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Genetic and environmental factors affecting some measures of yield and fertility in a registered Canadian Holstein dairy herd in Iran
Published online by Cambridge University Press: 20 November 2017
Extract
Milk production is the most important trait in dairy cattle breeding. Measures of additional traits are also important. Traits of lactation curve are important in their relation to production characteristics. The two major reasons for which dairy cows are disposed are fertility problems and low milk yield (Hansen et al.,1983). The objectives of this study were 1) To evaluate effects of some environmental factors on some measures of yield and fertility, and 2) To estimate genetic parameters for these traits applying REML procedures under sire model.
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- Copyright © The British Society of Animal Science 2002