Birth weights of 985 pure Friesian calves produced by 304 imported cows and their locally born daughters during 1978-1982 at the A p ril 7th State Farm, were analysed by the least squares method* Birth weight averaged 34*3 Mg; males excelled females by 2*4 kg (p < *O l)* P a rity , gestation period, dam*s country o f origin , and month, season and year of calving each affected c a lf b irth weight (p < .o l)* B irth weight increased steadily with advancing age of dam and with increasing length o f gestation* Spring and summer born calves were heavier at b irth than autumn and w in te r born calves* L oca lly born sews produced sm aller calves than imported cows* The repeatability of b irth weight was .151*
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XI. Genetics of reproduction, lactation, growth, adaptation, disease, and parasite resistance., , 535–538, 1986
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