References of "Houtain, Jean-Yves"
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See detailLe point sur la séroprévalence du SDRP en Wallonie
Smeets, Frédéric; Houtain, Jean-Yves; Quinet, Christian et al

Poster (2019, February)

In 2018, a PRRS monitoring program started in Belgium. In this perspective, in Wallonia, where only 6% of Belgian pigs are kept, PRRS seroprevalence was assessed on both breeding and fattening pig farms ... [more ▼]

In 2018, a PRRS monitoring program started in Belgium. In this perspective, in Wallonia, where only 6% of Belgian pigs are kept, PRRS seroprevalence was assessed on both breeding and fattening pig farms. Serum samples (n = 1786 from 585 sows and 1201 piglets and/or growing pigs) collected in 2016 were tested with Elisa Idexx PRRS X3 on a maximum of 10 breeding and/or 5 feeder pigs per farm (i.e. 106 farrow-to-feeder/finish and 203 growing/finishing farms). An individual result was considered negative if the S:P ratio was < 0.4; a herd was considered positive if at least one pig had an S:P ratio ≥ 0.4. A survey addressed to these 309 Walloon pig owners gave 121 usable answers from 75/106 sow and 46/203 pig(let) owners. Overall, in farrow-to-feeder/finish farms, the apparent herd, individual and intra-herd prevalence were respectively 35% (95% c.i.: 26-43%), 36% (95% c.i.: 33-39%) and 38% (95% c.i.: 35-41%). In growing/finishing farms, the apparent herd, individual and intra-herd prevalence were respectively 60% (95% c.i.: 53-67%), 54% (95% c.i.:51-58%) and 85% (95% c.i.: 82-88%). This study showed that approximately 2/3 of Walloon breeding farms appear to be PRRS free. The next step will be to identify risk and protective factors from the survey. In the perspective of starting a national PRRS control program, these indicative results, even though they need to be confirmed, will be helpful in making specific regional decisions. [less ▲]

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See detailThe most likely time and place of introduction of BTV8 into belgian ruminants
Saegerman, Claude ULiege; Mellor, Philip; Uyttenhoef, Aude ULiege et al

in PLoS ONE (2010), 5(2),

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See detailUtilisation répétée des gonadotropines exogènes dans le contrôle de la reproduction: justifications et effets secondaires potentiels
Drion, Pierre ULiege; Houtain, Jean-Yves; MC Namara, M. et al

in Annales de Médecine Vétérinaire (1998), 142(2), 373-396

Gonadotropins of pituitary origin (follitropin -FSH-, lutropin -LH-, human menopausal gonadotropin -hMG) or trophoblastic origin (human chorionic gonadotropin - hCG- also called pregnant urine ... [more ▼]

Gonadotropins of pituitary origin (follitropin -FSH-, lutropin -LH-, human menopausal gonadotropin -hMG) or trophoblastic origin (human chorionic gonadotropin - hCG- also called pregnant urine gonadotropin -pU-, equine chorionic gonadotropin -eCG- also called pregnant mare serum gonadotropin -PMSG-) are largely used to treat infertility or to better control sexuality in various species of mammals: bovine, canine, caprine, equine, feline, human,ovine, porcine, rabbit, ... This manuscript reports the discovery of these molecules, describes their biochemical characteristics and gives the main indications (e.g. oestrus induction and synchronization, ovulation, superovulation, fertility improvement, anoestrus treatment, receptivity induction) in animals and human. Litterature data reporting on effects and possible side effects of their repeated use are presented. Due to slight differences in amino acids sequences, carbohydrates contents and tridimentionnal structures, repeated use of exogeneous gonadotropins may induce immunological reactions leading to non specific reactions and lower biological response. A reflection concludes this revue, pointing out the positive influence of the philogenetic distance existing between the species origin of the gonadotropin (human or equine) and the treated one, on the intensity of the immune reaction. [less ▲]

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See detailRegolazione della crescité follicolare e luteinica. Ovulazione, corpo luteo e luteolisi
Drion, Pierre ULiege; Ectors, Fabien; Hanzen, Christian ULiege et al

in Riproduzione dei Ruminanti (1997), 14(9), 17-25

Most ovarian follicles (99.9%) will end up with follicular atresia. During antral stages atresia depends on a reduction of FSH levels secondary to estradiol and inhibin secretions by the dominant follicle ... [more ▼]

Most ovarian follicles (99.9%) will end up with follicular atresia. During antral stages atresia depends on a reduction of FSH levels secondary to estradiol and inhibin secretions by the dominant follicle. Plasma levels in estradiol higher than 12pg/ml for at least 12 hours in bovine will cause the reversal of the negative feed-back effect of estradiol on the hypothalamus inducing the preovulatory peak of LH. So that the ovulatory discharge does not occur prematurely, the dominant follicle also secretes GnSIF which desensitises the hypohtesis to the action of GnRH. After ovulation, the corupus luteum, a true endocrine gland, develops. [less ▲]

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See detailRegolazione della crescité follicolare e luteinica. Folliculogenesi e atresia. Summa.
Drion, Pierre ULiege; Beckers, Jean-François ULiege; Ectors, Fabien ULiege et al

in Summa (1997), 14(9), 5-16

Hypophyseal production of FSH and LH depends on a pulsating secretion of GnRH by the Hypothalamus. At the beginning of the cycle, this secretion sets free the FSH from the hypothesis responsible for ... [more ▼]

Hypophyseal production of FSH and LH depends on a pulsating secretion of GnRH by the Hypothalamus. At the beginning of the cycle, this secretion sets free the FSH from the hypothesis responsible for follicular recruiment. The recruited follicles produce estradiol, inhibin and follistatin which reduce the FSH secretion (negative feed back) reducing their support to hormonodependant follicles which become atresic. The dominant follicle, subjected to internal self stimulation is not sensitive to the reduction in FSH levels and carries on synthesising more and more estradiol. [less ▲]

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