References of "Beckers, Jean-François"
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See detailAnti-mullerian hormone is an endocrine marker of ovarian gonadotropin-responsive follicles and can help to predict superovulatory responses in the cow.
Rico, Charlene; Fabre, Stephane; Medigue, Claire et al

in Biology of Reproduction (2009), 80(1), 50-59

The major limitation to the development of embryo production in cattle is the strong between-animal variability in ovulatory response to FSH-induced superovulation, mainly due to differences in ovarian ... [more ▼]

The major limitation to the development of embryo production in cattle is the strong between-animal variability in ovulatory response to FSH-induced superovulation, mainly due to differences in ovarian activity at the time of treatment. This study aimed to establish whether anti-Mullerian hormone (AMH) was an endocrine marker of follicular populations in the cow, as in human, and a possible predictor of the ovarian response to superovulation. Anti-Mullerian hormone concentrations in plasma varied 10-fold between cows before treatment and were found to be highly correlated with the numbers of 3- to 7-mm antral follicles detected by ovarian ultrasonography before treatment (r=0.79, P<0.001) and the numbers of ovulations after treatment (r=0.64, P<0.01). Between-animal differences in AMH concentrations were found to be unchanged after a 3-mo delay (r=0.87, P<0.01), indicating that AMH endocrine levels were characteristic of each animal on a long-term period. The population of healthy 3- to 7-mm follicles was the main target of superovulatory treatments, contained the highest AMH concentrations and AMH mRNA levels compared with larger follicles, and contributed importantly to AMH endocrine levels. In conclusion, AMH was found to be a reliable endocrine marker of the population of small antral gonadotropin-responsive follicles in the cow. Moreover, AMH concentrations in the plasma of individuals were indicative of their ability to respond to superovulatory treatments. [less ▲]

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See detailSerum Profiles of Pregnancy-Associated Glycoprotein, Oestrone Sulphate and Progesterone During Gestation and Some Factors Influencing the Profiles in Ethiopian Borana and Crossbred Cattle.
Lobago, F.; Bekana, M.; Gustafsson, H. et al

in Reproduction in Domestic Animals (2009), 44(4), 685-692

Contents This study presents serum concentrations of pregnancy-associated glycoprotein (PAG), oestrone sulphate (E1-S) and progesterone (P4), and the effects of some dam and foetus-related factors on ... [more ▼]

Contents This study presents serum concentrations of pregnancy-associated glycoprotein (PAG), oestrone sulphate (E1-S) and progesterone (P4), and the effects of some dam and foetus-related factors on these profiles during gestation in Borana and crossbred cattle. The PAG concentrations at 4th week post-conception ranged from 1.5-5.5 and 2.1-4.7 ng/ml in Borana (n = 6) and crossbred (n = 8) cattle, respectively. The mean PAG concentrations increased progressively from 4th to 33rd week of gestation (from 3.3-173 ng/ml for Borana and 4.2-240 ng/ml for crossbred cattle) and reached peak around calving. Breed, parity status, dam body weight, foetal sex and foetal birth weight significantly influenced the PAG concentrations. After delivery, the PAG concentrations declined steadily to 5.7 ng/ml in Borana (n = 7) and 3.9 ng/ml in crossbred (n = 6) cattle 10 weeks post-partum. The serum E1-S concentrations at 17th week of pregnancy ranged from 0.3-2.6 and 0.9-5.7 ng/ml in Borana (n = 8) and crossbred (n = 9) cattle, respectively. The mean E1-S concentrations increased progressively from 17th to 33rd week of gestation (from 1.1-4.6 ng/ml for Borana and 2.7-10.8 ng/ml for crossbred). Breed, parity status, dam body weight and foetal sex significantly influenced E1-S concentrations. The P4 concentrations at 4th week of pregnancy ranged from 3.2-5.1 and 1.7-8.9 ng/ml in Borana (n = 6) and crossbred (n = 8) cattle, respectively. The P4 level remained elevated throughout pregnancy. This study indicated that the serum PAG and P4 concentrations at 4th and E1-S approximately 17th week of pregnancy were above the cut-off value for pregnancy test and the hormonal profiles observed were comparable to the previous reports. Furthermore, the PAG and E1-S profiles were considerably influenced by factors such as breed, weight and parity status of the dam, and foetal sex and foetal birth weight (only PAG). [less ▲]

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See detailPregnancy-associated glycoproteins as diagnostic tool in cattle reproduction
Gajewski, Zdzislaw; Pertajitis; Melo de Sousa, Noelita ULg et al

in Schweizer Archiv für Tierheilkunde (2009), 151(12), 577-582

Pregnancy-associated glycoproteins are powerful pregnancy markers in domestic cattle. These proteins are expressed in mono- and binucleate trophoblast cells from the first days of gestation until calving ... [more ▼]

Pregnancy-associated glycoproteins are powerful pregnancy markers in domestic cattle. These proteins are expressed in mono- and binucleate trophoblast cells from the first days of gestation until calving. Different molecules were identified as being expressed at various stages of pregnancy. However, up to date, their functions and activities during pregnancy were not yet established. Specific RIA tests were developed (classic and alternative RIA) and used to measure the concentration of these glycoproteins in blood during gestation and the postpartum period in cattle. In maternal blood, PAGs rise to detectable levels from the 24th-28th days after fertilization. A recent study indicated that PAGs can also be detected in milk samples. However, concentrations in milk are much lower when compared to those of plasma. [less ▲]

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See detailCorrelation of five radioimmunoassay systems for measurement of bovine plasma pregnancy-associated glycoprotein concentrations at early pregnancy period.
Ayad, A.; Melo de Sousa, Noelita ULg; Sulon, Joseph ULg et al

in Research in Veterinary Science (2009), 86

The measurement of serum or plasma PAG concentrations is currently used as a specific method for pregnancy diagnosis in cattle. In this study, the correlation between five radioimmunoassay systems (RIA ... [more ▼]

The measurement of serum or plasma PAG concentrations is currently used as a specific method for pregnancy diagnosis in cattle. In this study, the correlation between five radioimmunoassay systems (RIA-497, RIA-706, RIA-780, RIA-809 and RIA-Pool) developed for measurement of PAG concentrations in ruminant species was investigated in plasma from pregnant Friesian Holstein females. Plasma PAG concentrations (ng/mL) measured by different RIA systems were significantly correlated between them ( 0.81; P<0.001). PAG concentrations increased significantly from Day 21 (n=27) to 30 (n=37) after AI by use of all PAG-RIA systems. From Day 30 to 80 after AI, lower PAG concentrations were observed when using the homologous system RIA-497. The addition of several proteinase inhibitors changed neither the non specific binding nor the B(0) binding to the tracer. Our results suggest that all tested PAG-RIA (RIA-497, RIA-706, RIA-780, RIA-809 and RIA-Pool) are highly correlated and can be useful to follow PAG concentrations in samples collected during the first trimester of gestation. [less ▲]

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See detailDetermination of sex and scrapie resistance genotype in preimplantation ovine embryos.
Guignot, F.; Baril, Gerard; Dupont, Francis et al

in Molecular Reproduction and Development (2009), 76(2), 183-190

The aim of this study was to test the accuracy of genotype diagnosis after pre-amplification of DNA extracted from biopsies obtained by microblade cutting of ovine embryos and to evaluate the viability of ... [more ▼]

The aim of this study was to test the accuracy of genotype diagnosis after pre-amplification of DNA extracted from biopsies obtained by microblade cutting of ovine embryos and to evaluate the viability of biopsied embryos after vitrification/warming and transfer to recipients. Sex and PrP genotypes were determined. Sex diagnosis was done by PCR amplification of ZFX/ZFY and SRY sequences after PEP-PCR while PrP genotype determination was performed after specific pre-amplification of specific target including codons 136, 154 and 171. Embryos were collected at Day 7 after oestrus. Blastocysts and expanded blastocysts were biopsied immediately after collection whereas compacted morulae were biopsied after 24 hr of in vitro culture. Eighty-nine biopsied embryos were frozen by vitrification. Fresh and vitrified whole embryos were kept as control. DNA of biopsies was extracted and pre-amplified. Sex diagnosis was efficient for 96.6% of biopsies and PrP genotyping was determined in 95.8% of codons. After embryo transfer, no significant difference was observed in lambing rate between biopsied, vitrified control and fresh embryos (54.5%, 60% and 66.6%, respectively). Embryo survival rate was not different between biopsied and whole vitrified embryos (P = 0.38). At birth, 96.7% of diagnosed sex and 95.4% of predetermined codons were correct. Lamb PrP profiles were in agreement with parental genotype. PEP-PCR coupled with sex diagnosis and nested PCR coupled with PrP genotype predetermination are very accurate techniques to genotype ovine embryo before transfer. These original results allow planning of selection of resistant genotype to scrapie and sex of offspring before transfer of cryopreserved embryo [less ▲]

