A field study on reproductive efficiency of mares maintained predominately on native pasture

Gibbs, P.G.; Davison, Karen E.

doi:10.1016/s0737-0806(06)81449-8

Cited by 12 publications

(7 citation statements)

References 4 publications

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“…(35% more). This was in contradiction with the supposed negative effect of lactation on fertility [6][7][8]. Instead of lower pregnancy losses [6] and other fertility results [49], maiden mares appeared as significantly lower reproducers (21% less than barren mares).…”

Section: Resultsmentioning

confidence: 71%

Statistical analysis of some factors affecting the number of horse births in France

Langlois

Blouin

2004

Reprod. Nutr. Dev.

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-Declarations of matings (535 746) and 308 549 consecutive declarations of birth from 1989 to 1999 were analysed by logistic regression in order to determine the effects of year, breed and age of parents on numerical productivity (the number of foals declared per mated mare per year). For the years 1994 to 1999, the status of the mare, type of mating and month of first mating, were also available. The effect of inbreeding and, for warm-blooded horses, the effect of the level of performances or the effect of the level of breeding value estimation were also analysed. The main results are the following: numerical productivity progressed in France more for draught breeds than for saddle breeds and trotters. Thoroughbreds progressed less and just reached the level of significance. Cold-blooded horses, however, appeared less productive than warm-blooded horses for which thoroughbreds were at the lower level. It cannot be concluded if this figure reveals biological differences in fertility or if it is only the result of differences in managing the official declarations. For warm-blooded horses, the absence of negative relationships between the trends of selection and numerical productivity results appeared clearly. A high performance level for the mare was positively associated with higher productivity results in sport and trotting horses and showed no significant influence for galloping horses. The relationships with breeding value estimation illustrated the same trends.horse / fertility / logistic model / factors of variation / selection / inbreeding

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Section: Resultsmentioning

confidence: 71%

Statistical analysis of some factors affecting the number of horse births in France

Langlois

Blouin

2004

Reprod. Nutr. Dev.

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“…Data obtained from a field study with 145 mares under native range conditions and with only limited supplemental feeding, indicate that lactating mares in moderate body condition (<5, 1-9 scale) tended to skip a breeding season (Gibbs & Davison, 1992). Mares under a restricted feeding level presented a winter ovarian inactivity systematically advanced, longer and finishing later than well-fed mares (Guillaume et al, 2002).…”

Section: Effects Of Body Condition On Reproductive/productive Performmentioning

confidence: 99%

Growth and Development of the Lusitano Foal on Extensive Systems

Fradinho

2020

Advances in Animal Health, Medicine and Production

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vi concretização de uma parte deste trabalho. Um agradecimento muito especial à Doutora Ana Catarina Vale, também do IST, por todo o envolvimento e colaboração nestes ensaios. Ao Dr. Nuno Bernardes, pela amizade e disponibilidade que sempre teve para nos acompanhar ao longo destes anos. Obrigada por todo o envolvimento nos trabalhos relativos à qualidade do osso (desde o campo até ao corte do "dito"), pelos RX e sua interpretação e pela revisão dos aspectos mais específicos relacionados com os problemas osteoarticulares. Às entidades e coudelarias que facultaram as suas instalações e efectivos. Este trabalho só foi possível graças ao seu envolvimento e colaboração:  Ao ex-Serviço Nacional Coudélico, na pessoa do seu Director à época, Dr. Costa Ferreira, o qual permitiu a inclusão da equipa da FMV no projecto POCI;  À Coudelaria de Alter, posteriormente incluída na ex-Fundação Alter Real, nas pessoas do seu Presidente Engº Vítor Barros e da sua Directora Dra. Idalina Trindade. Em particular, gostaria de agradecer a toda a equipa da Coudelaria de Alter que nos acompanhou e recebeu nos dias de trabalho de campo. À Dra. Maria José Correia, pelo seu empenho e pela sua boa disposição. Obrigada Zézinha, pela invulgar disponibilidade e pela franca amizade! Aos restantes ajudantes, Dra. Madalena Roquette, Sr. Ricardo Antunes, Sr. António Gomes e Sr. Ricardo Vicente, o meu sincero agradecimento;  À Coudelaria Nacional, posteriormente também integrada na ex-Fundação Alter Real, um agradecimento a todos os que de alguma forma colaboraram neste trabalho. Ao Dr. Mário Barbosa, ao Engº Francisco Beja ("dividido" depois também com a Coudelaria de Alter), ao Dr. Ricardo Agrícola, ao Dr. Vitor Grácio, ao Sr. João Francisco Gonçalves, ao Sr. João Fandinga, ao Sr. Lucílio Almeida e ao Sr. Manuel Pechorro (em memória);  Ao Sr. José Manuel de Mello (em memória), pelo pronto acolhimento e pelo entusiasmo com que recebeu este projecto na Coudelaria do Monte da Ravasqueira. Infelizmente a sua perda prematura não permitiu que pudéssemos seguir os seus animais para além de um primeiro ano. Um agradecimento especial a toda a equipa que nos acompanhou na Coudelaria, a Dra. Maria José Vila-Viçosa, o Sr. Júlio Jarego da Fonseca e o Sr. Mariano;  Ao Engº Manuel Campilho e ao seu filho Diogo Campilho, pelo pronto acolhimento deste projecto na Quinta da Lagoalva de Cima, pelo interesse e pela disponibilidade sempre demonstrados. Um agradecimento especial à restante equipa que nos acompanhou, ao Dr. Miguel Bliebernicht, ao Sr. António Rosa e ao Sr. Luís Mira (obrigada pelo contacto com os vossos cavalos de atrelagem e também pelos ensinamentos relativos a esta disciplina);  À Companhia das Lezírias, nas pessoas do seu Presidente à época, Engº Vítor Barros e da sua Administradora Dra. Ana Teresa Caseiro. Mais recentemente, um agradecimento muito especial ao seu actual Presidente, Engº António Saraiva, pelo seu interesse e incentivo. Em particular gostaria de agradecer a todos os que estiveram envolvidos no trabalho de campo, pela ajuda e pela...

