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Variation in bovine milk stability according to lactational stage and genetic group.
Schmitz, Bruna; Costa, Olmar Antônio Denardin; Fluck, Ana Carolina; de Borba, Leonardo Piffer; Rangel, Adriano Henrique do Nascimento; Fischer, Vivian.
Afiliación
  • Schmitz B; Postgraduate Program in Animal Science, Federal University of Rio Grande Do Sul, Porto Alegre, RS, Brazil.
  • Costa OAD; Postgraduate Program in Animal Science, Federal University of Technology of Paraná, Dois Vizinhos, PR, Brazil.
  • Fluck AC; Federal Institute of Education, Science and Technology of Farroupilha (IFFar), Santo Ângelo, RS, Brazil.
  • de Borba LP; Postgraduate Program in Animal Science, Federal University of Technology of Paraná, Dois Vizinhos, PR, Brazil.
  • Rangel AHDN; Postgraduate Program in Animal Science, Federal University of Rio Grande do Norte, Natal, RN, Brazil.
  • Fischer V; Postgraduate Program in Animal Science, Federal University of Rio Grande Do Sul, Porto Alegre, RS, Brazil.
J Dairy Res ; : 1-6, 2024 Sep 16.
Article en En | MEDLINE | ID: mdl-39282731
ABSTRACT
We address the hypothesis that at early and late lactation milk presents low ethanol stability due to high acidity and ionic calcium values. Our aim was to evaluate the functional traits of milk (milk ethanol stability MES, acidity and ionic calcium iCa) according to lactation stage in different genetic groups. Raw milk samples were collected from Jersey (n = 271), Holstein (n = 248) and Jersey × Holstein crossbred cows (n = 82), raised on five commercial farms located in the state of Paraná, Brazil. Milk composition, somatic cell count (SCC), milk urea nitrogen (MUN), MES, pH, acidity and iCa were determined. Days in milk (DIM) were categorized into four classes 1-60, 61-150, 151-305 and over 305 DIM. Data were submitted to analysis of variance. Fixed and random effects were incorporated into the model, in a repeated measures in time arrangement using the mixed models methodology. Significant interactions between DIM class and genetic groups were detected. The comparison between each combination of genetic group and DIM class showed that at the beginning of lactation, Holsteins produced milk with higher MES than Jersey and crossbreds. At 105-305 DIM Holstein milk presented higher MES than Jersey, while beyond 305 DIM Holstein milk showed higher MES than crossbred cows. At the beginning of lactation acidity was higher in Holstein milk and crossbreds compared with Jersey, while acidity was lower in Holstein milk compared with Jersey and crossbreds in the other lactation stages. Ionic calcium was highest after lactation peak for Holstein, but did not vary between lactation stages for Jersey and crossbreds. Functional characteristics of bovine raw milk such as MES, iCa and acidity varied between lactation stages in a distinct manner according to genetic groups. Early and end lactation stages are challenging in terms of low stability, especially for Jersey and crossbreds.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Dairy Res Año: 2024 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Reino Unido
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Dairy Res Año: 2024 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Reino Unido