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See detailConcentrations of pregnancy-associated glycoproteins in Water buffaloes females (Bubalus bubalis) during pregnancy and postpartum periods
Barbato, O.; Melo de Sousa, Noelita ULg; Malfatti, A. et al

in O’Leary, M.; Arnett, J. (Eds.) Pregnancy Protein Research (2009)

The concentrations of pregnancy-associated glycoproteins (PAG) were determined in buffalo cows (Bubalus bubalis) using three different radioimmunoassay (RIA) systems (RIA-497, RIA-706, and RIA-708 ... [more ▼]

The concentrations of pregnancy-associated glycoproteins (PAG) were determined in buffalo cows (Bubalus bubalis) using three different radioimmunoassay (RIA) systems (RIA-497, RIA-706, and RIA-708). Samples (10 mL) were collected by jugular venipuncture from Week 0 until Week 28 of pregnancy (9 females), and from parturition until Week 10 postpartum (13 females). During pregnancy, PAG molecules were detectable at Week 6 using the three aforementioned RIA systems (3.9 ± 1.3 ng/mL, 9.7 ± 1.3 ng/mL, and 9.9 ± 0.7 ng/mL for RIA-497, RIA-706, and RIA-708, respectively). These concentrations increased gradually until Week 28, reaching values of 39.6 ± 4.0 ng/mL (RIA-497), 50.5 ± 11.9 ng/mL (RIA-706), and 68.2 ± 20.8 ng/mL (RIA-708). PAG concentrations determined by RIA-497, RIA-706, and RIA-708 were strongly correlated throughout the entire gestation period, RIA-708 giving the higher concentrations. At parturition, the mean concentrations ranged from 34.9 ± 4.0 (RIA-497) to 84.7 ± 10.6 ng/mL (RIA-708). Thereafter, the concentrations decreased steadily, reaching very low levels (< 1.0 ng/mL) at Week 8 postpartum. In conclusion, PAG concentrations measured by the above three RIA systems showed a profile similar to those previously described in bovine species, with higher concentrations being detected by RIA-706 and RIA-708. However, the patterns of PAG concentrations, studied using the three aforementioned PAG-RIA systems, differed around parturition, with very low levels being observed in the female buffaloes [less ▲]

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See detailRecent possibilities for diagnosing early pregnancy (EP) in small ruminants and pigs.
Szenci, O; Beckers, Jean-François ULg; Taverne, M.A.M

in Reproduction in Domestic Animals (2008), 43(5), 104

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See detailIsolation of pregnancy-associated glycoproteins of the American bison (Bison bison) at first half of pregnancy
Kiewisz, J.; Melo de Sousa, Noelita ULg; Beckers, Jean-François ULg et al

in General and Comparative Endocrinology (2008), 155(1), 164-175

This paper describes the successful purification and characterisation of pregnancy-associated glycoproteins (PAG) extracted from placenta (3-4 months) of American bisons (Amb). Chorionic AmbPAG proteins ... [more ▼]

