Potential nutritive value and condensed tannin contents of acorns from different oak species

Quercus suber, Quercus branti, Quercus coccifera, Quercus cerris ve Quercus infectoria meşe palamutlarının potansiyel besleme değerleri, kimyasal kompozisyon ve in vitro gaz üretim tekniği kullanılarak tahmin edilmiştir. Meşe palamutları üç farklı deneme ünitesinden en az 10 ağaçtan toplanmıştır. Farklı meşe türünden elde edilen palamutlar arasında önemli farklılar olup, ham protein içeriği bir kg’da 25.58 ile 61.94 g arasında, NDF içeriği 231.4 ile 326.3 g arasında, ADF içeriği 155.9 ile 215.4 g arasında, kondense tanen içeriği 7.2 ile 26.7 g arasında, nişasta içeriği 600.0 ile 681.5 g arasında değişmiştir. Polyethylene glycol (PEG) eklenmesi meşe palamutlarından üretilen gaz ve tahmin edilen parametreleri önemli derecede artırmıştır. PEG eklenmeden elde edilen potansiyel gaz üretimi bakımından meşe palamutları arasında önemli farklar olmamasına rağmen, PEG eklenmesiyle birlikte potansiyel gaz üretimleri bakımından meşe palamutları arasında önemli farklar bulunmuştur. PEG eklenmeden yapılan hesaplamada, Q. suber ve Q. infectoria palamudunun organik madde sindirim derecesi (OMSD) ve metabolik enerji (ME) değerleri Q. branti, Q. coccifera ve Q. cerris palamutlarının OMSD ve ME değerlerinden önemli derecede yüksek bulunmasına rağmen, PEG ekleyerek yapılan hesaplamada, Q. cerris ve Q. infectoria palamudunun OMSD ve ME değerleri, Q. suber, Q. branti ve Q. coccifera palamutlarından daha düşük bulunmuştur. PEG katılmasıyla gaz üretimi, OMSD ve ME değerlerindeki meydana gelen iyileşmeler kondense tanenin sindirim üzerindeki negatif etkisini göstermektedir. Sonuç olarak yüksek nişasta, OMSD ve ME fakat düşük miktarda kondense tanen içermesinden dolayı meşe palamutları koyun keçi gibi ruminant hayvanlar için besleme potansiyeline sahiptir. Bunula birlikte bu çalışmada elde edilen sonuçlar yedirme denemeleriyle desteklenmelidir.

Anahtar Kelimeler:

Quercus cerris, Quercus, Quercus coccifera, Quercus suber, meşe palamudu, kimyasal bileşim, ham protein, sindirilebilirlik, lif içeriği, gaz üretimi, metabolize olabilir enerji, besin değeri, bitki bileşimi, polietilen glikol, protein içeriği, tür farklılıkları, nişasta, tanen

Farklı meşe türlerinden elde edilen palamutlarının potansiyel besleme değeri ve kondense tanen içerikleri

The potential nutritive values of acorns of Quercus suber, Quercus branti, Quercus coccifera, Quercus cerris and Quercus infectoria were estimated by chemical composition and in vitro gas production technique. Acorns collected at least 10 different trees in three experimental plots. There were significant (P<0.001) differences in the chemical composition among acorns obtained from different oak species. Crude protein (CP) contents of acorns ranged from 25.48 to 61.94 g/kg dry matter (DM). Neutral detergent fiber (NDF) contents ranged from 231.4 to 326.3 g/kg DM. Acid detergent fiber (ADF) contents ranged from 155.9 to 215.4 g/kg DM. Condensed tannin (CT) contents ranged from 7.2 to 26.7 g/kg DM. Starch contents ranged from 600.0 to 681.5 g/kg DM. Polyethylene glycol (PEG) addition significantly (P<0.001) increased the gas production and some estimated parameters of oak acorns. Although there is no significant (P>0.5) differences in the potential gas production of acorn among oak species when incubated in the absence of PEG, there is significant (P<0.001) differences in the potential gas production of acorn among oak species when incubated in the presence of PEG. Although the estimated organic matter (OMD) and metabolisable (ME) contents of acorn for Q. suber and Q. infectoria were significantly (P<0.001) higher than those for Q. branti, Q. coccifera and Q. cerris when incubated in the absence of PEG, the estimated OMD and ME contents of acorn for Quercus cerris and Q. infectoria were significantly lower than those for Q. suber, Q. branti and Q. coccifera when incubated in the presence of PEG. The improvement in gas production, OMD and ME in the presence of PEG emphasizes the negative effect of tannins on digestibility. As a conclusion, oak acorns have potential nutritive values for ruminant animals such as sheep and goat since acorns have high starch, OMD and ME but low level of CT contents. However these results obtained in the current study should be supported by in vivo feeding experiments.

Keywords:

Quercus cerris, Quercus, Quercus coccifera, Quercus suber, acorns, chemical composition, crude protein, digestibility, fibre content, gas production, metabolizable energy, nutritive value, plant composition, polyethylene glycol, protein content, species differences, starch, tannins,

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