Fertility at the first post partum estrous compared with fertility at the following estrous cycles in foaling mares and with fertility in nonfoaling mares

Camillo, Francesco; Marmorini, P; Romagnoli, Silvia; Vannozzi, Iacopo; Bagliacca, Marco

doi:10.1016/s0737-0806(97)80189-x

Cited by 35 publications

(27 citation statements)

References 8 publications

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“…oestrus are lower than those of mares bred in subsequent heats: 37 vs. 58% [5], 49 vs. 66% [31], 52 vs. 66% [6]. Recently, however, much higher foal heat pregnancy rates have been reported: 72% [4] and 82% [1]. Management factors such as better feeding, adequate exercise, improved hygiene, use of ultrasonography, and more advanced veterinary skills in artificial insemination, oestrus and ovulation control presumably contribute to the improved results.…”

Section: Introductionmentioning

confidence: 99%

Relationship between embryo recovery rate and uterine lavage fluid composition in postpartum mares

Reilas¹,

Huhtinen²,

Oksanen

et al. 2000

Reprod. Nutr. Dev.

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-The aim of the study was to determine whether neutrophil numbers (PMN), trypsininhibitor capacity (TIC), lysozyme, N-acetyl-β-D-glucosaminidase (NAGase), β-glucuronidase (B-Gase), total protein, and plasmin in uterine lavage fluid of postpartum (p.p.) mares, either at the time of foal heat insemination or around the time of arrival of the embryo in the uterus, could be used in predicting conception. Fifteen mares were inseminated within 13 h after the first p.p. ovulation. Uterine lavage fluids were successfully collected from 9 out of 12 mares before insemination and from all 15 mares before embryo recovery 7 to 8 days after insemination. The embryo recovery rate was 53% (8/15). Prior to insemination, PMN, TIC and lysozyme levels were elevated in 3/4 mares not producing embryos. However, only 1/5, 1/5 and 0/5 mares producing embryos had elevated levels of PMN, TIC, and lysozyme, respectively. None of the parameters was significantly different in mares with or without embryos, but lysozyme was the closest to significance (p = 0.07). In both groups of mares, activities of NAGase (p < 0.01) and B-Gase (p < 0.05) were significantly higher in dioestrus than immediately after ovulation. At embryo recovery, NAGase was higher in mares not producing embryos (p < 0.05). The results suggest that a long-lasting inflammation is the best explanation for low pregnancy rates during the first p.p. oestrus. Further research is needed to establish whether lysozyme, or possibly TIC, could be used in predicting conception at foal heat. mare / foal heat / uterine fluid / inflammation / embryo recovery Résumé -Relations entre le taux de récupération des embryons et la composition du liquide de lavage de l'utérus chez la jument lors du post-partum. Le taux de récupération des embryons a été relié à la composition du fluide utérin chez 15 juments qui ont été inséminées dans les 13 h suivant la première ovulation post-partum. Les liquides de lavage ont été récupérés avant l'insémination chez 9 juments sur 12 et chez 15 sur 15 avant la collecte des embryons 7 à 8 jours après. Les mesures ont porté sur le nombre des neutrophiles, les teneurs en plasmine et en protéines totales, la concentration en lysozyme, l'activité de l'inhibiteur de la trypsine (TIC), les activités de la N-acétyl-D-glucosaminidase (N-Gase), et de la β-glucoronidase (B-Gase). Le taux de récupération des Reprod. Nutr. Dev. 40 (2000) 383-391 383

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Section: Introductionmentioning

confidence: 99%

Relationship between embryo recovery rate and uterine lavage fluid composition in postpartum mares

Reilas¹,

Huhtinen²,

Oksanen

et al. 2000

Reprod. Nutr. Dev.

