Sample size for the estimation of Pearson’s linear correlation in crotalaria species

Toebe, Marcos; Machado, Letícia Nunes; Tartaglia, Francieli de Lima; Carvalho, Juliana Oliveira de; Bandeira, Cirineu Tolfo; Filho, Alberto Cargnelutti

doi:10.1590/s1678-3921.pab2019.v54.01027

Cited by 5 publications

(5 citation statements)

References 16 publications

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“…The two variables might have a strong relationship, but the correlation coefficient could be close to zero [ 13 ]. The relationship between two variables depends on the species, pairing traits, and the magnitude of the correlation coefficient [ 30 ]. Positive associations between the BW and EP traits, and genotype, indicate an increase in BW and EP traits for each increase in the number of dominant alleles (G), while a negative relationship indicates that an increase in the number of dominant alleles (G) is not followed by an increase in AFE and FEW traits.…”

Section: Discussionmentioning

confidence: 99%

Prolactin gene polymorphisms and associations with reproductive traits in Indonesian local ducks

Purwantini

Santosa

et al. 2020

Vet World

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Background and Aim: Reproductive traits play an important role in population increases and the egg production (EP) abilities of Indonesian local ducks (ILD). The prolactin (PRL) gene is a single chain polypeptide hormone belonging to a family of growth hormone genes that are mainly synthesized in the anterior pituitary gland in all vertebrates. It has a significant effect on reproductive traits and EP. Single nucleotide polymorphisms (SNPs) present in PRL are a useful molecular marker for EP. This study aimed to identify the PRL polymorphisms based on these SNPs and to uncover the associations with reproductive traits in ILD. Materials and Methods: A total of 280 ILDs consisting of Tegal and Magelang (F0) ducks and their reciprocal crosses, namely, Gallang (F1) and Maggal (F1), were maintained and specific variables were recorded, that is, age at first egg, body weight at first egg, first egg weight, and EP, for 90 days. Allele and genotype frequencies were used to determine the Hardy- Weinberg (H-W) equilibrium. The association between the SNP genotypes of PRL and reproductive traits was analyzed using one-way analysis of variance, following the GLM procedure of SAS. The genotypic effects on the reproductive traits were determined using regression analysis. Results: This study successfully amplified a polymerase chain reaction product of 190 bp, which was used to identify the SNP. Results indicated that PRL in ILDs is polymorphic. A SNP was found at position 164 nt (c.164G >A), consisting of three different genotypes, namely, GG, GA, and AA. The genotypes of Tegal and Magelang (F0), and Gallang (F1) populations were not in H-W equilibrium. The Maggal population (F1) was in H-W equilibrium. Significant associations were detected between the genotypes and EP in all ILDs (p<0.01), following a regression line of y=2.337x+64.605, with a determination coefficient of 0.0188 (r=0.14). Conclusion: PRL can be recommended as a candidate gene for reproductive traits in ILD, especially EP.

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Section: Discussionmentioning

confidence: 99%

Prolactin gene polymorphisms and associations with reproductive traits in Indonesian local ducks

Purwantini

Santosa

et al. 2020

Vet World

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“…However, attention should be paid to the significance observed in high magnitude values, due to the small sample of the evaluated data. High magnitude correlation coefficients between traits are needed, when dealing with small samples, according to Sari et al (2017) and Toebe et al (2019). From a practical point of view, although the value of the linear correlation coefficient is not statistically significant, depending on the magnitude, it may have biological significance in the increase or decrease of the means of the traits.…”

Section: Resultsmentioning

confidence: 99%

Variability and genetic associations of pigeon pea yield traits in Mozambique

Pedro

Cruz

Donça

et al. 2022

Pesq. agropec. bras.

