Abstract

Record* collected on 272 Brown Swiss (BS) and 273 Friesian cows maintained over 1978-1987 at the Wahda State Farm in central Iraq, were analysed by the Maxirrum Likelihood method. The cows were originally irrported as pregnant heifers from Austria and Denmark respectively.
In the BS and F 30-, 60-, 90- and 120-day milk yield averaged 328.4, 365.8 kg (P<0.01); 655.7, 692.1 kg; 1029.8, 1105.4 kg; and 1319.4, 1361.8 kg, with h erita b ility estimates of 0.15, 0.174; 0.25, 0.417; 0.471, 0.473; and 0.494, 0.47 respectively. Age at firs t calving, lactation period, calving interval, service period and dry period averaged 33.3, 28.1 months (P<0.01); 320.8, 320.3 days; 418.97, 414.1 days; 138.2, 145.5 days; and 101.3, 102.2 days, with h eritab ility estimates of 0.21, 0.219; 0.011, 0.07; 0.037, 0.027; 0.023, 0.004; and 0.07, 0.006 in the same order.
 

K. H Juma, S. TR Al-Tikriti

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XIV. Dairy cattle genetics and breeding, adaptation and conservation., , 171–174, 1990
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