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Title: Effect of supplemental tannin on silage quality and animal performance
Author: Taha, Vahel
ISNI:       0000 0004 7656 1453
Awarding Body: Harper Adams University
Current Institution: Harper Adams University
Date of Award: 2015
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Tannin has the ability to reversibly complex with forage protein s . A series of experiments were conducted to test the effect of supplementary chestnut hydrolysable tannin (HT) on a variety of forage s to reduce protein degradability. Experiment 1 in vestigated the effect of additional HT to different forages on ensiling characteristics and rumen degradability. Tannin was applied prior ensiling at either 40g kg - 1 FW high tannin (HiT), or 20g kg - 1 FW low tannin (LT). An inoculant treatment ( L. plantarum ) 10 6 CFUg - 1 FW (Inoc) as a positive control and untreated (W) as a negative control. Water addition was unified by adding 0.5 l kg - 1 FW and forages ensiled for 100d. Addition of tannin reduced (P < 0.01) silage NH 3 - N concentration (42, 49, 56 and 60g kg - 1 TN for HiT, LT, Inoc and W respectively). Tannin supplementation was found to r educe ( P < 0.05) DM and CP effective rumen degradability Experiment 2, evaluated the effect of additional HT (30g kg - 1 DN) to rye grass either at ensiling or feeding on lamb performance. Five experimental treatments were prepared: fresh grass supplemented with HT (30g kg - 1 DM) at ensiling (GET), untreated rye grass silage (G), rye grass silage treated with inoculate (G+I), G plus additional tannin (30g kg - 1 DM) at feeding (G+T) and G+I plus a dditional tannin (30g kg - 1 DM) at feeding (G+I+T). Supplementation with tannin had no effect on lamb performance, however it reduced rumen NH 3 - N concentration in diets receiving tannin (0.14, 0.19, 0.17, 0.17 and 0.14g l - 1 GET G, G+T, G+I and G+I+T, respec tively). In e xperiment 3, lucerne silage was treated with four levels of HT (0, 25, 50 and 75 g kg - 1 DM) and offered ad libitum to single bearing ewes in late pregnancy and early lactation. Additional 25 and 50 g kg - 1 DM HT were found to increase ( P < 0.05) milk yield (2.5, 2.8, 2.6 and 2.4 L d - 1 for 0, 25, 50 and 75g kg - 1 DM respectively) . In conclusion HT reduced protein degradability inside the silage silo and animal rumen, plus increas ed milk yield was observed.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available