Litter parameters and spontaneous abnormalities in Himalayan rabbits

Area of Science:

• Veterinary Science
• Animal Reproduction
• Comparative Mammalian Biology

Background:

• Establishing baseline reproductive parameters is crucial for animal models.
• Himalayan rabbits are a common strain used in research settings.
• Understanding strain-specific reproductive data aids in interpreting experimental outcomes.

Purpose of the Study:

• To document cumulative reproductive background data for Himalayan rabbits.
• To provide reference values for conception rates, litter size, and fetal development.
• To identify the incidence of malformations and variations in this rabbit strain.

Main Methods:

• A multi-facility study involving control does of Himalayan rabbits.
• Collection and analysis of reproductive parameters including corpora lutea, implantation sites, and viable fetuses.
• Documentation of fetal malformations and variations.

Main Results:

• High conception rates were observed, ranging from 84.0% to 95.1%.
• Average corpora lutea (7.9–8.7), implantation sites (6.5–7.5), and viable fetuses (5.8–6.9) were lower than many other rabbit strains.
• A total of 1.12% malformed fetuses and 5.27% fetuses with variations were recorded among 8,060 viable fetuses.

Conclusions:

• Himalayan rabbits exhibit robust conception rates but potentially lower litter productivity.
• The observed incidence of fetal malformations and variations provides essential background data for this strain.
• These findings are vital for researchers utilizing Himalayan rabbits in experimental studies.