Bestimmung des N-Erhaltungsbedarfes von Albinoratten

Lehmann, H.; Höck, A.; Bergner, H.

doi:10.1080/17450396809434261

Cited by 19 publications

(4 citation statements)

References 10 publications

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“…Faeces and urine were collected quantitatively during the last 6 days. TD and BV were calculated using Lehman's equations for endogenous and metabolic nitrogen (Lehman et al, 1968). Net protein utilization (NPU) was calculated as TD · BV/100 and content of available protein (NPV) as NPU · dietary protein content/ 100 g/kg.…”

Section: Protein Energy and Growth Promoting Values Of The Dietsmentioning

confidence: 99%

Nutritional value and physiological effects of soya‐free diets fed to rats during growth and reproduction

Pastuszewska

Taciak

Ochtabińska

et al. 2007

Animal Physiology Nutrition

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The objective of the study was to assess the effects of substitution milk and egg for soya products in breeding diets for rats, with concomitant decrease of the dietary protein level and supplementation with amino acids. Soya-containing (S) and two soya-free (NS and NSA) diets were evaluated as protein and energy sources, and their effects on reproductive performance during two cycles, and on the quality of the offspring were assessed. Organ weights were registered in females and blood parameters were determined in males. In the offspring males from S and NS groups, plasma LH, testosterone and prolactin levels were measured on the 22nd and the 60th day of life. The S diet contained more protein of smaller concentration of methionine and cystine and lower biological value than both NS and NSA diets and promoted similar post-weaning growth rate, similar body weight changes of dams during gestation and lactation and slightly lower mating efficiency. Within each reproductive cycle, the number and individual and total body weight of newborn and weanling pups did not differ but in two cycles mean number of neonates per litter and mean litter weight were significantly lower on S than on NSA diet. Plasma concentration of hormones did not differ in 22-day-old offspring males while in the older ones LH and prolactin levels were higher in animals fed on S than on NS diet. It is concluded that replacing soya protein by milk and egg protein with concomitant lowering dietary protein level and amino acid supplementation does not impair the growth rate and tends to improve reproductive performance. Feeding soya-free vs. soya-containing diets differentiates hormonal status of young males.

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Section: Protein Energy and Growth Promoting Values Of The Dietsmentioning

confidence: 99%

Nutritional value and physiological effects of soya‐free diets fed to rats during growth and reproduction

Pastuszewska

Taciak

Ochtabińska

et al. 2007

Animal Physiology Nutrition

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“…Feed intake was recorded, and faeces and urine were collected during the last 6 days. TD and BV were corrected for metabolic and endogenous urinary N, respectively, according to Lehman et al (1968). Net protein utilization (NPU = BVxTD) and utilizable protein (NPV = NPUxCP content,%) values were calculated.…”

Section: Experiments On Ratsmentioning

confidence: 99%

Chemical composition, energy value for chickens, and protein utilization in rats of rapeseed expeller cakes produced by different pressing technologies

Smulikowska¹,

Pastuszewska²,

Mieczkowska³

et al. 1997

J. Anim. Feed Sci.

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The chemical composition, glucosinolate, total and available lysine contents were determined in seven rapeseed "00" expeller cakes and one solvent meal. Five cakes were produced using a 02 ZVO press from seeds heated to 40-50°C (REM), one cake using a Rosedown press from seeds heated to over 80°C (REC No. 6), and one was an industrially prepressed cake from seeds heated to over 80°C (REC No. 7). The fat content in the cakes ranged from 10.3 to 23.2% DM. The glucosinolate content in the cakes ranged from 13.4 to 55.1 mM/g FFDM and was close to that in raw seeds when compared on a fat-free DM basis. Energy value (AME N) of REM cakes and REC No. 7 determined on chicken varied widely (8.55 to 14.60 MJ/kg DM) and was positively correlated with their fat content. Biological value (BV) of protein of four REM, two REC and solvent meal determined in rats varied from 80.1 to 96.7, despite rather uniform total and available lysine contents. BV, feed intake and weight gain of rats fed on REM tended to decrease while relative thyroid weight tended to increase as the glucosinolate content in cakes rose. It is concluded that the nutritional value of rapeseed expeller cakes produced from mildly heated seeds may vary considerably, the main factor affecting AME N being fat content, while that affecting protein value being the glucosinolate content.

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“…Feed intake was restricted to 11 g rat/day in a 4 days preliminary period followed by 6 days of collection of faeces and urine. Endogenous and metabolic N was calculated as related to body weight according to Lehman's (1968) equations. NPU was calculated as TD x BV.…”

Section: Introductionmentioning

confidence: 99%

Nutritional value of field beans (<i>Vicia faba</i> L.) differing in antinutritive factors - rat assay

Pastuszewska¹

1993

J. Anim. Feed Sci.

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In two balance experiments true protein digestibility (TD) and biological value (BV) of field bean (FB) varieties differing in tannin, trypsin inhibitor and lectin contents were studied on rats using whole (Expt. 1) and dehulled (Expt. 3) seeds. ADF and NDF digestibility and growth performance of rats fed on diets containing whole FB seeds was also assayed in Expt. 1 and 2, respectively. All diets were supplemented with 2.5 g DL-methionine and 0.5 g L-tryptophane per 16 g N. TD was negatively correlated with tannin contents (r = -0.924, P ^ 0.01) while the correlation between BV and tannins was positive but nonsignificant. TD and BV of protein of dehulled seeds were not affected either by trypsin inhibitor or lectin contents. Negative correlation between tannins and ADF digestibility was significant only when one variety was excluded from the calculations. The digestibility of NDF was not affected by tannins. Feed intake, growth rate, feed conversion and liver and pancreas weight of rats did not differ among groups fed diets containing whole FB seeds having different content of antinutrients.

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Bestimmung des N-Erhaltungsbedarfes von Albinoratten

Cited by 19 publications

References 10 publications

Nutritional value and physiological effects of soya‐free diets fed to rats during growth and reproduction

Nutritional value and physiological effects of soya‐free diets fed to rats during growth and reproduction

Chemical composition, energy value for chickens, and protein utilization in rats of rapeseed expeller cakes produced by different pressing technologies

Nutritional value of field beans (<i>Vicia faba</i> L.) differing in antinutritive factors - rat assay

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