caa a22 4500 397566891 CHVBK 20180308164830.0 cr unu---uuuuu 161202e199608 xx s 000 0 eng 10.3382/ps.0750959 doi (NATIONALLICENCE)oxford-10.3382/ps.0750959 Estimates of Heritabilities and Genetic Correlations Between Tibial Dyschondroplasia Expression and Body Weight at Two Ages in Broilers [Elektronische Daten] [D. L. KUHLERS, G. R. MCDANIEL] Genetic variances and covariances were estimated by multiple-trait, derivative-free restricted maximum likelihood (DFREML) using an animal model for tibial dyschondroplasia (TD) expression and body weight at 4 and 7 wk of age. Data were collected from 7,483 broiler progeny obtained from 421 sires and 977 dams as part of a seven-generation selection experiment for high, and low TD expression, along with a randomly selected control line. Heritability estimates for TD expression and body weight at 7 wk were 0.42 and 0.50, respectively, larger than the corresponding estimates of 0.37 and 0.42 at 4 wk of age. Genetic correlations of TD expression or body weight at 4 wk with the same trait at 7 wk were greater than 0.80. Corresponding phenotypic correlations were 0.54 and 0.75 for TD incidence and body weight, respectively. Genetic correlations, however, of TD expression at either age with body weight at either age ranged from −0.01 to 0.10. Phenotypic correlations between the TD and body weight traits were of similar magnitude. TD expression and body weight at 4 and 7 wk of age, based on these data, are genetically and phenotypically independent traits. © 1996 Poultry Science Association, Inc. Breeding and Genetics nationallicence tibial dyschondroplasia nationallicence body weight nationallicence heritability nationallicence genetic correlations nationallicence broiler nationallicence KUHLERS D. L. Departments of Animal and Dairy, and aut MCDANIEL G. R. Poultry Sciences, Auburn University, Alabama 36849 aut Poultry Science Oxford University Press 75/8(1996-08), 959-961 0032-5791 75:8<959 1996 75 ps https://doi.org/10.3382/ps.0750959 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3382/ps.0750959 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- KUHLERS D. L. Departments of Animal and Dairy, and aut NATIONALLICENCE 700 1- MCDANIEL G. R. Poultry Sciences, Auburn University, Alabama 36849 aut NATIONALLICENCE 773 0- Poultry Science Oxford University Press 75/8(1996-08), 959-961 0032-5791 75:8<959 1996 75 ps Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford