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Hot Carcass Weight: Difference between revisions

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===Contemporary Group===
===Contemporary Group===
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A contemporary test group is a set of cattle of the same sex that have been raised together and have received equal treatment up to the point  of  slaughter.    All  progeny  within  a  contemporary  group  should  be  born within  a  90-day  period,  and  male  calves  must  be  castrated prior  to  150  days  of age.  A contemporary group up to the time of weaning will be subdivided if some cattle go on feed as calves and others are started on feed as yearlings, and if the cattle  are  then  split  into two  or  more  slaughter  groups.  Birth date, identification of sire and dam,  breed  of  dam  (or  breed  proportions  in  crossbred  dams) should be recorded for all individuals.
A contemporary group is a set of cattle of the same sex that have been raised together and have received equal treatment up to the point  of  slaughter.    All  progeny  within  a  contemporary  group  should  ideally be  born within  a  90-day  period,  and  male  calves  must  be  castrated.  A contemporary group up to the time of weaning will be subdivided if some cattle go on feed as calves and others are started on feed as yearlings, and if the cattle  are  then  split  into two  or  more  slaughter  groups.  Birth date, identification of sire and dam,  breed  of  dam  (or  breed  proportions  in  crossbred  dams) should be recorded for all individuals.


===Genetic Evaluation===
===Genetic Evaluation===

Revision as of 16:09, 12 December 2019


Phenotype

The weight of the carcass as it leaves the slaughter floor measured by a digital scale.

Adjusted Value

Hot carcass weight is adjusted to an age constant.

Contemporary Group

A contemporary group is a set of cattle of the same sex that have been raised together and have received equal treatment up to the point of slaughter. All progeny within a contemporary group should ideally be born within a 90-day period, and male calves must be castrated. A contemporary group up to the time of weaning will be subdivided if some cattle go on feed as calves and others are started on feed as yearlings, and if the cattle are then split into two or more slaughter groups. Birth date, identification of sire and dam, breed of dam (or breed proportions in crossbred dams) should be recorded for all individuals.

Genetic Evaluation

Carcass weight is generally included in a multiple-trait model with other carcass traits such as ribeye area (carcass and ultrasound). An early growth trait (e.g., birth or weaning weight) may also be included to account for sequential culling if the genetic covariance is sufficient. Only direct genetic effects are fitted.

Usage

Hot carcass weight is an economically relevant trait given it represents a direct source of revenue, particularly for those producers that retain ownership of fed cattle and sell the animals on a carcass basis.