AGRONOMIJAS VĒSTIS - Latvijas Lauksaimniecības universitāte

AGRONOMIJAS VĒSTIS (Latvian Journal of Agronomy), No.10, LLU, 2008The 1 st position in two groups has two bulls: the bull of ZS breed (HB No. 31109) showedEBV results from 35.5 kg to 37.3 kg when fixed HTD effect included in the model was used, thebull of HS breed (HB No. 31352) showed EBV results from 58.4 kg to 59.9 kg when fixed DTDeffect included in the model as used.Table 5. The best bulls by EBV of protein yield, kg (REL ≥ 50 %)RankTDM (I) TDM (II) TDM (III) TDM (IV)HB No. EBV HB No. EBV HB No. EBV HB No. EBV1 31109 35.5 31352 58.4 31109 37.3 31352 59.92 29616 32.0 31415 49.3 29616 34.3 31415 52.83 31108 29.6 31488 43.9 31108 33.1 31399 45.24 31352 28.0 31485 43.6 31352 29.8 31485 43.85 31488 28.0 31277 41.7 31110 29.4 31277 43.16 31393 27.8 31109 41.1 31415 28.5 31488 42.07 31413 27.2 31399 38.5 31488 28.1 31109 41.08 31277 26.0 29616 37.3 31393 28.1 31393 37.59 31110 25.8 31393 36.8 31413 26.7 29616 35.810 31415 25.4 31110 35.5 31277 26.4 31413 35.6The calculation of reliability is a measure of accuracy. It provides a measure of the degreeof risk associated with the evaluation. Reliability measurements using TDM and LM are shown inTable 6.The average reliability of bulls are in the range from 70 % to 82 % for milk yield, from 69% to 81 % for fat yield and from 72 % to 83 % for protein yield. Using LM these values are 67 %,63 % and 63 %, respectively for milk, fat and protein yield. It showed that using TDM reliabilityrates are higher by 3 % to 20 %. Higher differences of reliability are obtained for protein yield (3 –15 %), but lower for milk yield (9 – 20 %) using results from both TD and LM.Reliability estimates are higher for younger sires using TDM. The differences betweenTDM and LM estimates are from 2 % – 17 % for older sires and 14 % – 27 % for younger sires.It is possible to include different number of daughters in the evaluation using a differentmodel at the same time. There are 7 daughters per sire more in average using TDM. Resultsshowed that the number of daughters per sire increases by birth year, int. al. for younger sires.Table 6. Reliability (REL) of productivity traits, %ParameterModelBirth year of bullsIninformation