Acta Univ. Agric. Silvic. Mendelianae Brun. 2012, 60(1), 29-38 | DOI: 10.11118/actaun201260010029

Changes in milk fatty acid composition in relation to indicators of energy balance in Holstein cows

Jaromír Ducháček, Mojmír Vacek, Luděk Stádník, Jan Beran, Monika Okrouhlá
Katedra speciální zootechniky, Česká zemědělská univerzita v Praze, Kamýcká 129, 165 21 Praha 6 - Suchdol, Česká republika

The contents of protein (P), fat (F), a F:P ratio, and content of individual fatty acids (FA) and groups of FA, including ratio of SFA:UFA (saturated FA-to-unsaturated FA) and MUFA:PUFA (ratio monounsaturated FA-to-polyunsaturated FA) in milk during the first 17 weeks of lactation with respect to the development of NEB demonstrated by the change in cows' body condition. The differences in fat content were more pronounced than those in protein content. The resulting changes of the fat-to-protein ratio over time are associated with adipose tissue mobilization due to NEB, which was also confirmed by the changes in the BCS during the experimental period. The results indicate the possibility of using both fat content and fat-to-protein ratio as indicators of NEB in early lactation cows. The highest concentrations of saturated FA (SFA) were observed for C14:0, C16:0, C18:0, and also for the SFA with low carbon numbers. The highest concentrations of unsaturated FA (UFA) were determined for C18:1, C18:2, and C16:1. The significant difference in SFA:UFA between cows with decreasing of the BCS and cows without big change in the BCS after calving were not found. The changes in MUFA:PUFA in milk during the first 5 weeks of lactation differed between the cows with low and high decrease of BCS one month after calving. In cows with a greater NEB effect was observed ratio of PUFA:MUFA in milk with a value above 6.5. The results suggest the possibility of using MUFA:PUFA ratios as suitable indicators of NEB in cows after calving.

Keywords: NEB, body condition, fat-to-protein ratio, fatty acids in milk, PUFA:MUFA ratio
Grants and funding:

This study was supported by projects NAZV QH91270, MSM 6046070901, and FRVŠ G4/1443/2011.

Received: November 10, 2011; Prepublished online: October 5, 2013; Published: October 9, 2013  Show citation

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Ducháček, J., Vacek, M., Stádník, L., Beran, J., & Okrouhlá, M. (2012). Changes in milk fatty acid composition in relation to indicators of energy balance in Holstein cows. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 60(1), 29-38. doi: 10.11118/actaun201260010029
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