In sacco degradation characteristics of energy feed sources in Brahman-Thai native crossbred steers
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Abstract
In sacco degradability were determined in some commonly used energy feed sources in ruminant rations. Ingredients evaluated were; cassava chip, ground corn, broken rice, rice bran and rice pollard. In sacco studies were conducted in two rumen fistulae Brahman-Thai native crossbred steers. The steers were fed at 0.5% body weight of concentrate and rice straw on ad libitum. Nylon bags containing 5 g (as fed basis) of each feed was immersed in duplicate at each time point in the ventral rumen of each steer for 2, 4, 6, 12, 24 and 48 hours. The data were fitted to the equation P = a+b (1-e-ct) and effective degradability’s were calculated using a theoretical rumen out flow rate of k = 0.05/hour. It was found that the rapid soluble fractions (a) of DM (75.08%), OM (77.79%) and CP (60.06%) were highest (P<0.01) in cassava chip. The potentially degradable fraction (b) of DM (86.65%), OM (86.98%) and CP (82.56%) were highest (P<0.01) in broken rice. The rate c of DM (0.182 h-1) and OM (0.178 h-1) were fastest (P<0.01) in rice bran. The effective degradability of DM (83.82%), OM (81.59%) and CP (77.23%) were highest in cassava chip (P<0.01). It was concluded that energy sources vary in rumen degradability. This would provide information on combinations of energy and protein sources with similar ruminal degradation, and thus improve ruminant feeding values.
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