Evaluation of the milk urea content in relation to milk production and composition in dairy cows

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The aim of this study was to evaluate the milk urea content along with the dynamics of lactation and milk components in production dependency in Holstein dairy cows. Evaluation of daily milk yield in relation to milk urea presented a positive regression dependency, which was the strongest in early lactation (r = 0.860; P < 0.001), decreasing in mid lactation (r = 0.329; P < 0.001) and late lactation (r = 0.261; P < 0.001). Evaluation of milk protein in relation to milk urea showed a negative regression dependency, which was the strongest in early lactation (r = -0.850; P < 0.001), decreasing in mid lactation (r = -0.819; P < 0.001) and late lactation (r = -0.679; P < 0.001). The somatic cell counts in relation to milk urea confirmed a negative regression dependency in early lactation (r = -0.635; P < 0.05) and mid lactation (r = -0.818; P < 0.05), but no significance was found in late lactation. The results of the study confirm the influence of production factors (milk quantity and milk components) on the milk urea content. Dependencies found between the production, milk components and milk urea are applicable for the evaluation of protein nutrition and metabolic transformation of nutrients in dairy cows. … celý popis

Podrobná bibliografie

Hlavní autor

Petra Timkovičová Lacková

Další autoři

Iveta Maskaľová
Vladimír Vajda, 1948-

Typ dokumentu

Články

Fyzický popis

Ilustrace

Publikováno v

Acta veterinaria. -- ISSN 0001-7213. -- Roč. 88, č. 3 (2019), s. 277-285

Témata

méně…

DAIRY CATTLE

Livestock breeds

DAIRY COWS

LACTATION

ANIMAL DEVELOPMENTAL STAGES

MILK YIELD

COW MILK

CHEMICAL COMPOSITION

UREA

MILK PROTEIN

MILK FAT

LACTOSE

SOMATIC CELL COUNT

STATISTICAL METHODS

ANIMAL NUTRITION

MILKING

TIMING

skot holštýnský

stádium laktace

mléčný skot

plemena hospodářských zvířat

dojnice

laktace

etapy vývoje zvířat

dojivost

kravské mléko

chemické složení

močovina

mléčná bílkovina

mléčný tuk

laktóza

počet somatických buněk

statistické metody

výživa zvířat

dojení

načasování

více… méně…

Popis jednotky

3 grafy, 2 tabulky

Bibliografie

Literatura na s. 285