Skip to main content Accessibility help
×
×
Home

The effect of subclinical intestinal nematode infection on the diet seletion of growing sheep

  • I. Kyriazakis (a1), J.D. Oldham (a1), R.L. Coop (a2) and F. Jackson (a2)

Abstract

To test the hypothesis that subclinical gastrointestinal parasitism, associated with an impairment in N digestion and metabolism and a reduction in the voluntary feed intake (VFI), could affect the diet selection of sheep given a choice between two feeds that differed in their crude protein (CP) content, twenty-four Texel ×Scottish Blackface ewe lambs growing from 28 to 48 kg live weight (LWT) were given a daily dose of 2500 larvae of the intestinal nematode Trichostrongylus colubriformis; twenty-four similar lambs were used as uninfected controls. Six infected and six control lambs were given a free choice between two pelleted feeds (10·4 MJ metabolizable energy/kg), wilh different CP contents (90 (L) and 214 (H) g CP/kg fresh feed respectively). In addition, eighteen parasitized and eighteen control sheep were given access ad lib. to either feed L, or feed H, or their mixture M (164 g CP/kg; twelve per feed), in order to quantify the effects of the feeds when offered alone, and to test for any interactions between feed CP content and parasitism on the performance of the lambs. Intestinal parasitism reduced significantly (P < 0·001) both the rates of LWT gain (by 30%) and VFI (by 10%). The adult and developing parasitic forms took 4 weeks to establish and develop to a significant adult worm population (as judged by the faecal egg counts and blood variables) and until then there was no effect of parasitism on the performance of the lambs. The diet selection of the lambs given a choice between two feeds was similar between the two groups in the first 4 weeks of the experiment, but differed significantly (P < 0·05) in the second part of the experiment (4th week to the end). Thus, while parasitized lambs had a reduced rate of feed intake, by changing their diet selection they achieved a daily rate of CP intake similar to the control ones. However, since the parasitized lambs had a reduced rate of LWT gain, they also consumed a higher total amount of CP to reach the same LWT. It is concluded that sheep infected daily with a small number of larvae of T. colubriformis and given a choice between two feeds that differ in their protein contents are able to modify their diet selection in order to meet the increased protein requirements resulting from such an infection.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      The effect of subclinical intestinal nematode infection on the diet seletion of growing sheep
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      The effect of subclinical intestinal nematode infection on the diet seletion of growing sheep
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      The effect of subclinical intestinal nematode infection on the diet seletion of growing sheep
      Available formats
      ×

Copyright

References

Hide All
Abbott, E. M., Parkins, J. J. & Holmes, P. H. (1988). Influence of dietary prote in on the pathophysiology of haemonchosis in lambs given continuous infections. Research in Veterinary Science 45, 4149.
Agricultural Research Council (1980). The Nutrient Requirements of Ruminant Livestock. Farnham Royal: Commonwealth Agricultural Bureaux.
Bown, M. D. (1986). Protein metabolism in parasitised lambs. PhD Thesis, Lincoln University, New Zealand.
Bown, M. D., Poppi, D. P. & Sykes, A. R. (1991). The effect of post-ruminal infusion of protein or energy on the pathophysiology of Trichostrongylus colubriformis infection and body composition in lambs. Australian Journal of Agricultural Research 42, 253267.
Chiejina, S. N. & Sewell, M. M. H. (1974). Worm burdens, acquired resistance and live weight gains in lambs during prolonged daily infections with Trichostrongylus colubriformis. Parasitology 69, 315327.
Christie, M. G. & Jackson, F. (1982). Specific identification of strongyle eggs in small samples of sheep faeces. Research in Veterinary Science 32, 113117.
Coop, R. L. & Field, A. C. (1983). Effect of phosphorus intake on growth rate, food intake and quality of the skeleton of growing lambs infected with the intestinal nematodes Trichostrongylus vitrinus. Research in Veterinary Science 35, 175181.
Coop, R. L., Sykes, A. R. & Angus, K. W. (1976). Subclinical Trichostrongylosis in growing lambs produced by continuous larval dosing. The effect on performance and certain plasma constituents. Research in Veterinary Science 21, 253258.
Cropper, M. R. (1987). Growth and development of sheep in relation to feeding strategy. PhD Thesis, University of Edinburgh.
Hou, X. Z., Emmans, G. C., Anderson, D. H., Illius, A. W. & Oldham, J. D. (1991). The effect of different pairs of feeds offered as a choice on food selection by sheep. Proceedings of the Nutrition Society 50, 94A.
Kimambo, A. E., MacRae, J. C., Walter, A., Watt, C. F. & Coop, R. L. (1988). Effect of prolonged subclinical infection with Trichostrongylus colubriformis on the performance and nitrogen metabolism of growing lambs. Veterinary Parasitology 28, 191203.
Kyriazakis, I. (1989). Growth, feed intake and diet selection in pigs: theory and experiments. PhD Thesis, University of Edinburgh.
Kyriazakis, I. & Emmans, G. C. (1991). Diet selection in pigs: dietary choices made by growing pigs following a period of underfeeding with protein. Animal Production 52, 337346.
Kyriazakis, I., Leus, K., Emmans, G. C., Haley, C. S. & Oldham, J. D. (1993). The effect of breed (Large White × Landrace v. purebred Meishan) on the diets selected by pigs given a choice between two foods that differ in their crude protein contents. Animal Production 56, 121128.
Kyriazakis, I. & Oldham, J. D. (1993). Diet selection in sheep: the ability of growing lambs to select a diet that meets their crude protein (nitrogen x 6·25) requirements. British Journal of Nutrition 69, 617629.
Poppi, D. P., MacRae, J. C., Brewer, A. C. & Coop, R. L. (1986). Nitrogen transactions in the digestive tract of lambs exposed to the intestinal parasite Trichostrongylus colubriformis. British Journal of Nutrition 55, 593602.
Poppi, D. P., MacRae, J. C., Brewer, A. C., Dewey, P. J. S. & Walker, A. (1985). Calcium and phosphorus absorption in lambs exposed to Trichostrongylus colubriformis. Journal of Comparative Pathology 95, 453464.
Poppi, D. P., Sykes, A. R. & Dynes, R. A. (1990). The effect of endoparasitism on host nutrition – the implications for nutrient manipulation. Proceedings of the New Zealand Society of Animal Production 50, 237243.
Steel, J. W., Symons, L. E. A. & Jones, W. O. (1980). Effects of level of larval intake on the productivity and physiology and metabolic responses of lambs infected with Trichostrongylus colubriformis. Australian Journal of Agricultural Research 31, 821838.
Sykes, A. R. (1983). Effects of parasitism on metabolism in the sheep. In Sheep Production, pp. 317333 [Haresign, W. editor]. London: Butterworths.
Sykes, A. R. (1987). Endoparasites and herbivore nutrition. In Nutrition of Herbivores, pp. 211232 [Harker, J. B. and Ternouth, J. H., editors]. Marrickvale, NSW: Academic Press.
Sykes, A. R. & Coop, R. L. (1976). Intake and utilisation of food by growing lambs with parasitic damage to the small intestine caused by daily dosing with Trichostrongylus colubriformis larvae. Journal of Agricultural Science, Cambridge 86, 507515.
Symons, L. E. A. (1985). Anorexia: occurrence, pathophysiology and possible causes in parasite infections. Advances in Parasitology 24, 103133.
Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

British Journal of Nutrition
  • ISSN: 0007-1145
  • EISSN: 1475-2662
  • URL: /core/journals/british-journal-of-nutrition
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×

Keywords

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed