References of "Dufrasne, Isabelle"
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See detailDevelopment of a radioimmunoassay for bovine chymosin B
Idrissa-Sidikou, Djibo; Remy, Benoit; Dufrasne, Isabelle ULg et al

in Tropicultura (2007), 25(3), 134-139

The present study was conducted to develop and validate a specific radioimmunoassay system for measurement of bovine chymosin B (bChyB) concentrations in plasma samples. Bovine ChyB was used for ... [more ▼]

The present study was conducted to develop and validate a specific radioimmunoassay system for measurement of bovine chymosin B (bChyB) concentrations in plasma samples. Bovine ChyB was used for immunization of rabbits and as standard and tracer. Chymosin B concentrations were measured in plasma samples from two groups of calves (Group 1: calves sampled from birth to 24 hours; Group 2: calves sampled from Day 1 to 21 after birth) and from one cow during the peri-partum period. Detection limit of the assay was 9.0 ng/mL. Recovery was higher than 89.3%. Repeatability and reproducibility ranged from 1.52% to 5.23% and from 1.52% to 12.57% respectively. No cross-reaction was found with pepsinogen A from bovine, porcine or human origins. In Group 1, bChyB concentrations increased from 47.3±45.1 ng/mL (5 min after birth) to 325.5±161.2 ng/mL (12 hours after birth), then it decreased till 293.0±161.5 ng/mL (24 hours after birth). In Group 2, concentrations decreased from Day 1 (455.3±191.1 ng/mL) to Day 21 (117.9±85.1 ng/mL). In adult cow, mean concentration was 136.0±32.3 ng/mL. In conclusion, bChyB is able to cross the stomach basal membrane and to reach the blood circulation at detectable levels in both young calves and adult cows. [less ▲]

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See detailDevelopment of indicators to quantify nitrogen rejections of grazing dairy cows according to fertilisation types
Meura, Stéphane; Lambert, Richard; Dufrasne, Isabelle ULg et al

in Permanent and temporary grassland plant, environment and economy; A. De Vliegher and L. Carlier (Eds); Proceedings of 14th symposium of the European Grassland Federation (2007)

Nitrogen (N) rejections are a problem of importance in cattle production. In pasture, the amounts of N rejected by the cattle are large since grass N content exceeds the ‘animals’ requirements. The ... [more ▼]

Nitrogen (N) rejections are a problem of importance in cattle production. In pasture, the amounts of N rejected by the cattle are large since grass N content exceeds the ‘animals’ requirements. The present study aims to quantify, with dairy cows in a rotational system, N rejections from urine. The trial paddocks were fertilized with compost, slurry or mineral N and grazed during 7 days by 35 dairy cows in late lactation. Milk urea concentration was determined in tank milk samples every day. Urine samples were taken from each cow at the 3rd and the 5th day after the entry in the grazing plot. Urine N and creatinin were determined to quantify urine N excretion. These observed values were compared to urine N excretion data obtained from dry matter intake and grass N content. The mean observed urine N excretion of 312 g N day-1 was similar to the mean calculated urine N excretion of 330 g N day-1. The correlation between calculated urinary N excretion and observed urinary N excretion was significant (P<0.001; r2= 22.4%) and the correlation between observed urinary N excretion and milk urea content tended to be significant (P<0.10; r2 =60%). From these data, it appears that urine N excretion prediction can be more precise with tank milk urea than with urine N excretion calculated from N intake. This research has to be continued and to be repeated during other grazing periods and with cows at different lactation periods to validate the results. [less ▲]

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See detailNitrogen balance and nitrate residues in pastures grazed by dairy cows and fertilised with mineral fertiliser, pig slurry or cattle compost
Dufrasne, Isabelle ULg; Meura, Stéphane; Cabaraux, Jean-François ULg et al

in Permanent and temporary grassland plant, environment and economy; A. De Vliegher and L. Carlier (Eds); Proceedings of 14th symposium of the European Grassland Federation (2007)

A code of good practices was established by each European member state according to the nitrate directive. In Belgium, the nitrogen (N) inputs from slurry or compost are limited to 230 kg N/ha in pastures ... [more ▼]

