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, Massimo (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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