Reference : Genetic parameters of stearoyl coenzyme-A desaturase 9 activity estimated by test-day...
Scientific congresses and symposiums : Unpublished conference/Abstract
Life sciences : Food science
Life sciences : Genetics & genetic processes
Genetic parameters of stearoyl coenzyme-A desaturase 9 activity estimated by test-day model
Arnould, Valérie mailto [Université de Liège - ULiège > Sciences agronomiques > Zootechnie >]
Gengler, Nicolas mailto [Université de Liège - ULiège > Sciences agronomiques > Zootechnie >]
Soyeurt, Hélène mailto [Université de Liège - ULiège > Sciences agronomiques > Zootechnie >]
[en] Delta-9 desaturase ; Genetic parameters ; Dairy Cattle
[en] Dairy and beef products account for a large part of fat intake in human nutrition and therefore can be linked to dietary diseases. The stearoyl Coenzyme-A desaturase 9 (delta-9) gene was identified as a potential functional candidate gene affecting milk fat composition in dairy cattle. The objective of this research was to estimate the genetic parameters of delta-9 activity indicator traits and to study the relationship between delta-9 activity as described by these indicator traits and common milk production traits. A total of 126,331 test-day records were obtained from 14,259 Holstein (> 84% Holstein gene) heifers belonging to 105 herds. The studied traits were milk yield, percentages of fat and protein, content of monounsaturated fatty acids, and 3 ratios reflecting the delta-9 activity (C14:1/ C14:0; C16:1/C16:0 and C18:1/C18). The used model was a multiple-trait random regressions test-day model and included as fixed effects: herd x date of test, class of age, and month x year. Random effects were herd x year of calving, permanent environmental, additive genetic, and residual effects. The fatty acid contents were estimated by mid-infrared spectrometry. Delta-9 activity varied within year and lactation. The obtained heritability estimates of delta-9 as well as the genetic and phenotypic correlation varied also through lactation. This study suggests potential improvements of delta-9 activity and subsequently milk fat composition can be achieved by animal management but also by breeding and animal selection.
Publisher copyright and source are acknowledged

File(s) associated to this reference

Fulltext file(s):

Open access
ADSA_2008p.pdfPublisher postprint346.69 kBView/Open

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.