Effects of protein levels in concentrate and roughage sources on feed intake nutrient digestibility and growth performance of crossbred native goats
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The objective of this study was to investigate the effects of protein levels in concentrate and roughage sources on feed intake, nutrient digestibility, rumen fermentation, blood urea nitrogen and growth performance of crossbred native goats. Sixteen crossbred goats (8 males and 8 females), 12–15 months old, average body weight of 18.74±1.8 kg, were used in this experiment. The experiment was arranged in a 2x2 factorial in a randomized complete block design (RCBD). Factor A was assigned for 2 levels of protein in concentrate (12 and 14 %) and factor B was assigned for 2 types of roughage sources (Napier Pakchong 1 silage and Napier Pakchong 1 with leucaena silage at 50:50 with 4 replications in each treatment. All goats were fed concentrate at 1.5 % of body weight and ad libitum of roughage for 60 days. The results showed that levels of protein in concentrate and roughage sources had no interaction on feed intake, ruminal fermentation, blood urea nitrogen and growth performance of crossbred native goats (P>0.05). But the 14 % protein concentrate increased ruminal ammonia nitrogen (P=0.05) and blood urea nitrogen (P=0.006). Used of Napier Pakchong 1 with leucaena silage as roughage sources increased feed intake (P=0.0001), weight gain (P=0.047) and average daily gain (P=0.046). Therefore, it could be concluded that the use of Napier Pakchong 1 with leucaena silage (50:50) as roughage sources could increase feed intake and growth performance of crossbred native goats and could reduce protein levels in concentrate without altering on growth performance of crossbred native goats.
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