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2011, vol. 27, br. 4, str. 1563-1569
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Procena parametara kvaliteta crvene deteline (Trifolium pratense L.) u zavisnosti od faze razvića
Estimation of red clover (Trifolium pratense L.) forage quality parameters depending on the stage of growth
Projekat: Poboljšanje genetičkog potencijala i tehnologija proizvodnje krmnog bilja u funkciji održivog razvoja stočarstva (MPNTR - 31057)
Sažetak
Cilj ovog rada je bio ispitivanje promena hranljive vrednosti crvene deteline (Trifolium pratense L.) sorte K-27 u različitim fazama razvića u drugom i trećem otkosu. Uzorci iz različitih faza razvića: sredina butonizacije, oko 60% cvetanja i puno cvetanje su ispitivani na sadržaj sirovih proteina, neutralne deterdžent celuloze, kisele deterdžent celuloze, svarljive suve materije, konzumiranja suve materije, relativne hranljive vrednosti, ukupnih svarljivih hranljivih materija, neto energije laktacije, neto energije za održavanje i neto energije prirasta. Veći sadržaj sirovih proteina (262,1 g kg-1 SM) je ustanovljen u trećem, nego u drugom otkosu (od 260,8 kg-1 SM) u prvoj fazi razvića. Sadržaj ukupnih svarljivih hranljivih materija, svarljivosti suve materije, konzumiranja suve materije, relativne hranljive vrednosti, neto energije laktacije, neto energije za održavanje i neto energije prirasta su izračunate prema odgovarajućim formulama za kabasta hraniva. Ustanovljeno je da faza razvića ima značajan uticaj na hemijski sastav i relativnu hranljivu vrednost crvene deteline. Dobijeni rezultati pokazuju da adekvatna faza razvića za košenje crvene deteline može biti sredina cvetanja kada je sadržaj sirovih proteina, NEl, NEm i NEg visok.
Abstract
The objective of this study was to investigate the changes that take place in nutrient values of red clover (Trifolium pratense L.) cv K-27 at different stages of growth in the second and the third cut. The samples from different stages of growth: mid-bud stage, around 60% flowering and full flowering were investigated for crude protein (CP), neutral detergent fiber (NDF), acid detergent fiber (ADF), digestible dry matter (DDM), dry matter intake (DMI), relative feed value (RFV), total digestible nutrients (TDN), net energy-lactation (NEl), net energy-maintenance (NEm) and net energy-gain (NEg) content. Higher content of crude protein was found in the third cut (262.1 g kg-1 of DM) than in the second cut (260.8 g kg-1 of DM) in the first stage of development. TDN, DDM, DMI, RFV, NEl, NEm and NEg were calculated according to the appropriate equations adapted from common formulas for forages. The stage of plant development has a significant influence on the chemical composition and the relative feed value of red clover. The achieved results show that adequate maturity stage for cutting might be at mid-bloom stage, when crude protein content, NEl, NEm and NEg content are high.
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