Energy Utilization of Complete Feed with Different Protein-Energy Levels in Male Local Lamb on Feedlot System

Abstract

59 Energy Utilization of Complete Feed [E. Purbowati et al.] Not all of energy consumed by animal can be digested and utilized by body but some of them will be expelled through feces, urine, methane and heat increment. The objective of the research was to study the energy utilization of complete feed with different protein-energy levels in male local lamb on feedlot system. Twenty four males local lamb, aged around 3 – 5 months with the average body weight of 8,7 – 15,5 kg were used in this experiment. A generalized randomized (completely) block design was used in this study. The complete feed treatments were R1 (CP 14.48% and TDN 50.46%), R2 (CP 17.35% and TDN 52.61%), R3 (CP 15.09% and TDN 58.60%), and R4 (CP 17.42% and TDN 57.46%). The ANOVA was used to analyze data and any differences among groups were further tested using Duncan’s Multiple Range Tests (DMRT). The results showed that the Average Daily Gain (ADG) of lamb fed complete feed treatments were not significantly different (P>0.05) i.e. 145.22, 164.98, 154.92 dan 152.02 g, respectively for R1, R2, R3 and R4. Dry matter (DM) intake of lamb of R1 (937.08 g) and R2 (942.72 g) significantly higher (P<0,05) than these of R3 (796.54 g) and R4 (827.08 g), but digestible dry matter of R1 (48.85%) dan R2 (50.89%) significantlyഊlower (P<0,05) than these of R3 (60.49%) dan R4 (59.77%). The energy intake were not significantly different (P>0.05) among the treatments. Energy intake of R1, R2, R3 and T4 were 12,80, 12,30, 11,46 dan 10,74 MJ, respectively. Digestible energy (DE) and metabolizable energy (ME) (% energy intake) of R1 (52.26 and 45.25%) and R2 (53.52 and 45.03%) were lower (P<0,05) than those of R3 (63.46 and 52.64%) and R4 (64.11 and 58.45%). It was concluded that energy utilization of complete feed with crude protein (15.0 and 17.5%) and energy (50 and 60% TDN) combination in male local lamb on feedlot system were relatively the same. Keywords: energy Utilization, Complete Feed, Different Protein-Energy Levels, Feedlot, Local Lamb