Variation in the Gene Frequencies of Potassium and Haemoglobin Types in Romney Marsh and Southdown Sheep Established Away From Their Native Environment

Evans, J. V.; Blunt, M.H.

doi:10.1071/bi9610100

Cited by 17 publications

(6 citation statements)

References 10 publications

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“…The Hb type BB was predominant in sheep under study. This result agrees with the reports of Templeton (1969) in different sheep breeds, Gootwine (1988) in Assaf sheep, Rodero et al (1996) From earlier reports it has been documented that the frequencies of the two hemoglobin alleles vary from breed to breed within the same species and seem to be correlated with particular environments (Evans and Blunt, 1961;Evans and Turner, 1965). Evans and Blunt (1961) after investigating the frequency of Hb A and Hb B in 33 breeds of British sheep, revealed that the breeds of sheep that were common to higher altitudes had a significant higher frequency of Hb A, and the breeds that were common to lower altitudes had a significant higher frequency of Hb B.…”

Section: Results:-supporting

confidence: 92%

Preliminary Investigation of Hemoglobin Polymorphism and Its Association With Some Morphometric Traits and Hematological Parameters of Sheep and Goats in Northeastern Libya.

Sitmo¹,

Saad²

2018

IJAR

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Local sheep and goats in northeastern Libya were studied for hemoglobin polymorphism. The study was also aimed to unveil a possible relationship that might exist between hemoglobin genotypes, some selected morphometric traits, and hematological parameters. Both phenotypic data and blood samples were collected from a total of 69 adult sheep and 23 adult goats of both sexes. The blood parameters, hemoglobin concentration and packed cell volume values were determined and then the red blood cells were extracted, lysed, and subjected to agarose gel electrophoresis. Two variants of hemoglobin, Hb A and Hb B with a frequency of 0.22, 0.78, and 0.63, 0.37, respectively for pooled sheep and goats populations were observed; indicating the predominance of Hb B in sheep and Hb A in goats. These co-dominant alleles caused the presence of three Hb genotypes AA, BB and AB in both sheep and goats. The largest number of animals of sheep belong to Hb BB (62.32%) and the smallest number to HbAA (5.80%). For goats, the genotype AA had the higher frequency (52.17%) and the type AB was less spread (21.74). The body parameters, body long, shoulder height, chest perimeter, and horn length were not significantly influenced (P>0.05) by Hb variants in populations under the study. Hb genotypes also had no significant (P>0.05) effect on hemoglobin and packed cell volume values.

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Section: Results:-supporting

confidence: 92%

Preliminary Investigation of Hemoglobin Polymorphism and Its Association With Some Morphometric Traits and Hematological Parameters of Sheep and Goats in Northeastern Libya.

Sitmo¹,

Saad²

2018

IJAR

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“…Following the observation that flocks in which Hb A is predominant are confined to latitudes above 40°, the theory was advanced that Hb polymorphism may have adaptive significance. The study of E VANS & BLUNT (1961), showing that movement of a breed away from its place of origin appears to have an effect on the Hb allele frequencies, supports this idea.…”

Section: Introductionmentioning

confidence: 53%

Haemoglobin type frequencies in the Assaf (Awassi x East Friesian) dairy sheep 20 years after its formation

GOOTWINE¹

1988

Genet. Sel. Evol.

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SummaryHaemoglobin allele frequencies were examined in 195 ewes and 6 rams belonging to the Assaf cross (Awassi x East Friesian). The frequency of the Hb A allele was 0.14 indicating a decline in Hb A frequency in the Assaf during the last 20 years. Ewes belonging to the AB genotype showed a significant advantage over the BB genotype in both lamb and milk production in the first lactation. It is suggested that the haemoglobin polymorphism in the Assaf is maintained due to an advantage of AB heterozygotes for production and survival.

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“…tion are known to occur in sheep (Mehrotra & Mullick, 1959). As the existence of two blood potassium types in sheep may have an adaptive Experimental significance (Evans & Blunt, 1961), we have…”

Section: Introduction Materials and Methodsmentioning

confidence: 99%

Seasonal variations in blood composition in high and low potassium type Marwari sheep

et al. 1971

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SummaryBlood samples were obtained at monthly intervals for 12 months from 8 HK and 8 LK wethers of the Marwari breed maintained at Jodhpur (26° 05′ N, 73° 01′ E). The samples were analysed for packed cell volume (PCV), red blood cell count (RBC), haemoglobin concentration (Hb), mean cell volume (MCV), mean cell haemoglobin concentration (MCHC), plasma inorganic phosphorus and plasma specific conductance.The HK animals, on average, had significantly higher PCV, RBC, Hb, MCHC and plasma inorganic phosphorus values than the LK animals but the MCV was significantly higher in the LK group. There was no difference in the plasma specific conductance.PCV, RBC and Hb values differed considerably from animal to animal within each group. These individual variations could help the breed to survive in a desert environment.No particular tendency or pattern in the effect of season on the blood characters studied has been observed. This indicates that the animals of both groups responded in a similar way to the environmental changes.

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Variation in the Gene Frequencies of Potassium and Haemoglobin Types in Romney Marsh and Southdown Sheep Established Away From Their Native Environment

Abstract: The gene frequencies for high potassium and haemoglobin type A have been determined in flocks of Romney Marsh and Southdown sheep in New South Wales and these frequencies have been compared with those found in Great Britain.

Cited by 17 publications

References 10 publications

Preliminary Investigation of Hemoglobin Polymorphism and Its Association With Some Morphometric Traits and Hematological Parameters of Sheep and Goats in Northeastern Libya.

Preliminary Investigation of Hemoglobin Polymorphism and Its Association With Some Morphometric Traits and Hematological Parameters of Sheep and Goats in Northeastern Libya.

Haemoglobin type frequencies in the Assaf (Awassi x East Friesian) dairy sheep 20 years after its formation

Seasonal variations in blood composition in high and low potassium type Marwari sheep

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