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See detailDetermination Of The Methionine Requirement Of Growing Double-Muscled Belgian Blue Bulls With A Three-Step Method
Froidmont, Eric; Beckers, Yves ULg; Thewis, André ULg

in Journal of Animal Science (2000), 78(1), 233-241

The three-step technique was used to determine the requirements of total amino acids (TAA) and the first-limiting amino acid (AA) in growing double- muscled Belgian Blue bulls (BBb). In Exp. 1, three ... [more ▼]

The three-step technique was used to determine the requirements of total amino acids (TAA) and the first-limiting amino acid (AA) in growing double- muscled Belgian Blue bulls (BBb). In Exp. 1, three double-muscled BBb weighing initially 306 ± 28 kg received a basal diet consisting of 30% meadow hay and 70% concentrate that was poor in digestible protein but had adequate NE because of continuous infusion of dextrose into the duodenum. The intestinal apparent digestibility of essential AA (EAA) was defined according to their duodenal and ileal flows. It averaged 72% but varied between 60% for Met and 79% for Arg. In Exp. 2, five double-muscled BBb (334 ± 22 kg) received the same diet supplemented with duodenal infusions of dextrose and four doses of Na-caseinate (28, 56, 84, and 112% of intestinal digestible dietary AA) in a 4 × 4 Latin square design with one additional animal. Nitrogen retention for the basal diet alone and the four increasing supplements of Na-caseinate reached 49, 61, 70, 80, and 86 g/d, respectively. Nitrogen utilization improved from 34.3% without Na-caseinate supplementation to a maximum of 40.6%, with the third dose supplying 788 g/d of apparently digestible AA. Based on patterns of plasma concentrations, Met, Phe, and Arg were probably the limiting AA when animals optimized N utilization. In Exp. 3, six double-muscled BBb (315 ± 25 kg) fed the basal diet received duodenal infusions of dextrose and AA, equivalent to the third dose in Exp. 2, except for digestible Met (9.3, 14.4, 18.4, 22.4, 26.4, and 30.4 g/d) in a 6 × 6 Latin square design. The Met requirement was close to 26.4 g/d on the basis of N retention. [less ▲]

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See detailEffects Of Multinutrient Blocks And Polyethylene Glycol 4000 Supplies On Intake And Digestion By Sheep Fed Acacia Cyanophylla Lindl. Foliage-Based Diets
Moujahed, Nizar; Kayouli, Chedly; Thewis, André ULg et al

in Animal Feed Science & Technology (2000), 88(3-4), 219-238

The effect of multinutrient block supply and polyethylene glycol 4000 (PEG) on intake, digestion and rumen fermentation was studied in sheep fed with air-dried Acacia cyanophylla foliage (acacia)-based ... [more ▼]

The effect of multinutrient block supply and polyethylene glycol 4000 (PEG) on intake, digestion and rumen fermentation was studied in sheep fed with air-dried Acacia cyanophylla foliage (acacia)-based diet. In Experiment I, six Noire de Thibar breed sheep (BW 46 kg) were used in double 3 3 Latin square design. All diets included about 360 g of dry matter (DM) of oat±vetch hay and acacia ad libitum. Diet D0 was without a block supplement. Diet D1 included a urea± molasses±mineral block (B1). While D2 included another type of block (B2) that differed from B1 essentially by adding polyethylene glycol 4000. Each experimental period lasted 33 days (21 days for adaptation and two periods of 5 days for measurement separated by 2 days for rest). Feed intake, apparent digestibility of organic matter (OM), crude protein (CP) and crude ®bre (CF) and retained nitrogen (Nr) were measured by total faecal collection. In Experiment II, four Noire de Thibar sheep (BW 53 kg) ®tted with rumen cannulae were fed sequentially D0, D1 and D2, respectively, to 90% of intake levels as measured in Experiment I on metabolic weight (MW) base. Fermentation parameters in rumen liquid (pH, NH3-N, volatile fatty acid (VFA)) were measured at 0, 2, 5, 8, 10, 13, 16 and 21 h after the morning meal. Protozoal number and composition in rumen ¯uid were determined at 2 h sampling time. Solid digesta kinetics through the rumen was measured using chromium (Cr) mordanced acacia. The DM and CP degradation of acacia was determined using the nylon bag technique. Acacia had a relatively high content of condensed tannins (41 g kgÿ1 of DM) and acid detergent lignin (176 g kgÿ1 of DM). B1 and B2 were high in CP (381 and 369 g kgÿ1 of DM, respectively) compared to acacia (127 g kgÿ1 of DM, 20% bound to ®bre) and hay (75 g kgÿ1 of DM). The two kinds of blocks improved similarly (P < 0:001) acacia DM intake by 195 g. Block 1 increased (P < 0:001) only diet CP digestibility and Nr. Block 2 increased (P < 0:05) by a low extent DM and OM digestibility compared to D1, and remarkably (P < 0:001) CP digestibility and Nr compared to D0 and D1. Block supplies considerably increased water intake. Both B1 and B2 increased (P < 0:001) NH3-N and VFA concentrations in the rumen liquid with a positive speci®c effect of B2 (PEG). VFA molar proportion was signi®cantly modi®ed by B1 and B2. B1 and B2 decreased acetate proportion and increased propionate and butyrate proportions as compared to D0 (P < 0:001). Protozoal number in rumen ¯uid was increased signi®cantly by B1 and B2 (P < 0:001). PEG-containing block (B2) increased protozoal number as compared to B1. Both B1 and B2 increased (P < 0:001) solid out¯ow rate, with a speci®c increasing effect of B2 (D2) when compared to B1 (D1). Blocks supply did not modify in situ DM degradability of acacia, but B2 improved (P < 0:05) effective degradability of CP when compared to D0 and D1 which were similar. It is concluded that both B1 and B2 improved the nutritive value of acacia-based diet. A further positive effect was noted in D2 (PEG), especially for N metabolism. [less ▲]

