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Some genetic and environmental factors affecting birth weight of Butana subtype and Friesian X Kenana crosses at Atbara and Nisheishiba Research Centres.

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B. E. Abdel-Aziz,1 T. E. All and F. A. Ahmed

Department of Animal Science, Faculty of Agricultural Sciences, University of
Gezira, p. O. Box 20, Wad medani, Sudan.

SUMMARY

The data set consisted of birth weight records of 3091 Butana and Friesian X Kenana (F X K) crossbred calves born during the years 1960 to 199() at Atbara and Nisheishiba Research Stations.

Dam lactation number, interaction of year X season of birth, breed of calf and sex of calf all had highly significant (P < 0.001) effect on birth weight. The interaction of breed X sex was significant (P < 0.05). Fifth-parity dams gave the heaviest calves at birth (27.63 kg).

The 75% Friesian X Kenana calves were the heaviest among all the four types studied (29.63 kg). However, no significant difference was found between birth weight of 50% F X 50% K. F. crossbreds (26.31 kg) and pure Butana subtype (25.81). heritability of birth weight of Butana subtype was 0.20 ± 0.06.

I. Present address: NI)RC, Shukaha-P. 0. Box 28 Wad Medani south,Sudan.

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