This paper describes the successful purification and characterisation of pregnancy-associated glycoproteins (PAG) extracted from placenta (3-4 months) of American bisons (Amb). Chorionic AmbPAG proteins were purified from foetal cotyledonary tissues (CT) and liquid cotyledonary-carrying proteins (LCP) leaking from damaged cells. Our protocols successfully indicated the usefulness of AmbPAG protein identification, especially from LCP fraction. The AmbPAGs were extracted, precipitated and eluted during DEAE cellulose chromatography. The richest protein fractions were further chromatographed on VVA (Vicia villosa agglutinin affinity column), then characterised by mono- and bi-dimensional electrophoresis, Western blot and N-terminal amino acid (aa) sequence. After being transferred to PVDF membranes, three selected VVA-purified AmbPAG isoforms differing in molecular masses and isoelectric points (Ip 4-4.6) were selected for sequencing. One identified N-terminal 25 aa sequence of AmbPAG72 kDa CT form was identified as completely new (RGSNI_TSLPLQNVIDLFYVGNITIG). Two other AmbPAG proteins purified from different sources (74 kDa CT and 76 kDa LCP forms; RGSNLTIHPLRNIRDIFYVGNITIG) were identical or corresponded to N-terminus of various bovine PAGs (boPAG). The two AmbPAGs (74 kDa CT and 76 kDa LCP) revealed identical micro-sequence to boPAG7; and were similar mainly to bovine PAG4, -6, -15 and -17 precursors that were identified by full-length sequencing derived from cDNA cloning. The novel sequence of the AmbPAG (72 kDa CT) was related to some boPAG and various other ruminant PAG precursors (caprine and ovine). All three identified AmbPAG sequences were also relatively similar to mature forms of purified native boPAG56-75kDa proteins. This is the first report indicating aa sequences of native AmbPAG proteins purified from placenta (CT and LCP) of bison species. The N-terminal sequences of the AmbPAGs have been deposited in the EMBL-EBI database (UniProtKB; Accession Nos.: P84916, P84917 and P84918). (C) 2007 Elsevier Inc. All rights reserved. [less ▲]

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See detailIn vitro maturation treatment affects developmental competence of laparoscopic ovum pickup-derived oocytes in follicle-stimulating hormone-stimulated goats
Locatelli, Y; Poulin, N; Baril, G et al

in Reproduction, Fertility, & Development (2008), 20(1), 182-183

The aim of the present study was to assess the effect of IVM treatment on the developmental competence of oocytes recovered from repeated laparoscopic ovum pickukp (LOPU) in goats. A total of 94 LOPU ... [more ▼]

The aim of the present study was to assess the effect of IVM treatment on the developmental competence of oocytes recovered from repeated laparoscopic ovum pickukp (LOPU) in goats. A total of 94 LOPU sessions were performed on 33 adult goats of the Saanen and Alpine breeds. Females were synchronized (Day 0) during the nonbreeding season by inserting vaginal sponges (45 mg of fluorogestone acetate, Intervet, Boxmeer, The Netherlands). At Day 8, an i.m. injection of 50 μg of cloprostenol (Estrumate; Schering-Plough Animal Health, Pointe-Claire, Quebec, Canada) was administered. Porcine FSH (Stimufol, Merial, Brussels, Belgium, 160 mg/goat) was administered in 5 injections at 12-h intervals, starting on Day 8. The LOPU took place under general anesthesia on Day 11, and follicles ≥2 mm were aspirated with an 18-gauge needle connected to a controlled vacuum system. Vaginal sponges were removed at the time of LOPU. Treatments were repeated 2 times in a 2-week interval scheme (2 goats and 1 goat were excluded from the experiment during the second and third LOPU sessions, respectively). Cumulus–oocyte complexes were washed and evaluated for quality (graded from 1 to 3). Oocytes recovered from unstimulated slaughterhouse-derived ovaries served as a control. Cumulus–oocytes complexes from Grades 1 and 2 were submitted to IVM in TCM-199, supplemented with 100 μm of cysteamine and either 10 ng mL–1 of epidermal growth factor (EGF) or 10% follicular fluid and 100 ng mL–1 of ovine FSH (FF-FSH). Matured oocytes were then submitted to IVF and in vitro development as described by Cognié et al. (2004 Reprod. Fertil. Dev. 16, 437–445). Over the 94 LOPU sessions, 20.4 ± 0.9 follicles were aspirated (mean ± SEM), allowing the recovery of 12.3 ± 0.7 COC per goat and per session, of which 80.1% were suitable for IVM (Grades 1 and 2). Results of in vitro production are detailed in the table. The IVM treatment did not significantly affect cleavage or blastocyst development rates in oocytes derived from slaughterhouse ovaries. Cleavage rates were significantly decreased in LOPU-derived oocytes when compared with control oocytes. For LOPU-derived oocytes, cleavage and final blastocyst development rates were increased significantly and kinetics of embryo development were accelerated when FF-FSH was used during IVM as compared with EGF. The IVM with FF-FSH allowed us to produce 4.1 blatocysts per goat per LOPU session. These results demonstrate the interest in LOPU for goat embryo production once appropriate IVM treatment is used. The difference observed between LOPU and slaughterhouse oocytes in terms of response to IVM treatments may be related to FSH stimulation prior to the LOPU session or to postmortem changes in oocyte responsiveness in the slaughterhouse group. [less ▲]

