caa a22 4500 397567030 CHVBK 20180308164830.0 cr unu---uuuuu 161202e199601 xx s 000 0 eng 10.3382/ps.0750013 doi (NATIONALLICENCE)oxford-10.3382/ps.0750013 Effects of Sex-Linked Imperfect Albinism (sal-s) in the Chicken on the Relationships of Plasma Concentrations of Progesterone and 17β-Estradiol with Egg Production [Elektronische Daten] [H. SU, F. G. SILVERSIDES, P. VILLENEUVE, P. VILLENEUVE] Effects of the s al-s gene for sex-linked imperfect albinism on the relationships of plasma concentrations of progesterone (P4) and estradiol (E2) with egg production were investigated during the laying period. Egg production of 17 albino and 16 nonalbino hens was recorded from 19 to 60 wk of age. Blood samples of these hens were taken between 1330 and 1500 h at 19 and 20 wk of age and every 4 wk until 60 wk of age. At 61 wk, blood samples were taken 6, 5, and 4 h before a midsequence ovulation. Plasma P4 and E2 were measured by RIA. There was no difference between genotypes in days to first egg (157.8 vs 158.1 d). Hen-day egg production of al binos was greater (P < 0.05) than that of nonalbinos in the 4-wk periods between 52 and 56 wk (83.8 vs 69.2%) and 56 and 60 wk (81.3 vs 64.3%). Egg production for the entire laying cycle was not different between genotypes (81.0 vs 73.0%, P = 0.08). Plasma P4 and E2 concentrations were not different between albino and nonalbino hens. From 28 to 60 wk of age, partial correlation coefficients between P4 and egg production, and E2 and egg weight were significant for albino hens (r = 0.15 and 0.16, respectively) but not for nonalbinos (r = −0.03 and −0.1, respectively), and age and P4 concentrations were negatively correlated for both albinos (r = −0.22, P < 0.01) and nonalbinos (r = −0.32, P < 0.01). Preovulatory levels of P4 in albino hens were higher (P < 0.05) than those in nonalbinos. Plasma E2 was higher in albinos than in nonalbinos 5 h before ovulation (P < 0.05). These data suggest that increased egg production of albino hens is associated with differences in P4 and E2 metabolism. © 1996 Poultry Science Association, Inc. Breeding and Genetics nationallicence sal-s nationallicence sex-linked albino nationallicence progesterone nationallicence estradiol nationallicence egg production nationallicence SU H. aut SILVERSIDES F. G. aut VILLENEUVE P. aut VILLENEUVE P. Ministère de l'Agriculture, des Pêcheries et de l'Alimentation du Québec, Service de la zootechnie, 120-A Chemin du Roy, Deschambault, Québec, Canada, G0A 1S0 Poultry Science Oxford University Press 75/1(1996-01), 13-19 0032-5791 75:1<13 1996 75 ps https://doi.org/10.3382/ps.0750013 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3382/ps.0750013 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- SU H. aut NATIONALLICENCE 700 1- SILVERSIDES F. G. aut NATIONALLICENCE 700 1- VILLENEUVE P. aut NATIONALLICENCE 700 1- VILLENEUVE P. Ministère de l'Agriculture, des Pêcheries et de l'Alimentation du Québec, Service de la zootechnie, 120-A Chemin du Roy, Deschambault, Québec, Canada, G0A 1S0 NATIONALLICENCE 773 0- Poultry Science Oxford University Press 75/1(1996-01), 13-19 0032-5791 75:1<13 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