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Effect of milk composition and coagulation traits on Grana Padano cheese yield under field conditions

Published online by Cambridge University Press:  24 September 2012

Denis Pretto ,
Massimo De Marchi ,
Mauro Penasa  and
Martino Cassandro
Denis Pretto
Affiliation:
Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padova, Viale dell'Università 16, 35020 Legnaro (PD), Italy
Massimo De Marchi
Affiliation:
Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padova, Viale dell'Università 16, 35020 Legnaro (PD), Italy
Mauro Penasa*
Affiliation:
Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padova, Viale dell'Università 16, 35020 Legnaro (PD), Italy
Martino Cassandro
Affiliation:
Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padova, Viale dell'Università 16, 35020 Legnaro (PD), Italy
*
*For correspondence; e-mail: mauro.penasa@unipd.it
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Abstract

The aim of this study was to assess the effect of chemical composition, coagulation properties, pH, and titratable acidity (TA, SH°/50 ml) of vat milk on Grana Padano cheese yield (CY) under field conditions. Twelve cheese-making sessions were carried out from February to December 2009 in a dairy cooperative of Grana Padano Consortium (Italy), for a total of 96 vats of milk processed. For each vat, samples of raw milk were collected and analysed for quality traits (fat, protein, and casein contents), pH, TA, and milk coagulation properties (MCP), measured as rennet coagulation time (RCT, min), curd-firming time (k20, min), and curd firmness (a30, mm). Cheese yield was expressed as kilograms of cheese per 100 kg milk transformed, and was measured after 2 d of drainage. Fat, protein, and casein contents were positively and strongly correlated with CY (coefficients of correlation, r = 0·72, 0·88, and 0·84, respectively; P < 0·001). Coagulation properties were moderately and significantly (P < 0·001) related to CY: milk that coagulated earlier and had stronger a30 was associated to greater CY. Cheese yield was analysed with a model that accounted for fixed effects of cheese-making day, fat and protein content, TA, and a30. Significance was found for all the effects (P < 0·05). Milk characterised by high values of a30 resulted in higher CY than milk with low values of a30, indicating that MCP could be used as indicators of cheese-making efficiency. Future research should investigate the relationships between MCP and quality of cheese, and explore the feasibility of including MCP in multiple component milk pricing system for Grana Padano cheese production.

Keywords

Cheese yieldGrana Padanomilk coagulation property
Type
Research Article
Information
Journal of Dairy Research , Volume 80 , Issue 1 , February 2013 , pp. 1 - 5
Copyright
Copyright © Proprietors of Journal of Dairy Research 2012

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