The interaction between the milk production, milk components with a low frequency of analysis and factors affecting the milk composition in dual-purpose Simmental cows

Daniel Falta, Lenka Zapletalová, Oto Hanuš, Josef Kučera, Milan Večeřa, Gustav Chládek, Radek Filipčík, Tomáš Kopec and Francois Stefanus Lategan
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Daniel Falta: Department of Livestock Science, Mendel University in Brno (FA), Brno, Czech Republic
Lenka Zapletalová: Department of Livestock Science, Mendel University in Brno (FA), Brno, Czech Republic
Oto Hanuš: Dairy Research Institute Ltd, Prague, Czech Republic
Josef Kučera: Czech Moravian Breeders Association, Hradištko, Czech Republic
Milan Večeřa: Department of Livestock Science, Mendel University in Brno (FA), Brno, Czech Republic
Gustav Chládek: Department of Livestock Science, Mendel University in Brno (FA), Brno, Czech Republic
Radek Filipčík: Department of Livestock Science, Mendel University in Brno (FA), Brno, Czech Republic
Tomáš Kopec: Department of Livestock Science, Mendel University in Brno (FA), Brno, Czech Republic
Francois Stefanus Lategan: Department of Livestock Science, Mendel University in Brno (FA), Brno, Czech Republic

Czech Journal of Animal Science, 2023, vol. 68, issue 3, 99-110

Abstract: The aim of this study was to improve the understanding of the contribution of components typically found in milk, but which are not often included in analyses, to the nutritional status of dairy cows. This was undertaken by analysing the amount and composition of milk produced by Simmental dairy cows, a dual-purpose breed farmed in the Czech Republic. Apart from the more frequently analysed group of components in milk, a less frequently analysed group of components were also investigated. This group, typically, consists of the following components: urea, casein, citric acid, beta hydroxy butyrate (BHB) ketones and free fatty acids. The average content of urea, casein and citric acid in milk is 25.75 mg/100 ml, 2.96%, 0.15%, respectively. The influence of environmental factors on these indicators was evaluated, as well as the degree of hereditary establishment. These less frequently analysed components (indicators), as well as the more frequently analysed components of milk, are subject to several external influences, especially the influence of the breeder, the year and the season of calving. The content of these components varied significantly statistically during the lactation period and also in the order of lactation. The influence of a cow's individuality and the degree of additive genetic background are evident, with estimated heritability coefficients ranging from 0.04 for the BHB ketone content to higher values, e.g., 0.28 for citric acid or 0.31 for the lactose content in milk. The relationships between the components of milk and the daily milk yield were also evaluated, and statistically significant negative correlations were found between the content of casein and the daily milk yield (-0.47) and between the lactose content and the number of somatic cells (-0.37).

Keywords: Czech Fleckvieh; dairy; heritability; parity; calving season (search for similar items in EconPapers)
Date: 2023
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlcjs:v:68:y:2023:i:3:id:197-2022-cjas

DOI: 10.17221/197/2022-CJAS

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