References of "Hanzen, Christian"
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See detailPreovulatory follicle diameter, growth rate and time of ovulation during induced oestrus using a CIDR® in trypanotolerant female Bos taurus N'Dama cattle.
Okouyi, M'foumou W'otari Marcel; Drion, Pierre ULg; Hanzen, Christian ULg

in Tropical Animal Health and Production (2015), 47

The aim of this study was to assess the dose (300 to 600 IU) effects of equine Chorionic Gonadotropin (eCG) on the preovulatory follicle diameter, growth rate, and time of ovulation characterized by ... [more ▼]

The aim of this study was to assess the dose (300 to 600 IU) effects of equine Chorionic Gonadotropin (eCG) on the preovulatory follicle diameter, growth rate, and time of ovulation characterized by echography. The eCG was injected at the end (D0) of the 7-day treatment with a controlled internal device release (CIDR) and a PGF2a being injected 2 days before the removal of the CIDR (D-2). The 120 female N'Dama cattle were distributed into five experimental groups. The control group (n = 26) was treated with physiological saline at the removal of the CIDR®, while the animals in the four treated groups received, respectively, 300 IU (n = 25), 400 IU (n = 24), 500 IU (n = 22) and 600 IU (n = 23) of eCG (Folligon®). Follicle growth rate (FGR) was significantly (P < 0.05) higher in animals treated using eCG (1.0 ± 0.4mm/day) than in the control group (0.9 ± 0.4mm/day). The diameter of the preovulatory follicle was significantly higher (P < 0.05) in the animals treated with 300 IU (10.1 ± 1.4mm) than in untreated animals (9.3 ± 1.2mm). Follicle growth rate was significantly higher (P<0.05) inn the animals treated with 300 IU (10,1 ± 1,4 mm) than in the control group (0.9±0,4 mm/day). The average interval between the time of eCG injection and ovulation was similar in the non-treated (83.7 ± 14.4 h) and treated animals (79.7 ± 11.9). Treated animals sowed a significant increase in the percentga of ovulation (94,7 %) compared to 73,1 %) (P<0.01). Use of eCG combined contributed towards synchronising the time of ovulation between 72 to 96 hours, which would facilitate the use of systematic insemination. [less ▲]

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See detailLa gestation chez les petits camélidés d'Amérique du Sud : physiologie, constat et pathologie
Hanzen, Christian ULg; Cucho Dolmos, Hernan; Ampuero Casquino, Enrique et al

E-print/Working paper (2015)

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See detailAn echographic study of follicular growth during induced estrus in female Azawak zebu in Niger
Moussa Garba, Mahamadou; Moumouni, Issa; Hamani, Marichatou et al

in Tropical Animal Health and Production (2015), 47

An echographic study of follicular growth up to ovulation was carried out on 42 lactating Azawakh cows (Bos indicus) after estrus induction by means of a PGF2α or a procedure involving the administration ... [more ▼]

An echographic study of follicular growth up to ovulation was carried out on 42 lactating Azawakh cows (Bos indicus) after estrus induction by means of a PGF2α or a procedure involving the administration of progesterone vaginally (PRID® DELTA: Progesterone-releasing intravaginal device) for a ten-day period and the injection of a PGF2α and an eCG (400 and 800 IU) on withdrawal. All the animals treated in this way were inseminated 12 and 24 hrs after the onset of estrus. The percentage of estrus induced was not significantly different between the two groups of animals (81%). The average time delay before the onset of estrus was significantly longer after injection of a PGF2α (84.8 ± 26.0 hrs) than after withdrawal of the PRID® (59.2 ± 5.8 hrs). The average duration of the estrus was significantly shorter after its induction by PGF2α (12.6 ± 2.6 hrs) than after induction by progesterone (22.9 ± 2.7 hrs). There was not a significant difference in the interval between the beginning of estrus and ovulation in animals treated by PGF2α (30.3 hrs) and progesterone (28.4 hrs). Injection of a PGF2α was accompanied by a significantly lower rate of gestation than that obtained after treatment of animals by progesterone (31.2% vs 54.5 %). These results confirm the necessity to adapt an insemination policy to hormonal treatment for estrus induction in Bos indicus. [less ▲]

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See detailLes biotechnologies de la reproduction des petits camélidés sud-américains
Hanzen, Christian ULg; Cucho Dolmo, Hernan; Ampuero Casquino, Enrique et al

E-print/Working paper (2015)

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See detailLe cycle sexuel de la femelle des petits camélidés sud-américains
Hanzen, Christian ULg; Cucho Dolmos, Hernan; Ampuero Casquino, Enrique et al

