The effects of either dietary additions or intraruminal infusion of amines and juice extracted from grass silage on the voluntary intake of steers offered grass silage

Dawson, L.; Mayne, C.S.

Animal Feed Science and Technology 56(1-2): 119-131


ISSN/ISBN: 0377-8401
DOI: 10.1016/0377-8401(95)00809-2
Accession: 002984850

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An experiment was carried out to assess the possible role of amines and other end products of silage fermentation on food intake of steers. In total, 6 treatments were examined in a 9 period changeover design experiment with 4 steers, mean live weight 520 kg, fitted with rumen cannula. Each period was one week long. The 6 treatments comprised putrescine (P); cadaverine (C); gamma amino butyric acid (GABA); putrescine + cadaverine + gamma amino butyric acid (P + C + GABA); expressed juice from grass silage (S); water (W) control. These were either added to the diet (D) or infused directly into the rumen (I). Amines were applied at a rate of 2 g kg-1 DM and were dissolved in water for infusion and addition to the diet. The basal diet consisted of a restricted fermentation grass silage, from which juice was expressed prior to feeding using a hydraulic press. Within each 7 day period, animals were offered a standard silage for the first 4 days following which treatments were applied for 3 days, with total dry matter intake recorded each day of the 3 day treatment period. On day 2, intakes were measured at 5 min intervals for the first 3 h following feeding and every 2 h for the next 10 h. Dry matter intakes (g kg-1 LW) for each of the treatments were as follows: 10.2 (W,I); 10.9 (W,D); 11.6 (S,I); 12.1 (S,D); 9.0 (GABA,I); 10.5 (GABA,D); 10.8 (P,I); 10.4 (P,D); 12.2 (C,I); 10.4 (C.D); 11.0 ((P + C + GABA),I); 10.3 ((P + C + GABA),D); SEM = 0.780. These results indicate that intraruminal infusion or dietary addition of amines, GABA or silage juice at levels up to 2 g kg-1 DM, had no significant (P gt 0.05) effect on the voluntary food intake of steers offered grass silage.