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See detailEffect Of Barley Fibres And Barley Intake On The Ileal Endogenous Nitrogen Losses In Piglets
Leterme, Pascal; Souffrant, Wb.; Thewis, André ULg

in Journal of Cereal Science (2000), 31(3), 229-239

Ileal endogenous N losses (ENL) were measured, using the 15N isotope dilution technique, in piglets (17 kg) fed different barley genotypes (naked, spring, winter with low/high beta-glucan content) or ... [more ▼]

Ileal endogenous N losses (ENL) were measured, using the 15N isotope dilution technique, in piglets (17 kg) fed different barley genotypes (naked, spring, winter with low/high beta-glucan content) or diets containing 330, 530, 730 or 930 g of a blend of barleys/kg diet. The apparent protein and amino acid digestibilities of the naked variety and the winter variety with a high beta-glucan content were, on average, significantly higher than those for the other two varieties. The ENL were inversely correlated (p<0·01) with the apparent digestibilities but the difference between each of them was not significant (p>0·05). The ENL increased linearly with the inclusion level of barley in a N-free basal diet (2 mg endogenous N/g barley). Isolated hulls added to a N-free diet at the rate of 100 or 200 g/ kg diet exerted no significant effect on the ENL (1·80 g endogenous N/kg diet in both cases vs. 1·76 g for the basal level). On the contrary, the effect of isolated bran, measured under similar conditions, was significantly higher and dependent on fibre intake (2·59 and 3·31 g N/kg diet, respectively). It is concluded that the ENL are affected by the insoluble bran fibre but not by the hulls, nor by the level of beta-glucan. [less ▲]

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See detailLes élevages intensifs: sources d'empoisonnement?
Thewis, André ULg

Learning material (1999)

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See detailSituation, spécificité et développement de la production de volailles en Wallonie.
Thewis, André ULg

Conference given outside the academic context (1999)

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See detailInulin incorporation in the pig diet as alternative to growth promoters : effect on specific systemic immunity ?
Rossi, Florence; Cox, E.; Goddeeris, B. et al

in EMBO Workshop on Molecular medicine of the gut, (1999, August)

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See detailLes productions animales et l'environnement.
Thewis, André ULg

Conference given outside the academic context (1999)

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See detailLes biotechnologies au services de l'alimentation animale.
Thewis, André ULg

Conference given outside the academic context (1999)

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See detailPerspectives de développement de la production de poulets de chair en Région Wallonne.
Thewis, André ULg

Conference given outside the academic context (1999)

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See detailDétermination du besoin en méthionine du taurillon Blanc Bleu Belge culard en finition.
Froidmont, Eric; Beckers, Yves ULg; Thewis, André ULg

in 6èmes Rencontres autour de la Recherche sur les Ruminants, Paris, France, 1-2 décembre 1999 (1999)

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See detailEffets de la nature de la ration et du moment de prélèvement du jus de rumen sur la fermentescibilité d'aliment fibreux en seringue.
Ndimubandi, Albéric; Fonck, Myriam; Buldgen, André et al

in 6èmes Rencontres autour de la Recherche sur les Ruminants, Paris, France, 1-2 décembre 1999 (1999)

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See detailLes biotechnologies dans nos élevages: craintes et espoirs.
Thewis, André ULg

Learning material (1999)

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See detailInulin incorporation in the weaning piglet diet as alternative to growth promoters.
Rossi, Florence; Cox, Eric; Godderis, B. et al

Conference (1999)

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See detailDetermination of methionine requirement of growing double-muscled Belgian Blue bull.
Froidmont, Eric; Beckers, Yves ULg; Thewis, André ULg

in Book of abstract of the VIIIth International Symposium on Protein Metabolism and Nutrition. (1999)

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See detailEffet de l'addition des tannins de châtaigniers sur la rétention azotée et la digestibilité chez les ruminants ingérant des produits herbagers.
Kriaa, Samia; Thewis, André ULg

in Tropicultura (1999), 16/17(1), 26-28

The use of chestnut tannin (CT) (hydrolysable tannins), added at a low concentration (4 g CT/100 g of total nitrogen (TN) = 0,8 g cT/kg of DM distribute) to a grass forage for growing sheep, improves the ... [more ▼]

The use of chestnut tannin (CT) (hydrolysable tannins), added at a low concentration (4 g CT/100 g of total nitrogen (TN) = 0,8 g cT/kg of DM distribute) to a grass forage for growing sheep, improves the N retention (P0,01). The improvement of N retention is explained by the decrease of nitrogen in the urine, indicating a better use of absorbed nitrogen. Moreover, the addition at these low concentrations of CT to fresh grass does not alter neither the digestibility of its constituents (OM, TN, ADF) nor the rate of ingestion. [less ▲]

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See detailAlimentation du porc: digestibilité des acides aminés.
Leterme, Pascal; Thewis, André ULg

in Agricontact (1998), (304), 1-6

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See detailCouverture des besoins en proteines et acides amines des vaches laitieres hautes productrices.
Thewis, André ULg

in Elevages Belges (1998), 52(2), 34-37

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