The polymorphism of blood proteins in cattle may be an indicator of certain physiological and genetical changes occurring in cattle population. A s h t o n et al. (1), S z a p i r o (10), W h i t e et al. (12) demonstrated, that cows with the Tf/TfD genotype were charakterised by a greater productivity than those with the Tf/Tf genotype. A s h t o n and F a l l o n (2) indicated a connection between the transferrin genes and the fertility of cows. Many authors have observed changes in the frequency of the Tf allele, depending on the degree of selection. Thus, for instance, O s t e r - h o f f (8) demonstrated an increase in the frequency of the T f allele with the age of cows. A similar result was obtained by G e l d e r m a n n ( 6 ) as regards the Tf2 allele; Bush (3) recorded, that in the first three lactations he found 5 transferrin phenotypes (AA, AD, AE, DD and DE), but in cows during the 4 and 5 lactation only three. However, a series of authors have failed to confirm in their works the dependence between the productivity or fertility of cows and the type of transferrins (4, 5, 7).
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 3, Madrid, Spain, 235–240, 1974
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