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Table 1 Biological, economical and technical parameters of the breeding program

From: Optimising multistage dairy cattle breeding schemes including genomic selection using decorrelated or optimum selection indices

parameter unit value
h2 milk trait   0.25
phenotypic standard deviation kg 700
accuracy GEBV1   0.3 - 0.9
age at first calving month 26
time between calving month 12
length of lactation month 10
maturity of test bulls month 14
number of daughters per sire head 993
insemination with test bulls % 20
average age of bull calves at purchase month 6
price of bull calves 4 000
keeping costs of bull calves until maturity /day 5
keeping costs of test bulls /day 4.5
cost for genomic selection2 25 - 400
population of cows head 100 000
demand for cow sires head/year 10
demand for bull sires head/year 5
initial male selection candidates head/year 500
demand for bull dams (contract matings) head/year 1000
compensation payments for test bull matings /test bull 3 000
compensation payments to breeders for keeping genotyped selection candidates /candidate 150
maximum breeding program costs /year 719 050
Lss4 (PED5, GS6, PPT7) months 23, 23, 71
LSD8 (PED, GS, PPT) months 23, 23, 61
LDS9 (PED, GS) months 26, 26
  1. 1: estimated genomic breeding values, 2: per genotyped individual, includes DNA isolation, genotyping and calculation of breeding values, 3: minimum number, recalculated according to the number of bulls entering the progeny testing stage, 4: generation interval in the path "sire-sire" as a function of the final selection stage, 5: selection stage selecting on ancestor and sib performance and GEBV, 6: selection stage selection on candidate's GEBV, 7: selection stage selecting on candidate's progeny performance, 8: generation interval in the path "sire-dam" as a function of the final selection stage, 9: generation interval in the path "dam-sire" as a function of the final selection stage