|Título||Reproductive deficiency in bulls from synthetic breeds according to the type of crossbreed and the morphology of the Y chromosome
Mesquita, Marilise Oliveira
Moraes, José Carlos Ferrugem de
Jaume, Carlos M.
Edelweiss, Maria Isabel Albano
|Abstract||We used 550 Braford and 214 Brangus-lbagé bulls to study the association between Y chromosome morphology and the evaluation of breeding-soundness, karyotyping and breeding records were used to assess Y chromosome morphology. In general, no direct association was detected between the individual type of Y chromosome and reproductive fitness as previously estimated through breeding soundness examination. The type of breeding strategy used to form the synthetic breeds was also analyzed. The Braford breed is about 3/8 Zebu (Bos taurus indicus) and 5/8 Hereford (Bos taurus taurus) but when the breeding strategy used 1/4 Zebu animals to produce Braford bulls which were 3/8 Zebu a greater percentage of the bulls had to be culled due to reproductive problems. Our study shows that certain interactions between genotypes can be detrimental to the reproductive efficiency of 3/8 Zebu animals and that breeding strategies avoiding or favoring certain genotypes can be used to reduce the percentage of bulls from synthetic breeds that are culled due to problems with semen quality.
|Contido em||Genetics and molecular biology. Ribeirão Preto. Vol. 28, no. 2 (June 2005), p. 225-229
[en] Semen quality
[en] Synthetic breeds of cattle
[en] Y chromosome
|Tipo||Artigo de periódico
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