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The objective of this work was to evaluate the genetic variability and associations of yield traits of pigeon pea, for indication of this crop for the breeding program in Mozambique. Eleven pigeon pea traits were evaluated in a experimental design with three randomized complete blocks, in the environments of Namapa (I) and Montepuez (II), in 2017/2018. To evaluate the traits, analyses of variance, genetic parameters, correlations, correlation network, and path analysis were used. In both environments, there is a high genetic and phenotypic variability for primary branches, secondary branches, pods per plant, number of seed per pod, pod width, pod length, and yield, as well as a high heritability for all traits except for plant height. The primary and secondary branches have a high correlation with yield and a positive direct effect on it. However, plant height and pods per plant show a high phenotypic variability and a positive correlation with yield in environment I. Pods per plant, weight of 100 seed, and primary branches show high direct positive effects in environment I, and secondary branches and number of seed per pod, in environment II. The primary and secondary branches show high variability and associations with yield in both environments and are indicated for the pigeon pea breeding program in Mozambique.

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“…The two variables might have a strong relationship, but the correlation coefficient could be close to zero [13]. The relationship between two variables depends on the species, pairing traits, and the magnitude of the correlation coefficient [30]. Positive associations between the BW and EP traits, and genotype, indicate an increase in BW and EP traits for each increase in the number of dominant alleles (G), while a negative relationship indicates that an increase in the number of dominant alleles (G) is not followed by an increase in AFE and FEW traits.…”

Section: Prl Gene Associations With Reproductive Traitsmentioning

confidence: 99%

“…The FSH gene is reported to affect reproduction and production traits in ILDs [29]. In addition, reproduction and production traits in ducks are also affected by the type or species of livestock [30]. Some studies in Chinese local duck (Shaoxing) have reported that the melatonin receptor genes affect the age of first egg [33].…”

Section: Genotypic Effects Of the Prl Gene On Reproductive Traitsmentioning

confidence: 99%

November-2020

2020

Vet World

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Background and Aim: Reproductive traits play an important role in population increases and the egg production (EP) abilities of Indonesian local ducks (ILD). The prolactin (PRL) gene is a single chain polypeptide hormone belonging to a family of growth hormone genes that are mainly synthesized in the anterior pituitary gland in all vertebrates. It has a significant effect on reproductive traits and EP. Single nucleotide polymorphisms (SNPs) present in PRL are a useful molecular marker for EP. This study aimed to identify the PRL polymorphisms based on these SNPs and to uncover the associations with reproductive traits in ILD. Materials and Methods:A total of 280 ILDs consisting of Tegal and Magelang (F0) ducks and their reciprocal crosses, namely, Gallang (F1) and Maggal (F1), were maintained and specific variables were recorded, that is, age at first egg, body weight at first egg, first egg weight, and EP, for 90 days. Allele and genotype frequencies were used to determine the Hardy-Weinberg (H-W) equilibrium. The association between the SNP genotypes of PRL and reproductive traits was analyzed using one-way analysis of variance, following the GLM procedure of SAS. The genotypic effects on the reproductive traits were determined using regression analysis.Results: This study successfully amplified a polymerase chain reaction product of 190 bp, which was used to identify the SNP. Results indicated that PRL in ILDs is polymorphic. A SNP was found at position 164 nt (c.164G >A), consisting of three different genotypes, namely, GG, GA, and AA. The genotypes of Tegal and Magelang (F0), and Gallang (F1) populations were not in H-W equilibrium. The Maggal population (F1) was in H-W equilibrium. Significant associations were detected between the genotypes and EP in all ILDs (p<0.01), following a regression line of y=2.337x+64.605, with a determination coefficient of 0.0188 (r=0.14). Conclusion:PRL can be recommended as a candidate gene for reproductive traits in ILD, especially EP.

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Sample size for the estimation of Pearson’s linear correlation in crotalaria species

Cited by 5 publications

References 16 publications

Prolactin gene polymorphisms and associations with reproductive traits in Indonesian local ducks

Prolactin gene polymorphisms and associations with reproductive traits in Indonesian local ducks

Variability and genetic associations of pigeon pea yield traits in Mozambique

November-2020

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