Factors influencing ovarian activity and sexual behavior of postpartum mares under farm conditions

Nagy, P.; Huszenicza, G.; Juhász, Judit; Kulcsár, Margit; Solti, L.; Reiczigel, Jenő; Abaváry, K

doi:10.1016/s0093-691x(98)00212-x

Cited by 33 publications

(25 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Postpartum anoestrus and delays on postpartum ovulation occur more frequently in the beginning of the breeding season, namely, during winter days. Possibly these conditions are due to a combined effect of low luminosity, reduced body condition, age and lactation stress (Dael and Hughes, 1993;Nagy et al, 1997). The incidence of the above mentioned postpartum complications may be decreased by using an artificial photoperiod for pregnant mares (Hodge et al, 1982;Palmer and Driancourt, 1983;Witkowski andTishner, 1998).…”

Section: Discussionmentioning

confidence: 99%

“…Comparing only those mares that presented corporeal condition 4 at parturition, the reduced parturition-ovulation interval in mares that were submitted to a minimum of 30 days of artificial light was again observed. According to Nagy et al (1997) in good handling conditions there is a permanent worry to improve and maintain mares at a good body condition after parturition, so that the body condition should not have a major effect on the postpartum breeding performance. In keeping with our results, the authors observed only on slimmer mares an increased postpartum anoestrus and longer parturition-ovulation interval.…”

Section: Intervall Zwischen Geburt Und Der Ersten Postpartalen Ovulatmentioning

confidence: 99%

“…Other authors reported smaller rates of ovarian inactivity, together with a larger time interval between the first and the second postpartum ovulations in mares that foaled during winter, in relation to those that foaled during spring and summer (Loy, 1980;Witowski and Tishner, 1998). Apparently, anoestrus and changes in the parturition-ovulation interval are influenced mainly by photoperiod and by body condition (Ginther, 1992;Hines et al, 1987), being also affected by handling and specific characteristics of the year (Nagy et al, 1997). A relation between postpartum anoestrus and lactation has not been established yet, making the term "lactational anoestrus" inappropriate (Ginther, 1992;Dael and Hughes, 1993;Nagy, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…Apparently, anoestrus and changes in the parturition-ovulation interval are influenced mainly by photoperiod and by body condition (Ginther, 1992;Hines et al, 1987), being also affected by handling and specific characteristics of the year (Nagy et al, 1997). A relation between postpartum anoestrus and lactation has not been established yet, making the term "lactational anoestrus" inappropriate (Ginther, 1992;Dael and Hughes, 1993;Nagy, 1997). The use of an artificial photoperiod during the months that precede delivery may reduce the incidence of postpartum anoestrus (Palmer and Driancourt, 1983) and may shorten the parturition-ovulation interval in mares foaling during the first months in the Thoroughbred official breeding season (Witowski and Tishner, 1998).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Artificial photoperiod in pregnant mares and its effect on pregnancy length and postpartum reproductive performance

Malschitzky¹,

Schilela²,

Meirelles³

et al. 2001

PHK

View full text Add to dashboard Cite

SummaryThe aim of the present study was to evaluate the effect of prepartum artificial photoperiod on pregnancy length and reproductive performance in mares. The study included 145 Thoroughbred mares with age between 4 and 23 years. The mares were submitted to a 15 hour light/9 hour dark photoperiod/day (10W/m 2 ) during different lengths of time before foaling, constituting the following groups: <30: less than 30 days of artificial photoperiod; 30-45: from 30 to 45 days of artificial photoperiod; 46-60: from 46 to 60 days of artificial photoperiod; >60: more than 60 days of artificial photoperiod. In the moment of delivery, mares were classified according to body condition score (crescent range from 1 to 5) and, when necessary, submitted to surgical repair of the vulva within 30 minutes. Mating occurred when a follicle larger than 40 mm was detected, associated with decrease of uterine edema. Twin pregnancies were reduced manually. The number of days in which mares were submitted to artificial photoperiod influenced significantly the anoestrus rate postpartum (p=0.033), as well as the interval between parturition and the first ovulation (p=0.019). Mares submitted to a larger artificial photoperiod showed anoestrus postpartum rate significantly smaller than that observed in mares submitted to artificial photoperiod of less than 30 days (>60 -0%; <30 -16.7%). Parturition-ovulation interval was significantly shorter in mares submitted to artificial photoperiod for more than 30 days (p<0.001). Body condition was influenced by photoperiod. Treatment groups submitted to artificial photoperiod for more than 45 days presented better body condition than that submitted for less than 30 days. The body condition influenced anoestrus postpartum rate (p=0.07) and parturition-ovulation interval (p=0.073). Comparing only mares with body condition score 4 (n=81), a reduction in parturition-ovulation interval in mares submitted to a longer artificial photoperiod was seen (p=0.072). Pregnancy length was not influenced (p=0.077) by the length of photoperiod. There was no influence either on pregnancy rate in foal heat (p>0.1), or on embryo death rate (p>0.1), or on number of cycles per pregnancy rate (p=0.798). It was concluded that the use of a 15-hour light/9 hour dark photoperiod/day (10W/m 2 ) during at least 60 days before delivery decreases significantly the incidence of anoestrus postpartum. The use of this photoperiod for more than 30 days decreases parturition-ovulation interval. There is no influence either on pregnancy rate during foal heat, or on embryo death rate, or on number of cycles per pregnancy. Keywords:equine, artificial photoperiod, postpartum, body condition Einfluss eines künstlichen Lichtregimes auf die Gestationsdauer und den postpartalen Reproduktionserfolg bei Stuten

