|Cow number 8798
freshened eight days ago. The cow appears to be transitioning well, at least
from the outside. What you can’t see is what’s going on inside of her. Now,
however, GENEX is providing you with a new way to genetically select for
animals that are healthier and transition well. |
limiting early lactation metabolic disease is key to getting animals off to the
right start. Now, GENEX is offering members and customers another way – a
genetic way – to control and limit
ketosis. GENEX has published a Subclinical
Ketosis (SCK) breeding value, an industry-leading comprehensive measure that
takes into consideration both clinical (observed) and subclinical ketosis. This new breeding value is a prime example of the
cooperative’s dedication to data-driven innovation for the genetic improvement
of members’ herds.
Subclinical Ketosis Impacts
ketosis has a 40-60% incidence rate with a large percentage of fresh
cows never exhibiting symptoms. For the advanced clinical condition, the
incidence rate is 10-15%.
Research conducted by the cooperative's research arm, known as the CRI ICB, indicates cows with subclinical ketosis have:
- 3.4-8.2 lbs less peak milk yield
- 14,000-18,000 higher somatic cells during lactation
- 3-4% higher likelihood of developing a DA
- 5-7% lower first service conception rates
- 5-8% higher cull rates
- BHBA levels ≥ 1.2 mmol
The severity of subclinical ketosis impacts increases with lactation number or if onset occurs with fewer days in milk. These impacts lead to an average cost of $289 per case of subclinical ketosis.1
In addition, a recent article by Dr.
Barry Bradford and Gail Carpenter of Kansas State University stated that
ketosis and other early lactation diseases go hand in hand. This confirms an
animal that is positive for ketosis is more susceptible to other early
lactation metabolic diseases.
SCK Breeding Value
SCK has a base of 100. If sire A is 105 and sire B is 95, then daughters of sire A are expected to average 0.185 lower for predicted blood beta-hydroxybutate (BHBA). SCK heritability is 11.9%.
Selection for improved animal
health will be made when SCK is used in conjunction with sire selection
criteria like the Ideal Commercial Cow (ICC$) index SCK Development
SCK is calculated using data from the KetoMonitor® management tool which monitors herd ketosis prevalence through layering of milk-based diagnostics and individual cow data. KetoMonitor®, available from AgSource Cooperative Services, was developed in conjunction with the University of Wisconsin-Madison Department of Dairy Science and School of Veterinary Medicine. This was followed by additional research and breeding value calculation by CRI ICB staff.
Industry Leader for
When choosing sires, remember SCK is …
- An industry-leading
breeding value selecting for both clinical and subclinical ketosis.
- A genetic selection tool
to help manage the costs associated with subclinical ketosis, such as lost
production, early culling, decreased reproductive performance and subsequent
- A valuable sire
selection tool to improve cow health when used in combination with the ICC$
- The result of
collaboration between the University of Wisconsin-Madison Department of Dairy
Science and School of Veterinary Medicine, AgSource, the CRI ICB and GENEX.
1 J.A.A. McArt, D.V. Nydham, M.W. Overton, Journal of Dairy Science, Volume 98, Issue 3, 2015, 2043-2054