Levels of lysine and methionine+cystine for growing New Zealand White rabbits

Monteiro-Motta, Ana Carolina; Scapinello, Cláudio; Oliveira, Andréia Fróes Galuci; Figueira, Josianny Limeira; Catelan, Fernanda; Sato, Joyce; Stanquevis, Caroline Espejo

doi:10.1590/s1516-35982013001200005

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…Values used are the means of 6 rabbits. Open Journal of Animal Sciences our data suggesting a methionine requirement of 0.28% of the diet[3] and the present data suggesting that of 0.27%, it seems that the methionine requirement is not as large as claimed in comparison with the earlier reports[7] [8] [10][11] [12] which proposed methionine requirements at 0.45% -0.62% of the diet; this range could be affected by the unknown cysteine levels. On the other hand, the requirement level of threonine in earlier studies[9] [10][12] [13][14] was 0.50% -0.64% of the diet.…”

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confidence: 52%

Methionine and Threonine Requirements of Dutch Rabbits Fed under a Cecotrophy Prevention Program

Abe¹,

Muramatsu²,

Sukemori³

2019

OJAS

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It is suggested that the difference in body size between domestic-type rabbits and small pet-type rabbits results in different nutrient requirements. The nutritional requirements of pet rabbits have been assessed, although such assessments require evaluation throughout the rabbit life span. The present study was conducted under a cecotrophy prevention program with young and adult rabbits. Six male Dutch rabbits were housed individually in a dormitory-type cage, and they were randomly fed graded levels of dietary methionine and threonine, at ratios of 4:0, 3:1, 2:2, 1:3, and 0:4 mixed with two types of feed, 4:0 and 0:4. Four days after switching diets and 4 hrs after starting morning feeding, approximately one milliliter of blood was collected from the vein of the ear. Free amino acid concentrations in the plasma were determined with a high-speed amino acid analyzer. Plasma concentrations of methionine and threonine compared to dietary methionine and threonine levels are shown in young rabbits. The plasma concentration of methionine remained constant at a low level and then increased linearly. The intersection was estimated as 0.16 g/d. In the same manner, the intersection of the plasma threonine value was estimated as 0.27 g/d. These values were calculated as 0.27% and 0.47% of the diets, respectively. In the case of adult rabbits, the baseline was not obtained for dietary methionine and threonine levels. The methionine requirement was estimated as 0.11 g/d. The threonine requirement was estimated as 0.22 g/d. These values were calculated as 0.15% and 0.30% of the diets, respectively. In comparison with young and adult rabbits, both methionine and threonine showed a low baseline level in young rabbits, while their variations in plasma levels of adult rabbits were not determined. The requirement of both amino acids in young rabbits is higher than that in adult rabbits. The dietary values of both amino acids in young rabbits were also higher than those in adult rabbits. Small pet-type adult rabbits required lower amino acid levels than domestic-type rabbits.

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confidence: 52%

Methionine and Threonine Requirements of Dutch Rabbits Fed under a Cecotrophy Prevention Program

Abe¹,

Muramatsu²,

Sukemori³

2019

OJAS

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“…In an experiment combining 5 levels of lysine with 3 levels of sulphur amino acids, the minimum urinary nitrogen excretion in rabbits was estimated to be 7.9 and 6.4 g/kg DM for lysine and sulphur amino acids, respectively [ 27 ].…”

Section: Discussionmentioning

confidence: 99%

Plasmatic Urea Nitrogen in Growing Rabbits with Different Combinations of Dietary Levels of Lysine, Sulphur Amino Acids and Threonine

Marín-Garcia

López-Luján

Ródenas

et al. 2020

Animals

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A total of 27 experimental diets were formulated starting from the same basal mixture, with a moderate content of crude protein and digestible energy (155 g and 9.86 MJ/kg of digestible matter (DM), respectively, both estimated). The contents of lysine, sulphur amino acids and threonine were variable. The first one, close to the current recommendations (Medium, M; 8.1, 5.8 and 6.9 g/kg DM for lysine, sulphur amino acids and threonine, respectively), and two other levels were on average 15% higher (High, H; 9.4, 6.6 and 7.8 g/kg DM for lysine, sulphur amino acids and threonine, respectively) or lower (Low, L; 6.7, 4.9 and 5.7 g/kg DM for lysine, sulphur amino acids and threonine, respectively). Diets were named with three letters, indicating lysine, sulphur amino acids and threonine levels, respectively. In total, 918 weaned rabbits (28 days old) were used (34 per diet). At weaning, animals were fed ad libitum with a commercial diet until day 46, day 47 each collective cage was randomly switched to one experimental diet. At day 48, blood samples were collected at 08:00h then the animals were subjected to 10 h of fasting and a second blood sample was extracted at 21.00h. At 08:00h, Pasmatic urea nitrogen (PUN) was higher with the L level of lysine (p < 0.001), unaffected by the level of sulphur amino acids and increased with the level of threonine (p < 0.001). At 21:00h, minimum PUN was observed with the MHL diet (14.72 ± 0.661 mg/dL). Taken into account the usual recommendations (established for a diet containing 11.3 MJ DE/kg DM, and then being 0.72, 0.51 and 0.61 g/MJ DE for lysine, sulphur amino acids and threonine, respectively), these results suggest that a diet containing more lysine and sulphur amino acids per energy unit (around 0.82 and 0.67 g/MJ DE) could better fit the growing rabbit requirements, although studies on the effects of such a diet on performance and protein retention are necessary.

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