Estimation of intestinal digestibility of undegraded sunflower meal protein from nylon bag measurements. A mathematical model

González, Javier; Sanchez, Leonardo; Alvir, M. R.

doi:10.1051/rnd:19990507

Cited by 23 publications

(53 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Thus, the lower values of IED of CP recorded for orthophosphoric acid than for malic acid may be associated with its higher impact on the increase in the r fraction and therefore of indigestible nitrogenous compounds in the intestine. Gonzá lez et al (1999) also showed increases in IED of CP, with the increase in the CP BP when comparing SFMs resulting from different industrial processes. The large increased supply of intestinal digested CP from treated meals can also be associated with a decrease in the microbial protein synthesis in the rumen derived from these meals because of their reduced fermentation.…”

Section: Ruminal Fermentation and Digesta Kineticsmentioning

confidence: 82%

Malic acid or orthophosphoric acid-heat treatments for protecting sunflower (Helianthus annuus) meal proteins against ruminal degradation and increasing intestinal amino acid supply

Arroyo

González

Ouarti

et al. 2013

Animal

View full text Add to dashboard Cite

The protection of sunflower meal (SFM) proteins by treatments with solutions of malic acid (1 M) or orthophosphoric acid (0.67 M) and heat was studied in a 3 3 3 Latin-square design using three diets and three rumen and duodenum cannulated wethers. Acid solutions were applied to SFM at a rate of 400 ml/kg under continuous mixing. Subsequently, treated meals were dried in an oven at 1508C for 6 h. Diets (ingested at 75 g/kg BW 0.75 ) were isoproteic and included 40% Italian ryegrass hay and 60% concentrate. The ratio of untreated to treated SFM in the concentrate was 100 : 0 in the control diet and around 40 : 60 in diets including acid-treated meals. The use of acid-treated meals did not alter either ruminal fermentation or composition of rumen contents and led to moderate reductions of the rumen outflow rates of untreated SFM particles, whereas it did not affect their comminution and mixing rate. In situ effective estimates of by-pass (BP) and its intestinal effective digestibility (IED) of dry matter (DM), CP and amino acids (AAs) were obtained considering both rates and correcting the particle microbial contamination in the rumen using 15 N infusion techniques. Estimates of BP and IED decreased applying microbial correction, but these variations were low in agreement with the small contamination level. Protective treatments increased on average the BP of DM (48.5%) and CP (267%), mainly decreasing both the soluble fraction and the degradation rate but also increasing the undegradable fraction, which was higher using orthophosphoric acid. Protective treatments increased the IED of DM (108%) and CP, but this increase was lower using orthophosphoric acid (11.8%) than malic acid (20.7%). Concentrations of AA were similar among all meals, except for a reduction in lysine concentrations using malic acid (16.3%) or orthophosphoric acid (20.5%). Protective treatments also increased on average the BP of all AA, as well as the IED of most of them. Evidence of higher increases for those AA showing a high resistance to degradation in the untreated meal were also observed. The total supply of metabolisable AA was increased by 3.87 times for sulphur-containing AA, whereas that of lysine was increased by 2.5 times, mainly because of lysine losses with heat treatments. These treatments and especially that with malic acid would be useful to increase the protein value of these meals but their combined use with lysine-rich protein concentrates would improve the metabolisable protein profile.

show abstract

Section: Ruminal Fermentation and Digesta Kineticsmentioning

confidence: 82%

Malic acid or orthophosphoric acid-heat treatments for protecting sunflower (Helianthus annuus) meal proteins against ruminal degradation and increasing intestinal amino acid supply

Arroyo

González

Ouarti

et al. 2013

Animal

View full text Add to dashboard Cite

show abstract

“…However, in our work, dehydration only led to a moderate reduction of ED (6.1%). No other effects of this reduction should be expected on the feed nitrogen value since different studies carried out with different feeds [10,13] indicate that heat treatments yielding no heat damage, improve the content of by-pass protein without impairing intestinal digestibility of this fraction, in spite of the increased nitrogen fibrebound contents of the feeds.…”

Section: Discussionmentioning

confidence: 99%

Effect of dehydration on ruminal degradability of lucerne

2000

Self Cite

View full text Add to dashboard Cite

-The effects of industrial dehydration and a subsequent compression at high pressures on rumen degradability of lucerne were determined in 3 samples obtained at harvest or after the process of dehydration and compression of this forage. Rumen degradability of dry matter (DM) and nitrogen (N) was determined by the nylon bag technique in 3 ruminally cannulated wethers. Dehydration reduced effective DM degradability (from 63.4 to 59.4%), which was associated with an increase of both the rumen undegradable fraction (from 30.5 to 33.4%) and the lignin content (from 65.7 to 77.9 g . kg -1 of DM). Effective degradability of N was also reduced by dehydration (from 82.7 to 77.7%), mainly by a decrease in the degradation rate (from 30.8 to 12.4% . h -1 ). The compression process produced a small but significant increase of the solubility of both DM and N, which did not alter the values of effective degradability.lucerne / dehydration / high pressure compression / rumen degradability Résumé -Effet de la déshydratation sur la dégradabilité dans le rumen de la luzerne. Nous avons étudié les effets de la déshydratation industrielle suivie d'une procédure de compression à haute pression en utilisant 3 échantillons de luzerne récoltés soit à la fauche soit après des procedés de déshydratation et de compression du fourrage. La dégradabilité de la matière sèche (MS) et de l'azote a été déterminée par la technique des sachets de nylon sur 3 moutons portant des canules du rumen. La déshydratation a produit une diminution de la dégradabilité de la MS (de 63,4 à 59,4 %), qui a été associée à une augmentation de la fraction non dégradable (de 30,5 à 33,4 %) et de la teneur en lignine (de 65,7 à 77,9 g . kg -1 de MS). Pour l'azote, la dégradabilité a été aussi réduite par la déshy-dratation (de 82,7 à 77,7 %), principalement par la chute de la vitesse de dégradation (de 30,8 à 12,4 % . h -1 ). L'emballage à haute pression a produit une augmentation modérée, mais significative, de la solubilité de la MS et de l'azote, qui, cependant, n'a pas d'effet sur la dégradabilité. luzerne / déshydratation / emballage à haute pression / dégradabilité du rumen

