Effect of type of lucerne hay on caecal fermentation and nitrogen contribution through caecotrophy in rabbits

García, J.; Blas, C. de; Carabaño, R.; García, P. Castro

doi:10.1051/rnd:19950303

Cited by 45 publications

(34 citation statements)

References 8 publications

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“…Nor the changes in dietary CP concentration or the dietary supplementation with specific amino acids (glutamine and arginine; Chamorro et al, 2010), which may directly promote gastrointestinal integrity, modified mucosal histology of early-weaned rabbits. On the basis of current knowledge, we could hypothesise that the CP level and the concentration and characteristics of dietary fibre interact and modify both the amount of undigested protein reaching the caecum and the contribution of the endogenous nitrogen to the total ileal flux (García et al, 1995;Carabañ o et al, 2009). However, the role of this interaction on rabbit health needs to be elucidated.…”

Section: Discussionmentioning

confidence: 99%

“…In contrast, soluble fibre, particularly pectins and b-glucans that are the more readily digestible cell wall carbohydrates (Van Soest et al, 1991), can increase the energy value of diets and improve feed conversion in growing rabbits Trocino et al, 2011) while playing a positive role on gut health and caecal fermentations (García et al, 2000;Gidenne and Bellier, 2000;Falcã o-e-Cunha et al, 2004), intestinal mucosa integrity (Á lvarez et al, 2007;Gó mez-Conde et al, 2007) and microbiota composition (Gó mez-Conde et al, 2009). At constant -E-mail: gerolamo.xiccato@unipd.it ADF level, the substitution of starch with soluble fibre often reduced mortality Soler et al, 2004;Xiccato et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

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Effect of decreasing dietary protein level and replacing starch with soluble fibre on digestive physiology and performance of growing rabbits

Xiccato

Trocino

Majolini

et al. 2011

Animal

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At weaning (33 days of age), 246 hybrid rabbits (782 6 53 g live weight) were divided into six experimental groups and fed ad libitum six iso-ADF diets formulated according to a bifactorial arrangement with two protein levels (152 and 162 g/kg) and three soluble fibre-to-starch ratios (0.2, 0.6 and 1.5), the latter obtained by replacing starch (from 209 to 91 g/kg) with soluble fibre (from 48 to 136 g/kg). The trial lasted for 42 days until slaughter. The rabbits that were fed the diet with the highest protein level and the lowest soluble fibre-to-starch ratio showed the highest mortality rate (17.1% v. 1.7% on average; P , 0.001) and sanitary risk (mortality 1 morbidity: 20.0% v. 8.1%; P 5 0.04) compared with the rabbits fed the other diets. With increasing dietary crude protein level, the digestibility of dry matter (DM; 0.615 to 0.626) and gross energy (0.620 to 0.630) as well as aNDF (without sodium sulphite; 0.298 to 0.323) and hemicelluloses (0.417 to 0.461) significantly (0.001 , P , 0.10) improved. Moreover, total volatile fatty acids (VFAs) in the caecal content increased (59.0 to 68.4 mmol/l; P 5 0.01) and ileum crypt depth tended to reduce (P 5 0.07). Neither growth performance nor slaughter results were affected by the protein level. When increasing soluble fibre-to-starch ratio, the digestibility of DM and gross energy did not change, whereas the digestibility of aNDF (0.264 to 0.352), ADF (0.167 to 0.267) and hemicelluloses (0.400 to 0.470) linearly increased (P , 0.001). At caecum, N-ammonia tended to decrease linearly (P 5 0.08), total VFA concentration (56.0 to 67.3 mmol/l) and acetate proportion (80.4 to 83.3 mmol/100 mmol VFA) linearly increased (P , 0.01), whereas butyrate and valerate proportions decreased (0.01 , P , 0.05). Growth performance was similar among groups, whereas at slaughter the proportion of the gastrointestinal tract linearly increased (177 to 184 g/kg; P , 0.01) without effect on dressing percentage, however. As soluble fibre-to-starch ratio increased, meat pH linearly decreased and lightness (L*), redness (a*) and yellowness (b*) colour indexes increased (0.01 , P , 0.05).

