Yoghurt with a weak flavour

Case-based quiz on cultured milk products: yoghurt with a weak flavour. 3 multiple-choice questions.

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A dairy is producing yoghurt with a weak, flat flavour and low viscosity. Analyses show a low acetaldehyde content. What is the most likely cause?

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All 3 questions in this quiz

A dairy is producing yoghurt with a weak, flat flavour and low viscosity. Analyses show a low acetaldehyde content. What is the most likely cause?
Which factor affects the ratio between Lb. bulgaricus and Sc. thermophilus in the yoghurt culture?
What is the optimum filling temperature for stirred yoghurt, and why?

Sources

The questions are based on the Danish textbooks below and translated from the Danish. Main source: Mejerilære 2. Page numbers in the quizzes are the books' own; “unknown” means the page could not be established. The full tests also refer to Mælkekemi and Tetra Pak's Dairy Processing Handbook.

Waagner Nielsen, E. & Ullum, J. A. (2003). Mejerilære 1. [Dairy technology, vol. 1: general.] 4th edition, 1st printing. Erhvervsskolernes Forlag, Odense. ISBN 87-7881-397-2.
Waagner Nielsen, E. & Ullum, J. A. (2004). Mejerilære 2. [Dairy technology, vol. 2: products.] 5th edition, 1st printing (1st edition 1986). Erhvervsskolernes Forlag, Odense. ISBN 87-7881-484-7. [main source]
Stein Jensen, P. & Nielsen, J. J. (2006). Mikrobiologi. [Microbiology.] 5th edition (3rd printing 2022). Praxis Forlag A/S, Copenhagen. ISBN 978-87-7881-662-7.
Waagner Nielsen, E. & Buch Kristensen, J. M. (2006). Mikrobiologi og bioteknik. [Microbiology and Biotechnology.] 2nd edition. Erhvervsskolernes Forlag, Odense. ISBN 978-87-7881-666-5.
Stein Jensen, P. (2003). Mejeriproduktion. [Dairy Production.] 3rd edition, 1st printing. Erhvervsskolernes Forlag, Odense. ISBN 87-7881-411-1.
Statens Forsøgsmejeri [Danish State Experimental Dairy] (1961). 128. beretning. [Report no. 128.] Hillerød.

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