Dairy Cattle Health Traits
Healthy cattle that transition well, breed back easily and last in the herd positively impact your bottom line. For that reason, we are and always have been dedicated to ongoing genetic improvement in health traits. This dedication has led to GENEX proprietary health traits based on data-driven innovation.
Today we have two Jersey-specific proprietary traits: Age at First Calving (AAFC) and Calf Survivability (CSRV). Both are incorporated into the ICC$™ index for Jerseys to help you breed healthier herds of ideal commercial cows.
Age at First Calving (AAFC)
AAFC highlights the importance of daughter fertility within the Jersey breed. Lowering age at first calving has a positive impact on profitability through improved fertility, higher milk production and limited impact on stillbirths.1 Therefore getting heifers calved in with a proper age at first calving equals bottom-line profit.
What you need to know about AAFC:
» The breeding value is set to a base of 100.
» Higher values indicate a sire’s daughters grow and mature faster, becoming reproductively viable at a younger age.
» You can expect about a 44-day difference in age at first calving between daughters of a 105 AAFC sire and daughters of a 95 AAFC sire.
» AAFC is based on Jersey-specific information in the GENEX dairy research database which totals 54 million health records on nearly 12 million cows.
» The breeding value has a 18.7% heritability.
» AAFC is a component of the Fertility (FERT$) sub-index within the ICC$™ index for Jerseys. To improve herd fertility, choose sires based on the ICC$™ index and then the FERT$ sub-index.
Calf Survivability (CSRV)
This health trait brings awareness to genetics that instill hardiness and survivability in newborn calves, which is a continual area of concern for Jersey producers. Demonstrating its significance, the GENEX research database shows that approximately 6.5% of Jersey calves die between days 2 and 120 of age.2
What you need to know about CSRV:
» The breeding value is set to a base of 100, with higher values more desirable.
» It reflects the percent of female calves that survive past 120 days of age (excluding calves sold).
» You can expect about a 5.5% difference in calf survivability between daughters of a 105 CSRV sire and daughters of a 95 CSRV sire.
» CSRV is based on Jersey-specific information in the GENEX dairy research database which totals 54 million health records on nearly 12 million cows.
» CSRV is a component of the Sustainability (SUST$) sub-index within the ICC$™ index for Jerseys.
To learn more about breeding for a healthier herd through data-driven innovation, reach us online, contact your local GENEX representative or call customer service at 888.333.1783.
1 J.A.A. McArt, D.V Nydam, M.W. Overton, Journal of Dairy Science, Volume 98, Issue 3, 2015, 2043-2054.