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Post-insemination level of feeding does not influence embryonic survival and growth in highly prolific gilts

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This study was designed to investigate the influence of a high level of feeding during early gestation on embryonic survival and variability of embryonic development in hyperprolific LW gilts. During the 7 days after the first insemination, gilts were fed either 4 or 2 kg daily of a gestation diet (groups High, n = 15, and Control, n = 13, respectively).

Gilts were slaughtered at 27.0 ± 0.1 days of pregnancy. Embryonic survival was 85.4 ± 1.0% and the number of surviving embryos averaged 17.5 ± 0.6.
2010

New application of imaging techniques in pig reproduction : from research to farm management

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In pig as in other species, ultrasonography is generally the preferred gold standard imaging technique, mainly because of its low cost and lack of side effects. It is now implemented in more than 80% of french pig farms. Although pregnancy diagnosis is still the most frequent use, various applications are found in reproduction studies: evaluation of ovarian, uterine or genital disorders, prediction of ovulation, puberty diagnosis, evaluation of bladder or mammary infections, evaluation of embryos and fetal welfare, in vivo measurement of back fat or muscle depth ….
PDF icon New application of imaging techniques in pig reproduction : from research to farm management
2010

Dietary intake during early pregnancy does not influence embryonic survival and variability in gilts

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A high level of feeding during early pregnancy has been associated with a reduction in embryonic survival in some studies, which may result in reduced litter size in moderately prolific sows. In highly prolific sows, embryonic survival is generally not a limiting factor for litter size. Furthermore, high embryonic survival reported in hyperprolific sows results in uterine crowding and an increased risk of intrauterine growth retardation. Moreover, a good embryonic survival rate has been associated with greater variability in embryo development.
PDF icon Dietary intake during early pregnancy does not influence embryonic survival and variability in gilts
2009

Ultrasonographic counting of swine embryos

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Detection of large litters and the progession of normal gestation may improve economic efficiency in pig farms. This implies early detection of the number of viable fetuses. Despite great technical improvement in echography, literature on this topic is scarce, with no practical conclusions. The objective of the present study was to assess the accuracy of in vivo embryo counting using 2 different devices at 2 different stages of pregnancy.
PDF icon Ultrasonographic counting of swine embryos
2009

Les variations saisonnières des performances de reproduction chez la truie

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Bien que la truie ne connaisse pas d’anoestrus saisonnier, une diminution des performances de reproduction est observée en été et au début de l’automne dans de nombreux pays. La proportion de truies qui tardent à revenir en oestrus après le tarissement augmente tandis que la proportion de truies inséminées qui mettent bas baisse de 5 à 15 %. Ces échecs de gestation sont liés, pour une grande part, à des avortements.

Cette baisse des performances peut s’accompagner d’un taux de réforme accru, notamment chez les jeunes femelles.
2005