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Effects of dairy factory, milk casein content and titratable acidity on coagulation properties in Trentingrana dairy industry

Published online by Cambridge University Press:  23 May 2016

Mauro Penasa ,
Valentina Toffanin ,
Nicola Cologna ,
Martino Cassandro  and
Massimo De Marchi
Mauro Penasa*
Affiliation:
Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padova, Viale dell'Università 16, 35020 Legnaro (PD), Italy
Valentina Toffanin
Affiliation:
Department of Agronomy, Food, Natural resources, Animals and Environment (DAFNAE), University of Padova, Viale dell'Università 16, 35020 Legnaro (PD), Italy
Nicola Cologna
Affiliation:
Trentingrana – Consorzio dei Caseifici Sociali Trentini s.c.a., Via Bregenz 18, 38121 Trento, 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
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
*
*For correspondence; e-mail: mauro.penasa@unipd.it
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Abstract

The objective of the present study was to investigate the effect of environmental factors, milk casein content and titratable acidity on milk coagulation properties (MCP) of samples routinely collected in the Trento province (northeast Italy) under field conditions. Rennet coagulation time (RCT, min), curd-firming time (k20, min) and curd firmness (a30, mm) were determined by Formagraph on 14 971 samples from 635 herds associated to 17 dairy factories. Besides MCP, fat, protein, and casein percentages, titratable acidity (TA), and somatic cell and bacterial counts were available. A standardised index of milk aptitude to coagulate (IAC) was derived using information of RCT and a30. An analysis of variance was conducted on MCP and IAC using a fixed effects linear model. Approximately 3% of milk samples did not form a curd within the testing time (30 min) and k20 was missing for 26% of milks. The percentage of samples without information on k20 largely differed among dairy factories (1·7–20·9%). Significant differences were estimated between the best and the worst dairy factory for RCT (−2 min), k20 (−1·2 min), a30 (+3·4 mm) and IAC (+2·6 points). Milk casein content and TA were important factors in explaining the variation of MCP and IAC, supporting the central role of these two traits on technological properties. The Trento province is heterogeneous in terms of dairy systems and this could explain the differences among dairy factories.

Keywords

Dairy industrymilk coagulation propertytitratable aciditycasein content

Information

Type
Research Article
Information
Journal of Dairy Research , Volume 83 , Issue 2 , May 2016 , pp. 242 - 248
Copyright
Copyright © Proprietors of Journal of Dairy Research 2016 

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