home    about    browse    search    latest    help 
Login | Create Account

Realization of breeding values for milk fatty acids in relation to seasonal variation in organic milk

Poulsen, Nina Aagaard; Hein, Lisa; Kargo, Morten and Buitenhuis, Albert Johannes (2020) Realization of breeding values for milk fatty acids in relation to seasonal variation in organic milk. Journal of Dairy Science, 103 (3), pp. 2434-2441.

[thumbnail of Poulsen et al 2020 JDS 103 2434-2441.pdf] PDF - Published Version - English
Limited to [Depositor and staff only]

575kB

Document available online at: https://www.sciencedirect.com/science/article/pii/S0022030220300497


Summary

Prediction of detailed milk fatty acid (FA) composition by mid-infrared spectroscopy (MIRS) offers possibilities for high-throughput indirect measurements of detailed milk compositional parameters through the milk testing system, which can be used to differentiate the FA profile by genetics or specific management or on dairies for milk quality evaluation. Since 2015, milk samples from all Danish dairy cows under milk testing have been recorded using MIRS. The MIRS software from the FOSS Application Note 64 was used to predict contents of 7 FA groups and 4 individual FA. Data generated from the application note have been used to estimate breeding values for sires for percentage of saturated fat (SFA%) in milk. To investigate whether extreme SFA% breeding values of sires were reflected in the detailed milk FA profile from their daughters, milk samples from 194 cows in 7 organic herds were collected and the detailed FA composition measured by gas chromatography. From each cow, milk samples were collected twice to explore specific seasonal effects of pasture-based diets in relation to sires' estimated breeding value (EBV) for MIRS-predicted SFA% (MIRS-SFA%). The results showed a significant difference in SFA% measured from GC (GC-SFA%) in milk from daughters of sires having high SFA% EBV compared with daughters of sires having low SFA% EBV. The EBV group (low or high) also significantly affected most FA except C13:0, C15:0, C17:0, and C18:1 trans-11. Contents of SFA with even chain-lengths were all higher in the high EBV group, whereas C14:1, C16:1, and the other unsaturated C18 FA had a higher content in the low EBV group. All FA were significantly affected by season. The SFA% decreased from indoor spring feeding to summer pasture, as did FA with chain length ≤16 carbons, whereas long-chain FA (>C17) all increased during summer pasture. The results show that use of MIRS-predicted EBV for SFA% will most likely display a correlated response on the detailed FA composition in milk. In the current study, the combined action of feeding and genetics resulted in a 10 percentage-point difference on average when comparing milk SFA% from daughters of high SFA% EBV sires during indoor spring feeding from one farm to milk SFA% from daughters of low SFA% EBV sires during summer from another farm.


EPrint Type:Journal paper
Keywords:fatty acids, gas chromatography, pasture, mid-infrared spectroscopy
Agrovoc keywords:
Language
Value
URI
English
fatty acids
http://aims.fao.org/aos/agrovoc/c_2818
English
pastures
http://aims.fao.org/aos/agrovoc/c_5626
Subjects: Animal husbandry > Production systems > Dairy cattle
Animal husbandry > Breeding and genetics
Animal husbandry > Health and welfare
"Organics" in general > Countries and regions > Denmark
Research affiliation: Denmark > AU - Aarhus University > AU, DJF - Faculty of Agricultural Sciences
Denmark > ICROFS - International Centre for Research in Organic Food Systems
Denmark > GUDP
Denmark > SEGES
Denmark > Organic RDD 2 > SOBcows
ISSN:0022-0302
DOI:10.3168/jds.2019-17065
Deposited By: Villemoes, Jette Odgaard
ID Code:37258
Deposited On:24 Mar 2020 11:08
Last Modified:02 Mar 2022 11:44
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

Repository Staff Only: item control page

Downloads

Downloads per month over past year

View more statistics