References of "Hornick, Jean-Luc"
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See detailLes engrais enrichis en sélénium: une alternative pour améliorer le statut en sélénium du bovin
Cabaraux, Jean-François ULg; Dotreppe, Olivier ULg; Hornick, Jean-Luc ULg et al

Article for general public (2006)

Le Sélénium (Se) est un oligo-élément indispensable au bon fonctionnement de l'organisme, notamment chez le bovin. Différents éléments plaident pour l’existence de déficits en Se dans le cheptel bovin et ... [more ▼]

Le Sélénium (Se) est un oligo-élément indispensable au bon fonctionnement de l'organisme, notamment chez le bovin. Différents éléments plaident pour l’existence de déficits en Se dans le cheptel bovin et particulièrement dans les troupeaux allaitants. Solutions injectables, bolus, supplémentation des rations… différentes méthodes permettent d’assurer un statut en Se correct chez l’animal. Une autre alternative consiste à enrichir les aliments produits au niveau de l’exploitation en utilisant des engrais enrichis en Se. Le Service de Nutrition de la Faculté de Médecine Vétérinaire a testé l’effet de ce type d’engrais sur la teneur en Se dans les aliments produits et sur le statut Se d’un troupeau de vaches allaitantes [less ▲]

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See detailGestion de la faune sauvage au Sénégal : comparaison du Parc national du Niokolo Koba et de la Réserve privée de Bandia
Vincke, Xavier; Hornick, Jean-Luc ULg; Njikam Nsangou, Ibrahim ULg et al

in Annales de Médecine Vétérinaire (2005), 149(4), 232-237

This work compares two dramatically different types of wildlife management in Senegal, a country threatened by poaching and deforestation : the first concerns the management of the Niokolo Koba National ... [more ▼]

This work compares two dramatically different types of wildlife management in Senegal, a country threatened by poaching and deforestation : the first concerns the management of the Niokolo Koba National Park, by a public utility service and the second, the management of the Bandia Reserve, a fenced area which surface is more than thousand times lower, by private investors. In order to do this comparison, the structure, type of management, evolution of flora and fauna, and management problems encountered for each protected area are analysed. This comparison allows to formulate some recommendations for a sustainable management of Senegalese wildlife. [less ▲]

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See detailTransport sanguin et métabolisme hépatique des acides gras chez le ruminant
Cuvelier, Christine ULg; Cabaraux, Jean-François ULg; Dufrasne, Isabelle ULg et al

in Annales de Médecine Vétérinaire (2005), 149

Blood transport and hepatic metabolism of fatty acids in ruminants present several particularities. The plasma profile is characterized by a very small proportion of triacylglycerols-rich lipoproteins— ... [more ▼]

Blood transport and hepatic metabolism of fatty acids in ruminants present several particularities. The plasma profile is characterized by a very small proportion of triacylglycerols-rich lipoproteins— chylomicrons and very low density lipoproteins — and a very high proportion of high density lipoproteins, which can reach 80 % of the total lipoproteins. This distribution is concomitant with a low triacylglycerol and non esterified fatty acids plasma content, but with very high esterified cholesterol and phospholipid contents. Futhermore, the ruminant is characterized by the secretion of the majority of very low density lipoproteins at intestinal level and by a very low hepatic capacity to export triacylglycerols in these lipoproteins ; ruminant is therefore more sensible to steatosis. Moreover, the intrahepatic lipogenesis of ruminant is reduced, with as results a dependence on fatty acids blood import, the fatty acids being then directed to one of the two major pathways of intrahepatic metabolism, oxidation or esterification into triacylglycerols. [less ▲]

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See detailProduction,digestion et absorption des acides gras chez le ruminant
Cuvelier, Christine ULg; Cabaraux, Jean-François ULg; Dufrasne, Isabelle ULg et al

in Annales de Médecine Vétérinaire (2005), 149(1), 49-59

From a biochemical point of view, in ruminants, there are two major groups of fatty acids. They are firstly the volatile fatty acids from the rumen metabolism of dietary carbohydrates, and secondly the ... [more ▼]

From a biochemical point of view, in ruminants, there are two major groups of fatty acids. They are firstly the volatile fatty acids from the rumen metabolism of dietary carbohydrates, and secondly the fatty acids from the rumen metabolism of lipids. This second group is made of the fatty acids synthesized by the microorganisms of the rumen and the fatty acids originating from the hydrolysis of dietary triacylglycerols, which are mostly hydrogenated by microorganisms in the rumen before intestinal absorption. In such conditions, the absorbed fatty acids are always more saturated than the ingested fatty acids. [less ▲]