E-print/Working paper (2015)

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See detailMéthodes et innovations pédagogiques en enseignement supérieur
Hanzen, Christian ULg

Learning material (2015)

Cette présentation Power point a été réalisée dans le cadre d'un cycle de conférences données à la faculté de Médecine Vétérinaire de Constantine les 9 et 10 mai 2015. Elle aborde trois aspects ... [more ▼]

Cette présentation Power point a été réalisée dans le cadre d'un cycle de conférences données à la faculté de Médecine Vétérinaire de Constantine les 9 et 10 mai 2015. Elle aborde trois aspects complémentaires à savoir les étudiants, les méthodes et les évaluations. [less ▲]

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See detailSynedrella nodiflora (L.) Gaertn : a review on its phytochemical screening and uses in animal husbandry and medicine
Adjibode, A.G.; Tougan, U.P.; Youssao, A.K.I. et al

in International Journal of Advanced Scientific and Technical Research (2015), 3

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See detailAnatomie de l'appareil génital femelle des petits camélidés sud-américains
Hanzen, Christian ULg; Cucho Dolmos, Hernan; Amupero Casquino, Enrique et al

E-print/Working paper (2015)

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See detailPrélèvement, analyse et conservation du sperme du mâle des petits camélidés sud-américains
Hanzen, Christian ULg; Cucho Dolmos, Hernan; Ampuero Casquino, Enrique et al

E-print/Working paper (2015)

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See detailEffect of nutrition on reproductive performance during the peri-partum period of female camel (Camelus dromaderius) in Algeria.
Kelanemer, R; Antoine-Moussiaux, Nicolas ULg; Moula, Nassim et al

in Journal of Animal and Veterinary Advances (2015), 14(7), 192-196

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See detailEVALUACIÓN DE TRES DILUTORES EN LA CRIOPRESERVACIÓN DE SEMEN DE ALPACA ( Vicugna pacos ) EN PELETS
Ordonnez, Cesar; Ampuero, Enrique; Alarcon, Virgilio et al

in Spermova (Revista de La Asociación Peruana de Reproducción Animal) (2015), 5(1), 119-123

The objective of this study was to evaluate three dilutors: AndroMed®, Triladyl® and Tris base in the cryopreservation of alpaca semen in pellets, it’s was electroejaculation collected. 15 ejaculates from ... [more ▼]

The objective of this study was to evaluate three dilutors: AndroMed®, Triladyl® and Tris base in the cryopreservation of alpaca semen in pellets, it’s was electroejaculation collected. 15 ejaculates from 7 male alpacas were used; cryopreservation was evaluated by motility and sperm motility patterns (VCL, ALH); highly significant differences (p <0,01) in total sperm motility were found in cooled semen, Tris base and Triladyl® were higher. sperm curvilinear velocity (VCL) in Triladyl® was higher relative to other diluters. In the thawed semen statistical differences (p <0,05) was found in the VCL, being superior to others Triladyl®. The thawed sperm motility of the pellets is still low, lack refine protocols that allow us to have similar sperm parameters that are taken into cooling. [less ▲]

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See detailCaractéristiques et performances de reproduction du Zebu. Le cas du Niger.
Moussa Garba, Mahamadou; Issa, M; Hanzen, Christian ULg

in Revue Africaine de Santé et de Productions Animales [=RASPA] (2014), 12(3-4), 135-141

This review presents an overview of the physiological and anatomical but also reproductive performance of African zebu characteristics. It is a first step to increase his milk and and meat potential by ... [more ▼]

This review presents an overview of the physiological and anatomical but also reproductive performance of African zebu characteristics. It is a first step to increase his milk and and meat potential by using more intensively artificial insemination (AI). The use of AI depends on the use of hormonal protocols to induce and synchronize oestrus. Actually, pregnancy rates obtained are between 31.4 and 46.6% respectively after use of PGF2a or progestagens. In Niger, the average pregnancy rates after artificial insemination is 29.9%. It is higher after in natural heat (43.4%) than induced heat (25.6%); It is also considerably lower after use of PGF2a (8.4%) than progestogens (23.4 to 39.5%). Improvement requires a better understanding of the effect of dietary factors, livestock or pathological responsible for fertility and fecundity. It is therefore important to continue and intensify field trials on more substantial numbers of animals. [less ▲]

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See detailAnatomie et physiologie de la reproduction du male des petits camélidés sud-américains
Hanzen, Christian ULg; Cucho Dolmos, Hernan; Ampuero Casquino, Enrique et al

