References of "Hornick, Jean-Luc"
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See detailAssessment of the selenium status in cattle herds in Wallonia
Mehdi, Youcef ULg; Dotreppe, Olivier ULg; Robaye, Vincent ULg et al

in 64th Annual Meeting of the European Federation of Animal Science (2013, August 26)

The selenium content is low in the soil of Wallonia, the southern part of Belgium. It is therefore logical that the selenium content in feedstuffs grown in these fields-grass, conserved forages, cereals ... [more ▼]

The selenium content is low in the soil of Wallonia, the southern part of Belgium. It is therefore logical that the selenium content in feedstuffs grown in these fields-grass, conserved forages, cereals and by-products- is also low. A survey was carried on 166 farms in Wallonia. The farms were located in 4 specific agronomy areas- Pays de Herve with mainly pastures (4farms)- Ardennes (a sub-mountainous area and pastures, 24 farms), Hesbays with mainly arable lands (55 farms) and Condroz with both pastures and arable (83 farms) There were herds with dairy cow, herds with beef cow and herds with both types of animals. The average age was 44±15 months for the cows and 18±6 months for the heifers. The blood samples were taken on five healthy animals of each herd, on the end of the winter just before the animals went to pastures. The selenium status was assessed by the activity of the Glutathion peroydase. The selenium status was extremely variable for the different farms of the 4 areas with variation coefficient of 56%. It was in Pays de Herve and in Hesbaye that the average selenium status was the highest at 53 and 56 µg Se/l. By contrast, it was in Ardenne and in Condroz that the status was the lowest, at 39 and 43 µg Se/l. The selenium status was, on the whole, higher in the dairy herds than in the beef herds owing to the higher selenium provision by the mineral mixtures and the compound feedstuffs added to the diet. Assuming that the normal selenium concentration in plasma being 70µg/l, it appeared also that 81% of the individual animals tested were below the normal Se concentration. It can thus be concluded from the present survey that the cattle herds in Wallonia are deficient in selenium. [less ▲]

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See detailEffect of breed, age and sex on selenium content of dromedary
Sahraoui, Naima; Boudjenah, Saliha; Dotreppe, Olivier ULg et al

in Sahraoui Journal of Camelid Science (2013), 6

The dromedary camel is able to produce meat and milk in arid conditions and its production is appreciated by the autochthon population. The aim of this study was to determine the selenium concentration in ... [more ▼]

The dromedary camel is able to produce meat and milk in arid conditions and its production is appreciated by the autochthon population. The aim of this study was to determine the selenium concentration in 61 Longissimus dorsi muscle samples representing three Algerian camel breeds (Tergui, Sahraoui or Naili breeds), the age of the selected camels ranged between 8 months and 13 years old. The muscle samples were collected from the slaughterhouse of Ouargla (South East Algeria) representing 41 males and 20 female. The average content of selenium was 0.216 mg.kg-1of wet tissue, which is higher than values currently reported in most ruminants. The level of Se was not influenced by age and sex. However, Tergui breed contained significantly higher selenium than other breeds, which may be due to diet composition intake. In conclusion, the meat from camels in Algeria is a good source of selenium, assessing its nutritional interest for human. [less ▲]

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See detailMuscle Characteristics, Meat Tenderness and Nutritional Qualities Traits of Borgou, Lagunaire and Zebu Fulani Bulls Raised on Natural Pasture in Benin
Salifou, C.F.A.; Dahouda, Mahamadou; Houaga, I et al

in International Journal of Animal and Veterinary Advances (2013), 5(4), 143-155

This study was carried out to evaluate muscle characteristics, meat ten derness and nutritional qualities of Benin indigenous cattle raised on natural pasture. Thus, 10 Zebu Fulani, 10 Borgou and 5 ... [more ▼]

