[Evaluation of variability of duration of pregnancy in mares].
Abstract: In a set of mares of English Thoroughbred horse of the Napajedla stock the gravidity length in the time period from 1880 to 1972 was evaluated. The variability of the gravidity length was evaluated in sets which were put together by combination of two age groups with a division of the studied time period into ten-year stages. Variance and sample means of the gravidity lengths in these sub-groups are significantly different in the period under study. In order to eliminate the action of non-genetic influences qualifying the variability of the gravidity length, and to increase the objectivity of their evaluation it is proposed not to calculate with absolute values of the gravidity length, but on the contrary with transformed values: (xi - x) divided by s which would be computed for corresponding year of the foaling period. Another methodical approach to exclude the variability of the gravidity length depending on seasonal influences was based on the use of correction factors which were determined for individual months of foaling, on the basis of the sinusoid form of the curve of the gravidity length in the course of the calendar year. When observing the influence of the age of sires on the gravidity length, the shortening of the gravidity length in dependence on their higher age has been suggested, however this relation was significant only sporadically. The submitted work is a part of a larger theme referring, to the reproduction of horses.
Publication Date: 1981-05-01 PubMed ID: 6791362
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- English Abstract
- Journal Article
Summary
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The research article investigates the length of pregnancy in English Thoroughbred mares from a stock in Napajedla over a period of from 1880 to 1972, with a focus on how non-genetic influences and sire’s age affect the variability.
Detailed Explanation
- The research was conducted on English Thoroughbred mares of the Napajedla stock, focusing specifically on the length of their pregnancies from the years 1880 to 1972. The lengths of gravidity or pregnancy were evaluated in different sets, each set being a combination of two age groups. These sets were divided into ten-year stages for the purposes of the study.
- The researchers found that there are significant differences in the variance and the means of gravidity lengths among the various subsets examined during the study period.
- A significant part of the study was dedicated to identifying and eliminating the impact of non-genetic influences on the variability of pregnancy length. To enhance the objectivity of their evaluation, the researchers suggested the use of transformed values: (xi – x) divided by s, or the standard deviation, for each year of the foaling period, rather than absolute values of gravidity length.
- The study also proposed a separate methodology to rule out the variation of pregnancy lengths that could be influenced by seasonal changes. They recommended using correction factors specific to individual months of foaling, which were based on the sinusoid form of the curvature realized in the course of a calendar year.
- The study also examined the possible effects the age of the sire might have on the length of the mare’s pregnancy. They speculated that as the age of the sire increases, the length of the pregnancy could potentially decrease, but also noted that this correlation was only occasionally significant.
- The research forms part of a broader study focusing on equine reproduction, hence it provides valuable insights for breeders, veterinarians, and researchers in this specialized field.
Cite This Article
APA
Dusek J, Munk Z.
(1981).
[Evaluation of variability of duration of pregnancy in mares].
Vet Med (Praha), 26(5), 297-304.
Publication
Researcher Affiliations
MeSH Terms
- Age Factors
- Animals
- Female
- Horses / physiology
- Pregnancy
- Pregnancy, Animal
- Time Factors
Citations
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