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Table 7. When different breeds are mated the crossbred progeny are less inbred than their parents. Cows are usually selected for moderate frame, good milking and mothering ability. Reduction of fertility. Moreover, the molecular analysis of genetic markers, e.

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This demonstrates the very large potential benefits of crossbreeding in cow-calf production.

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The first step of DSD diagnosis, following clinical investigation, should be cytogenetic analysis focused on the identification of sex chromosomes. Among them, fluorescence in situ hybridization, besides chromosome banding, has become a gold standard. Robertsonian translocation. This study strongly confirmed that X monosomy is the most important cause of equine DSD. Reciprocal translocations are the most common chromosome rearrangements in pigs. The frequency of freemartinism depends on the incidence of twin multiple pregnancies associated with the development of placental anastomoses between embryos.

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