Egg Production and Egg Composition of Parental Lines and F1 and F2 Crosses of White Rock Chickens Selected for 56-Day Body Weight

Anthony, Nicholas B.; Dunnington, E. A.; Siegel, P. B.

doi:10.3382/ps.0680027

Cited by 20 publications

(8 citation statements)

References 28 publications

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“…Also functional development of testes was more rapid than for ovaries, and females markedly exceeded males in adult BW. The growth and reproduction data from Japanese quail lines selected long term for high BW on optimal (P line) or suboptimal (T line) diet (Marks, 1978(Marks, , 1979 and chicken lines divergently selected for BW (Anthony et al, 1989(Anthony et al, , 1991 further support these findings.…”

Section: Onset Of Sexual Maturity and Growth Curvesupporting

confidence: 70%

Divergent selection for shape of growth curve in Japanese quail. 3. Onset of sexual maturity and basic characteristics of early lay

Hyánková¹,

Novotná

2007

British Poultry Science

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1. The onset of lay, quality of eggs during early lay and gonadal development of both sexes were analysed in meat-type lines of Japanese quail, HG and LG divergently selected for high and low relative weight gain between 11 and 28 d of age, respectively, and constant body weight (BW) at 49 d of age. 2. The LG line was sexually mature at an earlier age and lower BW than the HG line. This corresponded with the trend during embryonic and early postnatal development. 3. Analysis of gonads also confirmed earlier sexual development in the LG than in the HG line. In both lines, the growth of testes was detected about one week earlier than the growth of ovary. 4. Despite the different age and BW at onset of lay, HG and LG quail commenced lay at the same degree of maturity (about 90% of adult BW). This implied that the onset of sexual maturity could be identified as a point on the growth curve which terminates the linear phase. 5. When compared with the LG line, the HG line was characterised by a longer acceleration and shorter retardation phase of the growth curve. This difference is seen as an important determinant of line differences in growth and reproductive performance.

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Section: Onset Of Sexual Maturity and Growth Curvesupporting

confidence: 70%

Divergent selection for shape of growth curve in Japanese quail. 3. Onset of sexual maturity and basic characteristics of early lay

Hyánková¹,

Novotná

2007

British Poultry Science

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“…These were higher than mean egg weights for broiler breeds reported by some authors (LECLERQ et al, 1984;ANTHONY et al, 1988;HAGGER, 1993). The slightly higher mean egg weights obtained in this study may have resulted from selection for body weight since egg weight is known to be positively correlated with body size (HALE and CLAYTON, 1965;CLAYTON and ROBERTSON, 1966).…”

Section: Datacontrasting

confidence: 55%

“…The chicken in this study were slightly older at first egg than other meat-type chicken reported in the literature (LECLERCQ et al, 1984;ANTHONY et al, 1988).…”

Section: Datamentioning

confidence: 38%

Heritabilities and Genetic Correlations from a Selection Experiment in Broiler Breeders using Restricted Maximum Likelihood.

et al. 1995

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“…For example, selection for BW has altered the age at onset of lay (Dunnington et al, 1983), follicular development Zelenka et al, 1986), normal egg production (Marks, 1979; and composition (Anthony et al, 1989), carcass composition (Bacon and Nestor, 1983a,b), patterns of feed consumption (Barbato et al, 1980;Darden and Marks, 1989), and feed preference (Huey et al, 1982;Brody et al, 1984). These effects might influence a selection program by limiting the realized selection response.…”

Section: Introductionmentioning

confidence: 96%

Divergent Selection for Body Weight and Yolk Precursor in Coturnix coturnix japonica.

1990

Self Cite

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Correlated response data accompanying 19 generations of selection for increased (HW) or decreased (LW) 4-wk BW and increased (HP) or decreased (LP) total plasma P were summarized. Similarly, 11 generations of selection of sublines derived from the original Lines HW and LP were also analyzed. Sublines were maintained through selection of males for increased 4-wk BW and females for the respective high or low plasma P. The randombred control (RBC1) was stable for BW early in egg production, BW change from early to late in production, wet and dry liver weights, 120-day egg production, and ova weight. A linear decrease in BW was found for the RBC1 line late in egg production, egg and respective component weights, and ova number. Body weight early and late in the production period for original Lines HW and LW was different from the RBC1 line. Wet liver weight increased for the HW line while dry liver weights declined in the original Lines LW, HP, and LP. Egg weights were greater in Line HW and lower in Lines LW, HP, and LP than in the RBC1 line. Yolk weight increased in Line HW and decreased in Lines LW and LP. Albumen weight was reduced in Line LP while shell weight was increased in Line HW and decreased in Line HP. Egg production, from onset to 120 days, decreased in Lines HW and LW when compared to the RBC1 line. Line LP had more follicles in rapid development than Line RBC1. The sublines responded similarly to their line of origin differing only in the magnitude of response. This was a reflection of the mating scheme, which placed selection pressure on BW of males and plasma P in females.

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Egg Production and Egg Composition of Parental Lines and F1 and F2 Crosses of White Rock Chickens Selected for 56-Day Body Weight

Cited by 20 publications

References 28 publications

Divergent selection for shape of growth curve in Japanese quail. 3. Onset of sexual maturity and basic characteristics of early lay

Divergent selection for shape of growth curve in Japanese quail. 3. Onset of sexual maturity and basic characteristics of early lay

Heritabilities and Genetic Correlations from a Selection Experiment in Broiler Breeders using Restricted Maximum Likelihood.

Divergent Selection for Body Weight and Yolk Precursor in Coturnix coturnix japonica.

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