This study was carried out to evaluate muscle characteristics, meat ten derness and nutritional qualities of Benin indigenous cattle raised on natural pasture. Thus, 10 Zebu Fulani, 10 Borgou and 5 Lagunaire were slaughtered at 5 years old and their Longissimus thoracis muscle samples were collected for analyses. Lactate dehydrogenase activity of Zebu Fulani was higher (p<0.05) than that of Lagunaire (3494 vs 2813 μmol/min/g protein) while that of Borgou was not significantly different from those of the two other breeds (p>0.05). As for isocitrate dehydrogenase, citrate synthase, cytochrome oxidase and phosphofructokinase, no significant difference was observed between the three breeds (p>0.05). By contrast, the total collagen content of Borgou (5.2 mg OH-proline/mg dry matter) was higher (p<0.01) than those of Zebu Fulani (3.1 mg OH-proline/mg dry matter) and Lagunaire (3.2 mg OH-proline/mg dry matter). The myosin heavy chain isoforms I, IIa and IIx were not different between the three breeds. The dry matter, the crude protein and the ether extract percentage were not significantly varied from one breed to another. Branched-chain Fatty Acids and saturated fatty acids contents were identical in Lagunaire and Borgou (p>0.05) while the Zebu Fulani had the highest values (p<0.05). The ratio n-6 to n-3 fatty acids obtained in the Zebu was the lower. In general, according to the fatty acids profile, Borgou and Lagunaire bulls’ meat is better than that of Zebu for heart disease [less ▲]

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See detailBurundi: principales réalisations du projet de coopération (2ème partie)
Chapaux; Knapp, Emilie ULg; Ngiyimbere, S et al

in Wallonie Elevages (2013)

Lors d’un précédent article, nous avons décrit 2 systèmes d’exploitation importants au Burundi. Celui d’une station d’élevage avec des animaux de races locales (Sahiwal, Ankolè) parfois croisées avec des ... [more ▼]

Lors d’un précédent article, nous avons décrit 2 systèmes d’exploitation importants au Burundi. Celui d’une station d’élevage avec des animaux de races locales (Sahiwal, Ankolè) parfois croisées avec des races laitières et celui des petites exploitations détenant principalement des animaux de race frisonne. Les animaux de la station sont en pâturage semi-extensif et subissent de fortes carences alimentaires en saison sèche. Les moyennes journalières de production laitière varient de 2,5 l à 5l pour les Sahiwal et sont proches de 15 l dans les petites exploitations. Les productions plus élevées dans ces dernières s’expliquent par une génétique (race frisonne) et des facteurs environnementaux (couverture des besoins alimentaires, pression parasitaire) plus propices. A la station, dans des conditions d’élevage bien plus difficiles, les animaux croisés avec des races laitières ont une production légèrement plus élevée en saison humide où les fourrages ne manquent pas, mais une production moins élevée que celle des races locales en saison sèche. Cette observation montre l’importance de conserver le potentiel génétique des animaux tropicaux, bien adaptés à leur environnement (meilleure valorisation des fourrages et meilleure résistance aux maladies endémiques). Dans cet article, nous allons présenter succinctement les principales réalisations du projet (suivi de la reproduction, de l’alimentation et suivi parasitaire), que nous avons entreprises en concertation avec les responsables de l’élevage et les éleveurs. Dans le prochain article, nous présenterons les premiers résultats de l’essai de croisement BBB avec des races locales. [less ▲]

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See detailELEVAGE DES POULETS TRADITIONNELS OU INDIGÈNES AU SÉNÉGAL ET EN AFRIQUE SUBSAHARIENNE : Etat des lieux et contraintes
Ayssiwede, Simplice Bosco; Dieng, Abdoulaye; Houinato, M.R.B. et al

in Annales de Médecine Vétérinaire (2013), 158

Cette synthèse aborde les multiples rôles (sociaux, culturels, économiques, religieux, alimentaires et agricoles) de l’aviculture villageoise dans la lutte contre la pauvreté et l’insécurité alimentaire ... [more ▼]