show abstract

“…The intestinal disappearance (ID) of undegraded material (DM or CP) was calculated as the amount lost from the bag divided by the amount in the bag before the intestinal passage. Then, the evolutions of the ID values with the rumen pre-incubation time were fitted for each animal to different functions in relation to feed to determine IED by the method proposed by González et al [1]. To obtain the effective proportion digested in the intestine of a feed fraction, these authors propose to consider together the functions which describe (1) the variation of its ID with the rumen incubation time, and (2) the outflow of undegraded material from the rumen.…”

Section: Intestinal Digestibilitymentioning

confidence: 99%

“…On the contrary, the mobile nylon bag technique, based on the incubation of rumen pre-incubated feed samples in bags that transit between the duodenum and the ileum or the anus, is a simple and adaptable method that can be used in systematic studies. The main limitation of this method is derived from the variation of the ID values with the rumen pre-incubation time in many types of feeds [1,2], as a consequence of the changes in the concentrations of undigestible nitrogenous compounds in the small intestine caused by the rumen microbial actions. This limitation can be avoided by the estimation of the intestinal effective digestibility (IED) of the feed protein from measurements with mobile bags weighed according to the rumen outflow of undegraded protein [1,3,4].…”

Section: Introductionmentioning

confidence: 99%

“…The main limitation of this method is derived from the variation of the ID values with the rumen pre-incubation time in many types of feeds [1,2], as a consequence of the changes in the concentrations of undigestible nitrogenous compounds in the small intestine caused by the rumen microbial actions. This limitation can be avoided by the estimation of the intestinal effective digestibility (IED) of the feed protein from measurements with mobile bags weighed according to the rumen outflow of undegraded protein [1,3,4]. Nevertheless, this methodology is laborious, since incubations with mobile bags should be carried out for different times of rumen pre-incubation.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

In situ intestinal digestibility of dry matter and crude protein of cereal grains and rapeseed in sheep

et al. 2003

Self Cite

View full text Add to dashboard Cite

-The ruminal degradation and intestinal digestibility (ID) of dry matter (DM) and crude protein (CP) of different feed samples were measured in two trials by using nylon bag and rumen outflow rate techniques in three wethers cannulated in the rumen and in the duodenum. In trial 1, three samples of grains of wheat, barley, and corn treated by cooking (TW, TB, and TC, respectively) were studied together with a sample of untreated corn grains (CG) of different origin. In trial 2, these studies were carried out on a sample of rapeseed (RS) and on a mix of this same sample and rapeseed meal (in proportions 70: 30) treated by cooking (TR). In both trials, the animals were fed at the same intake level (40 g DM·kg -1 LW 0.75 ) with 2:1 (DM basis) forage to concentrate diets. Rumen degradation rates of DM were high in the treated cereals (between 11.0 and 14.2%·h ) and low in the CG (6.35%·h -1 ), whereas for CP these rates were low in all cereals. For DM, in all cereals, ID decreased linearly as the ruminal incubation time increased. The values of intestinal effective digestibility (IED), calculated from these functions and from the rumen outflow, were respectively: 86.4, 62.1, 51.5, and 67.9%. For CP, ID was unaffected by the ruminal incubation time in corn samples, whereas in TW and TB a reduction of these values was only observed for the time of 48 h. The values of IED of CP for CG, TW, TB and TC were: 82.6, 88.9, 82.5, and 91.6%, respectively. Rumen degradation rates of the RS and TR samples were 8. 35 and 8.23%·h -1 for DM and 12.0 and 9.59%·h -1 for CP. In RS, the ID of DM and CP showed a downward trend with an increase of the ruminal incubation time, as modelled according to an exponential function. This same trend was observed for TR after a lag period estimated at 7.53 and 6.51 h for DM and CP, respectively. The values of IED of RS and TR were respectively 56.5 and 50.8% for DM and 71.9 and 80.1% for CP. These same results were also determined by a simplified method using a sample pooled to be representative of the rumen outflow of undegraded feed. The respective values for RS and TR were 54.8 and 51.6 for DM and 65.8 and 78.9% for CP. This method seems to be a promising technique to estimate IED, although more studies are needed to improve its accuracy.cereal / rapeseed / intestinal effective digestibility / in situ Reprod. Nutr. Dev. 43 (2003) 29-40 29

show abstract

Estimation of intestinal digestibility of undegraded sunflower meal protein from nylon bag measurements. A mathematical model

Cited by 23 publications

References 12 publications

Malic acid or orthophosphoric acid-heat treatments for protecting sunflower (Helianthus annuus) meal proteins against ruminal degradation and increasing intestinal amino acid supply

Malic acid or orthophosphoric acid-heat treatments for protecting sunflower (Helianthus annuus) meal proteins against ruminal degradation and increasing intestinal amino acid supply

Effect of dehydration on ruminal degradability of lucerne

In situ intestinal digestibility of dry matter and crude protein of cereal grains and rapeseed in sheep

Contact Info

Product

Resources

About