Relationship between Intersequence Pauses, Laying Persistency and Concentration of Prolactin during the Productive Period in White Leghorn Hens

Reddy, I. J.; David, C. G.; Singh, Kiranjeet

doi:10.5713/ajas.2005.686

Cited by 10 publications

(7 citation statements)

References 37 publications

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“…Clutch size ( CS ), the number of eggs laid on successive days by a hen, was calculated as the total number of eggs laid within a period divided by the number of sequences recorded ( Blake and Ringer 1987 ). The length of pause ( LP ) was determined following Reddy et al. (2005) and was calculated by dividing total number of pause days with number of pauses recorded within a period for each hen.…”

Section: Methodsmentioning

confidence: 99%

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: Methodsmentioning

confidence: 99%

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

et al. 2020

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“…This may explain the cause for longer sequences and reduced laying pauses in the treated birds. However, the occurrence of more than 8 days (more than 11 days by Reddy et al, 2005; more than 8 days by Reddy et al, 2006) of laying pauses in birds of both groups may be due to the genetic constitution of individual birds. In the present study the treatment with bromocriptine through oral feeding, during laying was able to control egg production in indigenous hens.…”

Section: Laying Pausesmentioning

confidence: 99%

Effect of anti-prolactin drug and peppermint on broodiness, laying performance and egg quality in indigenous hens

Banu

Rashid

Hasan

et al. 2017

Asian J. Med. Biol. Res

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Abstract:The study was conducted to determine the effect of antiprolactin drug (Bromergon®) and Peppermint (Mentha piperita L.) on broodiness, laying performance and egg quality in indigenous hens. The effect of modulation of prolactin concentration on egg production, sequence length and inter sequence pauses were studied by analyzing the oviposition records. Total sixty indigenous laying hens (30-40 weeks of age), were assigned for treatment with peppermint solution and Bromergon®. Sixty laying hens were randomly divided into 4 groups (A, B, C and D) and each group remained 15 hens. Group A was kept for control, Group B was treated with bromocriptine (Bromergon® SANDOZ) orally @ 640 μg per bird per day, Group C with 50% peppermint solution @ 10 g per bird orally and Group D was with peppermint and Bromergon® combined at previous dose. Over the course of trial, incremental dietary peppermint (Group C) significantly (p˃0.05) increased egg production, body weight of treated indigenous hens than other groups. Egg shell percentage, thickness and haugh unit of hens fed diets supplemented with peppermint were greater than that of hens fed the control diet. However, peppermint supplementation did not influence other egg quality characteristics like albumen and yolk percentages and albumen height. The treated birds had comparatively longer sequences and fewer pauses. It is concluded that the physiological pauses occur during ovulatory sequences can be disrupted effectively using Bromergon® and peppermint. Prolactin levels modulated which may interfere with follicular recruitment and subsequent oviposition thereby improves egg laying potential of the indigenous hens.

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“…The PLR and PRLR genes are expressed in many tissues including the hypothalamus, ovary and oviduct [56,57], and mediate the formation of egg quality [58]. PRL is generally considered to be a key factor in the onset and maintenance of broody behaviour in birds, and it has been well established that the elevated plasma PRL inhibits gonadotropin release, ovum development and ovulation, resulting poor laying performance and even complete cessation of egg production in laying hens [59][60][61][62]. Transcriptome studies have also revealed PRL is associated with egg production performance in chicken hypothalamic-pituitary-ovarian axis [63,64].…”

Section: Discussionmentioning

confidence: 99%

Cuticle Secretion Duration in the Uterus Is One of the Major Factors Affecting Eggshell Cuticle Deposition in White Leghorn Laying Hens

Chen

et al. 2020

Preprint

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Background: The cuticle formed in the uterus is the outermost layer as the first defense line of eggshell against microbial invasions in most avian species, and analyzing its genetic regulation and influencing factors are of great importance to egg biosecurity in poultry production. The current study compared the uterine transcriptome and proteome of laying hens producing eggs with good and poor cuticle deposition (GC and PC, the top and tail of the cuticle deposition distribution), and identified several genes involved with eggshell cuticle deposition.Results: Overall, transcriptomic analysis identified 53 differentially expressed genes (DEGs) between PC vs GC group hens, among which 25 were up-regulated and 28 were down-regulated. No differences were found in the uterine proteome. Several up-regulated DEGs of PC vs GC hen uterus, including PTGDS, PLCG2, ADM and PRLR related to uterine functions and reproductive hormones, were validated by qPCR analysis. Phenotypic measurements for verification between GC and PC hens showed GC hens had longer laying interval between two consecutive ovipositions (25.64 ± 1.23 vs 24.94 ± 1.12 h), thicker eggshell thickness (352.01 ± 23.04 vs 316.20 ± 30.58 μm) and more laying days (20.67 ± 2.58 vs 18.48 ± 2.46) within 27 laying days (P < 0.05). Apart from eggshell traits, other egg quality traits didn’t differ. The results above suggested that the expression patterns of PTGDS, PLCG2, ADM and PRLR genes in the uterus regulated the muscular activity rhythm and secretion function, which ensured the eggshell and cuticle formation duration, and lead to the good eggshell and cuticle quality of the GC hens.Conclusions: The present study demonstrated eggshell and cuticle secretion duration in the uterus is one of the major factors affecting eggshell cuticle deposition in laying hens. PTGDS, PLCG2, ADM and PRLR genes were discovered and might play crucial roles in cuticle deposition by regulating the uterine muscular activities and secretion function. Moreover, the cuticle is associated with the eggshell quality and laying performance, implying the importance of selection to the cuticle trait in laying hens. The findings in present study provide new insights into the genetic regulation of cuticle deposition in laying hens and establish a foundation for further investigations.

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Relationship between Intersequence Pauses, Laying Persistency and Concentration of Prolactin during the Productive Period in White Leghorn Hens

Cited by 10 publications

References 37 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

Effect of anti-prolactin drug and peppermint on broodiness, laying performance and egg quality in indigenous hens

Cuticle Secretion Duration in the Uterus Is One of the Major Factors Affecting Eggshell Cuticle Deposition in White Leghorn Laying Hens

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