Cette synthèse aborde les multiples rôles (sociaux, culturels, économiques, religieux, alimentaires et agricoles) de l’aviculture villageoise dans la lutte contre la pauvreté et l’insécurité alimentaire des populations africaines. Elle décrit les caractéristiques des différents systèmes existants (extensif et amélioré) et les pratiques d’alimentation observées dans ce sous-secteur avicole. Après avoir passé en revue les variétés phénotypiques existantes dans la population de poules locales africaines et les performances zootechniques des sujets exploités au Sénégal et dans diverses régions d’Afrique subsaharienne, elle met un accent particulier sur les différentes contraintes (précarité des d’habitats, fortes mortalités, maladies aviaires, prédateurs, irrégularité et déficit d’approvisionnement alimentaire, accès au crédit…) qui freinent le développement de l’aviculture traditionnelle au Sénégal et en Afrique subsaharienne. [less ▲]

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See detailAmélioration des bilans d'excrétion d'azote dans deux exploitations laitières de la région wallonne par un suivi raisonné des rations
Knapp, Emilie ULg; Istasse, Louis ULg; Hornick, Jean-Luc ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2013), 17

Deux exploitations laitières situées l'une en Pays de Herve et l'autre en Ardenne ont fait l'objet de suivis réalisés en vue de déterminer les bilans d'excrétion azotée. Dans la première exploitation, les ... [more ▼]

Deux exploitations laitières situées l'une en Pays de Herve et l'autre en Ardenne ont fait l'objet de suivis réalisés en vue de déterminer les bilans d'excrétion azotée. Dans la première exploitation, les vaches étaient divisées en deux groupes, à savoir le groupes de hautes productrices (HP) et le groupe des basses productrices (BP), chaque groupe recevant une ration spécifique. Dans la seconde exploitation, les animaux constituaient un seul groupe. [less ▲]

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See detailSelenium in the environment, metabolism and involvement in the body functions
Mehdi, Youcef; Hornick, Jean-Luc ULg; Istasse, Louis ULg et al

in Molecules (2013), 13

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See detailInfluence de facteurs environnementaux influençant la teneur en urée dans le lait de vache en Wallonie et estimation des rejets azotés
Dufrasne, Isabelle ULg; Knapp, Emilie ULg; Istasse, Louis ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2013), 17

En Wallonie, les teneurs en urée du lait de tank sont déterminées dans toutes les fermes lors de chaque livraison à la laiterie par le Comité du lait. Un total de 8 295 337 données récoltées pendant ... [more ▼]

En Wallonie, les teneurs en urée du lait de tank sont déterminées dans toutes les fermes lors de chaque livraison à la laiterie par le Comité du lait. Un total de 8 295 337 données récoltées pendant l’année 2000 et la période 2002-2011 ont été analysées à l’aide d’un modèle linéaire. Les effets fixes de la région agricole ou de l’appartenance à la zone vulnérable, du mois, de l’année, des interactions entre ces paramètres ont été inclus dans le modèle. Les teneurs en matières grasse et protéique ont été utilisées comme covariables. La moyenne des teneurs en urée dans le lait a été de 255 mg.l-1. Les modèles ont permis d’expliquer 38 % et 35 % des variations des teneurs en urée pour la région agricole et pour la zone vulnérable respectivement. À l’intérieur de ces modèles, le mois, la région, l’année et l’interaction mois – année ont été les composantes les plus explicatives. Les teneurs en urée ont été plus élevées pendant la période d’avril à octobre et les plus faibles pendant la période de novembre à mars (287 vs 210 mg.l-1). Cette observation peut être expliquée par le changement de ration. Pendant la période estivale, l’herbe constitue une part variable dans la ration et peut apporter une quantité d’azote excédentaire par rapport aux besoins des animaux. Quatre pour cent des observations ont été supérieures à 350 mg.l-1 pendant la période de novembre à mars et 14 % à 400 mg.l-1 pendant la période d’avril à octobre. Dans les régions agricoles limoneuse et sablo-limoneuse, les teneurs en urée ont été plus faibles qu’en Haute Ardenne et en Ardenne (223 et 220 mg vs 278 et 284 mg.l-1 respectivement). Dans la zone vulnérable, les teneurs en urée ont été plus basses que dans la zone non vulnérable (236 vs 273 mg.l-1). Les rejets annuels azotés calculés à partir de différentes équations ont varié de 82 à 119 kg N par vache selon la région agricole. [less ▲]

