Nutria fertility of chosen genotypes in farm breeding in Slovakia
2002
Mertin, D. | Hanusova, J. | Flak, P. (Vyskumny Ustav Zivocisnej Vyroby, Nitra (Slovak Republic))
The aim of this work was to study the litter size of primiparous nutria females of different genotypes under conditions of farm breeding in west Slovakia over four years (1995-1998). The average number of offspring in the first litter ranged from 3.27 to 5.55. The biggest litter size was observed for Greenland and the lowest for silver nutrias. Out of the total number of fertile standard and Greenland females, 40.8% and 40.2%, respectively gave the birth to 5 young animals per litter. As far as silver females and crosses are concerned, most females (41.1% and 40.6%, respectively produced 4 young per litter. A comparison of frequencies of litter size occurrence among the studied genotypes showed the genetic determination of this parameter. The average litter size of primiparous female nutrias in farm conditions was 4.53 + 0.09 young. Based on these results, it can be concluded that the fertility of nutrias is highly significantly influenced by genotype, breeding, and year
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