Apparent digestibility of nine conventional feed ingredients for Onchidium struma

Abstract:

The apparent digestibility of dry matter, crude protein, crude fat, crude fiber, amino acids, calcium and phosphorus of nine feed ingredients for Onchidium struma were determined. Taking spirulina feed as the basal diet, test diets consisted of 70% basal diet and 30% test feed ingredients, and added 0.5% Cr₂O₃ as an indicator. Two thousand four hundred Onchidium struma with the average body weight of (16.82±2.14) g were randomly divided into 10 groups with 3 replicates per group and 40 individuals per replicate, and one control group randomly selected from the 10 groups was fed basal diet. The results showed that the apparent digestibility for dry matter, crude protein, crude fat, crude fiber, total amino acids, essential amino acids, calcium and phosphorus of nine feed ingredients were 33.24%-55.29%, 27.30%-79.35%, 36.91%-69.81%, 34.89%-65.04%, 25.35%-75.78%, 21.54%-72.57%, 44.98%-74.64% and 10.42%-32.15%, respectively. The results indicated that corn gluten meal showed the best apparent digestibility for all nutrition in the seven protein feed, followed by cottonseed gluten meal and cottonseed meal. In the two energy feed, corn meal showed higher apparent digestibility than wheat meal, but lower than the corn gluten meal. Thus, it can be seen that corn gluten meal can be used as high quality feed raw material, and it can partially replace spirulina feed in Onchidium struma feeds. At the same time, we can also reasonably collocate and moderately use corn meal and cottonseed gluten meal.