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Changes of milk and fat yields in the first three lactations of Lowland Red-White /LRW/ and LRW x HF hybrid cows with various contribution of HF genes were investigated. The cows were kept in two big herds with average milk yield 5000 kg per cow per year. The research showed that the hybrid cows had more even first lactation curves when compared to LKW cows. The most even were first lactations of...
The studies have been carried out on 202 black-white and red-white hybrids of various blood percentage. The results of the studies have enabled the initial evaluation of 75% HF hybrids. The black-white hybrids produced in the first lactation 649 kg of milk more than their mothers whereas the red-white hybrids proved to be better by 707 kg. Fat yield in both populations of the hybrids was higher compared...
The data of 234 lactations In 111 bw cows, 217 lactations in 118 crossbred /50% HF/ cows and 275 lactations in 135 crossbred half-blood Swedish-freslan cows were studied. The cows were used in three herds of high productivity /average yield in bw primlgravida during 305 day lactation period reached 390 kg/ in south-west Poland. Statistically significant differences in milk production traits were shown...
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