There were 1,111 records of 155 White Fulani cows covering the years 1978 through 1986. Records, irrespective of length up to 400 days for one or more calvings, were used to estimate the heritability of lactation length and for the determination of correlation between lactation length and milk yield. Adjustment for short records (abnormal records) due to death of calf, cow died, cow sick and transfers were made to avoid the customary procedure of deleting short records when attempting to evaluate differences among cows of breeds indigenous to tropical areas. Results indicate a moderately high heritability of 0.30 _+ 0.14 and low repeatability of 0-15 ± °-07 for lactation length. Also, correlation level as high as 0.8 was observed between length of lactation and milk yield.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 499–501, 1994
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