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Pathological lesions in lambs fed raw or processed cottonseed meal
D Nagalakshmi1, A K Sharma, V R Sastry
1Division of Animal Nutrition, Indian Veterinary Research Institute, Bareilly, Uttar Pradesh, India.
Veterinary Research Communications
|June 27, 2000
Summary
Cooking or treating cottonseed meal (CSM) with calcium hydroxide or iron significantly reduced its toxicity in lambs. Processed CSM minimized testicular and epididymal lesions, unlike raw CSM which caused severe reproductive damage.
Area of Science:
- Animal Nutrition
- Toxicology
- Reproductive Biology
Background:
- Cottonseed meal (CSM) is a protein-rich feedstuff, but its use is limited by the presence of free gossypol, a toxic compound.
- Gossypol can cause reproductive toxicity, particularly in male animals, affecting testicular and epididymal function.
Purpose of the Study:
- To evaluate the efficacy of different processing methods (cooking, calcium hydroxide, iron treatment) in reducing the toxicity of CSM in lambs.
- To assess the histopathological effects of raw and processed CSM on lamb reproductive organs.
Main Methods:
- Thirty male lambs were fed diets containing 30% de-oiled peanut meal or 40% raw/processed CSM for 180 days.
- CSM was processed by cooking, treatment with calcium hydroxide (Ca(OH)2), or iron (Fe).
- Histopathological examination of testicular and epididymal tissues was performed using haematoxylin and eosin or Perl's Prussian blue staining.
Main Results:
- Raw CSM significantly reduced free gossypol content through processing (0.27% to 0.16-0.21%).
- Lambs fed raw CSM showed severe testicular lesions (absent spermatogonial cells, collapsed tubules) and epididymal degeneration.
- Processing methods, especially cooking and Ca(OH)2 treatment, effectively minimized gossypol toxicity and associated reproductive lesions.
Conclusions:
- Cooking or Ca(OH)2 treatment of CSM effectively mitigates the toxic effects of free gossypol on lamb reproductive health.
- Processed CSM can be safely incorporated into lamb diets at the tested levels, minimizing adverse effects.
- Further research may explore optimal processing parameters and long-term effects of processed CSM.
