Blood potassium and haemoǵlobin polymorphism in Indian sheep

Agar, N.S.; Rawat, J. S.; Roy, Aniruddha

doi:10.1017/s0021859600014386

Cited by 21 publications

(21 citation statements)

References 15 publications

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“…For the M system (frequently described only in terms of high or low blood potassium) and the Tf and Hb loci wide variations in frequencies are to be found in other reports (see Agar, Evans and Roberts, 1972;Stormont et al, 1968). Explanations based on adaptation to particular environments have been put forward but the present data are not suitable to test such hypotheses.…”

Section: Correlations Between Blood Group Locimentioning

confidence: 70%

Effects of crossbreeding and inbreeding on the frequencies of blood groups in three breeds of sheep

Rasmusen¹,

Hall²,

Hayter³

et al. 1974

Anim. Sci.

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Blood groups were determined for eight loci in a total of 742 sheep and for the Tf (transferrin) locus of 512 sheep comprising the Scottish Blackface, the Cheviot and the Welsh Mountain breeds and their crosses. Each breed and cross was represented by a noninbred F2 generation and by three stages of inbreeding (25, 37-J-and 50%). The loci for which all genotypes were distinguished were Hb, M, and Tf, and those for which partial description (including the recessive homozygote) was made were A, B, C, D, R and i. There were large differences among the three pure breeds only for the frequencies at the Hb and Tf loci. The homozygote frequencies of the Blackface-Welsh and Cheviot-Welsh crosses were approximately half-way between their respective pure breeds. For the Blackface-Cheviot cross the homozygote frequency was considerably lower than either parental breed, suggesting that over all loci there were greater differences in gene frequencies between these two breeds than between the Blackface and Welsh or Cheviot and Welsh. On average over all loci (except Tf) inbreeding had the effect of decreasing heterozygosity roughly in relation to expectation. Individually this effect was statistically significant only for ii, M h M b , Hb A Hb A and Hb b Hb b . For the Tf locus there was no average decrease in heterozygosity as a result of 25 % inbreeding but thereafter there was a greater decrease in the purebreds than in the crosses. There were small (< 0-20) but significant residual correlations between R-O-H blood types and genotypes at several other loci, and between dd and the M system genotypes.

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Section: Correlations Between Blood Group Locimentioning

confidence: 70%

Effects of crossbreeding and inbreeding on the frequencies of blood groups in three breeds of sheep

Rasmusen¹,

Hall²,

Hayter³

et al. 1974

Anim. Sci.

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“…In experiment 5, the same trend was observed (figure 2), but the difference between the 2 groups was not significant ( (Blum and Cioli, 1978;Deelder et al, 1978;Perrudet-Badoux et al, 1978;Wakelin, 1978 (Evans et al, 1963;Jilek and Bradley, 1969;Radhakrishnan et al, 1972;Allonby and Urquhart, 1976;Dargie, 1976, 1978a, b;Preston and Allonby, 1979;Dally et al, 1980;Luffau et al, 1981a, b;Courtney et al, 1985), but they are in keeping with the results of Le Jambre (1978), R,iffkin and Dobson (1979), Courtney et al (1984), Riffkin and Yong (1984) Evans and Whitlock (1964), Radhakrishnan et al (1972), Dargie (1976, 1978a, b) and Albers and Burgess reported by Piper (1987). The post-infection differences observed between animals of various haemoglobin genotypes might simply be due to differences existing in non-infected animals (Agar et al, 1972). These differences might arise from oxygen affinity differences between haemoglobins A and B. Haemoglobin A has a higher oxygen affinity: at equal pressure, it releases less oxygen, which might cause the creation of compensatory mechanisms in haemoglobin A carriers (Agar et ad, 1972 (1984, 1985, 1986, 1987 and 1988) who found an association between the OLA system and the response to a vaccination against Trichostrongylus colubrifo!rmas.…”

Section: Effect Of Anthelmintic Treatment On Immunity To the Parasitementioning

confidence: 99%

Resistance to experimental infections with Haemonchus contortus in Romanov sheep

Luffau¹,

Khang²,

Bouix³

et al. 1990

Genet. Sel. Evol.

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Summary -Responses to immunization with aggregated human serum albumin (HSA) and to repeated experimental infections with H contortus were studied in 51 female lambs of the Romanov breed, born from 8 sires and 36 dams. The 8 sires were of haemoglobin genotype Hb AB; the 51 lambs were distributed into 3 groups of 17 each, corresponding to the 3 genotypes HbAA, HbAB and HbBB. In addition the experimental lambs were typed for antigens of the major histocompatibility system (OL./1). The

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“…In the previous works it has been stated that the potassium blood level in sheep is genetically controlled by two alleles K L and K H , the second one recessive (Agar et al, 1972;Bhat et al, 1981;Bojczuk, 1987;Kumar, 1984;Lazovski and Spiridonov, 1974;Lipecka et al, 1987;1991). Homozygotes of the K H gene are characterized by a high potassuim level in blood (level HK), while those of the K L gene and heterozygotes by a low potassium blood level (level LK).…”

Section: Introductionmentioning

confidence: 99%

“…These studies have also proved that there is a considerable differentiation between breeds, kinds, and even a differentiation within a breed between flocks in the frequency of occurrence of genes and phenotypes. Simultaneously the potassium level is reflected in differentiated physiological and biochemical changes (Agar et al, 1972). This can affect the productivity level of animals, constituting a certain selective index.…”

Section: Introductionmentioning

confidence: 99%

The potassium level in the blood of sheep and their productivity

Lipiecka

Pięta²,

Gruszecki³

1994

J. Anim. Feed Sci.

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The production value of sheep having a high or low blood potassium level were investigated. The K level in the whole blood of the five month old lambs was determined and classified into the respective phenotype: LH and HK. The study were carried out on 871 lambs and 312 ewes.In the tested population, the frequency of gene K H in lambs was 0.427, whereas in ewes 0.540. The average level of potassium in blood in 5 month old lambs was found to be 30.5 mmol/1 in the HK phenotype and 9.3 mmol/1 in the LH phenotype. The results also showed that potassium-determined phenotypes had similar body weight after birth (5.1 kg), at the age of 28 (13.3) and 100 days (30.0 kg), and at 12 months (72.3 kg). The ewes had also an approximate yield of greasy wool both from the first (about 4.5 kg) and second (6.7 kg) shearing performed at the age of 10 and 22 months. A significantly lower fertility and reproduction performance was found in ewes of the HK phenotype.

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Blood potassium and haemoǵlobin polymorphism in Indian sheep

Cited by 21 publications

References 15 publications

Effects of crossbreeding and inbreeding on the frequencies of blood groups in three breeds of sheep

Effects of crossbreeding and inbreeding on the frequencies of blood groups in three breeds of sheep

Resistance to experimental infections with Haemonchus contortus in Romanov sheep

The potassium level in the blood of sheep and their productivity

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