Birth weight responses to shearing ewes in early to mid gestation

Animal Science

Volumn 70, Issue 2, 2000, Pages 363-369

  Morris, S T ^a   McCutcheon, S N ^a   Revell, D K ^b  

^a MASSEY UNIVERSITY   (New Zealand)

^b MASSEY UNIVERSITY   (New Zealand)

Author keywords

Birth weight; Ewes; Lambs; Pregnancy; Shearing

Indexed keywords

EID: 22944444582     PISSN: 13577298     EISSN: None     Source Type: Journal    
DOI: 10.1017/S1357729800054825     Document Type: Article

References (21)

1. Austin, A. R. and Young, N. E. 1977. The effects of shearing pregnant ewes on lamb birth weights. Veterinary Record 100: 527-529.
2. Bell, A. W., McBride, B. W., Slepetis, R., Early, R. J. and Currie, W. B. 1989. Chronic heat stress and prenatal development in sheep. I. Conceptus growth and maternal plasma hormones and metabolites. Journal of Animal Science 67: 3289-3299.
3. Bigham, M. L., Sumner, R. M. M., Hawker, H. and Fitzgerald, J. M. 1983. Fleece tenderness - a review. Proceedings of the New Zealand Society of Animal Production 43: 73-78.
4. Black, H. J. and Chestnutt, D. M. B. 1990. Influence of shearing regime and grass silage quality on the performance of pregnant ewes. Animal Production 51: 573-582.
5. Dabiri, N., Morris, S. T., Parker, W. J., McCutcheon, S. N. and Wickham, G. A. 1995. Productivity and cold resistance in ewes pre-lamb shorn by standard or cover comb. Australian Journal of Agricultural Research 46: 721-732.
6. Dalton, D. C., Knight, T. W. and Johnson, D. L. 1980. Lamb survival in sheep breeds on New Zealand hill country. New Zealand Journal of Agricultural Research 32: 167-173.
7. Fisher, D. A., Dussault, J. H., Sack, J. and Chopra, I. J. 1977. Ontogenesis of hypothalamic-pituitary-thyroid function and metabolism in man, sheep, and rat. Recent Progress in Hormone Research 33: 59-116.
8. Flux, D. S., Mackenzie, D. D. S. and Wilson, G. F. 1984. Plasma metabolite and hormone concentrations in Friesian cows of differing genetic merit measured at two feeding levels. Animal Production 38: 377-384.
9. Hahn, P. and Hassanali, S. 1982. The effect of 3, 5, 3-triiodothyronine on phospoenol pyruvate carboxykinase, fatty acid synthetase and malic enzyme activity in liver and brown fat of fetal and neonatal rats. Biology of the Neonate 41: 1-7.
10. Kenyon, P. R., Morris, S. T., Revell, D. K. and McCutcheon, S. N. 1999. Improving lamb birthweight through mid to late pregnancy shearing: a review of recent studies. Proceedings of the New Zealand Society of Animal Production 59: 70-72.
11. Maruo, T., Matsuo, H. and Mochizuki, M. 1991. Thyroid hormone as a biological amplifier of differentiated trophoblast function in early pregnancy. Acta Endocrinologica 125: 58-66.
12. Maund, B. A. 1980. Shearing of ewes at housing. Animal Production 30: 481.
13. Mellor, D. J., Slater, J. S. and Matheson, I. C. 1975. Effect of changes in ambient temperature on maternal plasma and allantoic fluid from chronically catheterised ewes during the last two months of pregnancy. Research in Veterinary Science 18: 219-221.
14. Morris, S. T. and McCutcheon, S. N. 1997. Selective enhancement of growth in twin foetuses by shearing ewes in early gestation. Animal Science 65: 105-110.
15. Rattray, P. V., Thompson, K. F., Hawker, H. and Sumner, R. M. W. 1987. Pastures for sheep production. In Livestock feeding on pasture (ed. A. M. Nicol), pp. 89-103. New Zealand Society of Animal Production occasional publication no. 10.
16. Statistical Analysis Systems Institute. 1985. SAS user's guide, statistics, version 5 edition. SAS Institute Inc., Cary, NC.
17. Symonds, M. E., Bryant, M. J. and Lomax, M. A. 1986. The effect of shearing on the energy metabolism of the pregnant ewe. British Journal of Nutrition 56: 635-643.
18. Symonds, M. E., Bryant, M. J., Shepherd, D. A. L. and Lomax, M. A. 1988. Glucose metabolism in shorn and unshorn pregnant sheep. British Journal of Nutrition 60: 249-263.
19. Thompson, G. E., Bassett, J. M., Samson, D. E. and Slee, J. 1982. The effects of cold exposure of pregnant sheep on foetal plasma nutrients, hormones and birthweight. British Journal of Nutrition 48: 59-64.
20. Vipond, J. E., King, M. E., Inglis, D. M. and Hunter, E. A. 1987. The effect of winter shearing of housed pregnant ewes on food intake and animal performance. Animal Production 45: 211-221.
21. Weekes, T. E. C., Sasaki, Y. and Tsuda, T. 1983. Enhanced responsiveness to insulin in sheep exposed to cold. American Journal of Physiology 244: E335-E345.