E-print/Working paper (2014)

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See detailUltrasonographic assessment of uterine involution and ovarian activity in West African Sahelian goats.
Zongo, Moussa; Traore, Boureima; Ababneh, Mohammed Mahmoud et al

in Journal of Veterinary Medicine and Animal Health (2014), 7(2), 71-76

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See detailSurvey of Artificial Insemination Practices in Algeria
Souames, Samir; Hanzen, Christian ULg; Detilleux, Johann ULg et al

in Research Journal for Veterinary Practitioner (2014), 3(1), 1-9

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See detailAnatomie et physiologie génitale bovine
Hanzen, Christian ULg; Nguyen, Kien Cuong

Learning material (2014)

La présentation concerne les rappels physiologiques et anatomiques du tractus génital de la vache. Traduite en vietnamien par le Dr. Nguyen Kien Cuong, doctorant au service de Theriogenologie de la ... [more ▼]

La présentation concerne les rappels physiologiques et anatomiques du tractus génital de la vache. Traduite en vietnamien par le Dr. Nguyen Kien Cuong, doctorant au service de Theriogenologie de la Faculté de Médecine Vétérinaire, elle a été donnée en aout 2014 aux étudiants de la faculté agrovétérinaire de l'université Nong Lam de HCMville [less ▲]

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See detailPrincipes de Reproduction des Petits Camélidés SudAméricains
Hanzen, Christian ULg; Cucho Dolmos, Hernan; Ampuero Casquino, Enrique et al

Book published by Ateliers des Presses de l'ULg (2014)

L’élevage d’alpagas et de lamas constitue une activité économique et sociale importante. Au Pérou, 200.000 familles en dépendent directement ou indirectement au travers de la production d’une fibre et ... [more ▼]

L’élevage d’alpagas et de lamas constitue une activité économique et sociale importante. Au Pérou, 200.000 familles en dépendent directement ou indirectement au travers de la production d’une fibre et d’une viande de qualité. Les petits camélidés ont largement contribué au développement politique et social de l’Empire inca qui comptait pas moins de 12 millions d’habitants. Le Pérou compte 5 millions d’alpagas et de lamas, dont 85 % sont élevés par des petits producteurs selon des méthodes traditionnelles qui se traduisent par des performances de reproduction (50 % des femelles deviennent gravides et la natalité est de 40 %) et de production (la production de laine et le poids de la carcasse sont en moyenne respectivement de 1,5 kg et 20 kg par animal). Pourtant, les petits camélidés constituent un véritable potentiel d’exploitation des pâturages naturels présents entre 4000 et 5000 mètres d’altitude et donc de production de laine et de viande, dont la valeur nutritive est bien réelle puisqu’elle ne renferme que peu de cholestérol et que sa teneur en protéines est respectivement de 24,8 et 21,6 % chez le lama et l’alpaga. Les biotechnologies de la reproduction constituent un outil majeur d’amélioration de la production animale au travers de programmes de sélection génétique. Ainsi, de nombreuses recherches ont permis d’améliorer les méthodes de collecte, d’analyse et de conservation du sperme. Elles se poursuivent dans le domaine de la production in vivo et in vitro et du transfert d’embryons. À terme, elles permettront d’améliorer la productivité des petits camélidés. En 2009, le Conseil Interuniversitaire de la Communauté Française de Belgique (CIUF) et la Commission Universitaire pour le Développement (CUD) ont signé une convention avec l’Université San Antonio Abad del Cusco. Son financement a permis d’équiper la station de recherche de La Raya de la faculté de zootechnie et de réaliser de nombreux travaux de recherche sur la reproduction des alpagas. C’est dans ce contexte et à l’initiative du docteur Christian Hanzen, professeur au service de Thériogénologie des animaux de production de la faculté de médecine vétérinaire de l’Université de Liège, qu’a été réalisé cet ouvrage de synthèse sur les connaissances actuelles en reproduction des petits camélidés, aucun ouvrage n’ayant été publié sur le sujet en langue française ou espagnole. Le livre se décline en sept chapitres à savoir (1) Anatomie et physiologie de la reproduction du mâle ; (2) Prélèvement , analyse et conservation du sperme ; (3) Anatomie de l’appareil génital de la femelle ; (4) Le cycle sexuel ; (5) Les biotechnologies de la reproduction ; (6) La gestation : physiologie, constat et pathologies et (7). La parturition, le postpartum , les pathologies et les performances de reproduction. Il est illustré de 90 figures et 14 tableaux. [less ▲]

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