Monday, 20 June 2005 - 3:50 PM
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The comparative intake and nutritive digestibility of four legume/grass hays in horses.

Arianne Bastian and Leonard C. Gagnon. Montana State University, 119 Linfield Hall, Bozeman, MT 59718

The preference for feeds shown by animals in selecting one feed over another is only important if the preferred hay type is consumed in larger quantities, further digested, or both. Four legume/grass hay blends (orchardgrass/sainfoin, orchardgrass/alfalfa, timothy/sainfoin, timothy/alfalfa) were used in both digestibility and preference trials to determine the digestibility of the hays and to determine if a preference existed between hay types. Studies were conducted for horses (Equus sp.). The digestibility trial consisted of four geldings while the preference trial was completed twice using one set of six geldings and one set of six mares. It was found that orchardgrass/sainfoin was significantly different in digestibility from as-fed hay analyses (P = 0.0001). Timothy/alfalfa was found to be significantly different in digestibility from fecal sample analyses (P = 0.0012). Geldings consumed more alfalfa hay blends than sainfoin hay blends (P = 0.0004). Geldings chose alfalfa blends first, followed by orchardgrass blends. The alfalfa hay blends were less digestible but hay composition ratios determined that there was a larger amount of grass in the alfalfa blends. Mares consumed more orchardgrass hay blends than timothy hay blends (P = 0.0239). Mares chose orchardgrass blends first, followed by alfalfa blends. The orchardgrass blends were less digestible than the timothy blends but hay composition ratios determined that there was a greater amount of grass in the orchardgrass blends. Horses did not correlate preferences with the most digestible hay blend. Horses did, however, exhibit a preference for one feed type over another.

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