Protein quality and metabolizable energy of sunflower and rape seed meals
2001
Boonlom Cheva-Isarakul(Chiang Mai University, Chiang Mai (Thailand). Faculty of Agriculture. Department of Animal Science) | Weerasak Samart(Chiang Mai University, Chiang Mai (Thailand). Faculty of Agriculture. Department of Animal Science) | Suchon Tangtaweewipat(Chiang Mai University, Chiang Mai (Thailand). Faculty of Agriculture. Department of Animal Science)
Sunflower meal (SFM) contained lower CP than rape seed meal (RSM) and soybean meal (SBM, 28.7 vs. 37.8 and 46.3 percent DM) but higher CF (29.5 vs. 11.8 and 7.6 percent DM). RSM contained lower EE than SFM and SBM (1.0 vs. 5.4 and 7.9 percent DM) therefore it had lower gross energy content than the other two meals (4.5 vs. 4.8 and 5.1 kcal/g DM). The digestibility trial was conducted in 4 artificial anus cocks and 4 normal cocks. It revealed that the true digestibility of most nutrients (DM, CP, EE, NFE and OM) in SBM were significantly higher than SFM and RSM. Artificial anus cocks showed higher digestibility of DM, CP, NFE and OM while that of CF was lower than the normal cocks. However that of EE had no significant difference. True digestible energy (TDE) was found to be higher than ADE. True metabolizable energy (TME) was also higher than AME with regardless of chicken types. The energy value of SBM was significantly higher than SFM and RSM. The TME values of the 3 feedstuffs are 3.7 vs. 2.8 and 2.2 kcal/g DM, respectively. Protein quality of SFM and RSM was evaluated using 80 heads of 7 days old chicks and 20 heads of 3 weeks old albino rats. Each kind of animals was divided into 4 dietary groups (including casein and N-free diets). It was found that RSM and SFM had similar protein quality. Their Protein efficiency ratio (PER) values were 1.4 vs. 1.0 and Net protein retention (NPR) were 2.9 vs. 2.9. These values determined in chicks were significantly higher than in rat (PER=1.5 vs. 0.9 and NPR=3.4 vs. 2.3, respectively).
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