PSVIII-29 - Nutritional evaluation of frost damaged whole plant faba bean for hay: Effect of variety/tannin level on feed and feeding values in ruminant livestock systems
Wednesday, July 22, 2020
7:00 AM – 5:00 PM
Location: Poster Sessions
The objective of this study was to determine the effect of tannin level/variety (low tannin/Snowdrop variety; high tannin/SSNS-1 variety) on chemical and energy profiles, CNCPS fractions, rumen degradation kinetics of principal nutrients, nitrogen-to-energy degradation ratios, in vitro intestinal digestibility, metabolic characteristics, and predicted production performance of frost damaged whole plant faba bean hay harvested at 114 days of maturity. The CRD and RCBD with one-way treatment arrangement were used. Data were analyzed using the mixed model procedure of SAS version 9.4. The results showed that high tannin frost damaged hay had higher (P < 0.05) organic matter (OM) and lower acid detergent insoluble CP (ADICP) than low tannin frost damaged hay (+2.5 and -0.4%DM). Starch and protein contents in this stage of maturity averaged (11.9%DM and 16.8 %DM). Energy values were similar (P > 0.10), while high tannin hay had higher (P < 0.05) fiber-bound protein (PB2) and lower (P < 0.05) indigestible protein (PC, +2.3 and -3.1%CP). Low tannin frost damaged faba hay had higher (P < 0.05) rumen undegraded crude protein (RUP, +2.8%) and lower undegradable fraction of neural detergent fiber (U, -5.7%) than high tannin frost damaged faba hay. High tannin frost damaged hay had higher (P < 0.05) intestinal digested rumen bypass DM (IDBDM) (+15 g/kg DM), higher (P < 0.05) intestinal digestibility of rumen bypass protein (dIDP, +7 %), higher metabolizable protein (MP, +4 g/kg DM) and higher Feed Milk Value (FMV, +90 g milk/kg DM Hay) than low tannin frost damaged hay. In conclusion, both high tannin and low tannin frost damaged hay had lower nutritive value than non-frost damage hay at flower stage at 77 days, mid-pod stage at 88 days and late pod stage at 97 days. The high tannin frost damaged whole plant faba bean hay showed superior nutritive value than the low tannin frost damaged faba hay.