lactation periods, displaying distinct characteristics that are influenced by the dynamic nature of protein composition and concentration during the transition from colostrum secretion to mature milk. To evaluate the dynamics of whey proteins of Saanen goats during the colostral phase and the first month of lactation, 110 milk samples from 11 healthy mammary halves of seven Saanen goats were selected through a clinical evaluation. Whey was obtained by rennet coagulation of the mammary secretion. The biuret method determined total protein concentration, and their fractions were identified by 12% dodecyl sulfate-polyacrylamide gel electrophoresis. Maximum concentrations of all protein fractions were observed in the first 12 h of lactation, reducing throughout the study. Modification of the protein predominance was also observed. The transition from colostrum secretion to milk occurred 5 or 7 d postpartum.

Keywords

Alpha-lactalbumincolostrumimmunoglobulinmilkSDS-PAGE
Type
Research Article
Information
Journal of Dairy Research , First View , pp. 1 - 5
Copyright
Copyright © Universidade de São Paulo, 2024. Published by Cambridge University Press on behalf of Hannah Dairy Research Foundation

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