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Titolo:
Carcass traits, ovarian morphology and egg laying characteristics in earlyversus late maturing strains of commercial egg-type hens
Autore:
Robinson, FE; Renema, RA; Oosterhoff, HH; Zuidhof, MJ; Wilson, JL;
Indirizzi:
Univ Alberta, Dept Agr Food & Nutr Sci, Edmonton, AB T6G 2P5, Canada Univ Alberta Edmonton AB Canada T6G 2P5 Sci, Edmonton, AB T6G 2P5, Canada Alberta Agr Food & Rural Dev, Edmonton, AB T6H 5T6, Canada Alberta Agr Food & Rural Dev Edmonton AB Canada T6H 5T6 B T6H 5T6, Canada Univ Georgia, Dept Poultry Sci, Athens, GA 30602 USA Univ Georgia Athens GA USA 30602 , Dept Poultry Sci, Athens, GA 30602 USA
Titolo Testata:
POULTRY SCIENCE
fascicolo: 1, volume: 80, anno: 2001,
pagine: 37 - 46
SICI:
0032-5791(200101)80:1<37:CTOMAE>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
BROILER BREEDER HENS; BODY-WEIGHT; REPRODUCTIVE EFFICIENCY; FOLLICULAR HIERARCHY; SEXUAL MATURITY; FEED ALLOCATION; GALLUS-DOMESTICUS; FOOD RESTRICTION; GROWTH; AGE;
Keywords:
egg-type hens; sexual maturation; ovarian morphology; egg production; strain variation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Robinson, FE Univ Alberta, Dept Agr Food & Nutr Sci, Edmonton, AB T6G 2P5,Canada Univ Alberta Edmonton AB Canada T6G 2P5 , AB T6G 2P5, Canada
Citazione:
F.E. Robinson et al., "Carcass traits, ovarian morphology and egg laying characteristics in earlyversus late maturing strains of commercial egg-type hens", POULTRY SCI, 80(1), 2001, pp. 37-46

Abstract

Three hundred commercial Single Comb While Leghorn (SCWL) pullets of two strains differing in age at first oviposition (early maturing = EARLY; latermaturing = LATE) were reared and photostimulated at 18 wk. Selected birds of each strain were killed at weekly intervals from 17 to 23 wk, at sexual maturity, or at 68 wk of age for the study of carcass and reproductive organ traits. Egg production was recorded for surviving hens to 68 wk of age. The two strains differed in age at sexual maturity (EARLY, 137.5 d; LATE, 142.1 d). The EARLY strain birds appeared to allocate a greater proportion ofnutrients to reproductive development (oviduct) from 19 to 22 wk of age than did the LATE group, which showed greater breast muscle development during this same period. The LATE strain hens were significantly heavier than the EARLY hens at sexual maturity, and this difference in BW persisted to theend of the laying period. Although total egg production did not differ between strains, the LATE strain hens had a longer prime egg-laying sequence length (LATE, 70.2 d; EARLY, 52.6 d) as well as a longer mean sequence length (LATE, 12.8 d; EARLY, 8.7 d). Egg weight did not differ between strains. These data suggest that LATE lines of egg-type hens offer equivalent production efficiency due to improved rates of lay, albeit starting later.

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Documento generato il 05/12/20 alle ore 14:04:35