- Volume 32 Issue 9
DOI QR Code
Different penalty methods for assessing interval from first to successful insemination in Japanese Black heifers
- Setiaji, Asep (United Graduate School of Agricultural Sciences, Kagoshima University) ;
- Oikawa, Takuro (United Graduate School of Agricultural Sciences, Kagoshima University)
- Received : 2018.09.27
- Accepted : 2019.01.04
- Published : 2019.09.01
Objective: The objective of this study was to determine the best approach for handling missing records of first to successful insemination (FS) in Japanese Black heifers. Methods: Of a total of 2,367 records of heifers born between 2003 and 2015 used, 206 (8.7%) of open heifers were missing. Four penalty methods based on the number of inseminations were set as follows: C1, FS average according to the number of inseminations; C2, constant number of days, 359; C3, maximum number of FS days to each insemination; and C4, average of FS at the last insemination and FS of C2. C5 was generated by adding a constant number (21 d) to the highest number of FS days in each contemporary group. The bootstrap method was used to compare among the 5 methods in terms of bias, mean squared error (MSE) and coefficient of correlation between estimated breeding value (EBV) of non-censored data and censored data. Three percentages (5%, 10%, and 15%) were investigated using the random censoring scheme. The univariate animal model was used to conduct genetic analysis. Results: Heritability of FS in non-censored data was
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