Factors Influencing the Frequency of Pregnancy Loss among Thoroughbred Mares in Hidaka, Japan

Miyakoshi, Daisuke; Shikichi, Mitsumori; Ito, Katsuhiko; Iwata, Katsuroku; Okai, Kazuhiko; Sato, Fumio; Nambo, Yasuo

doi:10.1016/j.jevs.2012.01.003

Cited by 15 publications

(31 citation statements)

References 23 publications

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“…Além disso, a taxa de aborto, avaliada aos 90 dias de gestação, também apresentou diferença significativa entre os grupos, sendo esta maior quando ECC<5 (75 % vs. 0 %, respectivamente; Henneke et al,1984) Miyakoshi et al (2012) demostraram, com avaliação realizada aos 35 dias de gestação, diferença significativa na taxa de perda embrionária precoce, sendo esta maior quando as éguas estavam com ECC < 5 (11,8 % vs. 3,8 %), e, da mesma forma, também apresentaram maior taxa de aborto (23,4 % vs. 7,6 %).…”

Section: Condição Corporal E Eficiência Reprodutivaunclassified

Condição corporal e atividade reprodutiva de eguas

et al. 2014

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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

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Section: Condição Corporal E Eficiência Reprodutivaunclassified

Condição corporal e atividade reprodutiva de eguas

et al. 2014

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“…Numerous studies have shown that the majority of losses of thoroughbred pregnancies occur in the embryonic and early fetal period [1][2][3]. Pregnancy losses have significant implications in terms of economics, time and mare and stallion welfare [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…There is, however, a clear association between mare age and status with maiden mares principally being the youngest members of the cohort. Conflicting results have been found in relation to foaling to covering period and uterine cysts [2,9,10]. Whilst the contribution of a range of reproductive therapies on various aspects of reproductive efficiency have been measured [7,11,12] there is little work investigating their impact on EPL.…”

Section: Introductionmentioning

confidence: 99%

“…These studies looked at pregnancy rates, mating to conception times and pregnancy loss overall (day 15 to term) but did not investigate factors specifically influencing EPL. A 2011 study of 1476 Japanese thoroughbreds did use multivariable analysis to investigate factors associated with losses up to day 35 of pregnancy [2]. They found foal heat mating and the presence of uterine cysts to contribute to the incidence of EPL (defined as loss from gestational day [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

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Multivariable analysis to determine risk factors associated with early pregnancy loss in thoroughbred broodmares

et al. 2019

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“…There have been a number of studies which have sought to explain an unusually high incidence of fetal loss in domestic horses reaching up to 40% [4][5][6][7][8][9][10][11][12][13][14]. However, these studies, as well as many breeders and veterinarians, neglect other factors associated with reproductive fitness and female reproductive strategies across species [e. g., [15]] One of those neglected factors may be sexual conflict, a conflict between the evolutionary interests of individuals of the two sexes [16], broadly investigated in behavioral ecology and sociobiology [15].…”

Section: Introductionmentioning

confidence: 99%

Behavioral Factors Affecting Reproduction in Domestic Horses: Sociobiological Approach

Bartoš¹,

Bartošová²,

Pluháček³

2019

Animal Genetics - Approaches and Limitations

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Fetal loss is a common phenomenon in domestic horses, being usually highest (up to 40%) of all domestic ungulates. However, in all studies investigating this problem, sociobiological approach, such as conflict between the evolutionary interests of individuals of the two sexes, has been neglected. Here we summarize results of three consecutive studies considering infanticide as a male's reproductive strategy and a mare's counter strategies against it. When a mare was either artificially inseminated or removed from her home environment and transported elsewhere for mating and then returned back into her home environment, containing a stallion (and/or gelding) who did not sire her fetus, she got into a potentially infanticidal danger. She more likely disrupted her pregnancy than a mare living in an environment with the sire of her fetus. This was highly affected by the social environment. Lowest percentage of pregnancy disruption can be achieved when the pregnant mare was released into an enclosure shared with the non-sire male whom she can "convince" he is the father of her expected foal by promiscuous mating. The effects of social environment leading to pregnancy block and/or disruption may thus explain substantial part of the high incidence of domestic horse fetal loss.

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Factors Influencing the Frequency of Pregnancy Loss among Thoroughbred Mares in Hidaka, Japan

Cited by 15 publications

References 23 publications

Condição corporal e atividade reprodutiva de eguas

Condição corporal e atividade reprodutiva de eguas

Multivariable analysis to determine risk factors associated with early pregnancy loss in thoroughbred broodmares

Behavioral Factors Affecting Reproduction in Domestic Horses: Sociobiological Approach

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