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Intervall Zwischen Geburt Und Der Ersten Postpartalen Ovulatmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Artificial photoperiod in pregnant mares and its effect on pregnancy length and postpartum reproductive performance

Malschitzky¹,

Schilela²,

Meirelles³

et al. 2001

PHK

View full text Add to dashboard Cite

show abstract

“…Portanto, o manejo no período pós-parto é um dos fatores de grande importância em uma criação. Nagy et al (1998) acompanharam cinco plantéis, durante duas estações de monta consecutivas, e constataram uma tendência, das éguas com perda da condição corporal pós-parto, apresentarem um maior intervalo entre a primeira e segunda ovulações pós-parto (p= 0,069) e uma duração mais longa da fase folicular no segundo ciclo estral (p= 0,089).…”

Section: Condição Corporal E Eficiência Reprodutivaunclassified

Condição corporal e atividade reprodutiva de eguas

et al. 2014

View full text Add to dashboard Cite

A manutenção dos animais em boa condição corporal é de grande importância para se alcançar altos índices reprodutivos, tanto à monta natural quanto frente às modernas biotecnologias da reprodução equina. A presente revisão de literatura teve como objetivo abordar a influência da condição corporal sobre a atividade reprodutiva de éguas, enfocando a atividade ovariana, o perfil endócrino, sendo dada ênfase à leptina, pois seus níveis estão diretamente relacionados à condição corporal e envolvidos no estímulo do eixo hipotálamo-hipófise-gônadas, e os índices de eficiência reprodutiva. Considerando uma escala de escore da condição corporal (1 a 9), éguas com escore > 5 são consideradas aptas a apresentarem índices de eficiência reprodutiva satisfatórios. Em síntese, a condição corporal exerce efeito sobre: a duração do anestro estacional e do período interovulatório, a secreção de IGF-1 e leptina, o número de ciclos/concepção, as taxas de prenhez, perda embrionária precoce e aborto. SUMMARYKeeping animals in good body condition is of great importance to achieve high reproductive rates, both the natural mating as the face of modern biotechnologies equine reproduction. This literature review aimed to evaluate the influence of body condition on reproductive activity in mares, focusing on ovarian activity, the endocrine profile, with an emphasis on leptin, because their levels are directly related to body condition and involved in stimulating hypothalamic-pituitary -gonadal axis, and the indices of reproductive efficiency.Considering a range of body condition score (1-9), mares with scores >5 are considered able to submit satisfactory levels of reproductive efficiency. Additionally, the body condition has an effect on the duration of seasonal anestrus, the interovulatory period, the secretion of IGF-1 and leptin, the number of cycles/conception, the pregnancy rates, early embryonic loss and abortion. INTRODUÇÃOEm um programa reprodutivo de equinos espera-se o nascimento de um potro saudável por égua, dentro do intervalo de um ano. Para isso, é necessário que se tenha éguas e garanhões de boa fertilidade, além de manejos reprodutivo, nutricional e sanitário adequados.Para a avaliação da fertilidade são adotados índices de eficiência reprodutiva, que refletem a fertilidade tanto individual como do plantel. Vários estudos vêm sendo realizados visando o aumento da eficiência reprodutiva das éguas, alguns deles com o uso de fármacos (Thompson e Witherspoon, 1974;Alcântara et al., 2005;Meyers-Brown et al., 2013) e de biotecnologias avançadas da reprodução equina (Coutinho da Silva et al., 2004;Meyers-Brown et al., 2011;Nagao et al., 2012

show abstract

Dominant follicle and gonadotropin dynamics before ovulation in postpartum lactating mares

Gastal

Pastorello

Godoi

et al. 2022

Molecular Reproduction Devel

View full text Add to dashboard Cite

The aim of this study was to compare the dominant follicle (DF) and gonadotropin dynamics for 9 days before ovulation in postpartum lactating (PP Lactating) versus non-postpartum cycling (N-PP Cycling) mares. Every PP Lactating mare on the day of parturition was paired with a N-PP Cycling mare, and the data analyses considered the partum-ovulation interval (POI) and the postpartum interovulatory interval (PPIOI) in PP Lactating mares and two interovulatory intervals in N-PP Cycling mares. The results of the present study revealed several novel and unique aspects of DF development and FSH and LH dynamics before ovulation in PP Lactating mares when compared with N-PP Cycling mares. The most remarkable differences between both groups of mares were the following: (1) a shorter interval to ovulation in PP Lactating mares during the foal heat (POI ≤22 days) compared with all other intervals; (2) a larger DF in PP Lactating mares, and an earlier day of DF at maximum diameter during the foal heat; and (3) lower gonadotropin levels in PP Lactating mares. Regarding the particularities, PP Lactating mares had lower LH levels during the POI than the PPIOI, demonstrating a strong partum effect; spring-foaled mares had longer POIs, larger DF diameters, and lower LH levels; and lower body condition scores and higher body-weight loss led to longer POIs and smaller DF diameters in PP Lactating mares. This study contributes to a broad understanding of ovarian function in the postpartum mare.

show abstract

Factors influencing ovarian activity and sexual behavior of postpartum mares under farm conditions

Cited by 33 publications

References 10 publications

Artificial photoperiod in pregnant mares and its effect on pregnancy length and postpartum reproductive performance

Artificial photoperiod in pregnant mares and its effect on pregnancy length and postpartum reproductive performance

Condição corporal e atividade reprodutiva de eguas

Dominant follicle and gonadotropin dynamics before ovulation in postpartum lactating mares

Contact Info

Product

Resources

About