The effect of non-genetic factors on preweaning survival rate in the Tygerhoek Merino lambs
2002
Gemeda Duguma (Ethiopian Agricultural Research Organization Addis Abeba (Ethiopia) Department of Animal Sciences)S.J. Schoeman
The aim of the study was to investigate the effect of non-genetic factors on preweaning survival rate of Merino lambs maintained at the Tygerhoek Experimental Farm. A total of 8823 lambs born from 1970 to 1994 were used. Average survival rate from birth to 100 days of age was 0.79 and was influenced by lamb birth weight, year of birth, age of dam at lambing, type of birth (single, multiple) and sex of lambs. Lambs with a liveweight between 4.0 to 4.9 kg at birth showed the highest survival rate while lambs with a liveweight of less than or equal to 2.0 kg showed the lowest survival rate.
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