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See detailAcides gras et métabolisme énergétique des muscles squelettiques chez le bovin
Cuvelier, Christine ULg; Cabaraux, Jean-François ULg; Dufrasne, Isabelle ULg et al

in Annales de Médecine Vétérinaire (2005), 149(4), 188-201

Energy metabolism of skeletal muscles in cattle is characterized by several specificities, mostly related to particularities of the digestive physiology. Energy metabolism of muscles relies on ... [more ▼]

Energy metabolism of skeletal muscles in cattle is characterized by several specificities, mostly related to particularities of the digestive physiology. Energy metabolism of muscles relies on preferential utilization of some nutrients, such as volatile fatty acids and ketone bodies on the one hand, and glucose on the other hand, the contribution of non-esterified long chain fatty acids being limited. As for other species, nutrients utilization is influenced by the nature of muscle fibers, leading to preferential metabolic pathways. Energy metabolism can be either more oxidative, oxido-glycolytic, or glycolytic. Close relationships are found between energy metabolism, chemical composition of muscle - more particularly its fat level - and organoleptic quality of meat. [less ▲]

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See detailContribution de l'élevage ovin à l'augmentation de la production de viande au Bénin
Gbangboche, A. B.; Hornick, Jean-Luc ULg; Abiola, F. A. et al

in Revue Africaine de Santé et de Productions Animales [=RASPA] (2005)

Cet article a relaté la situation de l’élevage des ruminants à travers la production, la consommation et la commercialisation de viande en Afrique subsaharienne au cours de ces trois dernières décennies ... [more ▼]

Cet article a relaté la situation de l’élevage des ruminants à travers la production, la consommation et la commercialisation de viande en Afrique subsaharienne au cours de ces trois dernières décennies. Il faut signaler que l’élevage des ovins représente particulièrement l’un des secteurs d’activité importants dans les milieux ruraux, puisqu’il nécessite peu d’investissements et les conditions de commercialisation des ovins sont très souples par rapport aux bovins pour couvrir les besoins financiers ponctuels de l’éleveur. Au Bénin, malgré la rusticité et la trypanotolérance des ovins Djallonké, un certain nombre de contraintes font que leur niveau de production est resté faible par rapport à la moyenne de l’Afrique subsaharienne. Pour optimiser la production ovine dans ce pays, l’une des priorités à la mise en place des schémas d’amélioration génétique, serait entre autre, l’estimation des facteurs influençant la croissance et la reproduction des ovins Djallonké, deux caractères intimement liés à la production de viande. [less ▲]

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See detailCaractérisation et maîtrise des paramètres de la reproduction et de la croissance des ovins Djallonké (Ovis amon aries)
Gbangboche, A. B.; Hornick, Jean-Luc ULg; Adamou-N'Diaye, M. et al

in Annales de Médecine Vétérinaire (2005), 149(3), 148-160

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See detailVariation of plasma parameters and nitrogen metabolism in finishing Belgian blue double-muscled cull females.
Cabaraux, Jean-François ULg; Dufrasne, Isabelle ULg; Istasse, Louis ULg et al

in Journal of Animal Physiology & Animal Nutrition (2005), 89(1-2), 55-62

The changes over time in plasma parameters and nitrogen metabolism were studied in finishing Belgian Blue double-muscled females offered a maize silage based diet. When compared with literature data ... [more ▼]

The changes over time in plasma parameters and nitrogen metabolism were studied in finishing Belgian Blue double-muscled females offered a maize silage based diet. When compared with literature data, plasma glucose along with triglycerides concentrations was low while non-esterifled fatty acids were high and rich in polyunsaturated forms. The concentrations in thyroid hormones, insulin-like growth factor 1 and insulin were also low and plasma insulin decreased with time. Growth hormone concentration, by contrast, increased with time. On average, the females retained 44 g nitrogen per day from an intake of 210 g but the efficiency of retention decreased with time. The fractional rates of accretion and synthesis of muscle protein were also affected by time. The dry matter content in muscle biopsies was close to 22% and increased with the finishing, as did the diameter of the tailhead adipocytes. [less ▲]