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See detailMeiotic segregation analysis in cows carrying the t(1;29) Robertsonian translocation.
Bonnet-Garnier, A; Lacaze, S; Beckers, Jean-François ULg et al

in Cytogenetic & Genome Research (2008), 120

Heterozygous carriers of Robertsonian translocations generally have a normal phenotype but present reproductive failure. In cattle, the t(1;29) Robertsonian translocation is very common and carriers show ... [more ▼]

Heterozygous carriers of Robertsonian translocations generally have a normal phenotype but present reproductive failure. In cattle, the t(1;29) Robertsonian translocation is very common and carriers show a 3-5% decrease in fertility. Some data suggest that female carriers have a higher decrease than male carriers but no direct studies of the chromosome content of oocytes from a t(1;29) carrier cow have been performed so far. Four heterozygous carrier cows underwent hormonal stimulations and follicles punctions and about 800 oocytes were matured in vitro. Six hundred metaphase II preparations were obtained and analysed by fluorescent in situ hybridization with bovine chromosome 1 and 29 painting probes. Proportions of different kinds of oocytes were assessed: 74.11% (292/394) were normal and balanced, 4.06% (16/394) unbalanced and 21.83% (86/394) diploid. For all cows, the number of normal oocytes was not significantly different from the number of translocated oocytes but the diploidy and unbalanced rate were significantly different between them. As found in bulls, the meiotic segregation pattern in cows has shown a preponderance of alternate products. However, the frequency of unbalanced gametes determined in females (4.06%) was significantly higher than the frequency observed in males (2.76%). The divergence in the rate of diploid gametes (0.04% vs. 21.83%) is mainly explained by the difference between males and females. [less ▲]

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See detailRéussite à l'insémination en élevages ovins laitiers pyrénéens : facteurs de variantion liés aux conduites de troupeaux
Arranz, J. M.; Freret, S.; Fidelle, F. et al

in Proceedings de la 15e Journée sur les Rencontres de Recherche chez les Ruminants (2008)

En élevage ovin-lait, la réussite à l’insémination artificielle (IA) est un facteur clé pour la maîtrise de la reproduction et la mise en œuvre des schémas de sélection. Elle a été évaluée : 1) par dosage ... [more ▼]

En élevage ovin-lait, la réussite à l’insémination artificielle (IA) est un facteur clé pour la maîtrise de la reproduction et la mise en œuvre des schémas de sélection. Elle a été évaluée : 1) par dosage de la PAG plasmatique vingt huit jours après l’insémination ; 2) par l’analyse des résultats de mise bas (MB). La différence entre ces deux valeurs permet d’estimer le niveau de pertes embryonnaires et avortements. L’étude porte sur quatre-vingt cinq lots d’insémination (8841 brebis de races Manech / Latxa tête rousse et tête noire principalement) réalisés de mai à août 2007, dans trois centres d’insémination (CIA) transfrontaliers : Navarre, communauté autonome d’Euskadi et Pyrénées Atlantiques. Les données de contrôle laitier et des CIA ont été mobilisées pour étudier les facteurs de variation de la fertilité individuelle. Un deuxième volet de l’étude, à l’échelle des lots, traite des conduites d’élevage pendant la période de lutte. Il s’appuie sur des enquêtes (alimentation, chantiers d’IA, sanitaire). La fertilité à vingt huit jours s’élève à 61,3 % et celle à la MB à 55,2 %. Les pertes sont en moyenne de 6,2 %. Pour 2/3 des lots elles sont inférieures à 7 %. L’analyse des facteurs individuels, tant pour la fertilité à vingt huit jours qu’à la MB, confirme les effets classiques des facteurs de variation de la fertilité à l’IA : intervalle IA-MB précédente, âge des femelles, mode de reproduction de la campagne précédente, production laitière au moment de l’IA, qualité de la semence. Les niveaux de pertes sont plus élevés pour les jeunes ou lorsque l’intervalle est court. Au niveau des conduites d’élevage, on observe une interaction forte race*région associée à des périodes d’IA et des conduites alimentaires différentes, mais avec des effets peu ou pas significatifs de ces conduites. Les enquêtes sanitaires font apparaître des niveaux de risques et des pathologies comparables d’une région à l’autre et élevés. Pour les lots à pertes élevées, celles-ci ont pu être reliées à des problèmes pathologiques particuliers, mais non prévisibles. Une telle approche, assez complète et globale des conduites, aura permis de renouveler le conseil en élevage et d’élargir les capacités d’intervention des techniciens. [less ▲]