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See detailInfluence de facteurs environnementaux influençant la teneur en urée dans le lait de vache en Wallonie et estimation des rejets azotés
Dufrasne, Isabelle ULg; Knapp, Emilie ULg; Istasse, Louis ULg et al

in Vandenberghe, Christophe; Colinet, Gilles; Destain, Jean-Pierre (Eds.) et al 2ème Atelier Nitrate-Eau, évaluation du programme de gestion durable de l'azote (2013)

En Wallonie, les teneurs en urée du lait de tank sont déterminées dans toutes les fermes lors de chaque livraison à la laiterie par le comité du lait. Un total de 8295337 données récoltées pendant l'année ... [more ▼]

En Wallonie, les teneurs en urée du lait de tank sont déterminées dans toutes les fermes lors de chaque livraison à la laiterie par le comité du lait. Un total de 8295337 données récoltées pendant l'année 2000 et la période 2002-201 ont été analysées à l'aide d'un modèle linéaire. [less ▲]

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See detailEffect of Azawak colostrum administration on plasma protein profile in red kid
Abdoul, H; Marichatou, H; Beckers, Jean-François ULg et al

in Proceedings of the 2nd Scientific Meeting of the Faculty of Veterinary Medicine (2012, October 19)

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See detailEffect of bovine Azawak colostrum administration on plasma protein profile in red kid.
Abdou, Harouna ULg; Marichatou, Hamani; Beckers, Jean-François ULg et al

Poster (2012, October 11)

This study evaluated the impact of heterologous Azawak colostrum administration on plasma protein profile in red kids from Niger. Forty (40) newborn kids were affected to one of two treatments: control ... [more ▼]

This study evaluated the impact of heterologous Azawak colostrum administration on plasma protein profile in red kids from Niger. Forty (40) newborn kids were affected to one of two treatments: control group (access to water and the mother) and colostrum group (access to the mother, water and additional 50 ml of colostrum Azawak/animal the day of birth, then 25ml/animal/day from the 2nd to 15th day). Blood samples (10ml/animal) were obtained at the age of 10 and 30 days by jugular puncture into EDTA vacutainer tubes. The quantification of total protein was performed by the Biuret method. The agarose gel electrophoresis was used to determine serum levels of albumin, ɑ-globulin, β1-globulin, β2-globulin, γ-globulin and finally the albumin/globulin ratio. In general, the average concentrations of these proteins obtained at both ages reached higher values in colostrum than in control group. At day 10, the colostrum group tended to show (P <0.07) higher levels for ɑ-globulin and showed higher values (P <0.04) for β1-globulin. At day 30, total protein and β2-globulins were higher in colostrum group. The administration of heterologous colostrum in kid seems to have positive effects on some plasma parameters. It would be worth to discriminate the plasma proteins derived from bovine and maternal colostra. [less ▲]

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See detailPrincipes toxiques, toxicité et technologie de détoxification de la graine de Jatropha curcas L. (synthèse bibliographique)
Nesseim, Thierry Daniel Tamsir; Fillet, Marianne ULg; Mergeai, Guy ULg et al

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (2012), 16(4), 531-540

The use of meal from the crushing of Jatropha curcas seed for livestock feed is limited owing to the variable amounts of seed available. This availability depends on the level and variety of toxic and ... [more ▼]

The use of meal from the crushing of Jatropha curcas seed for livestock feed is limited owing to the variable amounts of seed available. This availability depends on the level and variety of toxic and antinutritional compounds contained in the seed at a given time; the most important of these compounds are phorbol esters and curcin. The phorbol esters present in J. curcas seed are euphorbiaceae diterpenes, known for their inflammatory action resulting in irritation and toxicity to insects, fish and mammals. These compounds are sometimes completely degraded in soil and they may be reduced by physical, chemical or biological processes, with a reduction ratio of between 50 and 95%. Curcin is an irritating toxalbumin with lectin activity; it is inactivated by heat treatment at 121 °C for 30 min. Other antinutritional compounds are also present in J. curcas seed, such as saponins and an inhibitor of trypsin activity. This trypsin-inhibiting compound interferes with the digestion process and its reduction is achieved through thermal, chemical or biological treatments. The elimination of, or at least a reduction in the levels of, these molecules represents a rerequisite for using J. curcas meal in the livestock feed sector. [less ▲]