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“…In order to delay breeding until uterine involution should be complete, and to improve pregnancy rates, administration of prostaglandins, shortening the first postpartum luteal phase, has been performed (Almeida, 1995;Lowis and Hyland, 1991). It has been suggested, not to breed mares with a history of foaling complications or evidence of reproductive tract pathology, at foal heat (Camillo, 1997). Known causes of disturbance of the normal uterine involution are dystocia and retention of the placenta (Vandeplassche, 1983).…”

Section: Introductionmentioning

confidence: 99%

Retained placenta in Friesian mares: reproductive performance after foal heat breeding versus breeding in a subsequent heat

Sevinga¹,

Hesselink²,

Barkema³

2001

PHK

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SummaryPostpartum reproductive performance was studied in 54 Friesian brood mares with and 50 without retained placenta. Retained placenta was defined as failure to expel all fetal membranes within 3 hours after the delivery of the foal. The group of mares with retained placenta was subdivided into mares in which the placenta had been removed manually (n=30) and mares in which it was not (n=24). Within each group, reproductive performance after breeding in the foal heat and breeding in a subsequent heat was compared. Age of the mares, number of mares treated with antibiotics after insemination, and number of mares treated with prostaglandins were recorded. The interval between delivery and conception, efficacy rate, seasonal pregnancy rate, pregnancy rate after first insemination, pregnancy loss rate, and foaling rate did not differ between the mares with and without retained placenta or between the mares with and without manual removal of the retained placenta. Within each group, the pregnancy rate after first insemination did not differ between breeding for the first time in the foal heat and breeding for the first time in a subsequent heat. It is concluded that reproductive performance did not differ between 1) Friesian mares with and without retained placenta and, 2) Friesian mares with and without manual removal of the placenta. With regard to reproductive performance, retained placenta and manual removal of the placenta are not valid reasons to avoid foal heat breeding in Friesian mares.

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“…Além disso, para se alcançar o máximo retorno econômico em sistemas de criação, é desejável que o número de potros produzidos por égua seja maximizado. No entanto, considerando uma gestação com duração de 335-340 dias, para que se consiga a produção de um potro por ano, é necessário que a concepção ocorra em até 25-30 dias após o parto (BLANCHARD et al, 1989;CAMILLO et al, 1997). Sendo assim, os eventos reprodutivos no período pós-parto são cruciais para que o intervalo entre partos seja mantido em torno de 12 meses.…”

Section: Introductionunclassified

“…Geralmente, menores taxas de prenhez (9 a 20%) são descritas em relação à fertilidade do primeiro estro pós-parto quando comparadas à fertilidade de ciclos estrais subsequentes (LOY, 1980;KATILA 1987;OIJALA, 1988;GINTHER, 1992). No entanto, outros autores relatam taxas de prenhez similares entre os diferentes ciclos pós-parto (CAMILLO et al, 1997;MALSCHITZKY et al, 2002), entre o primeiro estro pós-parto e ciclos de éguas não gestantes GINTHER, 1991a;CAMILLO et al, 1997) ou até mesmo altas taxas de prenhez (> 80%) em éguas inseminadas no cio do potro (BRUEMMER; BRADY; BLANCHARD, 2002). Por outro lado, maior potencial para perdas gestacionais (MERKT; GÜNZEL, 1979;BONNETT;MCKEE, 1991;GINTHER, 1992;MORRIS;ALLEN, 2002) ou menores taxas de recuperação embrionária (HUHTINEN; REILAS; KATILA, 1996) tem sido atribuídas ao primeiro estro pós-parto quando comparado a ciclos de éguas não gestantes.…”