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See detailPlasma luteinizing hormone and progesterone concentrations in Azawak zebu cows submitted to different estrus synchronization protocols.
Zongo, M.; Pitala, W.; Sawadogo, L. et al

in Revue d'Elévage et de Médecine Vétérinaire des Pays Tropicaux (2008), 61(3-4), 221-227

The percentage of estrus induction and plasma LH concentrations were examined in 15 Azawak zebu cows submitted to two different estrus synchronization protocols. In the first treatment (T1, n = 9), the ... [more ▼]

The percentage of estrus induction and plasma LH concentrations were examined in 15 Azawak zebu cows submitted to two different estrus synchronization protocols. In the first treatment (T1, n = 9), the cows received a norgestomet ear-implant for 10 days associated with estradiol valerate, prostaglandin F2alpha (PGF2alpha) and pregnant mare serum gonadotropin (PMSG) injections. Treatment 2 (T2, n = 6) consisted in two PGF2alpha injections 11 days apart, followed by the administration of PMSG two days after the second prostaglandin injection. Blood samples were collected every three hours during five days after implant removal (T1) or PMSG injection (T2) for LH measurements. The proportion of induced estrus was higher in T2, but the difference was not significant. In general, the elapsed time until the estrus onset tended to be shorter in norgestomet-treated animals (35.9 ± 3.9 h) than in prostaglandin-treated ones (49.5 ± 5.8 h). Seven out of nine norgestomet-treated cows, and only two out of the six treated with PGF2alpha, presented a peak of LH. The mean interval from the end of treatments to LH peak tended to be longer in PGF2-treated females than in norgestomet-treated ones. One female presenting abnormally high LH concentrations after implant removal did not show a peak of LH during the observation period. [less ▲]

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See detailCorrelation between five radioimmunoassay systems for bovine pregnancy associated glycoprotein (PAG).
Ayad, A.; Melo de Sousa, Noelita ULg; Iguer-Ouada, M. et al

in Reproduction in Domestic Animals (2008), 43(Suppl 5), 90

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See detailNo effect of parity on concentrations of bovine pregnancy associated glycoprotein (PAG) measurement by radioimmunoassay.
Ayad, A.; Melo de Sousa, Noelita ULg; Iguer-Ouada, M. et al

in Reproduction in Domestic Animals (2008), 43(Suppl 5), 90

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See detailEffect of parity on pregnancy-associated glycoprotein (PAG) levels measurement by radioimmunoassay in bovine. Preliminary results.
Ayad, A.; Melo de Sousa, Noelita ULg; Iguer-Ouada, M. et al

in Proceedings of the 24nd Scientific Meeting of the European Embryo Transfer Association (2008)

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See detailDosage des pepsinogènes bovins A et C par RIA
Terroni, D.; Melo de Sousa, Noelita ULg; Michiels, J. A. et al

Poster (2008)

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See detailPregnancy diagnosis in ruminant species.
Melo de Sousa, Noelita ULg; Szenci, O.; Taverne, M. A. M. et al

in Reproduction in Domestic Animals (2008), 43(Suppl 5), 104

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See detailEffect of different treatment protocols on ovulation and pregnancy rate in dairy cattle.
Repasy, A.; Melo de Sousa, Noelita ULg; Beckers, Jean-François ULg et al

in Magyar Allatorvosok Lapja = Hungarian Veterinary Journal (2008), (Suppl II), 314

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See detailDetermination of PAG in the milk and blood in cow’s in comparison to other examination methods for pregnancy diagnosis.
Gajewski, Z.; Melo de Sousa, Noelita ULg; Konopka, A. A. et al

in Magyar Allatorvosok Lapja = Hungarian Veterinary Journal (2008), (Suppl II), 190

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