caa a22 4500 397567111 CHVBK 20180308164831.0 cr unu---uuuuu 161202e199610 xx s 000 0 eng 10.3382/ps.0751180 doi (NATIONALLICENCE)oxford-10.3382/ps.0751180 Direct and Correlated Responses to Long-Term Selection for Increased Body Weight and Egg Production in Turkeys [Elektronische Daten] [KARL E. NESTOR, D. O. NOBLE, J. ZHU, Y. MORITSU] Lines of turkeys were selected long-term for increased egg production (E line; 34 generations) or increased 16-wk BW (F line; 28 generations). The E and F lines were started from randombred control populations (RBC1 and RBC2, respectively) that were also maintained to remove environmental variation among generations. Realized heritabilities (h2) ± SE in the E line, based on regressions of response on cumulated actual selection differentials (selection differentials weighted for the number of offspring produced), for 180-d and 250-d egg production were 0.34 ± 0.02 (17 generations) and 0.26 ± 0.13 (8 generations), respectively. The realized h2 of 16-wk BW in the F line was 0.26 ± 0.01. There was no consistent evidence of selection response reaching a plateau in either line. The genetic association of BW and egg production changed with selection in the E and F lines. The genetic correlation varied from near zero to strongly negative and fluctuated between these extremes in both lines even though they started from different base populations and selection criteria differed. Other correlated responses to selection for increased egg production were increased average clutch length (intensity of lay), and decreased broodiness (total days lost), egg weight, shell coloration, and rate of response to stimulatory lighting. Other correlated responses to selection for increased 16-wk BW in the F line included: increased egg weight (due to increased albumen), longer eating bouts, and decreased average clutch length, semen production, walking ability, and resistance to Pasteurella multocida and Newcastle disease virus. Selection within the E and F lines also changed the frequency of MHC haplotypes and the changes appeared to be in opposite directions in the two lines. © 1996 Poultry Science Association, Inc. Breeding and Genetics nationallicence body weight nationallicence egg production nationallicence selection responses nationallicence correlated responses nationallicence turkey nationallicence NESTOR KARL E. aut NOBLE D. O. aut ZHU J. aut MORITSU Y. aut Poultry Science Oxford University Press 75/10(1996-10), 1180-1191 0032-5791 75:10<1180 1996 75 ps https://doi.org/10.3382/ps.0751180 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3382/ps.0751180 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- NESTOR KARL E. aut NATIONALLICENCE 700 1- NOBLE D. O. aut NATIONALLICENCE 700 1- ZHU J. aut NATIONALLICENCE 700 1- MORITSU Y. aut NATIONALLICENCE 773 0- Poultry Science Oxford University Press 75/10(1996-10), 1180-1191 0032-5791 75:10<1180 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