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The effects of two nutritional environments from 6 weeks pre partum to 12 months of age on lifetime performance and reproductive potential of Scottish Blackface ewes in two adult environments

Published online by Cambridge University Press:  02 September 2010

R. G. Gunn
R. G. Gunn
Affiliation:
Hill Farming Research Organisation, Bush Estate, Penicuik, Midlothian EH26 0PY
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Summary

In one experiment, 227 female sheep in two age groups were reared on low (107 sheep) and high (120 sheep) levels of nutrition from birth to 12 mo of age after their dams had been given low and high levels of nutrition during the last 6 weeks of pregnancy. From 12 mo, 47 of the low-level sheep and 51 of the high were grazed on poor hill pasture to provide a low-level adult nutritional environment while 46 of the low level and 52 of the high were grazed on good quality pasture to provide a high-level adult nutritional environment. These treatments were continued for 5 production years for one age group and 4 production years for the other.

Live-weight differences associated with rearing treatment persisted throughout the experiment in both adult environments. Lifetime lamb production was significantly affected by both rearing and adult treatments.

The effects of these treatments on reproductive potential were examined in a second experiment by determination of ovulation rate when the sheep were brought into uniform good body condition at mating after the end of the first experiment. Potential ovulation rate was significantly affected by rearing treatment but not by adult treatment, although live weight and body size were affected by both.

It is concluded that while reproductive potential is related to body size it may also be influenced by the pattern of early growth during unidentified developmental stages.

Information

Type
Research Article
Information
Animal Production , Volume 25 , Issue 2 , October 1977 , pp. 155 - 164
Copyright
Copyright © British Society of Animal Science 1977

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References

REFERENCES

Allden, W. G. 1968a. Undernutrition of the Merino sheep and its sequelae. I. The growth and development of lambs following prolonged periods of nutritional stress. Aust. J. agric. Res. 19: 621–638.CrossRefGoogle Scholar
Allden, W. G. 1968b. Undernutrition of the Merino sheep and its sequelae. II. The influence of finite periods of arrested growth on the subsequent wool growth, fleece development, and utilization of feed for wool production of lambs. Aust. J. agric. Res. 19: 639–648.CrossRefGoogle Scholar
Allden, W. G. 1968C. Undernutrition of the Merino sheep and its sequelae. III. The effect on lifetime productivity of growth restrictions imposed at two stages of early postnatal life in a Mediterranean environment. Aust. J. agric. Res. 19: 981–996.CrossRefGoogle Scholar
Allden, W. G. 1968d. Undernutrition of the Merino sheep and its sequelae. IV. Herbage consumption and utilization of feed for wool production following growth restrictions imposed at two stages of early postnatal life in a Mediterranean environment. Aust. J. agric. Res. 19: 997–1007.CrossRefGoogle Scholar
Bradford, G. E., Weir, W. C. and Torell, D. T. 1961. The effect of environment from weaning to first breeding on lifetime production of ewes. J. Anint. Sci. 20: 281–287.Google Scholar
Coop, I. E. and Clark, V. R. 1955. The influence of method of rearing as hoggets on the lifetime productivity of sheep. N.Z. Jl Sci. Technol. A 37: 214–228.Google Scholar
Giles, J. R. 1968. The effects of different levels of nutrition from weaning to seventeen months of age on the lifetime production of Merino ewes. Aust. J. exp. Agric. Anim. Husb. 8: 149–157.CrossRefGoogle Scholar
Gunn, R. G. 1968. Levels of first winter feeding in relation to performance of Cheviot hill ewes. VI. Life-time production from the hill. J. agric. Sci., Camb. 71: 161–166.CrossRefGoogle Scholar
Gunn, R. G. 1972. Growth and lifetime production of Scottish Blackface hill ewes in relation to the level of feeding during rearing. Anim. Prod. 14: 343–349.Google Scholar
Gunn, R. G., Doney, J. M. and Russel, A. J. F. 1972. Embryo mortality in Scottish Blackface ewes as influenced by body condition at mating and by post-mating nutrition. J. agric. Sci., Camb. 79: 19–25.CrossRefGoogle Scholar
Reardon, T. F. and Lambourne, L. J. 1966. Early nutrition and lifetime reproductive performance of ewes. Proc. Aust. Soc. Anim. Prod. 6: 106–108.Google Scholar
Russel, A. J. F., Doney, J. M. and Gunn, R. G. 1969. Subjective assessment of body fat in live sheep. J. agric. Sci., Camb. 72: 451–454.CrossRefGoogle Scholar
Schinckel, P. G. and Short, B. F. 1961. The influence of nutritional level during prenatal and early post-natal life on adult fleece and body characters. Aust. J. agric. Res. 12: 176–202.CrossRefGoogle Scholar