Effect of dehydration on ruminal degradability of lucerne

Repetto, José Luis; González, Javier; Cajarville, Cecilia

doi:10.1051/animres:2000111

Cited by 8 publications

(9 citation statements)

References 18 publications

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“…Mean values and standard error of k p values used to establish the ED estimates were 0.0226 ± 0.0021 (h -1 ). These values agree with those proposed by the AFRC [1] as a function of the intake level and they are very close to those obtained in similar conditions for dehydrated lucerne by Repetto et al [26].…”

Section: Ruminal Degradabilitysupporting

confidence: 92%

Effects of stage of harvest on the protein value of fresh lucerne for ruminants

et al. 2001

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-The ruminal degradation of dry matter (DM) and crude protein (CP) and the intestinal availability of CP of four fresh lucerne (Medicago sativa L.) samples, corresponding to a 3rd growing cycle and harvested at 2-week intervals, were determined. Rumen degradability, measured by the nylon bag technique, and rumen outflow rates were determined on three rumen-cannulated wethers. Intestinal digestibility was determined by the mobile bag technique on three duodenal fistulated wethers. Both groups of animals were fed a 2:1 lucerne hay to concentrate diet at an intake level of 40 g DM . kg -1 BW 0.75 . The effective degradability (ED) of DM decreased with maturity in linear and quadratic form, as a consequence of a decrease in the soluble fraction and a similar increase in the undegradable materials. The resultant values were 0.795, 0.661, 0.600, and 0.576 for harvests at 2, 4, 6, and 8 weeks. The ED of CP showed the same trend. However, the variations (values of 0.896, 0.832, 0.791, and 0.817, respectively), were moderate and mainly due to the reduction of the proportion of soluble CP. The intestinal digestibility of CP of all samples showed a downward trend with the increase in the ruminal incubation time, as modelled according to a logistic function. The undegraded CP digested in the gut (D i ) and therefore the effective intestinal digestibility (EID) were derived from this function according to the rumen outflow of undegraded CP. The effects of maturity on the mean values of D i , expressed as a proportion of the original CP content, were the opposite of those recorded for the ED of CP. These values were 0.067, 0.102, 0.115, and 0.089 for samples harvested at 2, 4, 6, and 8 weeks, respectively. Nevertheless, when D i was expressed as g CP . kg -1 DM, these values (18.0, 17.4, 17.1, and 14.3, respectively) decreased in linear form. The same trend was observed for EID values, which represent 0.641, 0.609, 0.549, and 0.488, respectively. The change of the digestion site produced by the reduction of ED of CP was also associated with an increase in the undigested CP (values of 0.037, 0.066, 0.094, and 0.094, at the four harvesting times).lucerne / stage of maturity / rumen degradability / intestinal digestibility / protein Reprod. Nutr. Dev. 41 (2001) [381][382][383][384][385][386][387][388][389][390][391][392] 381

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Section: Ruminal Degradabilitysupporting

confidence: 92%

Effects of stage of harvest on the protein value of fresh lucerne for ruminants

et al. 2001

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“…In particular, Hristov (1998) using the in sacco method on three steers, found an effective digestibility of CP of fresh alfalfa of 66.5% after 72h of incubation. In the same way, Repetto et al (2000) using an in sacco method on wethers within 72h of incubation found a percentage of protein degradability of 82%. Our values have to take into account the low incubation time (48h) and the use of faecal inoculum.…”

Section: Resultsmentioning

confidence: 69%

Effects of compost organic amendments on chemical composition andin vitrodigestibility of alfalfa (Medicago sativaL.)

Lestingi¹,

Bovera²,

Piccolo³

et al. 2009

Italian Journal of Animal Science

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the following fertiliser treatments were compared during the years 2002 and 2003 on alfalfa forage (Medicago sativa L.): compost obtained from the organic fraction of the Municipal Solid Waste (MSW); olive pomace compost (OPC); mineral fertiliser (Min). All the treatments allowed a distribution of 75kg ha -1 of P 2 O 5 . three cuttings occurred: at 168, 206 and 351 days after compost application (DAA) in 2002; 119, 152 and 320 DAA in 2003. Cumulative biomass and dry matter yields were measured during each experimental year. Furthermore, chemical composition and in vitro digestibility of dry matter (DMd), organic matter (OMd), crude protein (CPd) and NDF (NDFd) were determined. MSW treatment showed a significantly (P<0.01) higher content of ADL than OPC and Min (77.0, 66.0 and 65.0g kg -1 DM, respectively). Fertiliser treatments also affected (P<0.01) digestibility parameters. In fact, DMd and OMd values showed the same trend with lower percentages in MSW treatment than in the OPC and Min ones. the NDFd differed in all treatments having the highest value in OPC (40.1%). the results indicated that the soil distribution of organic materials offer the possibility to reduce the application of mineral fertilisers and production costs without decreasing alfalfa yield, forage chemical composition and in vitro digestibility.

