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The effect of inbreeding on feed consumption and utilisation by sheep

Published online by Cambridge University Press:  02 September 2010

J. M. Doney
J. M. Doney
Affiliation:
Hill Farming Research Organisation, 29 Lauder Road, Edinburgh 9
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Extract

Twelve inbred (coefficient of inbreeding 25%) and 12 outbred, singlereared, Scottish Blackface castrated male lambs were taken at six months of age from amongst the progeny of three rams. They were housed and fed individually on a pelleted diet in three separate phases. In the first two phases restricted amounts were offered. These were calculated to produce, firstly, a small rate of live-weight gain and, secondly, a small rate of live-weight loss. In the third phase feed was offered to maximum voluntary intake during 2 two-hour periods daily.

On restricted intakes there were no significant differences between the groups. In the third phase the outbred sheep consumed 17% more feed than the inbred group and the daily rates of live-weight gain and wool growth were 33% and 27% higher, respectively. Since the inbred lambs were smaller, the voluntary intake per unit live-weight did not differ significantly between groups.

The estimated requirements of feed for maintenance (20·1 ± 0·4 and 21·9±0·6 g./kg. live-weight, respectively, for the outbred and inbred groups) differed significantly. There were no apparent differences in the estimated efficiency of conversion of available surplus feed to body tissue or wool growth.

Information

Type
Research Article
Information
Animal Production , Volume 9 , Issue 3 , August 1967, pp. 359 - 364
Copyright
Copyright © British Society of Animal Science 1967

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References

REFERENCES

Blaxter, K. B., Wainman, F. W., & Wilson, R. S., 1961. The regulation of food intake by sheep. Anim. Prod., 3: 51–61.Google Scholar
Doney, J. M., 1957. Effects of inbreeding on four families of Peppin Merinos. Aust. J. agric. Res., 8: 299–311.CrossRefGoogle Scholar
Doney, J. M., 1959. Effects of inbreeding on four families of Peppin Merinos. III. The influence of crude pituitary extract. Aust. J. agric. Res., 10: 97–107.CrossRefGoogle Scholar
Doney, J. M., 1964. The fleece of the Scottish Blackface sheep. IV. The effects of pregnancy, lactation and nutrition on seasonal wool production. J. agric. Sci., Camb., 62: 59–66.CrossRefGoogle Scholar
Doney, J. M., 1966. Inbreeding depression in grazing Blackface sheep. Anim. Prod., 8: 261–266.Google Scholar
Ferguson, K. A., 1956. The efficiency of wool growth. Proc. Aust. Soc. Anim. Prod., 1: 58–62.Google Scholar
Hazel, L. N., & Terrill, C. E., 1946. The effect of some environmental factors on fleece and body characteristics of range Rambouillet yearling ewes. J. Anim. Sci., 5: 382–388.CrossRefGoogle Scholar
Morley, F. H. W., 1954. Selection for economic characters in Australian Merino sheep. IV. The effects of inbreeding. Aust. J. agric. Res., 5: 305–316.CrossRefGoogle Scholar
Schultze, A. B., & Turner, C. W., 1948. Relation of endocrine gland weight to body weight in growing and mature female dairy goats. Mo. agr. Exp. Sta. Res. Bull. no. 427.Google Scholar