| dc.contributor.author | Hieber, Jordan | |
| dc.description.abstract | An experiment was conducted to quantify evaluator bias and determine the impacts bias may have on genetic evaluations. Three subjective evaluation methods were recorded (n = 806) at weaning, including docility score (DS; 1 to 6), temperament score (TS; 1 to 5), and qualitative behavior assessment (QBA; 12 attributes). Using Principal Component Analysis, a temperament index was calculated using QBA scores for each animal based on the first principal component as an additional temperament score. The final model utilized fixed effects of date of evaluation, sex, and evaluator (across only) in a traditional animal model to calculate estimated breeding value (EBV) and heritability for each temperament evaluation. Comparisons of EBV were based on correlation coefficients and quartile placements of animals within and across evaluators. Less than 30% of individuals had EBV that were 3 quartiles apart for all evaluation methods, indicating that evaluator interpretation has some impact on genetic evaluations. | en_US |
| dc.publisher | North Dakota State University | en_US |
| dc.rights | NDSU policy 190.6.2 | |
| dc.title | Temperament Evaluation in Beef Cattle: Understanding Evaluator Bias Within Subjective Measurements of Docility Score, Temperament Score, and Qualitative Behavior Assessment | en_US |
| dc.type | Thesis | en_US |
| dc.date.accessioned | 2018-05-22T15:50:44Z | |
| dc.date.available | 2018-05-22T15:50:44Z | |
| dc.date.issued | 2016 | en_US |
| dc.identifier.uri | https://hdl.handle.net/10365/28137 | |
| dc.description.sponsorship | North Dakota Agricultural Experiment Station | en_US |
| dc.rights.uri | https://www.ndsu.edu/fileadmin/policy/190.pdf | en_US |
| ndsu.degree | Master of Science (MS) | en_US |
| ndsu.college | Agriculture, Food Systems and Natural Resources | en_US |
| ndsu.department | Animal Sciences | en_US |
| ndsu.program | Animal Sciences | en_US |
| ndsu.advisor | Hanna, Lauren | |
