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Title

Adding plant oils to dairy goat diets: Changes in milk fatty acids with sampling time

AuthorsMartínez Marín, A. L.; Gómez-Cortés, Pilar ; Gómez Castro, G.; Juárez, Manuela ; Pérez Alba, L. M.; Pérez Hernández, M.; Fuente, Miguel Ángel de la
KeywordsFatty acid
Plant oil
Dairy goat
Issue Date2012
CitationJAM 2012
AbstractKnowing the time at which the responses to dietary plant oil addition are clear in milk fat could shorten experimental periods and give clues on rumen and mammary metabolism of fatty acids (FA). Our aim was to find out changes in milk fat FA composition from 1 h to 21 d after introducing 3 differently unsaturated plant oils in dairy goat diets. Twelve midlactation multiparous goats were randomly allocated to one of 4 dietary treatments: Control (basal diet, no added oil) or the same basal diet added with 48 g/d of either high oleic sunflower oil, regular sunflower oil (RSO), or linseed oil (LO). Basal diet was made of alfalfa hay (0.33) and pelleted concentrate (0.67). Milk samples were taken at 0 (covariate), 1, 12, 24, 72, 120, 192, 312 and 504 h. Milkings at 0, 1 and 12 h were stripped out by hand after an intravenous dose of oxytocin. Analysis of fatty acid methyl esters (FAME) was performed by gas chromatography. MIXED procedure of SAS was used to analyze milk fat FA contents (g/100 g total FAME). Seventy 2 FA were identified and quantified in milk fat. The same differences between Control and oil treatments found at 504 h were also observed at 312 h in 12 chosen relevant FA, 5 sums of FA (saturated, mono- and polyunsaturated, total trans-18:1 and total conjugated linoleic acid) and linoleic to α-linolenic acid ratio. Both vaccenic (VA) and rumenic acid (RA) contents with LO treatment started showing differences with Control at 12 h (1.65 vs. 0.61; P < 0.001 and 0.60 vs. 0.30; P < 0.001). Between RSO and Control, differences of VA contents started at 12 h (1.87 vs. 0.69; P = 0.016) and that of RA at 24 h (0.79 vs. 0.36; P = 0.048). Content of α-linolenic acid with LO was different of Control at 1 h (0.18 vs. 0.13; P = 0.019); this difference increased at 12 h (0.34 vs. 0.13; P < 0.0001) and kept growing until 504 h (0.73 vs. 0.17; P < 0.0001). Reliable results of milk FA changes can be obtained at sampling times lower than 21 d and these modifications can help in the study of rumen and mammary metabolism of dietary FA.
DescriptionResumen del póster presentado al ADSA-AMPA-ASAS-CSAS-WSASAS Joint Annual Meeting celebrado en Phoenix (US) del 15 al 19 de julio de 2012.
URIhttp://hdl.handle.net/10261/114638
Appears in Collections:(CIAL) Comunicaciones congresos
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