The effects of infection with Haemonchus contortus on the sodium and potassium concentrations in the erythrocytes and plasma, in sheep of different haemoglobin types

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

doi:10.1071/ar9630549

Cited by 50 publications

(14 citation statements)

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“…The phenomenon was more marked in experiment 3 which was a replication of experiment 2. 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).…”

Section: Effect Of Anthelmintic Treatment On Immunity To the Parasitesupporting

confidence: 57%

“…Several studies suggest that haemoglobin A allele provides a higher resistance to H contortus than the haemoglobin B allele (Evans et al, 1963;Jilek and Bradley, 1969;Radhakrishnan et al, 1972;Allonby and TJrquhart, 1976;Dargie, 1976, 1978a, b;Preston and Allonby, 1979;Dally et al, 1980;Luffau et al, 1981a, b;Courtney et al, 1985). According to Cuperlovic et al (1978), this enhanced resistance might be related to a higher humoral immune response.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Effect Of Anthelmintic Treatment On Immunity To the Parasitesupporting

confidence: 57%

Section: Introductionmentioning

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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“…in Bos taurus and Bos indicus cattle were similar to those described by Evans (1963). However, Evans, Blunt and Southcott (1963) showed that infection of sheep with Haemonchus contortus caused similar reductions of P.C.V. and increase in [K+o].…”

Section: Differing Breed Characteristicssupporting

confidence: 64%

Tick Resistance in Cattle: Its Stability and Correlation With Various Genetic Characteristics

Francis

Ashton

1967

Aust J Exp Biol Med

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Summary. Ticks were counted on 51 Droiigbtmaster ancl 12 Bos taurus cattle on about 120 occasions during 1962-64. The mean tick count on the Bos taurus cattle was 15-94 in 1962 which fell to 2-10 by 1964. The respective figures for the Droughtmaster cattle were 2-62 and 0-18. The steady fall in numbers was attributed to the relatively small proportion of female ticks whicli reach maturity on Droughtmaster cattle.Within the group of 51 Droughtmaster cattle the tick burden carried by an individual varied with environmental and other factors, bvit did not alter much relative to other individuals (simple correlation 0-7). Similar results were obtained with the Bos taurus cattle. It is assumed that average tick numbers on the various individuals within a group were inversely related to the tick resistance of the animals concerned.There was no significant correlation between tick infestation and the distribution of alleles at the following loci: haemoglobin, albumin, transferrin, post-albumins and soluble J antigen.There was a signiflcant association between the distribution of amylase genes and tick burden in the Droughtmaster cattle, and a similar but not significant association in the Bos taurus eattle.There was a significant difference in both the mean erythrocyte potassium concentration [K+^J and packed cell volume betweeu the Bos taurus and Droughtmaster cattle, but these characteristics were not correlated with tick burden within the Droughtmaster cattle.

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“…These results contrast with the results of some other workers where superior reproductive performance has been reported for ewes with Hb AA (King et al 1958) or Hb BB (Evans & Turner 1965;Purser & Hall 1974). The lower liveweight of Hb BB ewes may reflect their greater susceptibility to internal parasites (Evans et al 1963;Jilek & Bradley 1969).…”

Section: Discussionmentioning

confidence: 99%

Effects of pre-joining shearing, stress, pasture allowance, and haemoglobin type on reproductive performance of Romney and Marshall Romney ewes

Knight

Hall²,

Lynch³

et al. 1988

New Zealand Journal of Agricultural Research

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In Experiments 1, 2, and 3, mature Marshall Romney (MR) and control Romney (CR) ewes were shorn 3 -30 days before joining whereas in Experiment 4, 1 Yz-year-otd and mature Romney and Border Leicester x Romney ewes were shorn 7 days before joining. In Experiments 1 and 2, MR and CR ewes were single-sire-mated to both MR and CR rams. Haemoglobin (Hb) type of all ewes and rams was determined in these two experiments. In Experiment 3, MR and CR ewes were offered a pasture allowance of either 1.3 or 6.0 kg green DM per ewe per day for 32 days before a synchronised oestrus. Comparing experi.m.e~ts, there were no consistent effects of pre-Jommg shearing on ewes ovulating multiples or ewes lambing multiples. The most consistent response to pre-joining shearing was an increase if!-.ey-!es lambing. This variable response to pre-Jommg shearing cannot be explained by differences in strain or age of ewe or interval from shearing to joining, although in Experiment 1 there was an age of ewe allowance levels did not influence the reproductive response to pre-joining shearing. Half of t~e ~y-!es in Experiment 3 were 'stressed' 7 days before JOInIng by vigorously moving with dogs for 6 h before and 3 h after shearing. There was an interaction between age of ewe and stress for ewes lambing and ew~s lambing multiples. Both traits were depressed m stressed 2Yz-year-old ewes but not in older ewes. Differences in reproductive performan:e between MR and CR ewes were independent of the strain or Hb of the rams to which ewes were mated. MR ewes were 5 -7 kg heavier than CR ewes. In Experiment 1, MR ewes had higher percentages of ewes lambing to first service, ewes lambing, ewes ovulating multiples, and ewes lambing multiples than CR ewes. This was almost entirely explained by the higher liveweight of MR ewes. In Experiment 3 there was a pasture allowance by strain of ewe i~teraction for ewes ovulating multiples and a similar trend for ewes lambing multiples. On a pasture allowance of 1.3 kg green DM per ewe per day MR ewes had more ewes ovulating multiples tha~ CR ewes (28 v. 17%) and similarly for ewes lambing multiples (24 v. 13%). At the higher pasture allowance of 6.0 kg green DM per ewe per day MR ewes had fewer ewes ovulating multiples tha~ CR ewes (16 v. 59%) and fewer ewes lambing multiples (37 v. 49%). Hb type of ewes had no effect on reproductive performance despite Hb BB ewes having a lower liveweight.

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The effects of infection with Haemonchus contortus on the sodium and potassium concentrations in the erythrocytes and plasma, in sheep of different haemoglobin types

Cited by 50 publications

References 0 publications

Resistance to experimental infections with Haemonchus contortus in Romanov sheep

Resistance to experimental infections with Haemonchus contortus in Romanov sheep

Tick Resistance in Cattle: Its Stability and Correlation With Various Genetic Characteristics

Effects of pre-joining shearing, stress, pasture allowance, and haemoglobin type on reproductive performance of Romney and Marshall Romney ewes

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