The period of the follicular phase during which the uterus of mares shows estrus-like echotexture influences the subsequent pregnancy rate

Autor: John R. Newcombe, Juan Cuervo-Arango, C. Garcés-Narro, S. Mateu-Sánchez
Jazyk: angličtina
Rok vydání: 2016
Předmět:
Male
Time Factors
Pregnancy Rate
medicine.medical_treatment
Luteolysis
Breeding
Endometrium
0403 veterinary science
Food Animals
Pregnancy
Follicular phase
Small Animals
reproductive and urinary physiology
media_common
Ultrasonography
Reproduction
04 agricultural and veterinary sciences
medicine.anatomical_structure
Follicular Phase
lipids (amino acids
peptides
and proteins)
Female
Seasons
hormones
hormone substitutes
and hormone antagonists
Prostaglandins F
Ovulation
medicine.medical_specialty
endocrine system
040301 veterinary sciences
media_common.quotation_subject
Estrous Cycle
Estrus
Ovulation Induction
Internal medicine
medicine
Journal Article
Animals
Horses
Estrous cycle
Equine
business.industry
urogenital system
Uterus
0402 animal and dairy science
040201 dairy & animal science
Pregnancy rate
Endocrinology
Animal Science and Zoology
Ovulation induction
business
Zdroj: Theriogenology, 86(6), 1506. Elsevier
ISSN: 0093-691X
DOI: 10.1016/j.theriogenology.2016.05.009
Popis: The interval from both spontaneous and prostaglandin (PGF)-induced luteolysis to ovulation is greatly variable in mares. Several reports have shown a positive association between the length of the interval from PGF treatment to ovulation (ITO) and the subsequent pregnancy rate (PR). However, it is not known whether this association also occurs in estrous cycles with spontaneous luteolysis. The main objective of this study was to determine the effect of the duration of estrus-like echotexture of the uterus during the follicular phase on the subsequent PR in both spontaneous and PGF-induced cycles. A total of 768 estrous cycles from 325 thoroughbred mares were analyzed (401 estruses were induced with exogenous PGF and 367 cycles were not treated with PGF). The following factors were taken into account to determine the effect on PR: age of the mare, stallion, year of breeding, month of season, reproductive status of the mare, use of PGF treatment, duration of follicular phase with estrus-like echotexture, interovulatory interval (IOI; in spontaneous cycles), and ITO (in PGF-induced cycles). The age of the mare (P = 0.017), mare status (P = 0.031), the ITO (P = 0.041), and the duration of the follicular phase with estrus-like echotexture (P < 0.001) influenced the PR. The PR increased with the duration of estrus and of endometrial edema in both PGF-induced and spontaneous cycles. The correlation between the duration of endometrial edema and the IOI and ITO was positive (r = 0.5) and significant (P < 0.05).
Databáze: OpenAIRE
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