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of decreasing dietary protein level and replacing starch with soluble fibre on digestive physiology and performance of growing rabbits

Xiccato

Trocino

Majolini

et al. 2011

Animal

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“…When protein ingestion exceeds its requirements, the return of urea with blood to the caecum may increase leading to an increase of the ammonia concentration (Fraga 1998). In an experiment of Garcia et al (1995), a decrease in the ammonia concentration in the rabbit caecum, with an increase of the natural detergent fibre content in rabbit diet, was observed. Bellier et al (1995) found a decrease of the ammonia content with the age of an animal, as opposed to the VFA content, which grew at the same time.…”

Section: Discussionmentioning

confidence: 95%

“…In our studies, an increase of molar concentrations and changes in the mutual rations of most analysed SCFA, was observed during in vitro fermentation. To facilitate the comparison with available data in literature, the percentage levels of three major acids at their total concentration were estimated (Garcia et al 1995, Piattoni et al 1995, Bennegadi-Laurent et al 2004.…”

Section: Discussionmentioning

confidence: 99%

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The effect of Linola and W92/72 transgenic flax seeds on the rabbit caecal fermentation - in vitro study

Miśta¹,

Króliczewska²,

Zawadzki³

et al. 2011

Polish Journal of Veterinary Sciences

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The effect of W92/72 transgenic flax seeds taken from a variety of Linola on the production of SCFA, ammonia and methane by bacteria inhabiting rabbit caecum was studied. The in vitro method was used where caecal contents from rabbits was incubated with W92/72 transgenic or Linola flax seeds, or without any additives (control samples).The total concentration of SCFA was higher in samples with the addition of flax seeds than in the control samples. The increase in concentrations of acetic, propionic and butyric acids was the highest in samples with Linola seeds added. A higher percentage of propionic and butyric acids was observed in the contents incubated with addition of flax seeds as compared to the control samples. This increase was the result of a percentage decrease in acetic acid. No differences were observed in the concentration of ammonia between fermented samples. Moreover, the addition of flax seeds resulted in slight decrease of pH in incubated samples. In gas samples, the methane level was higher in samples with flax seeds added, although the highest level was found in samples with transgenic seeds.In addition, gas pressure was significantly higher in samples with flax seeds added as compared to control samples, and this may indicate a higher intensity of microbiological fermentation processes. These studies suggest that neither Linola nor W92/72 flax seeds have any unfavorable effect on the caecal microflora activity of rabbits. A beneficial influence of flax seeds on the microbiological fermentation process in rabbit caecum was observed, based on an increase in percentage ratio of propionic acid in samples with flax seeds added.

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Digestion of bamboo compared to grass and lucerne in a small hindgut fermenting herbivore, the guinea pig (Cavia porcellus)

et al. 2021

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Bamboo is an enigmatic forage, representing a niche food for pandas and bamboo lemurs. Bamboo might not represent a suitable forage for herbivores relying on fermentative digestion, potentially due to its low fermentability. To test this hypothesis, guinea pigs (n = 36) were used as model species and fed ad libitum with one of three forages (bamboo, lucerne, or timothy grass) in a fresh or dried state, with six individuals per group, for 3 weeks. The nutrient composition and in vitro fermentation profile of bamboo displayed low fermentation potential, i.e. high lignin and silica levels together with a gas production (Hohenheim gas test) at 12 h of only 36% of that of lucerne and grass. Although silica levels were more abundant in the leftovers of (almost) all groups, guinea pigs did not select against lignin on bamboo. Dry matter (DM) intake was highest and DM digestibility lowest on the bamboo forage. Total short‐chain fatty acid levels in caecal content were highest for lucerne and lowest for grass and bamboo. Bamboo‐fed guinea pigs had a lower body weight gain than the grass and lucerne group. The forage hydration state did not substantially affect digestion, but dry forage led to a numerically higher total wet gut fill. Although guinea pigs increased DM intake on the bamboo diet, the negative effects on fermentation of lignin and silica in bamboo seemed overriding. For herbivores that did not evolutionary adapt, bamboo as an exclusive food resource can be considered as inadequate.

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Effect of type of lucerne hay on caecal fermentation and nitrogen contribution through caecotrophy in rabbits

Cited by 45 publications

References 8 publications

Effect of decreasing dietary protein level and replacing starch with soluble fibre on digestive physiology and performance of growing rabbits

Effect of decreasing dietary protein level and replacing starch with soluble fibre on digestive physiology and performance of growing rabbits

The effect of Linola and W92/72 transgenic flax seeds on the rabbit caecal fermentation - in vitro study

Digestion of bamboo compared to grass and lucerne in a small hindgut fermenting herbivore, the guinea pig (Cavia porcellus)

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