caa a22 4500 397568630 CHVBK 20180308164835.0 cr unu---uuuuu 161202e199601 xx s 000 0 eng 10.3382/ps.0750020 doi (NATIONALLICENCE)oxford-10.3382/ps.0750020 Heterosis in Egg-Laying Lines Under Divergent Selection for Residual Feed Consumption [Elektronische Daten] [A. BORDAS, P. MÉRAT, F. MINVIELLE] Two lines selected since 1976 for high (R+) or low (R-) residual feed consumption (RFC) from a common genetic base were compared with one another and with their F1 reciprocal crosses for traits of egg production and quality, for morphological traits, body weights, and feed consumption. Heterosis was 11, -2.5, 8, and 2%, respectively, for egg number, age at first egg, egg laying rate, and egg weight, with marked differences between reciprocal crosses for all those traits but egg number. Heterosis for wattle length and shank length was 3.8 and 1.3%, respectively, essentially because R+ × R- crossbreds, with larger mean values, resembled the R+ line for those traits, which may therefore be associated with the presence of genes linked to the Z chromosomes. On the other hand, heterosis for RFC (-3.6%) originated from similar crossbred advantage in both reciprocal crosses, thereby suggesting that RFC is not determined by sex-linked genes. © 1996 Poultry Science Association, Inc. Breeding and Genetics nationallicence residual feed consumption nationallicence feed intake nationallicence egg production nationallicence morphological traits nationallicence heterosis nationallicence BORDAS A. aut MÉRAT P. aut MINVIELLE F. 1To whom correspondence should be addressed. aut Poultry Science Oxford University Press 75/1(1996-01), 20-24 0032-5791 75:1<20 1996 75 ps https://doi.org/10.3382/ps.0750020 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3382/ps.0750020 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- BORDAS A. aut NATIONALLICENCE 700 1- MÉRAT P. aut NATIONALLICENCE 700 1- MINVIELLE F. 1To whom correspondence should be addressed aut NATIONALLICENCE 773 0- Poultry Science Oxford University Press 75/1(1996-01), 20-24 0032-5791 75:1<20 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