Effects of Anti-Nutritional Compounds in Pongamia Seedcake on Intake, Digestion, and Ruminal Fermentation in Beef Cattle
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Effects of increasing levels of the anti-nutritional compounds karanjin and pongamol on intake, nutrient utilization and ruminal fermentation were evaluated with a growing diet (trial I) and a forage diet (trial II). Steers had ad libitum access to growing diet and Bermuda grass hay during trial 1 and trial 2, respectively. At the same time diets were fed, steers received their allocated doses of karanjin and pongamol via ruminal cannula to determine acceptable inclusion level of pongamia seedcakes containing varying levels of karanjin and pongamol, which are contained in the residual oil of commercially available pongamia seedcakes. Twelve steers in both studies were assigned to completely randomized block design consisting of a control (no karanjin and no pongamol) and one of 3 levels of karanjin and pongamol. Dosing increasing levels karanjin and pongamol linearly (P < 0.01) decreased intake in Trial 1. No significant effects (P ≥ 0.12) were observed for total DMD, OMD, NDFD, ADFD and CPD. Ruminal total VFA concentration and pH were not affected by inclusion levels (P = 0.19 and P = 0.51, respectfully). The lowest dose of karanjin and pongamol resulted in a greater (P < 0.01) molar proportion of propionate than other treatments, resulting in a reduction in acetate:propionate ratio (P = 0.02) for that treatment. Among all VFA molar concentration measurements, only isobutyrate exhibited a treatment × hour effect (P = 0.02). When a forage diet was fed (Trial 2) increasing levels of karanjin and pongamol dosing resulted in a quadratic decrease (P < 0.05) in intake of total DM, OM, NDF and ADF with the. Crude protein intake did not differ (P = 0.14) among treatments. There was no effect (P ≥ 0.22) among treatments on DMD, OMD, NDFD and ADFD. Total VFA concentration and ruminal pH were not affected by inclusion level (P = 0.59 and 0.72, respectively. Therefore, acetate:propionate ratio also had no treatment effect (P = 0.84). Increasing levels of karanjin and pongamol decrease intake, although digestibility is not impacted. Ruminal fermentation of steers fed with complete ration is slightly altered with karanjin and pongamol intake, however, none alteration was observed when steers were fed only Bermuda grass hay.
SubjectBeef cattle nutrition
Briani, Vinicius Papin (2017). Effects of Anti-Nutritional Compounds in Pongamia Seedcake on Intake, Digestion, and Ruminal Fermentation in Beef Cattle. Master's thesis, Texas A & M University. Available electronically from