Yonca otu ve dane mısır partikül büyüklüklerinin süt ineklerinde süt verimi ve bileşenleri, çiğneme aktivitesi ve rumen pH’sı üzerine etkileri

Bu çalışmada yonca otu ve dane mısır partikül büyüklüklerinin süt ineklerinde yem tüketimi, süt verimi, süt kompozisyonu, çiğneme aktivitesi ve rumen pH’sı üzerine olan etkileri araştırılmıştır. Yonca otu 4 cm (uzun; U) veya 1 cm (kısa; K) teorik kesim uzunluğunda doğranmıştır. Dane mısırın partikül büyüklüğü ise 1 mm (iri; İ) veya 1mm’ den daha küçük (ufak; U) partikül büyüklüğünde öğütülmeyle sağlanmıştır. Dört tane 2 veya üstü laktasyondaki Holstein inek 4×4 Latin Kare deseninde ve 2×2 faktör düzenlemesindeki muamelelere 21 günlük dönemde tahsis edilmiştir. Muameleler arasında kuru madde (KM) ve NDF tüketimleri yönünden bir fark gözlenmemiş ve ortalama 23,6 ve 10,6 kg/gün bulunmuştur. Muameleler arasında süt ve süt protein verimi yönünden de bir fark bulunmamış, sırasıyla ortalama 22,8 ve 0,75 kg/gün bulunmuştur. Ancak süt yağı verimi İ dane mısırda (0,82 kg/gün) U’ya (0,73 kg/gün) göre daha yüksek olma eğiliminde bulunmuştur. Yonca otu ve dane mısır partikül büyüklükleri arasındaki etkileşim yönünden, süt protein yüzdesi Kİ rasyonunda (% 3,31) KU rasyonuna (% 3,23) göre daha yüksek olma eğiliminde bulunmuştur. Çiğneme aktivitesi yönünden muameleler arasında bir fark gözlemlenmemiştir. Yemlemeden 9 saat sonrasındaki rumen pH’sı, KU (6,50) ve Kİ (6,36)’de UU (6,06) ve Uİ (6,17)’ye göre daha yüksek şekillenmiştir. Bu araştırmadaki veriler, yonca otu partikül büyüklüğünün süt verimi ve süt kompozisyonu üzerine bir etkisinin olmadığını gösterirken, İ dane mısır içeren rasyonlarda süt yağı verimi yüksek şekillenmiştir.

Interaction between particle sizes of alfalfa hay and corn grain on milk yield, milk composition, chewing activity, and ruminal pH of dairy cows

The objective of this study was to determine the interactions between alfalfa hay and corn grain particle sizes on nutrient intake, milk yield, milk composition, chewing activity, and ruminal pH of dairy cows. Alfalfa hay was chopped either at 4 cm (long; L) or 1 cm (short; S) theoretical length of cut. Particle size of corn grain was obtained by grinding either at 1 mm (coarse; C) or less than 1 mm (fine; F) mean particle size. Four lactating multiparous Holstein cows were assigned in a 4×4 Latin Square design in a 2×2 factorial arrangement of treatments with 21-day periods. Intakes of DM (DMI) and NDF (NDFI) were not different among treatments averaging 23.6 and 10.6 kg/d. Similarly, yields of milk and milk protein were not different among treatments averaging 22.8 and 0.75 kg/d, respectively. However milk fat yield tended to be higher for C (0.82 kg/d) than F (0.73 kg/d) corn grain. An interaction trend was observed between particle sizes of alfalfa hay and corn grain for milk protein percentage where it tended to be higher for SC (3.31%) compared to SF (3.23%). Chewing activity was not affected by any treatment. Ruminal pH was higher at 9 h of post-feeding for both SF (6.50) and SC (6.36) compared to LF (6.06) and LC (6.17). The data indicate that particle size of alfalfa hay had no effect on milk yield and any milk composition but diets containing C corn grain resulted in a higher milk fat yield.

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Turkish Journal of Veterinary and Animal Sciences-Cover
  • ISSN: 1300-0128
  • Yayın Aralığı: Yılda 6 Sayı
  • Yayıncı: TÜBİTAK
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