Relationships Between and Variation of Cows' Somatic Cell Score and Milk Traits

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43210%2F24%3A43925217" target="_blank" >RIV/62156489:43210/24:43925217 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.15414/afz.2024.27.01.1-7" target="_blank" >https://doi.org/10.15414/afz.2024.27.01.1-7</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.15414/afz.2024.27.01.1-7" target="_blank" >10.15414/afz.2024.27.01.1-7</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Relationships Between and Variation of Cows' Somatic Cell Score and Milk Traits

Popis výsledku v původním jazyce

The objective was to analyse (1) relationships between somatic cell score (SCS) i.e. logarithmic transformation of somatic cell count (SCC) and daily milk yield and milk components (fat, protein and lactose contents), and (2) factors affecting variation of these traits in Hostein cows. Test day records (10,892) from 2015 to 2020 were investigated. Relationships were characterized using linear correlations. Effects of fixed factors: SCC class, parity, month in milk, sampling year and season, and random factors of cow and residual error were evaluated using mixed model. The factor SCC class was omitted in the analysis of SCS. There were found negative correlation coefficients between SCS and milk yield (-0.25) and lactose content (-0.36), and positive correlation coefficients between SCS and fat content (+0.12), and between SCS and protein content (+0.15). The considered fixed factors showed the significant influence on investigated traits. With increasing SCC, milk yield and lactose content decreased and fat and protein contents increased (this pattern agreed with pattern of correlation coefficients). Milk yield, fat and protein contents and SCS were lower in primiparas than in multiparas; lactose content showed the opposite pattern. The lowest milk yield and lactose content were found in autumn; the lowest fat and protein contents were found in summer. The highest SCS found in winter did not confirm a hypothesis that higher temperatures and humidity have impact on cows&apos; susceptibility to infections and the number of pathogens to those cows are exposed. Further research is needed.

Název v anglickém jazyce

Relationships Between and Variation of Cows' Somatic Cell Score and Milk Traits

Popis výsledku anglicky

The objective was to analyse (1) relationships between somatic cell score (SCS) i.e. logarithmic transformation of somatic cell count (SCC) and daily milk yield and milk components (fat, protein and lactose contents), and (2) factors affecting variation of these traits in Hostein cows. Test day records (10,892) from 2015 to 2020 were investigated. Relationships were characterized using linear correlations. Effects of fixed factors: SCC class, parity, month in milk, sampling year and season, and random factors of cow and residual error were evaluated using mixed model. The factor SCC class was omitted in the analysis of SCS. There were found negative correlation coefficients between SCS and milk yield (-0.25) and lactose content (-0.36), and positive correlation coefficients between SCS and fat content (+0.12), and between SCS and protein content (+0.15). The considered fixed factors showed the significant influence on investigated traits. With increasing SCC, milk yield and lactose content decreased and fat and protein contents increased (this pattern agreed with pattern of correlation coefficients). Milk yield, fat and protein contents and SCS were lower in primiparas than in multiparas; lactose content showed the opposite pattern. The lowest milk yield and lactose content were found in autumn; the lowest fat and protein contents were found in summer. The highest SCS found in winter did not confirm a hypothesis that higher temperatures and humidity have impact on cows&apos; susceptibility to infections and the number of pathogens to those cows are exposed. Further research is needed.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

40201 - Animal and dairy science; (Animal biotechnology to be 4.4)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Acta Fytotechnica et Zootechnica

ISSN

1335-258X

e-ISSN

1336-9245

Svazek periodika

27

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

SK - Slovenská republika

Počet stran výsledku

7

Strana od-do

1-7

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-85191955009