Production and quality of eggs from sex-linked imperfect albino (sal-s) and nonalbino (s+) hens kept under commercial conditions.
The beneficial effects of the gene for imperfect albinism on egg production were investigated under commercial conditions. In one line (Line 8) but not in another (Line 3), hen-day egg production of albinos from 46 to 75 wk of age was higher than that of nonalbinos (76.1 vs 72.6%) resulting in higher overall hen-day (71.1 vs 69.3%, P < .08) and hen-housed (276.3 vs 263.6 eggs) egg production by albino hens. Egg production of Line 8 albinos was not different than that of one of two commercial strains (Strain A) included as a control (76.1 vs 75.6%, P > .05). In data from Lines 3 and 8 combined, sexual maturity of albinos was delayed by 3.0 d. Mortality was higher for albinos than nonalbinos (3.6 vs 1.8%) during the first 2 wk of brooding and lower for albinos (5.8 vs 8.9%) during the laying period. Eggs from albinos weighed less (53.8 vs 55.3 g), had smaller yolks (16.9 vs 17.6 g) and shells (5.16 vs 5.27 g), and firmer albumen (5.9 vs 5.6 mm). The results suggest that the gene produces beneficial effects on egg production under commercial conditions.
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Département des Sciences Animales, Université Laval, Ste-Foy, Québec, Canada.
Silversides
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Villeneuve
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D000417:Albinism / Q000235:genetics / Q000662:veterinary*; D000818:Animals; D001835:Body Weight / Q000502:physiology; D001947:Breeding; D002645:Chickens / Q000235:genetics* / Q000502:physiology*; D004531:Eggs; D008040:Genetic Linkage; D008136:Longevity / Q000235:genetics; D011201:Poultry Diseases / Q000235:genetics / Q000503:physiopathology*; D012741:Sexual Maturation