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See detailReproduction et production laitière de bovins sélectionnés ou de races locales au Burundi
Chapaux, Philippe; Knapp, Emilie ULg; Ngiyimbere, S et al

Poster (2012)

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See detailPratiques d’élevage extensif et performances de bovins de race locale et croisés des races laitières exotiques à Beni, RD Congo
Kibwana, Denise Katungu; Makumyaviri, A.M.; Hornick, Jean-Luc ULg

in Revue d'Elévage et de Médecine Vétérinaire des Pays Tropicaux (2012), 65

In order to analyze the relationship between farming practices and animal performance of mixed breed cows, in Beni area, North Kivu Province, DR Congo, a study was conducted from July 2003 to November ... [more ▼]

In order to analyze the relationship between farming practices and animal performance of mixed breed cows, in Beni area, North Kivu Province, DR Congo, a study was conducted from July 2003 to November 2006, on 8676 cattle stemming from 65 farms composed of 4945 cows from local breed and animals crossed with exogenous breeds considered ameliorative. Demographic observations, milk production measurements, investigations and follow-up relating to reproductive parameters have been performed. Data were analyzed by the chi-squared test and by generalized linear models, according to genotype, forage quality and characteristics of the supplement. Results showed, to some extent, an involvement of the farmers in their speculation, but a low turnover rate of the herds. The breeding practices influenced milk production, age at first calving and calving interval. In crossed type , milk production was more than twice that observed in local breed. The complementation as forage and concentrate increased milk production mildly but significantly, when compared to the situation without complement. First calving age and calving interval were highly influenced by genotype, and calving interval also by the complementation and the improved forage. These results highlight the effects of livestock management on milk and reproductive performance of cows actually raised in the region [less ▲]

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See detailÉtude de la cyclicité en relation avec le poids vif et l’état corporel chez les agnelles Ouled Djellal nées en automne dans la région Est de l’Algérie
Lamrani, F; Benyounes, A; Sulon, J et al

in Annales de Médecine Vétérinaire (2012), 156

The objective of the present work was to describe the cyclicity of Ouled Djellal ewes born one year before regarding their live weight and body condition score, during the autumn season. The study has ... [more ▼]

The objective of the present work was to describe the cyclicity of Ouled Djellal ewes born one year before regarding their live weight and body condition score, during the autumn season. The study has been driven in the region of Guelma, East of Algeria, on 104 ewes belonging to two farms. At the beginning of the study, ewes from farms A and B had similar ages but differed in live weight and body condition scores. The concentration of progesterone wasdetermined by radioimmunoassay. The level of spontaneous cyclicity, as well as the plasmatic level of the progesterone, were influenced significantly by both live weight and body condition score (P<0.0001). If the first was in favor of ewes with high body weight and body condition score, the second seemed to be higher in slim cyclic ewes. The body fatness appears to influence positively the age of puberty. [less ▲]

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See detailPhysiologie de la production et composition chimique du colostrum des grands mammifères domestiques: généralités
Abdou, Harouna; Marichatou, H; Beckers, Jean-François ULg et al

in Annales de Médecine Vétérinaire (2012), 156

In most mammals, the ingestion of colostrum is essential to the survival of the newborn. The main objective of this work is to synthesize data from studies on colostrum, especially on the physiology of ... [more ▼]

In most mammals, the ingestion of colostrum is essential to the survival of the newborn. The main objective of this work is to synthesize data from studies on colostrum, especially on the physiology of its production and its chemical composition. The sequence of events leading to the production of colostrum is identical in all species. However, the duration of these phases varies. Colostrum is rich in immunoglobulins (IgG, IgA, IgM, IgE and IgD), nutrients (proteins, lipids, lactose, minerals), hormones and growth factors (prolactin, insulin, estrogens, IgF), immune cells (leukocytes cells, epithelial cells), vitamins (carotene, vitamin E) and finally in enzymes such as lactoperoxidase and alkaline phosphatase. Its composition is dependent on many factors that can be divided into intrinsic ones, related to the animal, and extrinsic or environmental ones. Colostrum contains all the elements necessary to not only protection against attacks of pathogens but also to rapid growth of young animals. [less ▲]

