Influence of different sources of starch on digestibility of nutrients and balance of nitrogen in young bulls
2006
Šimko, M.,Slovak Univ. of Agriculture in Nitra (Slovak Republic) | Pajtáš, M.,Slovak Univ. of Agriculture in Nitra (Slovak Republic) | Bíro, D.,Slovak Univ. of Agriculture in Nitra (Slovak Republic) | Juráček, M.,Slovak Univ. of Agriculture in Nitra (Slovak Republic) | Gálik, B.,Slovak Univ. of Agriculture in Nitra (Slovak Republic)
A study was carried out to determine the effects of various concentrates, i.e. different sources of starch with a constant ratio to fibre (2.1: 1) and the same percentage of fibre in dry matter of feed rations (16-17 percent), on balance nutrient digestibility and nitrogen balance. Experiment involved six Black-Spotted bulls with mean live weight of 304 kg, which were offered diet twice a day - at 06.00 and 18.00. A base of feeding ration was meadow hay, supplemented with wheat meal (treatment a), or maize meal (treatment c), or their combination at a 1:1 ratio (treatment b). An 11-day adaptation period was followed by an 8-day experimental period. From variants of feeding were taken samples of feedstuffs, in which was determined content of nutrients by Order of MP SR Nr. 1497/4/1997-100 (MP SR, 1997). During experimental period was quantitative batched excrements and urine. From collected amount for 24 hour were taken average samples for chemically analyses on the content of nutrients (MP SR, 1997). Significance of differences between feed rations was evaluated by t- test with program Statgraphics, Version 5.0. Digestibility of dry matter (72 percent), organic matter (74 percent) and fibre (52 percent) was observed for wheat meal combined with maize meal. Most crude protein (69 percent) showed significant apparent digestibility when bulls were offered wheat meal, but their effectiveness was higher significantly for wheat meal combined with maize meal. The highest percentage of nitrogen retained out of both N intake and digested nitrogen was found in this experiment with feeding wheat meal combined with maize meal (treatment b).
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