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“…Dehydration of lucerne leads to an increase in the proportions of ADIN and specially NDIN and to a decrease in CP solubility [13]. Therefore, the high variability observed for the proportion of NDIN (CV = 26.3%) or the values of CP solubility (CV = 16.4%) will be related with the intensity of heating effects derived from the forage management and industrial treatments employed for the different plants.…”

Section: Discussionmentioning

confidence: 99%

“…To determine the ED of all samples, between both incubation series of the studied sample, the rate constant describing the passage from the rumen of dietary particles (k p ) was determined for the dehydrated lucerne included in the diet, which had been chopped at 6-8 cm and marked with Ytterbium (Yb) by immersion [6], at 10 mg Yb·g -1 of feed. The Rumen degradation of dehydrated lucerne 29 procedure of this determination and the resultant k p values (2.28 ± 0.22%·h -1 ) has been previously published [13].…”

Section: Methodsmentioning

confidence: 99%

“…Previous results on the effective degradability (ED) of CP of dehydrated lucerne show a great variability. Mean values obtained by the NRC [11], Verité et al [19], Kowalski et al [9], Faria-Marmol et al [4] and Repetto et al [13] were respectively: 41, 60, 64, 71 and 77.5%. Rumen degradability of dehydrated lucerne should be affected by multiple factors related to the crop, the post-harvest forage management and the industrial process of dehydration.…”

Section: Introductionmentioning

confidence: 99%

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Relationship between ruminal degradability and chemical composition of dehydrated lucerne

et al. 2003

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-The rumen degradation characteristics and effective degradability (ED) of dry matter (DM) and crude protein (CP) of 21 samples of dehydrated lucerne from 5 different processing plants were studied in three rumen fistulated wethers using the nylon bag technique. The animals were fed at an intake level of 40 g DM·kg -1 BW 0.75 with a mixed diet of lucerne (40% dehydrated and 60% hay) and concentrate (2:1 on DM). The mean values of the ED of DM and CP, calculated for rumen outflow rates determined in each animal (2.28%·h -1 , as average), presented a low variation (mean = 61.2%; CV = 5.31% for DM and mean = 73.5%; CV = 4.95% for CP). Degradation of DM was directly related to lucerne quality, with negative and positive correlations with the contents of fibre and CP, respectively. The best prediction of the ED of DM was derived from the contents of acid detergent fibre, which explained 73.3% of the total variation. The best prediction of the ED of CP (R 2 = 0.592) was related negatively to the proportion of insoluble nitrogen in neutral detergent fibre and positively to the CP concentration as the first and second predictive variables. However, the first variable allowed a good estimation of the ED of CP for the dehydrated lucerne samples presented in a long form (R 2 = 0.818). Degradation studies of DM and CP also indicated that most of the N available to animals was derived from rumen microbial synthesis. (34)915499763; e-mail: jgonzalez@pan.etsia.upm.es foin) et d'aliment concentré dans des proportions 2:1 (sur MS) à un niveau de 40 g MS·kg -1 P 0,75 . Les valeurs de DT, calculées avec les taux de sortie des particules du rumen mesurés pour chaque animal (moyenne = 2,28 %·h -1 ), ont été peu variables tant pour la MS (moyenne = 61,2 % ; CV = 5,31 %) que pour les MAT (moyenne = 73,5 % ; CV = 4,95 %). La DT de la MS a été directement liée à la qualité de la luzerne, avec des corrélations négatives et positives pour les teneurs en fibre et MAT, respectivement. La meilleure prédiction de la DT de la MS a été obtenue avec la teneur en lignocellulose (ADF), qui explique 73,3 % de la variation totale. Pour les MAT, la meilleure prédiction de la DT (R 2 = 0,592) a été négativement corrélée à la proportion d'azote insoluble dans la solution au déter-gent neutre et positivement à la teneur en MAT, respectivement première et seconde variables indé-pendantes. La première variable a permis une prédiction convenable de la DT des MAT pour la luzerne déshydratée présentée sous forme de brins longs (R 2 = 0.818). Les études de dégradation de la MS et des MAT ont aussi montré que la plus grande partie de l'azote disponible pour l'animal est fournie par la synthèse microbienne dans le rumen.luzerne déshydratée / dégradabilité ruminale / protéine / composition chimique / ovins

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Effect of dehydration on ruminal degradability of lucerne

Cited by 8 publications

References 18 publications

Effects of stage of harvest on the protein value of fresh lucerne for ruminants

Effects of stage of harvest on the protein value of fresh lucerne for ruminants

Effects of compost organic amendments on chemical composition andin vitrodigestibility of alfalfa (Medicago sativaL.)

Relationship between ruminal degradability and chemical composition of dehydrated lucerne

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