Department of Animal Production, Omer Elmokhtar University
For Agricultural Sciences, Elbeida, Libya.

SUMMARY

The performance of Friesian and Jersey cows in seven dairy units in Benghazi and Eljabel Elakhder was summerized. Age at first calving (days) was 764.4 — 926.2 for Jersey and 770.4 — 1006.1 for Friesian. Calving interval (days) were 395.7 441.0 for Jersey and 384.2 —452.3 for Friesians. Calf birth weight (kg) was 18.3 — 22.9 for Jersey and 34.1 — 37.3 for Friesian. Calf mortality was 1.9 — 20.0% for Jersey and 7.9 — 25.3% for Friesians. Number of services / conception and calf born respectively were 1 — 1.73 and 1 — 86 for Jersey and 1 and 1.04 — 1.06 for Friesian.

The performance of Jersey and Friesian dairy cows in Benghazi and Eljabel Elakhder dairy units in Libya was satisfactory and was relatively better than in most developing countries.

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