Document Detail

Nutritional value and physiological effects of soya-free diets fed to rats during growth and reproduction.
MedLine Citation:
PMID:  18184381     Owner:  NLM     Status:  MEDLINE    
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.
B Pastuszewska; M Taciak; A Ochtabińska; A Tuśnio; T Misztal; K Romanowicz; A Morawski
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of animal physiology and animal nutrition     Volume:  92     ISSN:  1439-0396     ISO Abbreviation:  J Anim Physiol Anim Nutr (Berl)     Publication Date:  2008 Feb 
Date Detail:
Created Date:  2008-01-10     Completed Date:  2008-03-17     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  101126979     Medline TA:  J Anim Physiol Anim Nutr (Berl)     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  63-74     Citation Subset:  IM    
The Kielanowski Institute of Animal Physiology and Nutrition, Polish Academy of Sciences, Jabłonna, Poland.
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MeSH Terms
Animal Feed
Animal Nutritional Physiological Phenomena
Dietary Proteins / administration & dosage*
Dose-Response Relationship, Drug
Luteinizing Hormone / blood
Nutritive Value
Organ Size / drug effects
Prolactin / blood
Random Allocation
Rats, Wistar / growth & development*,  physiology*
Reproduction / drug effects,  physiology*
Soy Foods*
Testosterone / blood
Weight Gain
Reg. No./Substance:
0/Dietary Proteins; 58-22-0/Testosterone; 9002-62-4/Prolactin; 9002-67-9/Luteinizing Hormone

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