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See detailSelenium status around peripartum in beef cows and claves offered grass silage and barley produced with selenium enriched fertilizers
Cabaraux, Jean-François ULg; Hornick, Jean-Luc ULg; Schoonheere, Nicolas ULg et al

in Book of absracts of the 56th Annual Meeting of the European Association for Animal Production (2005)

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See detailVariations des teneurs en sélénium dans les aliments pour bovins et statut en sélénium chez l'animal
Cabaraux, Jean-François ULg; Schoonheere, Nicolas ULg; Hornick, Jean-Luc ULg et al

in 12ièmes Rencontres autour des Recherches sur les Ruminants (2005)

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See detailBovine pepsinogen and Prochymosin : Current knowledge, applications and outlines in the management of gastrointestinal worms
Sidikou, I. D.; Remy, B.; Hornick, Jean-Luc ULg et al

in Annales de Médecine Vétérinaire (2005), 149(4), 213-228

The characterization of the gastric aspartic proteases and the understanding of their mechanisms of activation led to several applications in many domains as the use of chymosin in cheese industries and ... [more ▼]

The characterization of the gastric aspartic proteases and the understanding of their mechanisms of activation led to several applications in many domains as the use of chymosin in cheese industries and the diagnostic of gastric diseases in humans and animals. Particularly, in cattle, the indirect measurement of pepsinogen activity is largely used for the diagnosis of ostertagiosis. Today, the gastric strongyloses are responsible for serious problems of management or the emergence of parasites resistence towards antihelminthics, and no immediate solution is available. Nevertheless, several tracks are proposed such as a more rational use of antihelminthics by the study of blood pepsinogen. This approach held our attention. The present review describes bovine pepsinogen and prochymosin, with an accent on the zymogen structure, their mechanisms of activation and the methods of blood levels measurement. The manuscript will end on the importance of the problems raised by gastric worms, and on the interest of the measurement of blood pepsinogen in the management of these diseases in cattle. [less ▲]

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See detailBovine meat production from culled females
Cabaraux, Jean-François ULg; Dufrasne, Isabelle ULg; Roux, Marc et al

in Productions Animales (2005), 18(1), 37-48

In the European Union, half of slaughtered adult cattle are female, including 60 % of adult cows and 40 % of heifers, mainly from dairy races. The animals are culled for multiple reasons that vary from ... [more ▼]

In the European Union, half of slaughtered adult cattle are female, including 60 % of adult cows and 40 % of heifers, mainly from dairy races. The animals are culled for multiple reasons that vary from one country to another and even from one herd to another. Fattening is therefore more difficult and haphazard than that of young bulls, due to the heterogeneity of their characteristics at the culling time, such as: age, race and format, medical and physiological statutes, and body condition score. The methods of finishing (outside or inside) and of feeding are also significant sources of variation. This article proposes to review the principal factors influencing the finishing of culled females. [less ▲]

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See detailCharacterisation and control of the reproduction and growth parameters of Djallonke ovines (Ovis amon aries)
Gbangboche, Armand; Hornick, Jean-Luc ULg; Adamou-N'Diaye, Maman et al

in Annales de Médecine Vétérinaire (2005), 149(3), 148-160

Plusieurs années d’efforts de recherches témoignent que l’élevage des ovins Djallonké est une activité majeure dans l’Afrique subsaharienne, si l’on en juge par la masse des connaissances produites. Les ... [more ▼]

Plusieurs années d’efforts de recherches témoignent que l’élevage des ovins Djallonké est une activité majeure dans l’Afrique subsaharienne, si l’on en juge par la masse des connaissances produites. Les auteurs, au travers d’un inventaire des différentes contributions scientifiques et techniques de 1967 à 2004, rapportent les performances de reproduction et de croissance des ovins Djallonké et les facteurs de leur variation. Les performances de reproduction ont été évaluées au travers de six critères zootechniques : cyclicité sexuelle annuelle, précocité sexuelle, intervalle entre agnelages, productions laitières, prolificité et mortalité des agneaux. Les performances de croissance ont été étudiées pendant deux périodes : la période d’allaitement naturel (croissance entre naissance et sevrage) et la période post sevrage. Les estimations des paramètres génétiques (héritabilité, corrélations génétiques et phénotypiques, répétabilité) de quelques caractères de reproduction et de croissance, ainsi que les résultats d’amélioration génétique, ont été passés en revue. Les conseils pratiques sont loin d’être uniformes étant donné la grande diversité des conditions d’expérimentation et d’analyse entre les différentes publications. [less ▲]

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