Relationship between yield and energy value of the first cut of individual grass and legume species for ruminants | Povezava med pridelkom in energijsko vrednostjo posameznih vrst trav in metuljnic prve kosnje za prezvekovalce
2010
Znidarsic, T., Agricultural Institute of Slovenia, Ljubljana (Slovenia). | Verbic, J.
The aim of the research was to find out what concentrations of net energy for lactation (NEL) can be obtained by individual grass and legume species at dry matter yields characteristic for different types of grassland use. On the basis of 93 samples of the first cut of the orchard grass, 82 and 81 samples of Italian and perennial ryegrass, 35 and 13 samples of meadow and tall fescue, 66 samples of timothy grass, 87 samples of alfalfa, 12 samples of birdsfoot trefoil and 22 samples of red clover, regression relationships between dry matter yield (PSS) and NEL concentration were studied. Dry matter (DM) and NEL concentration were determined by the method of near infrared reflectance spectroscopy (NIRS) using the calibration equations that were developed on the basis of in vitro gas production test with rumen liquor. On the basis of regression equations, NEL concentrations at yields characteristic for grazing (1500 kg DM/ha), green forage (2000 kg DM/ha), silage (3500 kg DM/ha) and hay (4000 kg DM/ha) were determined. The highest NEL concentrations at yields characteristic for grazing, green forage, silage and hay were obtained by samples of Italian and perennial ryegrass (6.77, 6.72, 6.58, 6.53 and 6.75, 6.70, 6.57, 6.53 MJ/kg DM, respectively). The lowest NEL concentrations among grasses were observed with the samples of tall fescue (6.11, 6.06, 5.91, 5.86 MJ/kg DM). The decreasing of NEL concentration for Italian and perennial ryegrass was slower compared to other grass species. In legumes the decrease in NEL concentration by increasing the DM yield was not significant. The concentrations of NEL at yields characteristic for silage were 5.93, 5.54, 5.45 MJ/kg DM for red clover, alfalfa, and birdsfoot trefoil, respectively.
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