Hıdır GENÇOĞLU, Çağdaş KARA, Mukaddes Merve EFİL, Hakan BİRİCİK, İbrahim İsmet TÜRKMEN, Gülay DENİZ, Arda KOVANLIKAYA, Randy Duncan SHAVER, Recep Tolga KIVANÇ, Ramazan YILDIRIM

Effects of Exogenous Amylase in Transition Dairy Cows Fed Low- Starch Diets: 2. Total Tract Digestibility and Blood Urea Nitrogen

The objective of this trial was to determine the effect of exogenous amylase during the transition period on total tract digestibility, rumen pH and blood urea nitrogen in lactating dairy cows. The effect of exogenous dietary amylase supplementation on lactation diets with low starch concentration (19.5% of dry matter) and dry period diets with moderate starch concentration was evaluated (15.5% of dry matter). A total of 30 multiparus Holstein cows were randomly assigned to two groups with amylase (n=15) or control (n=15). Three cows from each group were randomly selected and ruminally cannulated for digestibility trials. The research was conducted starting at 21 d prepartum until 84 d postpartum. Digestibility of dry matter, organic matter, neutral detergent fiber, starch, and crude protein remained unaffected by treatment in postpartum. Average pre- and postpartum rumen pH concentrations were 6.25 and 6.15, respectively, and did not differ between treatments. Blood urea nitrogen (BUN) concentrations were lower in cows fed amylase supplemented diet compared to those fed diet without amylase in both pre- and postpartum periods (P

Düşük Nişastalı Rasyonlarla Beslenen Geçiş Dönemindeki İneklerde Amilaz Enziminin Etkisi: 2. Toplam Sindirilebilirlik ve Kan Üre Azotu

Bu araştırmanın amacı geçiş dönemindeki ineklerin rasyonlarına amilaz enzimi ilavesinin toplam sindirilebilirlik, rumen pH’sı ve kan üre azotu üzerine etkisini incelemektir. Rasyonların nişasta düzeyi kuru madde esasına göre kuru dönemdeki hayvanlar için %15.5, laktasyon dönemindekiler için ise %19.5 olarak tespit edildi. Araştırmada birden fazla doğum yapmış 30 baş siyah alaca ırkı inekler rastgele amilaz (15) ve kontrol (15) gruplarına dağıtıldı. Her bir grupta üçer inek rumen kanülü mevcuttu. Deneme doğumdan önceki 21 gün ile doğumdan sonraki 84. günler arasında yürütüldü. Doğum sonrası kuru madde, organik madde, nötral deterjan fiber, nişasta ve ham protein sindirilebilirlik düzeyleri bakımından gruplar arasında bir farklılık bulunmamıştır. Ortalama doğum öncesi ve sonrası rumen pH değerleri sırasıyla 6.25 ve 6.15 olarak tespit edilmiş ve gruplar arasında fark bulunamamıştır. Hem doğum öncesi hem de doğum sonrası amilaz ile beslenen ineklerde kan üre azotu değerleri kontrol grubuna göre daha düşük bulunmuştur (P

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