<abstract xmlns="http://www.w3.org/1999/xhtml"><p> The objective of this study was to estimate the influence of lactation number, month of milk sampling, lactation stage and herd size on the freezing point of milk of Polish Holstein‑Friesian cows. Data comprised 4,719,787 milk samples from the first seven lactations of 752,770 Polish Holstein- Friesian cows. Milk freezing point (MFP), milk yield, and fat and protein content were analyzed. The mean MFP of milk samples (-0.5326°C) as well as more than 92% of all milk samples did not exceed the quality limit for the freezing point of cows′ raw milk, which, following Polish standards, was taken to be -0.52°C. The freezing point of milk samples, milk yield, fat and protein content were highly significantly affected by all examined factors: month of sampling, successive lactations, stage of lactation, and herd size. MFP was lowest in milk samples taken from January to March, and highest in samples from November to December. MFP increased with lactation number. Mean MFP decreased with time within lactation, except the first stage (5-35 days in milk). Generally, MFP was highest in small herds (up to 9 cows) and lowest in large herds (more than 150 cows).</p></abstract>

The objective of this study was to estimate the influence of lactation number, month of milk sampling, lactation stage and herd size on the freezing point of milk of Polish Holstein‑Friesian cows. Data comprised 4,719,787 milk samples from the first seven lactations of 752,770 Polish Holstein- Friesian cows. Milk freezing point (MFP), milk yield, and fat and protein content were analyzed. The mean MFP of milk samples (-0.5326°C) as well as more than 92% of all milk samples did not exceed the quality limit for the freezing point of cows′ raw milk, which, following Polish standards, was taken to be -0.52°C. The freezing point of milk samples, milk yield, fat and protein content were highly significantly affected by all examined factors: month of sampling, successive lactations, stage of lactation, and herd size. MFP was lowest in milk samples taken from January to March, and highest in samples from November to December. MFP increased with lactation number. Mean MFP decreased with time within lactation, except the first stage (5-35 days in milk). Generally, MFP was highest in small herds (up to 9 cows) and lowest in large herds (more than 150 cows).

Factors affecting the freezing point of milk from Polish Holstein-Friesian cows

Annals of Animal Science

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

{"article-title":"Factors affecting the freezing point of milk from Polish Holstein-Friesian cows"}

The objective of this study was to estimate the influence of lactation number, month of milk sampling, lactation stage and herd size on the freezing point of...

Factors affecting the freezing point of milk from Polish Holstein-Friesian cows

Article Category: Behavior, well-being, production technology, and environment

Published Online: Aug 01, 2017

Page range: 873 - 885

Received: Jun 14, 2016

Accepted: Feb 09, 2017

DOI: https://doi.org/10.1515/aoas-2016-0088

Keywords
milk freezing point, Polish Holstein-Friesian cows

© by Agnieszka Otwinowska-Mindur

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Factors affecting the freezing point of milk from Polish Holstein-Friesian cows

Article Category: Behavior, well-being, production technology, and environment

Published Online: Aug 01, 2017

Page range: 873 - 885

Received: Jun 14, 2016

Accepted: Feb 09, 2017

DOI: https://doi.org/10.1515/aoas-2016-0088

Keywordsmilk freezing point, Polish Holstein-Friesian cows

© by Agnieszka Otwinowska-Mindur

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
milk freezing point, Polish Holstein-Friesian cows