Önder CANBOLAT, Yavuz GÜRBÜZ, Osman ÖZAY, Adem KAMALAK

Prediction of dry matter intake and dry matter digestibilities of some forages using the gas production

Serbest yemlemeye tabi tutulan erkek toklularda buğday samanı, arpa samanı, yonca samanı, yonca silajı ve mısır silajına ait yem tüketimi ve sindirim derecesi tespit edilmiştir. Aynı yemlere ait örnekler, zamana bağlı gaz üretim değerlerini tespit etmek için, rumen sıvısıyla inkübasyona tabi tutulmuştur. Gaz ölçümleri 3, 6, 12, 24, 48, 72 ve 96 saatler için yapılmıştır. Gaz üretimine ait a, b ve c değerleri y = a+ b $(1-e-^{ct})$ fonksiyonu kullanılarak tespit edilmiştir. Bütün inkübasyon sürelerinde elde edilen gaz üretim değerleri (mi) ile yem tüketimi ve sindirim dereceleri arasında önemli (P < 0.001) korelasyon bulunmuştur.Sabit c değeri, kuru madde sindirim derecesindeki varyasyonun % 74'lük kısmını açıklamasına rağmen, sabit b değeri % 92'lik kısmını açıklamıştır. Sabit c ve (a+b)'nin birlikte kullanılması durumunda sindirim derecesinde görülen varyasyonun % 96'lık kısmı açıklanmıştır. Sabit c değeri, yem tüketimindeki varyasyonun % 78'lik kısmını açıklarken, sabit b değeri ise ancak % 70'lik kısmını açıklamıştır. Gaz üretimine ait parametrelerin birlikte kullanılması durumunda, yem tüketimindeki varyasyonun % 84-90'lık kısmı açıklanmıştır. Sonuç olarak, kuru madde sindirim derecesi ve yem tüketimini tahmin etmedeki isabet derecesi, gaz üretimine ait parametrelerin birlikte kullanılmasıyla artmaktadır. Gaz üretim tekniği, yem tüketimi ve yemin sindirim derecesini tahmin etmede iyi bir potansiyele sahiptir.

Koyunlarda, Bazı kaba yemlere ait kuru madde tüketim düzeyi ve kuru madde sindirilebilirliklerin gaz üretim tekniği ile tahmini

Wheat straw, barley straw, alfalfa hay, alfalfa silage and maize silage were offered ad libitum to three male sheep, and daily dry matter intake (DMI) and apparent dry matter digestibility (DMD) were measured. Samples of forages were incubated with rumen fluid to determine gas production. Gas productions were measured at 3, 6, 12, 24, 48, 72 and 96, and gas production constants (a, b, c,) were described using the equation y = a + b $(1-e-^{ct})$. Gas production at all incubation times and gas production constants (c, b and a+b) were significantly (P < 0.001) correlated to DMD or DMI. Although the gas production constant c explained 74% of the variation of DMD, the gas production constant b explained 92% of the variation of DMD. The gas production constants c and (a+b) in combination explained 96% of the variation of DMD. The gas production constants b and c alone explained 70% and 78% of the variation of DMI respectively. The gas production constants in combination explained 84-90% of the variation of DMI. It was concluded that the accuracy of predicting DMD or DMI can be increased when gas production constants are used in combination, and the in vitro gas production technique has good potentiality to predict DMD and DMI.

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