Variations in growth patterns and conformation of snails: influence of strain and location on isometry of growth in cross river state of Nigeria

Okon, B.; Ibom, L. A.; Etuk, N.E; Akpan, E.W

doi:10.4314/joafss.v6i2.60298

Cited by 7 publications

(9 citation statements)

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“…This confirms the findings of Ojating (2001), Ojating and Ogar (2002), Okon et al (2008) and Okon and Ibom (2012) that the excessive and indiscriminate gathering of GALS from the wild, couple with deforestation, bush burning have led to depletion of GALS population, thus subjecting the genetic diversity of the snail to threat of extinction. The low genetic variability or high genetic similarity could also be as a result of high rate of selffertilization in these snails (Charlesworth et al, 1993;Worth et al, 1997).…”

Section: Generation Of Rapd Pattern Of Genomic Dnasupporting

confidence: 78%

“…This will to a great extent reduce the problem of animal protein inadequacy, as the per capita protein consumption of an average Nigerian is still low (World Bank, 2001). However, several workers (Ojating, 2001;Ojating and Ogar, 2002;Okon et al, 2008;Okon et al, 2009) have reported a drastic depletion of populations of GALS owing to excessive and indiscriminate gathering of snails (both juvenile and adult) from the wild; coupled with deforestation, bush burning and other human activities. Consequently, the genetic diversity of GALS (A. marginata) is gradually eroding thus threatened with extinction.…”

Section: Introductionmentioning

confidence: 99%

“…Archachatina marginata is one of the species of African land snails known as Giant African land snails (GALS) (Akinnusi, 2002;2004;Okon et al, 2008;Okon and Ibom, 2012). It belongs to the phylum Mollusca and the class gastropoda, it could be black-or white-skinned (Ejidike, 2002;Akinnusi, 2002Akinnusi, , 2004Okon et al, 2008;Okon and Ibom, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…It belongs to the phylum Mollusca and the class gastropoda, it could be black-or white-skinned (Ejidike, 2002;Akinnusi, 2002Akinnusi, , 2004Okon et al, 2008;Okon and Ibom, 2012). The snail is popular and highly appreciated as a valuable source of animal protein in many countries of Africa and beyond (Akinnusi, 2002(Akinnusi, , 2004Okon and Ibom, 2012).…”

Section: Introductionmentioning

confidence: 99%

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Genetic differentiation between the black skinned and white skinned snails (Archachatina marginata) using random amplified polymorphic DNAs

Okon¹,

Ibom²,

Njume³

2013

Afr. J. Biotechnol.

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The study investigates the genetic differentiation between the black skinned and white skinned ectotypes of the giant African land snails (Archachatina marginata) from Cross River State in Niger Delta region of Nigeria. The random amplified polymorphic DNA (RAPD) technique was employed in this study. Five (5) oligonucleotide primers (OPAD-09, OPAE-04, OPAE-05, OPAF-07 and OPAF-09) were used to amplify DNA from five samples of A. marginata constituting black skinned and white skinned ectotypes. A total of 58 RAPD bands with 24 polymorphic bands (40.18%) with size range of 150 to 5,500 bp, were scored from the populations. The black skinned ectotype had mean percentage polymorphism of 34.50%, while the white skinned ectotype recorded mean percentage polymorphism of 41.40%. Genetic similarity coefficient ranged from 60 to 63%, while the genetic distance ranged from 0.37 to 0.40. The genetic similarity between the two ectotypes of A. marginata from Cross River State is high and depicted low genetic differences. This reveals that the genetic variability of the species (A. marginata) from Cross River State is gradually eroding. Efforts should be made to conserve the genetic pool of this species, as the erosion of genetic variability is dangerous and could continue unnoticed till extinction is imminent.

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Section: Generation Of Rapd Pattern Of Genomic Dnasupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Genetic differentiation between the black skinned and white skinned snails (Archachatina marginata) using random amplified polymorphic DNAs

Okon¹,

Ibom²,

Njume³

2013

Afr. J. Biotechnol.

