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Digestibility of a forage is very important as it contributes to the energy and protein values and intake potential of the feed in ruminant production systems. The silages used in this digestibility trial present the range of variation encountered in practice of forages used within Finland: early cut grass (EG), late cut grass (LG), red clover (Trifolium pretense, RC) and whole-crop barley (Hordeum vulgare, WCB). Grass silages were a mixture of timothy (Phleum pretense) and meadow fescue (Festuca pratensis). EG, LG, RC and WCB were cut on 13 June (2006), 3 July (2006), 29 June (2006) and 2 August (2006), respectively. Grass and clover silages were wilted for 1 day and all silages were ensiled with AIV 2, and ensiled in round bales. Four rams (Dorset and Finnsheep × Texel crossbred) were used to estimate digestibility in a 4 × 4 Latin square experiment with four 3-week experimental periods. The total digestibility was determined using total collection method by measuring daily forage intake and the amount of faeces excreted over the last 7 days of each period. All silages were well preserved and had relatively high DM concentration, within 395 566 g/kg. The ash concentration in EG, LG, RC and WCB was 88, 70, 97 and 62 g/kg DM. The respective CP concentrations were 180, 113, 163, 71 g/kg DM and NDF concentrations were 509, 623, 385and 548 (g/kg DM). The organic matter digestibility for EG, LG, RC and WCB was 0.751, 0.608, 0.645 and 0.618. There was a 20 day difference in the cutting dates of EG and LG resulting in 0.008 unit decrease in organic matter digestibility per day. Neutral detergent fibre digestibility was highest for early cut grass silage (0.74). and lowest for red clover (0.50) and whole-crop barley (0.51). Forages vary greatly in their digestibility depending on species and maturity as shown by the results of the current study. The great variation emphasizes the importance of accurate routine digestibility analysis and need to analyze farm silages for ration formulation.

In vivo digestibility of different types of forages using sheep as a model of ruminants