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Growth of cross-bred Dorset Horn lambs from East African Blackheaded Sheep

  • J. C. M. Trail (a1) and G. D. Sacker (a1)

Summary

The growth of ½ ⅝, and ¾ bred Dorset Horn lambs was examined in Western Uganda. These were produced by mating Dorset Horn rams with East African Blackheaded, ¼ bred Dorset and 1/2 bred Dorset females respectively.

The influence of type of birth (single or twin) was maximum at the end of the main 2-month suckling period and progressively decreased to 11 months of age. The influence of maternal age did not decline as lambs grew older. Dorset ewes, ¼ and ½-bred, had superior milking capabilities, as measured by lamb growth at 2 months of age, to indigenous ewes. Lambs, ⅝ and ¾-bred, were 26 % heavier than ½-bred lambs at 2 months of age, and as all three types grew at the same rate from 2 to 11 months, ⅝- and ¾-bred lambs retained this initial advantage.

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References

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Harvey, W. R. (1960). Least-squares analysis of data with unequal subclass numbers. Bull. U.S. Dep.Agric. agric. Res. Serv. 20–8.
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Hunter, G. L. (1956). The maternal influence on size in sheep. J. agric. Sci., Camb. 48, 36.
Sacker, G. D. & Trail, J. C. M. (1966). Production characteristics of a flock of East African Blackheaded sheep. E. Afr. agric. For. J. 31, 392.
Trail, J. C. M. & Sacker, G. D. (1966). Production records of lambs from East African Blackheaded ewes and Dorset Horn rams. E. Afr. agric. For. J. 32, 133.
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Growth of cross-bred Dorset Horn lambs from East African Blackheaded Sheep

  • J. C. M. Trail (a1) and G. D. Sacker (a1)

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