Pooled parameter estimates for traits of economic importance in indigenous chicken in the tropics

Ndung’u, Catherine Wanjiru; Okeno, T.O.; Muasya, T. K.

doi:10.1016/j.livsci.2020.104102

Cited by 8 publications

(3 citation statements)

References 37 publications

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“…The low heritability value recoded for egg weight loss means that the external factors surrounded by settable eggs must be taken into consideration during incubation. However, the heritability estimates of chick weight at hatch are widely varied in indigenous chickens in the tropics, resulting from the method of estimation, location at which the data was collected ( Ndung'u et al, 2020 ), or due to the small sample size used for each genotype ( Singh et al, 2009 ). An insubstantial overestimation of heritability may be obtained for hatchability traits resulting from a small sire effect.…”

Section: Discussionmentioning

confidence: 99%

Effect of genotype and egg weight on hatchability properties and embryonic mortality pattern of native chicken populations

Fathi¹,

Abou-Emera²,

Al-Homidan³

et al. 2022

Poultry Science

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Section: Discussionmentioning

confidence: 99%

Effect of genotype and egg weight on hatchability properties and embryonic mortality pattern of native chicken populations

Fathi¹,

Abou-Emera²,

Al-Homidan³

et al. 2022

Poultry Science

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“…Due to several challenges such as poor data recording, small data size, and small populations in developing countries, however, it may be di cult to generate genetic and phenotypic parameters from the same population [78]. The current study, therefore, used the consensus genetic and phenotypic parameters for IC generated from Meta-Analysis [57]. Since the correlation between the same trait may deviate from unity in different environments due to G x E [51], correlations between traits in the breeding objective in the current study were sourced from the literature [3,36] and subjected to Meta-Analysis and are presented in Table 1.…”

Section: Genetic Phenotypic Parameters and Genetic Correlationsmentioning

confidence: 99%

“…Correlated genetic gain achieved for EW was lower in the nucleus than in commercial in the two breeding schemes, contrarily to BW and EN. This difference could be caused by the negative phenotypic and genetic correlation between EW and EN [57]. This suggests that selection of IC for EN would compromise egg size.…”

Section: Rates Of Genetic Gain and Inbreeding Of Indigenous Chicken I...mentioning

confidence: 99%

Response to Selection of Indigenous Chicken in Rwanda Using Within-Breed Selection Strategy

Habimana,

Ngeno,

Okeno

2024

Preprint

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The study evaluated response to selection from within-breed selection strategy for conventional (CBS) and genomic (GBS) breeding schemes. These breeding schemes were evaluated in both high-health environments (nucleus) and smallholder farms (commercial). Breeding goal was to develop a dual-purpose IC for both eggs and meat through selective breeding. Breeding objectives were body weight (BW), egg weight (EW), egg number (EN) and resistance to Newcastle disease (AbR). A deterministic simulation was performed to evaluate rates of genetic gain and inbreeding. Base population in the nucleus was made up of 40 cockerels and 200 pullets. Selection pressure was 4% and 20% in the males and the females, respectively. The impact of nucleus size and selection pressure on rates of genetic gain and inbreeding of the breeding program was investigated through sensitivity analysis. SelAction software was used to predict rates of genetic gain and inbreeding. Results showed that using CBS in the nucleus, the breeding goal was 340.41$ and 1.13 times higher than that in the commercial flock. Inbreeding rate per generation of selected chicken in the nucleus was 1.45% and lower by 1.32 times compared to their offspring under smallholder farms. Genetic gains per generation in the nucleus for BW and EN traits were 141.10 g and 1.07 eggs and 1.12 and 1.10 times greater than those in smallholder farms, respectively. With GBS, the breeding goal was increased by 3.00 times whereas inbreeding rate was reduced by 3.15 times. Besides, using GBS, the selected birds in the nucleus were relatively similar to those in a commercial environment. Finally, the study revealed that the nucleus size and mating ratio influence the rates of genetic gain and inbreeding in both GBS and CBS. This study shows that IC in Rwanda have the potential to be improved through within-breed selection strategy using either CBS or GBS.

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Genetic and phenotypic parameter estimates for selection within Ugandan indigenous chickens

Beyihayo

Kugonza

Ndyomugyenyi

et al. 2023

Trop Anim Health Prod

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Pooled parameter estimates for traits of economic importance in indigenous chicken in the tropics

Cited by 8 publications

References 37 publications

Effect of genotype and egg weight on hatchability properties and embryonic mortality pattern of native chicken populations

Effect of genotype and egg weight on hatchability properties and embryonic mortality pattern of native chicken populations

Response to Selection of Indigenous Chicken in Rwanda Using Within-Breed Selection Strategy

Genetic and phenotypic parameter estimates for selection within Ugandan indigenous chickens

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