[The effect of moisture content and particle size on physical properties of local feedstuff: angle of response floating rate and hygroscopic factors]
1999
Khalil (Institut Pertanian Bogor (Indonesia). Fakultas Peternakan)
The objectives of the experiment were to measure three kinds of physical properties (angle of response, floating rate, and hygroscopic factor) of local feedstuff and to study the effect of moisture content and particle size on the physical properties. Twenty five kinds of feedstuff which were divided in 5 groups according to their nutritional function in the animal diet and obtained from local producers or market were used as samples in the experiment. The feed samples of about 27 kg each were prepared by grinding into 3 different particle sizes, i.e. normal, medium, (screen : 3 mm) and small (1 mm). The particle size was not changed for the meal-form feedstuff. The feed of each particle size were then subdivided into 3 groups and their moisture content was adjusted into 3 different levels, i.e. normal, high (2 percent higher than the normal) and low (2 percent lower than the normal). After that, the physical properties were measured for 3 times as replications. The data were statistically analyzed by using variance analysis in a completely randomized factorial design. The mean value were then compared by using least significant different (P lower than 0.05). The results of the experiment showed that energy feed sources in the normal form had the lowest mean value of angle of response (20.2 degree) with the highest coeficient of variation (cv) (76.7 percent). The highest mean value of angle of response was on the contrary found in forages and roughages (37-57 degree) with the cv value of 20.5 percent. Some energy and plant protein feed sources (rice brand, cassava pulp, coconut meal, rubber seed meal and kapok seed meal) had high value of higroscopic moisture content and particle size. In general, the value of angle of response, floating rate and higroscopic factor increased significantly, when the moisture content and particle size of the feedstuff were reduced
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