Section: Introductionunclassified

“…Apesar deste primeiro estro ser reconhecidamente fértil (NETT; ESTERGREEN, 1975;GINTHER, 1992), controvérsias existem em relação à fertilidade neste período. Geralmente, menores taxas de prenhez são descritas em éguas acasaladas no cio do potro em relação aos ciclos subsequentes (LOY, 1980;GINTHER, 1992), porém taxas de prenhez similares têm sido observadas em relação aos diferentes ciclos pós-parto (MALSCHITZKY et al, 2002) ou entre o primeiro estro pós-parto e éguas não gestantes (GRIFFIN; GINTHER, 1991a;CAMILLO et al, 1997). Adicionalmente, maior risco de perdas embrionárias (MERKT; GÜNZEL, 1979;GINTHER, 1992) ou menores taxas de recuperação embrionária (HUHTINEN; REILAS; KATILA, 1996) têm sido atribuídas ao primeiro estro pós-parto.…”

Section: Introductionunclassified

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Avaliação da dinâmica ovariana, características uterinas, fluxo sanguíneo uterino e ovariano e concentrações séricas de progesterona em éguas no período pós-parto

Lemes¹

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Avaliação da dinâmica ovariana, características uterinas, fluxosanguíneo uterino e ovariano e concentrações séricas de progesterona em éguas no período pós-parto The aim of this study was to evaluate the characteristics of ovarian dynamics, aspects of the uterine involution process and characteristics of uterine and ovarian hemodynamic during the postpartum period in mares (n = 10). Thus, the content presented in this thesis is divided into two chapters. In the first chapter, the aspects of the uterine involution process and characteristics of endometrial and mesometrial vascularization were evaluated. A rapid reduction (P<0,05) in uterine diameter was observed during the first 7 days postpartum, with subsequent decrease in the rate of uterine involution, and this process was completed in about 21 days for formerly nongravid horn (CNG) and 24 days for the formerly gravid horn (CG). For intrauterine fluid accumulations, an increase (P<0,05) was observed between days 1 and 2 postpartum (d1 and d2), with a significant reduction between d4 and d7, and no amount of fluid collections was observed in the animals after d16 or after the third day post-ovulation (D3). No differences (P>0,05) was observed between the uterine horns (CG and CNG) in relation to vascular perfusion characteristics. In this context, an increase (P<0,05) in the endometrial vascularity scores was observed between d1 and d4, remaining similar until d13, as well as an increase (P<0,05) in mesometrial vascularization occurred between d1 and d2. However, a reduction (P<0,05) in scores of mesometrial vasculature was observed from d2 to d10. After ovulation, an increase of endometrial vascularization was observed from D0 to D5, with reduction in scores from D5 to D11 and a further increase between D11 and D14. Similarly, the pattern of mesometrial vascularization was similar to that observed in the endometrium. In the second chapter, follicular development and vascularization were assessed during the first postpartum estrus, as well the characteristics of development and vascular perfusion of the corpus luteum (CL) and serum progesterone (P4) during the 16 days after the first postpartum ovulation.Additionally, the animals were divided into two groups: the group early (ovulation before the d10) or late (ovulation after d10). With regard to follicular development, no difference was observed between groups in days relative to the first postpartum ovulation, however, when evaluated on the day of parturition, differences were observed between groups. In this respect, the early group had a larger diameter (P<0,05) of the dominant follicle (F1) each day in the early postpartum period (d1-d7) and had a greater number of follicles (P<0,05) in the > 25 mm class during the first days postpartum (d1-d3). Additionally, the animals in the late group showed a greater number of follicles (P<0,05) in the 20-25 mm class during early postpartum period (d4-d7). Regarding the characteristics of vascular perfusion, no difference (P>0,05) was observed between groups regardin...

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Fertility at the first post partum estrous compared with fertility at the following estrous cycles in foaling mares and with fertility in nonfoaling mares

Cited by 35 publications

References 8 publications

Relationship between embryo recovery rate and uterine lavage fluid composition in postpartum mares

Relationship between embryo recovery rate and uterine lavage fluid composition in postpartum mares

Retained placenta in Friesian mares: reproductive performance after foal heat breeding versus breeding in a subsequent heat

Avaliação da dinâmica ovariana, características uterinas, fluxo sanguíneo uterino e ovariano e concentrações séricas de progesterona em éguas no período pós-parto

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