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“…The differences in correlation values here could be as a result of variations in the breed and strains of snails used, mating pattern, age and size of snails used as well as other environmental factors. Besides, Okon et al (2008) pointed out that medium sized and extra large sized snails (77.38 ± 2.08 -167.23 ± 3.50g) were collected at central agro-ecological zone and Obubra happens to fall under this ecological zone confirming the effect of age and size on morphometric traits.…”

Section: Resultsmentioning

confidence: 84%

Phenotypic Correlations and Body Weights Prediction Using Morphometric Traits of Snails in Calabar, Nigeria

Okon¹,

Ibom²

2011

Ethiop. J. Env Stud & Manag

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Data on hatchling body weights and morphometric traits (hatchling body shell length and hatchling body shell width) pertaining to two breeds of snails (A. marginata and A. achatina) from hatch to fourth (4 th ) week of age were analyzed. This was used to obtain correlation coefficient of morphometric traits and to generate prediction equations for live body weight of the animals. Strong, positive and significant correlations between hatchling body weight and body shell width (r=0.82) and between hatchling body weight and body shell length (r=0.80) for A. marginata as well as between hatchling body weight and body shell length (r=0.81) and between hatchling body weight and body shell width (r=0.86) for A. achatina were obtained. Low coefficients of determination (R 2 ) were obtained with the range from 4.73% to 41.30% and from 2.12% to 50.20% for A. marginata and A. achatina respectively. Morphometric traits (Hatchling body shell length and body shell width) best predicted hatchling body weights of A. achatina and not of A. marginata snails. Strong, positive and significant correlations imply that selection for these morphometric traits will lead to improvement of hatchling body weights.

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Comparison of growth and heterosis of body parameters of two varieties of snail [Archachatina marginata (Swainson1821)] and their crosses reared under tropical conditions

Okon¹,

Ibom²,

Sam³

et al. 2017

J. Anim. Sci. Vet. Med.

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The main objective of this paper was to compare growth traits and heterosis of body parameters of two varieties of Archachatina marginata (var. ovum and var. saturalis) and their crosses under experimental conditions. Three hundred (300) juvenile snails (Archachatina marginata), one hundred (100) each of A. marginata var. ovum, A. marginata var. saturalis and their crosses with mean body weights of 12.40 ± 0.58 g were used for the study. The snails were randomly allotted using completely randomized design into three (3) treatment varieties. Results from the study showed significant variety effect (P<0.05) on final body weight and average weight gain. The crossbred variety recorded the highest average weight gain compared to the other two varieties. No significant (P>0.05) variety effect was observed on daily weight gain, total feed intake, daily feed intake and feed conversion ratio. The crossbred variety recorded the highest final body weight and final shell width, indicating heterotic effects on these two bodies and shell parameters. Significant variety effects (P<0.05) were observed on body weight, shell length and shell "mouth" length. The low heterotic values obtained for body weight and the shell parameters supported the assertion that growth traits have low heterotic values which may be due to their high heritability. Though, low and positive heterotic values were obtained for all parameters studied, the crossbred variety recorded the highest heterotic values, which indicated that it may have heterotic advantage over the purebred varieties.

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Variations in growth patterns and conformation of snails: influence of strain and location on isometry of growth in cross river state of Nigeria

Cited by 7 publications

References 0 publications

Genetic differentiation between the black skinned and white skinned snails (Archachatina marginata) using random amplified polymorphic DNAs

Genetic differentiation between the black skinned and white skinned snails (Archachatina marginata) using random amplified polymorphic DNAs

Phenotypic Correlations and Body Weights Prediction Using Morphometric Traits of Snails in Calabar, Nigeria

Comparison of growth and heterosis of body parameters of two varieties of snail [Archachatina marginata (Swainson1821)] and their crosses reared under tropical conditions

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