[Length of gestation of Freiberger mares with mule and horse foals].

The research study examines and compares the gestation lengths of two groups of Freiberger mares, one group bred by a donkey (resulting in mule foals), and the other bred by a stallion of the same breed (resulting in horse foals). The study found significant differences in gestation periods, influenced by factors such as time of breeding and the mare herself.

Objective of the Study

• This research aimed to compare the gestation periods of Freiberger mares that were either bred by a donkey, resulting in mule foals, or by a stallion of the same breed, yielding horse foals. The study sought to identify if there were significant differences in the gestation lengths of these two groups, and if these differences were influenced by factors like the stallion, the mare, the age of the mare, the sex of the foal, and the timing of mating during the breeding season.

Method and Organization of the Study

• The researchers conducted a retrospective study where they analyzed two groups of Freiberger mares, each group comprising 193 mares.
• The first group of mares were bred by a donkey, while the second group was bred by a Freiberger stallion.
• The research team then compared the average gestation lengths for both groups of mares, noting down the shortest and longest observed gestation lengths for both groups.

Key Findings of the Study

• The results indicated that on average, the gestation length for mares with Freiberger foals was 336.5 days, whereas for mares with mule foals it was longer at 343.1 days.
• The difference in gestation lengths between both groups was statistically significant (p < 0.001).
• The gestation length of mares with Freiberger foals ranged between 307 and 361 days, while for mares with mule foals it was between 315 and 369 days.
• The study also found that the time of breeding and the mare significantly influenced the gestation length (p < 0.05), although it remains unclear from the abstract alone whether these factors had similar effects on both groups of mares or if their impact varied.