Olgunlaşma Döneminin Teff Otunun Potansiyel Besleme Değeri, Gaz ve Metan Üretimine Etkisi
Bu çalışmanın amacı; farklı olgunlaşma dönemlerinde (çiçeklenme öncesi, çiçeklenme ve tohum bağlama) hasatedilen teff otunun potansiyel besleme değerine, gaz ve metan üretimine olan etkisini belirlemektir. Hasat edilen bitkilertartılarak yeşil ot verimi, 70 °C’de kurutularak kuru ot verimi belirlenmiş ve kimyasal kompozisyonu belirlemek içinanalizler yapılmıştır. Yem örnekleri yirmi dört saatlik inkübasyona tabi tutularak gaz ve metan üretimleri belirlenmiştir.Olgunlaşma döneminin teff otunun kimyasal özelliklerine, gaz ve metan üretim miktarına, metabolik enerji (ME) veorganik madde sindirim derecesine (OMS) etkisi çok önemli derecede (P≤0.01) olmuştur. Olgunlaşma dönemininilerlemesiyle yeşil ve kuru ot verimleri, nötr deterjanda çözünmeyen lif (NDF) ve asit deterjanda çözünmeyen lif(ADF) oranları artarken, ham protein, ham yağ ve ham kül içerikleri azalmıştır. Tef bitkisinin yeşil ve kuru ot verimlerisırasıyla 576.91-1061.78 ve 198.54-637.03 kg/da arasında değişmiştir. Ham protein içeriği %6.7-20.7, ham yağ içeriği%1.33-2.72, ham kül içeriği %6.78-8.70 arasında değişmiştir. Teff otunun NDF ve ADF içerikleri sırasıyla %60.36-69.49 ve %30.79-38.09 arasında değişmiştir. Teff otunun olgunlaşma döneminin ilerlemesi yirmi dört saatlik gaz vemetan üretimlerini önemli ölçüde azaltmıştır. Yirmi dört saatlik gaz ve metan üretimleri sırasıyla 25.83-35.50 ml ve3.97-5.43 ml arasında değişmiştir. Teff otunun metabolik enerji ve organik madde sindirim derecesi sırasıyla 5.74-7.10MJ/kg kuru madde ve %37.80-46.24 arasında değişmiştir. Sonuç olarak, olgunlaşma döneminin ilerlemesiyle birlikteteff bitkisinin besleme değeri düşmüştür. Teff otunun çiçeklenme öncesi ve çiçeklenme döneminde ham protein oranıve metabolik enerji kapasitesinin yüksek olmasından dolayı otlatılması veya hasat edilmesi önerilebilir
Effect of Vegetative Stages on Potential Nutritive Value, Gas Production and Methane of Teff Hay
The aim of the current experiment was to determine the effect of harvesting stage on the potentialnutritive value, gas and methane production. Teff plant was harvested at three maturity stages (before flowering,flowering and seeding). The green and dry hay yield of teff plants were determined by drying at 70 oC. Someanalysis was carried out to determine the chemical composition of teff plants. The gas and methane production wasdetermined after 24 h incubation. Harvesting stage had a signifcant (P≤0.01) effect on chemical composition, gasproduction, methane production and organic matter digestibility. The green and dry hay yield, neutral detergentfber (NDF) and acid detergent fber (ADF) contents were increased with advancing maturity whereas crude protein,ether extract and crude ash contents were decreased. The green and dry hay yield of teff plant ranged from 576.91 to1061.78 and 198.54 to 637.03 kg da-1 respectively. Crude protein content of teff plants ranged from 6.7 to 20.7 %,ether extract from 1.33 to 2.72 % and crude ash 6.78 to 8.70 %. The NDF and ADF contents of teff plants rangedfrom 60.36 to 69.49 % and 30.79 to 38.09 %. The gas production and methane production at 24 h decreased withincreasing maturity. The gas production and methane production at 24 h ranged from 25.83 to 35.50 ml and 3.97to 5.43 ml respectively. Metabolisable energy and organic matter digestibility ranged from 5.74 to 7.10 MJ kg-1DM and 37.80 to 46.24 % respectively. As a conclusion, the nutritive value of teff plant decreased with increasingmaturity. Therefore the teff plant can be harvested or grazed before flowering and after flowering stages due tocrude protein and metabolisable energy
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