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See detailEffects of environmental factors on yield and milking number in dairy cows milked by an automatic system located in pasture
Dufrasne, Isabelle ULg; Robaye, Vincent ULg; Knapp, Emilie ULg et al

in Grassland Science (2012), 17

A herd of 45 Holstein dairy cows was milked with an automatic milking system (AMS) located on a permanent pasture. The cows grazed from 22.06.2010 until 20.10.2010 on a rotational system. They were ... [more ▼]

A herd of 45 Holstein dairy cows was milked with an automatic milking system (AMS) located on a permanent pasture. The cows grazed from 22.06.2010 until 20.10.2010 on a rotational system. They were fetched twice a day to the AMS but they could also reach it freely. The sward height was measured at the entry and exit of each paddock. Data about daily milk yield and milking number were analysed according to a GLM including the effect of animal, days in paddock, distance between AMS and paddock, rotation cycle number and complementation. [less ▲]

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See detailInfluence of dietary selenium enrichment on performance and chemical composition of meat in Belgian Blue Bulls
Mehdi, Youcef ULg; Istasse, Louis ULg; Hornick, Jean-Luc ULg et al

in Proceedings of the 2nd Scientific Meeting of the Faculty of Veterinary Medicine (Liège – Belgium) (2012)

Selenium (Se) is a major structural component of various selenoproteins which contain a selenocysteine and a Se atom in their active site (except selenoprotein-P). They play an important role in many ... [more ▼]

Selenium (Se) is a major structural component of various selenoproteins which contain a selenocysteine and a Se atom in their active site (except selenoprotein-P). They play an important role in many functions, such as antioxidant defense and the formation of thyroid hormones. [less ▲]

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See detailProduction laitière et nombre de traites de vaches laitières en prairie avec un robot: effets des facteurs environnementaux.
Dufrasne, Isabelle ULg; Robaye, Vincent ULg; Knapp, Emilie ULg et al

Poster (2012)

En Belgique, comme dans d'autres pays européens, le recours à la traite robotisée est en augmentation. La majorité des troupeaux traits avec un robot ne pratique pas le pâturage car les exploitants ... [more ▼]

En Belgique, comme dans d'autres pays européens, le recours à la traite robotisée est en augmentation. La majorité des troupeaux traits avec un robot ne pratique pas le pâturage car les exploitants considèrent que cette méthode n'est pas conciliable avec le pâturage. La fragmentation des parcelles est aussi un frein au pâturage. La mise en place d'un robot dans une structure mobile permet d'utiliser le même robot à l'étable en hiver et dans les prairies distantes de l'exploitation en été. L'objectif de cette étude est de tester l'effet de facteurs environnementaux, l'animal, la complémentation, la distance entre le robot et la parcelle, les numéros du jour dans la parcelle et de cycle de rotation sur la production laitière (PL) et le nombre de traites (NT). [less ▲]

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See detailEffect of water availability on milking frequency and yield of dairy cows milked in pastures by an automatic milking system.
Dufrasne, Isabelle ULg; Robaye, Vincent ULg; Knapp, Emilie ULg et al

Poster (2012)

Nowadays farmers have to manage larger herds but at the same time, want to benefit from a normal social life. The automatic milking system (AMS) can be a solution. Its use can reduce physical labour and ... [more ▼]

Nowadays farmers have to manage larger herds but at the same time, want to benefit from a normal social life. The automatic milking system (AMS) can be a solution. Its use can reduce physical labour and allow flexibility. This technology can result in a reduction in grazing even though grazing is considered as a natural practice of the cows which is appreciated by the consumers. However, the milking frequency is decreased when outdoor grazing rather than an indoor feed systems is combined with automatic milking system (AMS) are combined compared to an indoor system. On pasture, cows tend to visit the AMS by group and enter in close succession. Improved cow traffic would allow increased milking frequency and avoid long waiting before milking. In this aim, effect of water availability in the grazing paddocks on the frequencies of cow visits to was tested. [less ▲]

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