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Effects of different storage conditions, the farm and the stage of lactation on renneting parameters of goat milk investigated using the Formagraph method

Published online by Cambridge University Press:  21 July 2011

Michele Pazzola*
Affiliation:
Department of Animal Biology, University of Sassari, via Vienna 2, 07100 SassariItaly
Filippo Balia
Affiliation:
Department of Animal Biology, University of Sassari, via Vienna 2, 07100 SassariItaly
Maria Luisa Dettori
Affiliation:
Department of Animal Biology, University of Sassari, via Vienna 2, 07100 SassariItaly
Maria Consuelo Mura
Affiliation:
Department of Animal Biology, University of Sassari, via Vienna 2, 07100 SassariItaly
Vincenzo Carcangiu
Affiliation:
Department of Animal Biology, University of Sassari, via Vienna 2, 07100 SassariItaly
Giuseppe Massimo Vacca
Affiliation:
Department of Animal Biology, University of Sassari, via Vienna 2, 07100 SassariItaly
*
*For correspondence; e-mail: pazzola@uniss.it

Abstract

This study evaluated the effect of storage on renneting properties of goat milk investigated using the Formagraph method. Milk samples from 169 goats in three farms (F1, F2 and F3) were analysed during an entire lactation (45, 75, 105, 135 and 165 days in milking DIM), to obtain renneting parameters, both from fresh milk and after storage with Bronopol and freezing at −20°C and −80°C. As regards fresh milk, mean values of clotting time were between 12·51 (45 DIM) and 13·29 min (105 DIM and F2), the curd firming time between 1·77 (45 DIM) and 2·15 min (F1) and curd firmness between 42·09 (165 DIM) and 49·55 mm (45 DIM). No statistical difference was recorded after storage. After regression analysis, all prediction models showed significance value at P<0·001 with the highest R2 value for clotting time, 0·710 (fresh vs. frozen milk at −20°C), and the lowest for clot firmness, 0·281 (fresh vs. frozen milk at −80°C). Results demonstrated that assessment of goat milk coagulation properties using the Formagraph method is also achievable after freezing or Bronopol addition.

Type
Research Article
Copyright
Copyright © Proprietors of Journal of Dairy Research 2011

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