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Some factors affecting Friesian calf mortality rate from birth to weaning [electronic resource].

By:

Metwally, A. M

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Language: English Summary language: Arabic Description: p.418-432Other title:

بعض العوامل المؤثرة على معدل نفوق عجول الفريزيان من الميلاد وحتي الفطام [Added title page title]

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Journal of agricultural research Tanta University, 2003 v.29 (3) [electronic resource].

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In: Journal of Agricultural Research Tanta University 2003.v.29(3)Summary: A total of 322 mortalities out of3363 newly born Friesian calves were recorded from birth to 16 wedes of age during the period from. 1983 to 2002. The effects of year and month of birth, lethal diseases,dam parity, sex of calf and birth weight on calf mortality rate (CMR) were studied. The results revealed that all the previous factors significantly (P < 0.05 or 0.01) affected CMR. The overall mean of CMR. was 9.57% during the experimental period. Of all recorded cases 49.7% occurred during the last 4 years,and the remainder 50.3% occurred during the first, 16 years. Losses in March, June and July were greater compared to other months of the year.

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A total of 322 mortalities out of3363 newly born Friesian calves were recorded from birth to 16 wedes of age during the period from. 1983 to 2002. The effects of year and month of birth, lethal diseases,dam parity, sex of calf and birth weight on calf mortality rate (CMR) were studied. The results revealed that all the previous factors significantly (P < 0.05 or 0.01) affected CMR. The overall mean of CMR. was 9.57% during the experimental period. Of all recorded cases 49.7% occurred during the last 4 years,and the remainder 50.3% occurred during the first, 16 years. Losses in March, June and July were greater compared to other months of the year.

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