Comb: An important reliable visual ornamental trait for selection in chickens

Mukhtar, Nasir; Khan, S. H.

doi:10.1017/s0043933912000542

Cited by 28 publications

(29 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Association analyses showed that rs315156783 was strongly associated with comb height at 84 days and comb height at 91 days (p < 0.05) but was not significantly associated with body weight at 77 days, body weight at 84 days, body weight at 91 days, comb height at 77 days, amount of eggs at 300 days, age at first egg, or weight of first egg (p > 0.05; Table 4). The mass of the comb is an important reproductive trait [23,24]. These results indicate that HEP21 is a candidate gene related to chicken sexual maturity.…”

Section: Associations Between Snps In Hep21 and Reproductive Traits Imentioning

confidence: 81%

Gene Expression Profiling in Ovaries and Association Analyses Reveal HEP21 as a Candidate Gene for Sexual Maturity in Chickens

Chen

Liang

Zhu

et al. 2020

Animals

View full text Add to dashboard Cite

The age of onset of sexual maturity is an important reproductive trait in chickens. In this study, we explored candidate genes associated with sexual maturity and ovary development in chickens. We performed DGE RNA-sequencing analyses of ovaries of pre-laying (P-F-O1, L-F-O1) and laying (P-F-O2, L-F-O2) hens of two sub-breeds of Ningdu Yellow chicken. A total of 3197 genes were identified in the two comparisons, and 966 and 1860 genes were detected exclusively in comparisons of P-F-O1 vs. P-F-O2 and L-F-O1 vs. L-F-O2, respectively. Gene ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analyses showed that genes involved in transmembrane signaling receptor activity, cell adhesion, developmental processes, the neuroactive ligand–receptor interaction pathway, and the calcium signaling pathway were enriched in both comparisons. Genes on these pathways, including growth hormone (GH), integrin subunit beta 3 (ITGB3), thyroid stimulating hormone subunit beta (TSHB), prolactin (PRL), and transforming growth factor beta 3 (TGFB3), play indispensable roles in sexual maturity. As a gene unique to poultry, hen egg protein 21 kDa (HEP21) was chosen as the candidate gene. Differential expression and association analyses were performed. RNA-seq data and qPCR showed that HEP21 was significantly differentially expressed in pre-pubertal and pubertal ovaries. A total of 23 variations were detected in HEP21. Association analyses of single nucleotide polymorphisms (SNPs) in HEP21 and reproductive traits showed that rs315156783 was significantly related to comb height at 84 and 91 days. These results indicate that HEP21 is a candidate gene for sexual maturity in chickens. Our results contribute to a more comprehensive understanding of sexual maturity and reproduction in chickens.

show abstract

Section: Associations Between Snps In Hep21 and Reproductive Traits Imentioning

confidence: 81%

Gene Expression Profiling in Ovaries and Association Analyses Reveal HEP21 as a Candidate Gene for Sexual Maturity in Chickens

Chen

Liang

Zhu

et al. 2020

Animals

View full text Add to dashboard Cite

show abstract

“…It is important to know when sexual maturation occurs in poultry management, the comb provides reliable clues on the selection of reproductive physiology. Most studies reported on the comb are associated with sexual maturity [ 1 ]. Also, the comb has been reported to affect male social rank, mate choice, heat regulation [ 2 ], and is related to female egg production, fecundity, bone mass [ 3 , 4 ], and also tarsus length [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Genome-Wide Association Studies for Comb Traits in Chickens

Shen

et al. 2016

PLoS ONE

View full text Add to dashboard Cite

The comb, as a secondary sexual character, is an important trait in chicken. Indicators of comb length (CL), comb height (CH), and comb weight (CW) are often selected in production. DNA-based marker-assisted selection could help chicken breeders to accelerate genetic improvement for comb or related economic characters by early selection. Although a number of quantitative trait loci (QTL) and candidate genes have been identified with advances in molecular genetics, candidate genes underlying comb traits are limited. The aim of the study was to use genome-wide association (GWA) studies by 600 K Affymetrix chicken SNP arrays to detect genes that are related to comb, using an F2 resource population. For all comb characters, comb exhibited high SNP-based heritability estimates (0.61–0.69). Chromosome 1 explained 20.80% genetic variance, while chromosome 4 explained 6.89%. Independent univariate genome-wide screens for each character identified 127, 197, and 268 novel significant SNPs with CL, CH, and CW, respectively. Three candidate genes, VPS36, AR, and WNT11B, were determined to have a plausible function in all comb characters. These genes are important to the initiation of follicle development, gonadal growth, and dermal development, respectively. The current study provides the first GWA analysis for comb traits. Identification of the genetic basis as well as promising candidate genes will help us understand the underlying genetic architecture of comb development and has practical significance in breeding programs for the selection of comb as an index for sexual maturity or reproduction.

show abstract

“…As indicated above, the color of the comb appears to be affected by LED light. The comb is an ornamental organ in chicks which can be used as an indicator of health [32], cell-mediated immunity [33] and also an indicator of health status disease resistance and nutritional status in the flock [34]. The findings showed that ICD chicks have redder combs than the LED chicks.…”

Section: Discussionmentioning

confidence: 98%

The Effect of Light-Emitting Diode Light on the Physical Traits of Chicks

Alattar¹,

Elwasife²,

Radwan³

2019

OJAS

View full text Add to dashboard Cite

Environmental conditions including light are considered a critical element of chicks well-being. The aim of the present study was to investigate the effect of LED light on the physical traits of chicks. We took forty-one-day-old chicks and randomly separated it into two groups. The chicks in the first group were reared under the effect of incandescent lamp light and in the second one were under the effect of white LED lighting. Chicks were daily monitored for individual chick body, weight gain, feed intake, feather color and fear responses. The distance between chicks and source of light was 50 cm. Student's t-test test was used for statistical evaluation at p < 0.05 level. The results of the current study showed that chicks reared under incandescent light bulb had significantly higher body weight compared with chicks reared under LED light. The magnitude of body weight in LED group was lower (1192.75 ± 149.9 g) compared to incandescent light group (1307.75 ± 110.5 g). The obtained results revealed that LED light reared chicks were more active; it showed long mobility duration and high levels of exploration in the farm as compared to those in incandescent light group. The results also indicated that incandescent light chicks were less fearful than LED chicks. Furthermore, the study showed that LED light reared chicks have pale pink combs and white feathers that cover all over the body. On the other hand, incandescent light reared chicks have dark red combs and whitish-yellow feathers that cover certain areas of the body especially chick wings, tail and head.

show abstract

Comb: An important reliable visual ornamental trait for selection in chickens

Cited by 28 publications

References 58 publications

Gene Expression Profiling in Ovaries and Association Analyses Reveal HEP21 as a Candidate Gene for Sexual Maturity in Chickens

Gene Expression Profiling in Ovaries and Association Analyses Reveal HEP21 as a Candidate Gene for Sexual Maturity in Chickens

Genome-Wide Association Studies for Comb Traits in Chickens

The Effect of Light-Emitting Diode Light on the Physical Traits of Chicks

Contact Info

Product

Resources

About