A code of good practices was established by each European member state according to the nitrate directive. In Belgium, the nitrogen (N) inputs from slurry or compost are limited to 230 kg N/ha in pastures. Larger amounts can be applied when a program of additional measurements, including soil nitrates analysis, is followed by the farmer. This trial aims to measure nitrogen balance and soil nitrates in pastures fertilised with mineral nitrogen fertiliser (min N), pig slurry (S) or cattle compost (C). The pastures were grazed by dairy cows and the fertilisation allowed similar efficient N levels. N inputs by fertilisation were different at 169, 170 and 102 kg N/ha in C, S and min N plots respectively. The use of pig slurry and cattle compost as compared with mineral N fertiliser increased N balance and reduced apparent N efficiency. The nitrogen, potassium and phosphorus nutrition indexes, the number of grazing days and the milk yields per ha were not different. The soil nitrate contents were not increased by use of slurry or compost. The overall low nitrate contents suggested a low nitrate leaching with the three types of fertilisation. [less ▲]

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See detailMilk urea content as influenced by geographical area and season in Wallonia
Meura, Stéphane; Dufrasne, Isabelle ULg; Cabaraux, Jean-François ULg et al

in Permanent and temporary grassland plant, environment and economy; A. De Vliegher and L. Carlier (Eds); Proceedings of 14th symposium of the European Grassland Federation (2007)

Milk urea concentration is routinely determined in commercial dairy farms along with the official milk analyses carried out on milk samples for the dairies by the “Comité du lait”. The milk urea content ... [more ▼]

Milk urea concentration is routinely determined in commercial dairy farms along with the official milk analyses carried out on milk samples for the dairies by the “Comité du lait”. The milk urea content do not modify milk price but can be useful for the farmers for diet calculation, milk urea content being related to the energy-protein ratio in the diet. The aim of this paper was to study the evolution of the milk urea content according to the months and the areas. Milk urea concentration changed according to the months owing to the diet: the summer diets, mainly composed by grass in many farms, were characterized by higher nitrogen content which as result an increase in milk urea concentration. The geographic areas can also influence milk urea concentration due to dietary difference. For example, in the Hesbaye area, beet and cereals are produced while in the Ardennes, grasslands are dominant. The urea content in milk can be an useful measurement for the diet calculations in order to decrease nitrogen waste and to reduce the feed costs. [less ▲]

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See detailDifferent treatments of linseed of culled cows and young bulls
Robaye, Vincent ULg; Dotreppe, Olivier ULg; Cabaraux, Jean-François ULg et al

in 58th Annual Meeting of the European Association for Animal Production (2007)

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See detailInclusion of cereals, hay and straw naturally enriched in selenium by use of fertilizers in horses diets: overtime effects on antioxidant markers
Hornick, Jean-Luc ULg; Paeffgen, S.; Cabaraux, Jean-François ULg et al

in 11th Congress of the European Society of Veterinary and Comparative Nutrition (2007)

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See detailInfluence de la race et du type de finition sur la composition en acides gras du muscle rectus abdominis chez la génisse
Oury, M. P.; Hornick, Jean-Luc ULg; Dufrasne, Isabelle ULg et al

in 14èmes Rencontres autour des Recherches sur les Ruminants (2007)

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See detailGrass nitrogen nutrition index and nitrate residues in pastures grazed by dairy cows and fertilised with mineral fertiliser, pig slurry or cattle compost.
Meura, S.; Dufrasne, Isabelle ULg; Cabaraux, Jean-François ULg et al

in Book of Abstracts of the 58th Annual Meeting of the European Association for Animal Production (2007)

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See detailMilk urea or urine nitrogen: indicators to quantify nitrogen rejections of grazing dairy cows according to fertilisation types
Meura, S.; Lambert, R.; Dufrasne, Isabelle ULg et al

in Book of Abstracts of the 58th Annual Meeting of the European Association for Animal Production (2007)

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See detailMilk urea content as influenced by geographical area and season in Wallonia
Meura, S.; Dufrasne, Isabelle ULg; Cabaraux, Jean-François ULg et al

in Permanent and temporary grassland plant, environment and economy, A De Vliegher an L. Carlier editors, Book of abstracts of 14th Symposium of European Grassland Federation (2007)

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See detailNitrogen balance and nitrate residues in pastures grazed by dairy cows and and fertilised with mineral fertiliser, pig slurry or cattle compost
Dufrasne, Isabelle ULg; Meura, S.; Cabaraux, Jean-François ULg et al

in Permanent and temporary grassland plant, environment and economy, A De Vliegher an L. Carlier editors, Book of abstracts of 14th Symposium of European Grassland Federation (2007)

