Genetic evaluation for ketosis in the Netherlands based on FTIR measurements
Keywords:ketosis, dairy cattle, FTIR, genetic evaluation, genetic parameters
Ketosis is one of the most common disorders in dairy cows during the early stages of lactation. In the first 60 days after calving, dairy cows are often lacking energy, which can cause metabolic diseases such as ketosis. Since 2012, cows are routinely checked for ketosis in the regular milk recording scheme. The indication for ketosis is based on FTIR measurements of milk acetone and milk beta hydroxybutyric acid (mBHBA). The ketosis indicator also includes fat-protein ratio, lactation number and month of milking. The incidence of ketosis in the Netherlands is 12.2 percent. Using 2.5 million ketosis observations of 1.25 million cows, genetic parameters were estimated with a multi-trait sire model. Heritability for ketosis for lactation 1 was 0.16, for lactation 2 was 0.13, and for lactation 3 was 0.18. Genetic correlation was 0.81 between lactation 1 and 2, 0.58 between lactation 1 and 3, and 0.74 between lactation 2 and 3. In 2014, a routine genetic evaluation was introduced. Breeding values are published as relative breeding value with average of 100 and standard deviation of 4 points, with a higher value resulting in less ketosis. One genetic standard deviation represents 3% ketosis. The genetic trend in the population is slightly positive, resulting in less ketosis. Correlation between ketosis and milk production yield traits are slightly negative, with fertility traits slightly positive (less ketosis results in better fertility results).
LicenseAuthors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).