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An evaluation of the effects of incisor dentition and of age on the performance of lactating ewes and their lambs

Published online by Cambridge University Press:  02 September 2010

H. Dove  and
J. A. Milne
H. Dove
Affiliation:
CSIRO Division of Plant Industry, GPO Box 1600, Canberra, ACT 2601, Australia
J. A. Milne
Affiliation:
Macaulay Land Use Research Institute, Pentlandfield, Roslin, Midlothian EH25 9RF
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Abstract

Ninety-six Border Leicester × Scottish Blackface ewes, aged 2 to 6 years, grazed perennial ryegrass pastures during lactation. The state of their incisor teeth was assessed at parturition on a scale from score 1 (sound teeth) to score 4 (poor teeth). Their live weights and condition scores during lactation were then related to incisor score and age by regression analysis. Lamb growth was similarly analysed. Herbage intakes and milk production were measured in a subset of 24 ewes.

Ewe live weights were significantly lower, per unit incisor score, by 2·2, 2·5 and 2·1 kg at days 22, 50 and 96 of lactation respectively. In ewes with twin lambs, the equivalent reductions were 1·6, 2·8 and 2·1 kg respectively. Reductions in condition score, whilst still significant, were less marked. After adjusting for the effects of incisor dentition, there was no effect of age on ewe live weight or condition score.

Incisor dentition did not markedly affect herbage intake or milk production, except in measurements at day 53 of lactation, where higher incisor scores resulted in significant reductions in the production of milk and its components. Effects on lamb performance were confined to twins, where live-weight gain to day 50 was reduced by 12·2 g/day, per unit increase in ewe incisor score. This resulted in reductions of 0·7 kg (day 50) and 0·9 kg (weaning) in the live weight of twin lambs.

Keywords

agedentitionewesherbagemilk production
Type
Research Article
Information
Animal Production , Volume 53 , Issue 2 , October 1991 , pp. 183 - 190
Copyright
Copyright © British Society of Animal Science 1991