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See detailLinseeds in fattening diet for Belgian Blue culled cows and growing bulls in order to improve the n-3 fatty acids content in meat
Robaye, Vincent ULg; Dotreppe, Olivier ULg; Cabaraux, Jean-François ULg et al

in 11th Congress of the European Society of Veterinary and Comparative Nutrition (2007)

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See detailInfluence of the geographical area and the season on the milk urea content in Wallonia
Meura, S.; Dufrasne, Isabelle ULg; Cabaraux, Jean-François ULg et al

in Book of Abstracts of the 58th Annual Meeting of the European Association for Animal Production (2007)

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See detailEvaluation des rejets azotés azotés de la vache laitière au pâturage
Meura, S.; Cabaraux, Jean-François ULg; Hornick, Jean-Luc ULg et al

in 14ièmes Rencontres autour des Recherches sur les Ruminants (2007)

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See detailEffect of iodised fertilisation on iodine content in grass and on thyroid hormones concentrations in dairy heifers.
Dufrasne, Isabelle ULg; Dotreppe, Olivier ULg; Meura, S. et al

in Permanent and temporary grassland plant, environment and economy, A De Vliegher an L. Carlier editors, Book of abstracts of 14th Symposium of European Grassland Federation (2007)

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See detailNutrition index and soil nitrate residues in grazed pastures fertilised with mineral fertiliser, pig slurry or cattle compost
Dufrasne, Isabelle ULg; Meura, S.; Cabaraux, Jean-François ULg et al

in Proceedings of the British Society of Animal Science (2007)

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See detailPerformance, slaughter characteristics and meat quality of young bulls from Belgian Blue, Limousin and Aberdeen Angus breeds fattened with a sugar-beet pulp or a cereal-based diet
Cuvelier, Christine ULg; Cabaraux, Jean-François ULg; Dufrasne, Isabelle ULg et al

in Animal Science (2006), 82(Part 1), 125-132

Thirty-six young fattening bulls from three breeds (Belgian Blue, Limousin and Aberdeen Angus) were fattened over 5 months with fattening diets based either on sugar-beet pulp or on cereals. Fattening ... [more ▼]

Thirty-six young fattening bulls from three breeds (Belgian Blue, Limousin and Aberdeen Angus) were fattened over 5 months with fattening diets based either on sugar-beet pulp or on cereals. Fattening performance as well as carcass and meat characteristics were measured. There were few relevant effects of the diets on the parameters. The breeds also showed similar fattening features. However, the BB had higher killing-out proportion and their carcasses presented better scores in terms of conformation and fattening. The meat quality of the breeds differed, especially in terms of luminosity, redness and cooking losses. There were also significant influences of breed on the chemical composition of meat; fat content was lowest in Belgian Blue and highest in Aberdeen Angus. Such specificities could help to allocate breeds in appropriate niches in Belgium. [less ▲]

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See detailComparison of composition and quality traits of meat from young finishing bulls from Belgian Blue, Limousin and Aberdeen Angus breeds
Cuvelier, Christine ULg; Clinquart, Antoine ULg; Hocquette, Jean-François et al

in Meat Science (2006), 74(3), 522-531

Thirty-six young finishing bulls from three breeds (Belgian Blue, Limousin and Aberdeen Angus) were fattened over five months with finishing diets based either on sugar-beet pulp or on cereals ... [more ▼]

Thirty-six young finishing bulls from three breeds (Belgian Blue, Limousin and Aberdeen Angus) were fattened over five months with finishing diets based either on sugar-beet pulp or on cereals. Nutritional quality traits of meat - fat content and fatty acid composition with emphasis on the n - 6 and n - 3 polyunsaturated fatty acids - along with some organoleptic quality traits were measured. The Belgian Blue bulls had the lowest intramuscular fat content associated with lower saturated and monounsaturated fatty acid contents. The polyunsaturated fatty acid content did not differ to a large extent between the breeds, the Aberdeen Angus bulls showing slightly higher values. Relative to energy intake, the overall contribution of meat to the n - 3 fatty acid recommended intake was small, whatever the breed. By contrast, the contribution of meat to daily fat intake was of greater importance, especially for the Aberdeen Angus bulls. The quality traits of meat varied also according to the breed: compared to the Aberdeen Angus, the Belgian Blue bull meat had the stablest colour, the highest drip and the lowest cooking losses. The meat of Limousin bulls had intermediate characteristics for all the parameters. (c) 2006 Elsevier Ltd. All rights reserved. [less ▲]

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