Female nutria fertility of different genotypes during three estral cycles
2000
Barta, M. (Slovenska Polnohospodarska Univ., Nitra (Slovak Republic). Katedra Hydinarstva a Malych Hospodarskych Zvierat)
The reproduction characteristics of standard, Gronland and silver nutrias were studied during three estral cycles, with reference to a number of youngs born in successive litters. The average number of younglings of the given nutria genotypes born during these cycles was in a range of 4.20 to 6.80 pcs. A relatively high outage of females from the regular reproduction process was observed already in litter 3. The mean number of youngs borner litte lifters ranged from 4.73 to 6.03 pcs. At the same time, a high dispersion was observed for a number of born youngs in individual lifters, ranging from 1 to 9 pcs. No significant differences in the number of born youngs were detected among and between the genotypes of nutrias. However, there were significant differences in the number of younglings between litter 2 and litter 3, the latter exhibiting a higher number. Also, a significant interaction of genotype and litter order was noted for the fertility of nutrias
显示更多 [+] 显示较少 [-]