Effect of dietary protein and amino acids on the performance, carcass composition and N-excretion of growing rabbits

Maertens, Luc; Luzi, Francesca; Groote, G. De

doi:10.1051/animres:19970306

Cited by 36 publications

(40 citation statements)

References 8 publications

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“…Effect of CP level Reducing dietary CP for fattening rabbits below the reference values of 160 to 165 g/kg as-fed without affecting growth performance and meat quality would be beneficial to reduce the feeding costs and to control nitrogen excretion (Maertens et al, 1997;. In this trial, reducing dietary CP concentration from 162 to 152 g/kg as-fed did not affect growth performance.…”

Section: Discussionmentioning

confidence: 78%

“…When the main limiting amino acids are supplied (lysine, methionine and threonine), dietary CP may be further reduced from 140 to 150 g/kg diet as-fed without negative consequences on performance (Trocino et al, 2000;García-Palomares et al, 2006). Only with CP below 138 g/kg diet as-fed, daily weight gain is impaired (29%) in the entire fattening period (Maertens et al, 1997). In the post-weaning period, however, growth rate of rabbits weaned both at 25 days (Feugier et al, 2006) or at 35 days (Trocino et al, 2000) was reduced with LP diets (150 and 144 g/kg, respectively).…”

Section: Discussionmentioning

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: 78%

Section: Discussionmentioning

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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“…The full implementation of an accurate system of evaluation of ileal digestibility of amino acids (García et al, 2005) would permit an increase in nitrogen digestion efficiency and a further decrease in dietary protein content. Reducing dietary protein concentration to minimal levels also allows decreasing nitrogen excretion through manure (Maertens et al, 1997;Xiccato, 2006).…”

Section: Recommendations For Dietary Nitrogen Balancementioning

confidence: 99%

Nutritional impact on health and performance in intensively reared rabbits

Blas

2013

Animal

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The present work summarizes research related to the definition of nutrient recommendations for feeds used in the intensive production of rabbit's meat. Fibre is the main chemical constituent of rabbit diets that typically contain 320 to 360 and 50 to 90 g/kg of insoluble and soluble fibre, respectively. Instead, the dietary contents of cereal grains (,120 to 160 g/kg), fat (15 to 25 g/kg) and protein concentrates (150 to 180 g/kg) are usually low with respect to other intensively reared monogastric animals. Cell wall constituents are not well digested in rabbits, but this effect is compensated by its stimulus of gut motility, which leads to an increasing rate of passage of digesta, and allows achieving an elevated dry matter intake. A high feed consumption and an adequate balance in essential nutrients are required to sustain the elevated needs of high-productive rabbits measured either as reproductive yield, milk production or growth rate in the fattening period. Around weaning, pathologies occur in a context of incomplete development of the digestive physiology of young rabbits. The supply of balanced diets has also been related to the prevention of disorders by means of three mechanisms: (i) promoting a lower retention time of the digesta in the digestive tract through feeding fibre sources with optimal chemical and physical characteristics, (ii) restricting feed intake after weaning or (iii) causing a lower flow of easily available substrates into the fermentative area by modifying feed composition (e.g. by lowering protein and starch contents, increasing its digestibility or partially substituting insoluble with soluble fibre), or by delaying age at weaning. The alteration in the gut microbiota composition has been postulated as the possible primary cause of these pathologies.

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“…With this level of protein it is possible to reduce up to 38% of N-excretion in the fattening period (Maertens et al, 1997), and also reduce the mortality (see Table 4). However, this level may not be enough to meet the growth requirements in postweaning diets fed to very young animals (21 to 35 d old) (Maertens et al, 1997;Feugier et al, 2006).…”

Section: Practical Consequences Of a Reduction Of Dietary Protein Supplymentioning

confidence: 99%

New concepts and objectives for protein-amino acid nutrition in rabbits: a review.

Carabaño¹,

M.J.²,

García³

et al. 2010

World rabbit sci.

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ABSTRACT:In the European context, the new legislation to avoid mineral contamination and the ban on antibiotics as growth promoters has led to the defi nition of new objectives in respect of nitrogen supply. The present study summarizes the state of nitrogen nutrition in rabbits and reviews the role of protein and amino acids in rabbit health and the new nitrogen value of protein sources based on true ileal digestibility (TID) for future recommendations. The main sources of nitrogen for microbial growth are ammonia, urea and protein (endogenous and dietary). The surplus of nitrogen fl ow to the caecum increases mortality rates during fattening by favouring the growth of potential pathogenic bacteria. Accordingly, feeding strategies to reduce ileal nitrogen fl ow have been reviewed. A large reduction of dietary protein level might have negative consequences on growth performances and mortality. In order to formulate balanced lowprotein diets, data on ileal and faecal amino acid digestibility of 14 raw materials is summarized. The use of this different unit for amino acid digestibility is also discussed.

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Effect of dietary protein and amino acids on the performance, carcass composition and N-excretion of growing rabbits

Abstract: Summary — A total of 234 weanlings (32-day-old) were fed during 6 weeks ad libitum one of six diets, produced after progressively blending a high protein mixture with a low protein mixture, in order to obtain a series of six iso-energetic ( 10.4

Cited by 36 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

Nutritional impact on health and performance in intensively reared rabbits

New concepts and objectives for protein-amino acid nutrition in rabbits: a review.

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