Roles of age, body weight and composition in the initiation of sexual maturation of Japanese quail (<i>coturnix coturnix japonica</i>)

Oruwari, Boma; Brody, Tom

doi:10.1080/00071668808417074

Cited by 17 publications

(9 citation statements)

References 17 publications

(17 reference statements)

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“…Reaching sexual maturity is influenced by chronological age, body weight and body composition (Siegel & Dunnigton, 1985). On the other hand, the interaction between them for the onset of sexual maturity is inseparable (Oruwari & Brody, 1988, Reddish et al, 2003. Kerr et al, (2001) reported the effect of exponential growth rate and indications of critical period of development on age at first egg (between 14 and 42 days of age) in meat-type chickens.…”

Section: Resultsmentioning

confidence: 99%

Genetic association between sexual maturity and weekly live-weights in laying-type Japanese quail

Sezer

Berberoğlu²,

Ulutaş³

2006

SA J. An. Sci.

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This study focused on the estimation of genetic relationships between weekly live weights and sexual maturity of male and female Japanese quail. The live body weight data of a laying-type quail line over time were collected from hatching to six weeks of age. Sexual maturity was determined as the day of production of cloacal gland foam for males, and the day of laying the first egg for females. (Co)Variance components and genetic parameters were estimated, using MTDFREML, a restricted maximum likelihood (REML) procedure using a model with direct and maternal genetic effects. Heritability estimates of weekly live weights ranged from moderate to high (0.20 -0.60), and were higher for males than for females. The variance due to maternal effects disappeared gradually for males but rapidly for females as the chicks grew older. Heritability of age of sexual maturation was 0.24 ± 0.008 and 033 ± 0.136 for males and females, respectively. Genetic correlations between ages of reaching sexual maturity and live weights (except hatchling weight) were favourable for males (-0.16 to -0.45) and unfavourable for females (0.14 to 0.22). Genetic correlations between males and females ranged from moderate (0.46 ± 0.083) to high (0.98 ± 0.139) for weekly live weights, and were 0.71 ± 0.24 for age of reaching sexual maturity. Sexual size dimorphism can be explained by the differences in pattern of heritability and correlation estimates between reaching sexual maturity and live weights for males and females.

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Section: Resultsmentioning

confidence: 99%

Genetic association between sexual maturity and weekly live-weights in laying-type Japanese quail

Sezer

Berberoğlu²,

Ulutaş³

2006

SA J. An. Sci.

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“…In quail, sexual development is known to depend on the length of the daily light period [4,10,15,27,39]: long photoperiods, from 12L:12D onwards [10], stimulate sexual maturation, while short photoperiods inhibit [4,10,15,27] or delay sexual maturation [39], depending on how long birds were followed. In this study short photoperiods inhibited sexual maturation.…”

Section: Discussionmentioning

confidence: 99%

Effect of photoperiod on body weight gain, and daily energy intake and energy expenditure in Japanese quail (Coturnix c. Japonica)

Boon

2000

Physiology &Amp; Behavior

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“…Intensive genetic selection of layer hens for economically important production traits results in considerable differences in the mechanisms of growth and development (Buzała et al, 2015). Sexual maturity, defined as age at production of the first egg, is influenced by chronological age, body weight, and body composition (Oruwari & Brody, 1988). Also, LBL strain started lay 13 days earlier than Cairo L-2 when photo stimulated at the same age (Table 2).…”

Section: Resultsmentioning

confidence: 99%

“…Thus, selection to improve shell quality is an important selection goal to reduce egg breakage (Arango et al, 2016). In addition, there are many factors that affect quail sexual maturity in including age, body weight, and body composition (Oruwari & Brody, 1988). The objective of the present experiment was to study the effect of genetic selection, for egg production, on ovarian morphology at sexual maturity, egg production, and egg quality from sexual maturity until 36 weeks of age in commercial and selected local chickens strain.…”

Section: Ovarian Morphology and Egg Quality Traits Of Egyptian Selectmentioning

confidence: 99%

Ovarian Morphology and Egg Quality Traits of Egyptian Selected Strain for Egg Production Compared with Commercial Laying Strains

Nassar

El-Komy

Abdou

2017

Rev. Bras. Cienc. Avic.

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An experiment was conducted to evaluate the effect of selection for egg production performance of Cairo L-2 strain, as a local layer strain, after five generations of selection on productivity, ovarian morphology and some egg quality traits versus commercial Lohmann Brown-Lite (LBL) strain. The performance in the 5th generation was evaluated in Cairo L-2 and LBL strains for live body weight at sexual maturity (BWSM), age at sexual maturity (ASM), first egg weight (FEW), ovarian morphology, ovarian follicles number, ovarian weights and diameter, oviduct weight, liver weight, and stroma weight and their percentages to live body weight at sexual maturity for Cairo L-2 and LBL strains. Egg traits at 36 weeks of age including: egg number (EN), egg weight (EW), shell thickness (ST), and shell index (SI) were also obtained. Current results indicated that Cairo L-2 strain had higher ASM compared with LBL strain. Also, Cairo L-2 strain had lower BWSM, oviduct, ovary, stroma, and liver absolute weights and relative ovary weight compared with LBL strain. Ovarian follicles number, weights and diameter, FEW, and EN until 36 weeks of age were higher in LBL than in Cairo L-2 strain. Also, SI of the LBL was higher than that of Cairo L-2 strain. Moreover, Cairo L-2 strain egg production until 36 weeks of age was about 80% of that of LBL strain with good ST and SI. In conclusion, there were positive responses in ovarian morphology, egg production, and egg quality traits of Cairo L-2 strain associated with breeding program.

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Roles of age, body weight and composition in the initiation of sexual maturation of Japanese quail (coturnix coturnix japonica)

Cited by 17 publications

References 17 publications

Genetic association between sexual maturity and weekly live-weights in laying-type Japanese quail

Genetic association between sexual maturity and weekly live-weights in laying-type Japanese quail

Effect of photoperiod on body weight gain, and daily energy intake and energy expenditure in Japanese quail (Coturnix c. Japonica)

Ovarian Morphology and Egg Quality Traits of Egyptian Selected Strain for Egg Production Compared with Commercial Laying Strains

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