Page 4 - Riverlee 2020 v2
P. 4

EBV’S EXPLAINED


       CALVING EASE: DIR - Indicates how easily this   and for dam age. This EBV is the best single
       bull’s progeny are likely to be born  estimate of an animal’s genetic merit for growth
                                            beyond yearling age.
       DTRS - Indicates how easily this bull’s
       daughters are likely to calve. More positive   MV - Maternal Value EBV is an index of the
       EBVs indicate easier calving.        EBVs for the 200-Day Growth and 200-Day Milk,
                                            and is calculated by the following formulae: For
       BIRTH: BWT - Birth Weight EBV (kg) is based
                                                     1
                                                                1
                                            sires:  MV =  /2 Milk EBV +  /4 200-Day Growth
       on the measured birth weight of animals,
                                                                      1
                                            EBV.    For dams:  MV = Milk EBV +  /2 200-Day
       adjusted for dam age. The lower the value the
                                            Growth EBV.
       lighter the calf at birth and lower the likelihood
       of a difficult birth. This is particularly important   MCW - Mature Cow Weight is an estimate of
       when selecting sires for use over heifers.  the genetic difference in cow weight between
                                            animals at five years of age.MCW EBVs for
       FERTILITY: SS - Scrotal Size (cm) is an
                                            sires are based on weights recorded on their
       indicator of male fertility in regards to semen
                                            daughters. Smaller or more moderate MCW
       quality and quantity. Higher (positive) EBVs
                                            EBVs are generally more favourable as they
       indicate higher fertility. SS is also positively
                                            indicate more efficient cows requiring less feed
       associated with female fertility.
                                            for maintenance.
       GROWTH: Milk - 200-Day Milk EBV (kg) is an
                                            CARCASE: CWT - Carcase Weight EBV (kg)
       estimate of an animal’s milking ability. For sires,
                                            estimates the genetic difference in carcase
       this EBV is indicative of their daugthter’s milking
                                            weight at a standard age of 650 days. More
       ability as it affects the 200 day weight of their
                                            positive EBVs indicate heavier carcases at 650
       calves.
                                            days of age.
       200 - 200-Day Growth EBV (kg) is calculated
                                            EMA - Eye Muscle Area EBV (CM2) Estimates
       from the weight of animals taken between 80
                                            genetic differences in eye muscle area at the
       and 300 days of age. Values are adjusted to
                                            12/13th rib site of a 300kg dressed carcase.
       200 days and for dam age. This EBV is the best
                                            More positive EBVs indicate better muscling on
       single estimate of an animal’s genetic merit for
                                            animals.
       growth to early ages.
                                            RIB - Rib Fat EBV (mm) estimates the genetic
       400 - 400-Day Weight EBV (kg) is calculated
                                            differences in fat depth at the 12/13th rib in a
       from the weight of progeny taken between 301
                                            300kg dressed carcase. More positive EBVs
       and 500 days of age, adjusted to 400 days
                                            indicate more subcutaneous fat and earlier
       and for dam age. This EBV is the best single
                                            maturity.
       estimate of an animal’s genetic merit for yearling
       weight.                              RUMP - Rump Fat EBV (mm) estimates the
                                            genetic differences in fat depth at the P8 site
       600 - 600-Day Weight EBV (kg) is calculated
                                            on a 300kg dressed carcase. More positive
       from the weight of progeny taken between 501
                                            EBVs indicate more  subcutaneous fat and
       and 900 days of age, adjusted to 600 days
       2  -  RIVERLEE HEREFORD BULL SALE
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