The aim of this study was to evaluate the chemical composition, in vitro DM degradability, ME and OMD of alfalfamaize silage mixtures in comparison to pure maize and alfalfa silages, and to test the existence of associative effects of ensiling alfalfa forage with whole-crop maize using the in vitro gas production technique. Ensiling alfalfa with whole-crop maize had a significant (p<0.001) effect on chemical composition, pH, in vitro DM degradability, OMD and estimated ME values of mixtures. DM content of the resultant silages significantly increased with increasing proportion of whole-crop maize in the mixtures, whereas the pH value, crude protein (CP), acid detergent fibre (ADF) and ash contents of mixtures decreased due to the dilution effect of whole-crop maize which was low in CP, ADF and ash. The pH values of all alfalfa-maize silage mixtures were at the desired level for quality silage. Gas production of alfalfa-maize silage mixtures at all incubation times except 12 h increased with increasing proportion of whole-crop maize. When alfalfa was mixed with whole-crop maize in the ratio 40:60, ME and OMD values were significantly (p<0.001) higher than other silages. Maximum gas production (A gas ) ranged from 65.7 to 78.1 with alfalfa silage showing the lowest maximum gas production. The results obtained in this study clearly showed that maximum gas production increased with increased percentage of whole-crop maize in the silage mixtures (r = 0.940, p<0.001). It was concluded that ensiling alfalfa with whole-crop maize improved the pH, OMD and ME values. However, trials with animals are required to see how these differences in silage mixtures affect animal performance.

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Bu araştırma, Kahramanmaraş'ta elde edilen bazı ağaç türlerinin besin değerleri ile yaprak ve ekstraktlarının farklı doz seviyelerinde (0.6, 1.2 ve 1.8 mL) gaz üretimini belirlemek amacıyla yapılmıştır. ADF ve NDF içerikleri sırasıyla %16.20 - %32.47 ve %28 - %49.66 arasında farklılık göstermiştir. Her iki özellik açısından (ADF, NDF) en yüksek değerler L. orientalis'te, en düşük değerler ise S.alba yapraklarında bulunmuştur. Diğer kimyasal özellik CP değeri ise %7.94 ile %25.94 arasında değişmiştir. CT içerikleri en yüksek %16.19 ile L. orientalis yapraklarında, en düşük değeri ise %2.12 ile A. julibrissin yapraklarında bulunmuştur. Besin değerleri, ME ve OMD sırasıyla 6.72 - 10.24 MJ kg-1 ve %43.68 - %65.72 arasında değişmektedir. Numunelerin GP içeriği 22.25 - 40.03 mL 200-1 mg (DM) arasında değişmiştir. Çalışmada kullanılan farklı doz, kontrol grubuna kıyasla hem GP hem de CH4 üretiminde önemli artışlar buldu. Kontrol grubu için yaprak özütlerinin GP'si 44.89 mL idi ve 0.6, 1.2 ve 1.8 mL'deki dozlar bulundu; Sırasıyla 51.05 - 105.96 mL, 52.71 - 106.26 mL ve 47.33 - 106.85 mL. Kontrol grubu için metan üretimi (%) konsantrasyonu %16.54 olup, %0.6, 1.2 ve 1,8 mL dozlarında sırasıyla %16.64 - %34.40, %22.44 - %34.80 ve %18.41 - %31.46 oranında gözlenmiştir. CH4 üretimi ile ADF ve NDF arasında anlamlı ilişkiler olduğu tespit edilmiştir.

The objective of this study was to determine the effect of harvest stage on the chemical composition, metabolisable energy and dry matter digestibility of A. andrachne leaves. Harvesting stage had a significant effect on the chemical composition, metabolisable energy and dry matter digestibility of leaves of A. andrachne. The IVDMD of the leaves of A. andrachne ranged from 28.56 to 67.73 %. The highest IVDMD was obtained in January and April whereas the lowest IVDMD was obtained in October. The ME contents of the leaves of A. andrachne ranged from 3.11 to 9.02 MJ/kg DM. The highest IVDMD was obtained in January whereas the lowest IVDMD content was obtained in October. As conclusion the chemical composition, IVDMD and ME content of the leaves ranged with harvesting time. Leaves of A. andrachne should be supplemented with protein, P, Cu and Mn minerals sources to meet the requirement of sheep and goat since the leaves of A. andrachne harvested in four periods were low in crude protein and minerals.