Produção Nacional
Estudo prospectivo dos efeitos da translocação Robertsoniana 1/29 sobre a fertilidade de machos Marchigiana
1989; Volume: 26; Issue: 1 Linguagem: Inglês
10.11606/issn.2318-3659.v26i1p111-120
ISSN2318-3659
AutoresRita de Cássia Stocco, Ioshihiro Ohtsubo, Janete Walter Moura, Nelson H. C. Castro, Valquíria Hyppólito Barnabé, José Antônio Visitin, Clóvis de Araújo Peres, Willy Beçak,
Tópico(s)Plant and animal studies
ResumoThe effects of the 1/29 transIocation on fertility of Marchigiana males were investigated on a prospective study. We have compared normal Nelore females artificially inseminated by an heterozygote Marchigiana sire (experimental group) with those resulting from a normal male insemination (control group). We could observe: 1. Higher mean number of A.I. I conception in the experimental group; 2. Significant reduction of pregnant females at first service, in the experimental group; 3. No difference in the period between the A.I.(s) or in obortion rates, in both groups; 4. F1 obtained from experimental group were analysed and the 1/29 distribution does nor differ from 1:1. The reduction of fertility may be due to zygotic loss and/or production of aneuploidy gametes. We have performed a meiotic and spermatic study in two heterozygote 1/29 translocated males resulting from Marchigiana x Nelore crossbreed. We found alterations in the spermatic characteristics of the heterozygote, mainly reduction of sperm concentration/mm3. Meiotic analysis of a translocated male shows no association between any autosome and the sex vesicle
Referência(s)