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References

Arnold, G. W., McManus, W. R. and Bush, I. G. 1966. Studies in the wool production of grazing sheep. 5. Observations on teeth wear and carry over effects. Australian Journal of Experimental Agriculture and Husbandry 6: 101–107.CrossRefGoogle Scholar
Association of Official Analytical Chemists. 1970. Official methods of analysis, 11th ed. (ed. Horwitz, W.). Association of Official Analytical Chemists, Washington DC.Google Scholar
Barnicoat, C. R. 1957. Wear in sheep's teeth I-V. New Zealand Journal of Science and Technology A38: 583–632.Google Scholar
Coop, I. E. and Abrahamson, M. 1973. Effect of teeth condition on intake of grazing sheep. New Zealand Journal of Experimental Agriculture 1: 58–64.CrossRefGoogle Scholar
Donnelly, J. R., Morley, F. H. W. and McKinney, G. T. 1982. The productivity of breeding ewes grazing on lucerne or grass and clover pastures on the Tablelands of southern Australia. 1. Reproduction. Australian Journal of Agricultural Research 33: 1085–1097.CrossRefGoogle Scholar
Dove, H. 1988. Estimation of the intake of milk by lambs, from the turnover of deuterium- or tritium-labelled water. British Journal of Nutrition 60: 375–387.CrossRefGoogle ScholarPubMed
Dove, H., Milne, J. A. and Mayes, R. W. 1990. Comparison of herbage intakes estimated from in vitro- or alkane-based digestibilities. Proceedings of the New Zealand Society of Animal Production 50: 457–459.Google Scholar
Dove, H., Milne, J. A., Sibbald, A. M., Lamb, C. S. and McCormack, H. A. 1988. Circadian variation in abomasal digesta flow in grazing ewes during lactation. British Journal of Nutrition 60: 653–668.CrossRefGoogle ScholarPubMed
Duckworth, J., Hill, R., Benzie, D., Dalgarno, A. C. and Robinson, J. F. 1962. Studies of the dentition of sheep. 1. Clinical observations from investigations into the shedding of permanent incisor teeth by hill sheep. Research in Veterinary Science 3: 1–17.CrossRefGoogle Scholar
Field, A. C., Sykes, A. R. and Gunn, R. G. 1974. Effects of age and state of incisor dentition on faecal output of dry matter and on faecal and urinary output of nitrogen and minerals, of sheep grazing hill pastures. Journal of Agricultural Science, Cambridge 83: 151–160.CrossRefGoogle Scholar
Gunn, R. G. 1967. Levels of first winter feeding in relation to performance of Cheviot hill ewes. V. Dental development and persistence. Journal of Agricultural Science, Cambridge 69: 345–348.CrossRefGoogle Scholar
Gunn, R. G. 1969. The effects of calcium and phosphorus supplementation on the performance of Scottish Blackface hill ewes, with particular reference to the premature loss of permanent incisor teeth. Journal of Agricultural Science, Cambridge 72: 371–378.CrossRefGoogle Scholar
Gunn, R. G. 1970. A note on the effect of broken mouth on the performance of Scottish Blackface hill ewes. Animal Production 12: 517–520.Google Scholar
Healy, W. B., Cutress, T. W. and Michie, C. 1967. Wear of sheep's teeth. IV. Reduction of soil ingestion and tooth wear by supplementary feeding. New Zealand Journal of Agricultural Research 10: 201–209.CrossRefGoogle Scholar
Healy, W. B. and Ludwig, T. G. 1965. Wear of sheep's teeth. I. The role of ingested soil. New Zealand Journal of Agricultural Research 8: 737–752.CrossRefGoogle Scholar
Meat and Livestock Commission. 1981. Feeding the ewe. 2nd ed. Meat and Livestock Commission, Milton Keynes.Google Scholar
Milne, J. A., Maxwell, T. J. and Souter, W. 1981. Effect of supplementary feeding and herbage mass on the intake and performance of grazing ewes in early lactation. Animal Production 32: 185–195.Google Scholar
Newton, J. E. and Jackson, C. 1983. A note on the effect of dentition and age in sheep on the intake of herbage. Animal Production 37: 133–136.Google Scholar
Newton, J. E. and Jackson, C. 1984. The effect of age on tooth loss and the performance of Masham ewes. Animal Production 39: 421–425.Google Scholar
Porter, W. L., Scott, R. S. and Manktelow, B. W. 1970. The occurrence of paradontal disease in sheep in relation to superphosphate topdressing, stocking rate and other related factors. New Zealand Veterinary Journal 18: 21–27.CrossRefGoogle ScholarPubMed
Russel, A. J. F., Doney, J. M. and Gunn, R. G. 1971. The distribution of chemical fat in the bodies of Scottish Blackface ewes. Animal Production 13: 503–509.Google Scholar
Standing Committee on Agriculture. 1990. Feeding standards for Australian livestock. Ruminants (convenor, J. L. Corbett). Commonwealth Scientific and Industrial Research Organisation.Google Scholar
Suckling, G. W., Cutress, T. W., Healy, W. B. and Mattingley, J. 1974. Effects of liming a highly leached soil on periodontal health, serum composition, and body weight of sheep. New Zealand Journal of Agricultural Research 17: 311–316.CrossRefGoogle Scholar
Sykes, A. R., Field, A. C. and Gunn, R. G. 1974a. Effects of age and state of incisor dentition on body composition and lamb production of sheep grazing hill pastures. Journal of Agricultural Science, Cambridge 83: 135–143.CrossRefGoogle Scholar
Sykes, A. R., Field, A. C. and Gunn, R. G. 1974b. Effects of age and state of incisor dentition on the chemical composition of the skeleton of sheep grazing hill pastures. Journal of Agricultural Science, Cambridge 83: 145–150.CrossRefGoogle Scholar
Treacher, T. T. 1983. Nutrient requirements for lactation in the ewe. In Sheep production (ed. Haresign, W.), pp. 133–153. Butterworths, London.Google Scholar