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Reproductive deficiency in bulls from synthetic breeds according to the type of crossbreed and the morphology of the Y chromosome Genet. Mol. Biol.
Horn,Marilise M.; Moraes,José C.F.; Jaume,Carlos M.; Edelweiss,Maria I.A.; Rosado,Adriano.
We used 550 Braford and 214 Brangus-Ibagé 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...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bulls; Semen quality; Y chromosome; Synthetic breeds of cattle.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000200008
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