Mahassin, A. Mohamed, M. S. Bayoumi* and A. M. I. Badi

National Dairy Research Centre, P.O. Box 28, Wad Medani South, Sudan

SUMMARY

Ninety nine cows of Kenana, Butana, cross-bred (Friesian crosses to Kenana or Butana, of different grades), and the mixture type (crossing between Kenana and types, or other Sudanese indigenous cattle), were studied in Barakat area of the Gezira Scheme to examine the potentiality of dairy cow and the correlation between the different production traits. Milk production had been studied according to the type of milking cows. The cow breed showed a very high significant effect (P < 0.001) on milk production and lactation period. The results showed an average milk yield for Kenana, Butana, cross-bred and the mixed type of 661.7 kg in 190.7 days; 688.4 kg in 232.4 days; 1365.2 kg in 249.4 days and 729.3 kg in 187.4 days, respectively. The cross-bred cows proved to be superior and significantly (P < 0.001) outyielded the Kenana, Butana and the mixed types, with longer duration of milking. On the other hand milk composition showed no significant differences between type of cows . The respective

* Present address: Institute of Animal Production, U. of K., P. 0. Box 32, Khartoum North, Sudan.

values for the average daily milk yield for Kenana, Butana, cross­bred and the mixed type were 3.2 kg, 3.5 kg. 6.1 kg and 3.7 kg. Milk yield had a very high positive correlation (r = 0.98) with butter-fat, protein and solids-not-fat yields. Lactation period had a high positive correlation (r = 0.70) with butter-fat, protein and solids-not-fat yields. Milk yield was negatively correlated with butter-fat, protein and solids-not-fat percent.

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