Graduate Thesis Or Dissertation
 

Involvement of inorganic and organic components in the laxative effect of cane final molasses

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  • The objective of this study was to investigate the effect of inorganic and organic components of molasses on the laxative problem encountered when molasses makes up a large portion of livestock rations. In a series of four trials 280 male Long Evans rats weighing approximately 50 grams each were placed on dietary treatments, each supplying or removing a possible causative agent. In the first trial the involvement of inorganic components and in particular potassium was studied in their relation to the laxative effect. Potassium when supplied at a level calculated to be equivalent to the content of molasses did not cause any laxative effect. However, it did result in increased water consumption by rats. The addition of molasses ash to the diet did not cause any laxative effect in the rats but did cause increased water consumption as did the potassium. The second trial was designed to scan other factors which might be involved in the laxative problem. Magnesium when supplied as MgSO₄ at a level calculated to be equivalent to the magnesium concentration of the molasses-supplemented diet did cause loose droppings in all rats receiving that diet. The results of the third trial were quite variable, mainly due to poor experimental technique and were not considered in the final conclusions. The trial pointed out several areas where experimental technique could be refined. The fourth trial showed that magnesium when supplied as dicalcium magnesium aconitate at a level calculated to be equivalent to its concentration in the molasses-supplemented diet produced dry matter values of the large intestinal content similar to the rats on the molasses-supplemented diet. However, the wet weight of large intestinal contents of rats receiving the dicalcium magnesium aconitate diets was significantly (P < 0.01) less than that of the rats on the molasses containing diet, but significantly (P < 0.05) more than that of the rats on the basal diet. The addition of potassium to the dicalcium magnesium aconitate diet did not affect the dry matter or wet weight of the large intestinal contents of the rats. It did, as before, cause an increased water consumption by the rats on the high potassium diets. Rats on the deionized molasses and cation-free molasses showed significantly (P < 0.05) higher dry matter values for the contents of the large intestine over the dry matter values recorded on the rats on the molasses diet, but still below the value recorded for the rats on the basal diet. The rats on the anion-free molasses showed no differences in dry matter of large intestinal contents from those rats on the molasses containing diet. Wet weight of large intestinal contents of the rats was significantly (P < 0.01) reduced by the cation-free molasses and deionized molasses. The wet weight of the contents of the large intestine of the rats on the dicalcium magnesium aconitate diet was significantly (P < 0.05) increased over that of the rats on the basal diet but was significantly (P < 0.01) less than that of the rats on the molasses-supplemented diet.
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