Requirement for Metabolizable Energy of Philippine Black Tiaong Native Pigs (Sus scrofa domesticus) from 20 to 40-Kilogram

Abstract

The objective of the study was to determine the ME requirement of growing Philippine black tiaong native pigs from 20 to 40-kg. Twenty growing Philippine black tiaong native pigs were blocked by initial weight and gender and were randomly allotted to 1 of 4 dietary treatments using a randomized complete block design. There were 5 replicate pigs per treatment. Diets were formulated with 3.1, 3.2, 3.3, and 3.4 Mcal ME/kg, respectively, corresponding to a standardized ileal digestible (SID) Lys:ME ratio of 2.97 g/Mcal. Overall (d 0 to 35), ADG and final BW was unaffected by ME level; however, there was a tendency (P=0.07) for a linear decrease in ADFI and a linear improvement in F/G with increasing ME. Average backfat thickness and 10th rib fat depth linearly increased (P<0.02) with increasing ME of the diet. A linear (P<0.02) decrease in SFFL was observed as ME level increased from 3,100 to 3,400 kcal/kg. There is, however, a tendency (P=0.09) for an increase in marbling score as diet ME levels increased and an increase (quadratic, P<0.05) in L* value. Overall, there were no significant differences (P>0.05) observed in absolute and relative organ weights as the ME levels increased from 3.1 to 3.4 Mcal/kg. In conclusion, the ME requirement for maximum F/G for growing Philippine black tiaong native pigs between 20 to 40 kg is 3.4 Mcal ME/kg, when diets are formulated at standardized ileal digestible Lys:ME ratio of 2.97 g/Mcal.