Study of Oviposition Pattern and Clutch Traits in a White Leghorn (WL) Layer Population

Roy, Barnali; Kataria, M. C.; Roy, Utpal Singha

doi:10.9790/2380-07115967

Cited by 9 publications

(11 citation statements)

References 21 publications

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“…There was however a reduction in CS and corresponding increase in LP at older age consistent with reports of previous studies in WL and RIR breeds ( Wolc et al., 2019 ). However, CS for early and late periods of lay larger than observed in our study was documented ( Roy et al., 2014 ; Wolc et al., 2019 ). Egg number reported for WL pure lines in other studies is comparable to those observed in the current study ( Liu et al., 2011 ; Khawaja et al., 2013a ).…”

Section: Discussioncontrasting

confidence: 62%

Hybrids generated by crossing elite laying chickens exhibited heterosis for clutch and egg quality traits

et al. 2020

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Crossbreeding advantage in hybrids compared with their parents, termed heterosis, has been exhaustively exploited in chicken breeding over the last century. Reports for crossbreeding of elite laying chickens covering rearing and laying period remain infrequent. In this study, resource populations of Rhode Island Red ( RIR ) and White Leghorn ( WL ) pure-bred chickens were reciprocally crossed to generate 4 distinct groups that were evaluated for prelaying growth, egg production, and egg quality. Birds monitored for prelaying growth consists of 105 (RIR), 131 (WL), 207 (RIR × WL) and 229 (WL × RIR), and 30 pullets from each group were evaluated. Egg laying records were collected from 102, 89, 147, and 191 hens in the 4 populations, respectively. In addition, expression of 5 candidate genes for egg production in the ovarian follicles was measured by RT-qPCR. Results showed that BW of hatched chicks in the WL line was higher than the other populations. However, the 2 crossbreds grew faster than WL purebred throughout the prelaying period. Low to medium heterosis was observed for BW and body length before the onset of lay. White Leghorn and the hybrids commenced laying earlier than RIR pullets and egg production traits were favorable in the crossbreds compared with purebreds. Heterosis for egg number and clutch size was moderate in WL × RIR but low in RIR × WL hens. Expression of antimullerian hormone gene was high in WL and RIR × WL hybrids, suggesting WL parent-specific enhancing dominant expression. Shell weight was higher in the crossbreds than purebreds at 52 wk of age, but RIR hens laid eggs with higher shell ratio than the other populations ( P < 0.05). Conversely, WL and the hybrids had higher eggshell strength than RIR birds ( P < 0.05). Eggshell strength was the only egg quality trait that showed heterosis above 10% in WL × RIR hybrids at 32 and 52 wk of age. White Leghorn × RIR hens demonstrated higher percent heterosis for economic traits than birds of the reciprocal hybrid. This means that RIR breed is a better dam than a sire line for growth, egg laying, and egg quality traits.

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Section: Discussioncontrasting

confidence: 62%

Hybrids generated by crossing elite laying chickens exhibited heterosis for clutch and egg quality traits

et al. 2020

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“…Lillpers and Wilhelmson (1993) and Luc et al (1996) published detailed analyses of both the biology and the cycle of egg formation. These developments stimulated research on the possibility of crossing the biological limit of one egg per 24-26 h. One of the newer traits that were a focus of research was oviposition time (Noddegaard, 1998;Lewis et al, 1995Lewis et al, , 2004Roy et al, 2014). Experiments were performed with extending or shortening hours with light (Biellier, 1985;Koelkebeck and Biellier, 1986).…”

Section: Measurements Of Egg Production: Oviposition Timementioning

confidence: 99%

Genetics and genomics of egg production traits in poultry species

Wolc¹,

Arango²,

Fulton³

2020

Burleigh Dodds Series in Agricultural Science

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Introduction 2 Measurements of egg production: partial and total egg production 3 Measurements of egg production: oviposition time 4 Measurements of egg production: clutch traits 5 Measurements of egg production: egg production curves 6 Biological traits related to egg production 7 Studies of genetics and genomics of egg production in broilers 8 Studies of egg production in quail 9 Studies of egg production in turkeys 10 Studies of egg production in waterfowl 11 Conclusion 12 Future trends 13 Where to look for further information 14 References 14 References

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“…Oviposition is a complex process where oviposition time (OT), clutch length (CL), and interval length (IL) are interrelated (B.G. Roy et al, 2014). The review presented highlights the effects of lighting regimes on the oviposition time in laying hens (Gallus gallus domsticus L.) in the relation with egg productivity and quality.…”

Section: Introductionmentioning

confidence: 99%

“…Яйцекладка -сложный процесс, в котором время яйцекладки (ВЯ, среднее по стаду время суток, когда куры сносят яйца), цикл яйцекладки (ЦЯ, период, в течение которого птицы сносят яйца ежедневно) и интер-вал яйцекладки (ИЯ, период между двумя последовательными циклами яйцекладки) взаимосвязаны (18). Известно, что время яйцекладки зависит от генотипа, системы содержания, возраста (18), времени кормления птицы (19,20), режима освещения (21), температуры в птичнике (22). Как свидетельствуют данные литературы, наиболее существенное влияние на время снесения яиц у кур оказывает освещение.…”

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“…Roy с соавт. (18), которые сообщают, что при режиме 16С:8Т (фотопериод с 6 00 до 22 00 ) среднее время яйцекладки составило  10 59 , то есть оно наступало спустя 5 ч после включения света (или через 13 ч после наступления темнового периода).…”

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THE EFFECTS OF LIGHTING REGIMES ON THE OVIPOSITION TIME AND EGG QUALITY IN LAYING HENS (review)

Kavtarashvili¹,

Фисинин²,

Buyarov³

et al. 2019

S-h. biol.

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Яйцекладка-сложный процесс, в котором время яйцекладки (ВЯ), цикл яйцекладки (ЦЯ) и интервал яйцекладки (ИЯ) взаимообусловлены (B.G. Roy с соавт. 2014). Настоящий обзор посвящен оценке влияния освещения на время яйцекладки и его связи с показателями качества яиц и продуктивностью кур (Gallus gallus domsticus L.). ВЯ напрямую сопряжено со временем овуляции, которое, в свою очередь, зависит от времени пикового выброса лютеинизирующего гормона в кровь передним отделом гипофиза (S.C. Wilson с соавт., 1984). В стандартных 24-часовых свето-темновых циклах при однократном чередовании света и темноты яйцекладка происходит в основном за световой период (F. Noddegaard, 1998; Г.А. Кирдяшкина с соавт. 2009), а при режимах прерывистого освещения ассиметричного типа-в течение «субъективного дня» (

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Study of Oviposition Pattern and Clutch Traits in a White Leghorn (WL) Layer Population

Cited by 9 publications

References 21 publications

Hybrids generated by crossing elite laying chickens exhibited heterosis for clutch and egg quality traits

Hybrids generated by crossing elite laying chickens exhibited heterosis for clutch and egg quality traits

Genetics and genomics of egg production traits in poultry species

THE EFFECTS OF LIGHTING REGIMES ON THE OVIPOSITION TIME AND EGG QUALITY IN LAYING HENS (review)

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