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“…The few existing studies that consider maternal parity on fertility effects are controversial. While some found that parity did not affect fertility [21][22][23][24][25][26][27], others reported that mares that have never foaled have reduced embryo and fetal mortality compared to mares that previously foaled [27][28][29][30][31][32][33]. Confounding effects of maternal parity and age is probably the source of those discrepancies.…”

Section: Introductionmentioning

confidence: 99%

Nulliparity affects the expression of a limited number of genes and pathways in Day 8 equine embryos

Derisoud

Jouneau

Archilla

et al. 2022

Preprint

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Nulliparous mares produce lighter and smaller foals compared to mares having previously foaled, with effects observed at least until 4 months of age. The need for a first gestation priming for the uterus to reach its full capacity has been proposed to explain this observation. Embryo developmental defects could be hypothesized but effects of maternal parity on the embryo have only been described once, in old mares, thus combining effects of parity and old age. The aim of this study was to determine effects of mare parity on embryo gene expression. Day-8 post ovulation blastocysts were collected from young (5/6 years old) nulliparous (YN, N=6) or multiparous (YM, N=4) non-nursing Saddlebred mares, inseminated with the semen of one stallion. Pure (TE_part) or inner-cell-mass-enriched (ICMandTE) trophoblast were obtained by embryo bisection for RNA sequencing (paired end, non-oriented, Illumina, NextSeq500). Deconvolution was performed on the ICMandTE dataset. Differential expression, with embryo sex and diameter as cofactors and gene set enrichment analysis (GO BP, KEGG, REACTOME databases) were performed using a false discovery rate <0.05 cutoff. Only a few genes were altered (ICM: n=18; TE: n=6) but several gene sets were perturbed (ICM: n=62; TE: n=50) by maternal parity. In YM, only pathways related to transcription, RNA processing and vesicle transport functions were enriched in the ICM whereas only pathways related to RNA localization were enriched in TE. In YN, while only gene sets related to ribosomes and extracellular matrix were enriched in the ICM, functions related to energy and lipid metabolism, lipid transport and interleukin-1 signaling were enriched in the TE. In conclusion, several genes and pathways are affected in embryos collected from nulliparous mares, with different effects on TE and ICM. Embryo development is altered in nulliparous mares, which could partially explain the term phenotype. Whether differences in gene expression result/induce poor embryo-maternal communication remains to be determined.

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A field study on reproductive efficiency of mares maintained predominately on native pasture

Cited by 12 publications

References 4 publications

Statistical analysis of some factors affecting the number of horse births in France

Statistical analysis of some factors affecting the number of horse births in France

Growth and Development of the Lusitano Foal on Extensive Systems

Nulliparity affects the expression of a limited number of genes and pathways in Day 8 equine embryos

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