USED OF TEST DAY RECORDS FOR GENETIC EVALUATION OF HOLSTEIN IN INDONESIA
Heni Indrijani, Asep Anang, Jan Alex Siwi
This research addressed to study the use of test day records for genetic evaluation of dairy cattle at Indonesia. Total of 6698 records from first lactation and 5504 records from second lactation, resulted from 1293 dams and 69 bulls were evaluated. The results indicated that estimates of heritability ranged from 0.06 to 0.41. Genetic merit can be raised by mass selection. Based on the correlation of breeding values among test day records. Selection of animals at Taurus Dairy Farm can be conducted based on full test day records of first lactation plus one test day record in the second lactation, whereas selection for bull is extended into second test day in the second lactation, but selection of animals at BPPT Cikole Lembang can be conducted based on full test day records of first lactation plus six test day record in the second lactation, whereas selection for bull is extended into eigth test day in the second lactation. It conclude that the best model to estimate breeding value was fixed regression test day model (FRTDM) because the evaluation can be conducted simultaneously on the same day although the level of lactation among dairy cows was different.
Key words: dairy cattle, test day, heritability, breeding value, fixed regression