Publications by authors named "Juliette Auclair-Ronzaud"
Chicory (Cichorium intybus) reduces cyathostomin egg excretion and larval development in grazing horses.
Int J Parasitol Drugs Drug Resist
April 2024
Cyathostomins are the most prevalent parasitic nematodes of grazing horses. They are responsible for colic and diarrhea in their hosts. After several decades of exposure to synthetic anthelmintics, they have evolved to become resistant to most compounds.
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- Monitoring the reproductive cycle in mares is crucial for producing one foal each year, as ovulation detection can be challenging due to varying estrus lengths.
- The study involved daily transrectal ultrasonography and blood sampling to track hormone levels and measure body temperature using an implanted sensor around ovulation.
- Results showed significant temperature increases during ovulation and early luteal phases, indicating potential for using body temperature as a method for reproduction monitoring, but further research is needed for comprehensive cycle analysis.*
Nulliparity is associated with intra-uterine growth retardation and foal delayed catch-up growth. Older mares produce larger/taller foals than the precedents. Nursing at conception on foal growth had not been investigated yet.
View Article and Find Full Text PDFEquid milk is arousing increasing interest in consumers and researchers because of its similarity in composition to human milk. The low and different protein content makes equid milk it suitable for children with cow milk protein allergy. Both horse and milk production, in many farms, still follow a characteristic and traditional method of separating the foal from the mother to allow milking procedures.
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- The study investigates how the age of the mare impacts the gene expression in equine blastocysts, revealing differences between younger (6-year-old) and older (over 10-year-old) mares.
- Results showed that while maternal age did not affect embryo recovery rates or size, it did disturb gene expression related to mitochondria and protein metabolism, particularly in the inner cell mass.
- The findings suggest that maternal aging can significantly impact embryo development and potentially contribute to reduced fertility in older mares, marking an important insight for the equine industry.
Although puberty can occur as early as 14-15months of age, depending on breed and use, the reproductive career of mares may continue to advanced ages. Once mares are used as broodmares, they will usually produce foals once a year until they become unfertile, and their productivity can be enhanced and/or prolonged through embryo technologies. There is a general consensus that old mares are less fertile, but maternal age and parity are confounding factors because nulliparous mares are usually younger and older mares are multiparous in most studies.
View Article and Find Full Text PDFGestational length is highly variable in horses ranging from 320 to 360 days. Thus, determining parturition time is an important challenge for the horse industry. Body temperature can be used in cows and ewes as an indicator of parturition.
View Article and Find Full Text PDFIn clinics, temperature is used as an indicator of health. Mostly rectal temperature is recorded, requiring handling and time. Temperature-sensitive identification microchips could be an alternative.
View Article and Find Full Text PDFPurpose: To compare the effects of 8-wk eccentric (ECC) versus concentric (CON) training using downhill and uphill running in rats on whole body composition, bone mineral density (BMD), and energy expenditure.
Methods: Animals were randomly assigned to one of the following groups: 1) control (CTRL), 2) +15% uphill-running slope (CON), 3) -15% downhill-running slope (ECC15), and 4) -30% downhill-running slope (ECC30). Those programs enabled to achieve conditions of isopower output for CON and ECC15 and of iso-oxygen uptake (V˙O2) for CON and ECC30.