Standardized Ileal Digestible Lysine Requirement of 20 to 40-kilogram Philippine Black Tiaong Native Pigs (Sus scrofa domesticus)

Abstract

Twenty growing Philippine black Tiaong native pigs were randomly allotted to 1 of 4 dietary treatments using a randomized complete block design to determine whether there were differences in SID Lys Requirements. There were five (5) replicate pigs per treatment. Diets were formulated with 0.717, 0.865, 1.010, and 1.156% SID Lys, respectively, which corresponded to SID Lys:ME ratios of 2.11, 2.54, 2.97, and 3.40 g/Mcal. All pigs were offered ad libitum intake from d 0 to 35. Overall (d 0 to 35), Philippine black Tiaong native pigs fed with 1.01% SID Lys had better performance than pigs not fed with 1.001%SID Lys. Moreover, pigs fed with increasing % SID Lys had quadratic relationships in ME efficiency at d 0 to 3(P=0.01). However, no significant differences (P>0.05) were observed in carcass and meatquality characteristics. Meanwhile, a quadratic relationship (P=0.02) was observed in the kidney, whereas a linear response (P=0.004) was noted in the liver with increasing graded levels of % SID Lys. Additionally, a quadratic response was observed in the value of gain/pig(P=0.02), feed cost/kg gain (P=0.02), and margin over feed cost (MOFC)/pig (P=0.01) on a live weight basis and there is a linear relationship were revealed in carcass basis (feed cost/pig, P=0.009; feed cost/kg gain, P=0.006) and live weight basis (feed cost/pig, P=0.009). From the results of this study, it is concluded that diets containing 1.01% SID Lys and alysine: ME ratio of 2.97 g/Mcal are recommended for use in the feeding of Philippine black Tiaong native pigs at 20 to 40-kg.