A note on evaluation of wet and dry brewers’ grains in concentrate supplements for growing Anglo-Nubian x Fiji local goats in the tropical environment of Samoa
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The University of the South Pacifc, School of Agriculture, Animal Science Department, Alafua Campus Apia, Western Samoa
Publication date: 2002-10-11
J. Anim. Feed Sci. 2002;11(4):565-575
Six Anglo-Nubian x Fiji local goats between 7-10 months of age, pre-experimental average body weight (BW) of 11.8 kg were randomly divided into two groups on the basis of body weight. These were used in a change-over experimental design with two 28-days periods, separated by a 7-day adaptation period. Each group of three goats were used to study the potential value of dry or wet brewers’ grains in concentrates on feed intake, growth rate, feed efficiency and apparent nutrient digestibility. Dry brewers’ grains (DBG) based concentrate had a higher (P<0.05) DM content than that of the concentrate based on wet brewers’ grains (WBG). The carbohydrate fractions (NDF, ADF and hemicellulose) but not ADL and cellulose were significantly higher (P<0.05) in the DBG based concentrate than in the WBG concentrate. Non-structural carbohydrate (NSC) was slightly higher in the WBG concentrate than in the DBG based concentrate. Both concentrates had similar gross energy (MJ/kg DM) contents. The forage (Guinea grass) had high moisture content and moderate protein. Concentrate intake was higher (P<0.05) in the goats on the WBG compared to those on DBG, however forage intake was similar in both groups. Total feed intake (concentrate + forage) was not significantly different (P>0.05) from each other. Dry matter intakes for DBG and WBG concentrates were 44 and 45 g/kg BW0.75, respectively. Average daily gains were similar in the goats offered either DBG or WBG concentrates. Feed efficiency (feed/gain) was similar in both groups. Protein efficiency and energy efficiency of the goats on either DBG or WBG were 2.6 and 2.9; 4.4 and 4.1, respectively. The digestibility of DM, NDF and GE were significantly higher (P<0.05) in the goats on DBG based concentrate than those on WBG. Results of this study suggested that the goats fed either DBG or WBG based concentrates have comparable liveweight gains, feed efficiency and digestibility of CP, ADF, OM and NFE. In conclusion this study has demonstrated that brewers’ grains either in the dry or wet form has a potential as feed ingredient in diets for the goats in the tropical environment of Samoa.
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