Phenotypic variation of milk fatty acid composition of Pinzgauer cattle breed
Manuelian, Carmen L (Universitat Autònoma de Barcelona. Departament de Ciència Animal i dels Aliments)
Visentin, Giulio (Università degli Studi di Padova)
Penasa, Mauro (Università degli Studi di Padova)
Cassandro, Martino (Università degli Studi di Padova)
De Marchi, M (Università degli Studi di Padova)

Data:	2018
Descripció:	4 pàg.
Resum:	This paper investigated sources of variation of milk fatty acid (FA, g/100 g total FA) profile routinely predicted by mid-infrared spectroscopy in Pinzgauer dual-purpose cattle breed. A total of 19,578 individual milk samples collected from 1232 cows and 77 herds between 2011 and 2014 were available for phenotypic characterisation. Data were analysed using a linear mixed model which included stage of lactation, parity and their interaction as fixed effects, and cow and herd-test-day as random effects. Milk yield averaged 20. 87 kg/d, and means for fat, protein and casein were 4. 01, 3. 44 and 2. 72%, respectively. Saturated FA (SFA), monounsaturated FA (MUFA) and polyunsaturated FA (PUFA) averaged 69. 20, 25. 43 and 3. 19 g/100 g total FA, respectively. About half of the SFA were provided by C16:0 (31. 24 g/100 g total FA), and almost all MUFA by C18:1 (22. 18 g/100 g total FA). Fixed effects were significant in explaining the variation of the studied traits. Milk of first-parity cows had the lowest percentage of SFA, medium-chain FA and C14:0, and the greatest percentage of MUFA, PUFA, trans FA, short- and long-chain FA, and C18:1. Saturated FA, C14:0 and C16:0 increased from calving until 120 days in milk, whereas unsaturated FA, MUFA, PUFA, long-chain FA, C18:0 and C18:1 decreased. Although both parity and stage of lactation affected milk FA, greater variation was observed during lactation than among parities.
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Matèria:	Cow milk ; Local breed ; Mountain area ; Polyunsaturated fatty acid
Publicat a:	Italian journal of animal science, Vol. 17 Núm. 3 (2018) , p. 574-577, ISSN 1828-051X

DOI: 10.1080/1828051X.2017.1416685

5 p, 1.2 MB

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