Title
Milk fat saturation and reproductive performance in dairy cattle Milk fat saturation and reproductive performance in dairy cattle
Author
Faculty/Department
Faculty of Pharmaceutical, Biomedical and Veterinary Sciences. Veterinary Sciences
Publication type
article
Publication
Amsterdam ,
Subject
Biology
Source (journal)
Animal reproduction science. - Amsterdam
Volume/pages
141(2013) :3-4 , p. 116-123
ISSN
0378-4320
ISI
000326422300002
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
Unsaturated fatty acids (UFA) cannot be synthesized by mammalian cells due to a lack of desaturase enzymes. Combined with their limited supply to the small intestines, UFA have been proposed as nutraceuticals to ameliorate dairy cow fertility. However, field studies based on a large number of animals are lacking on this subject. Therefore the aim of the present study was to analyze a large dataset containing individual cow fertility records from dairy herds and link fertility key-performance-indicators like conception rate to first insemination (CRFI), days in milk to first insemination (DIMFI) and days in milk to conception (DIMCONC), to the level of UFA in bulk tank samples, the latter being a proxy for the dietary fatty acid profile on these herds. Within the two year study period, information from 15,055 lactations and 35,433 bulk tank milk samples was collected on 90 herds. The multilevel logistic regression model used, revealed a decreased CRFI on herds with a higher bulk tank UFA level. The decrease in CRFI was larger for higher producing herds. Increased bulk tank UFA was furthermore associated with higher DIMFI which, together with the lower CRFI, subsequently increased DIMCONC. Interestingly, higher variability in UFA, expressed by an increased coefficient of variation, was associated with an increased CRFI and decreased DIMFI and DIMCONC. In conclusion, the present study demonstrates that increasing the UFA content of milk should not be a goal as such when supplementing UFA to dairy cows as higher bulk tank UFA are associated with worsened fertility results. (C) 2013 Elsevier B.V. All rights reserved.
E-info
https://repository.uantwerpen.be/docman/iruaauth/8aa712/2216342.pdf
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