The effect of phenological stage and season on nutritive value, chemical composition and nutrient digestibility of lucerne (Medicago sativa L.) green forage in the alimentary tract of cattle
Niwinska, B.(Research Inst. of Animal Production, Balice (Poland). Dept. of Animal Nutrition) | Strzetelski, J.A.(Research Inst. of Animal Production, Balice (Poland). Dept. of Animal Nutrition)E-mail:[email protected] | Kowalczyk, J.(Polish Academy of Sciences, Jablonna near Warsaw (Poland). The Kielanowski Inst. of Animal Physiology and Nutrition) | Borowiec, F.(Agricultural Univ., Cracow (Poland). Dept of Animal Nutrition) | Domanski, P.(Research Centre for Cultivars Testing, Slupia Wielka (Poland))
Green forage of fourteen lucerne varieties was harvested in these stages: the first growth in the budding stage (cut I), re-growths in the pre-bloom stage of maturity (cut II) 35 days after the first cut, and the next cut, 42 days later (cut III). Three bulls equipped with rumen and duodenal cannulas were used to study rumen degradability by the nylon bag technique and intestinal digestibility by the mobile bag method. Phenological stage and temperature during vegetation influenced the chemical composition of different cuts. The stage of maturity of the lucerne influenced the rate of digestibility of dry matter and cell content along the alimentary tract, but this effect was not significant for crude protein, crude fibre, neutral detergent fibre, acid detergent fibre, cellulose and hemicellulose.
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