The effect of pelleting on in situ rumen degradability of compound feed containing brown rice for dairy cows
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- 作者：Shin-ichi Tagawa ; Norio Yoshida ; Yukihiro Iino ; Ken-ichi Horiguchi ; Toshiyoshi Takahashi ; Maria Watanabe ; Kei Takemura ; Syuhei Ito and Toyoji Mikami
- 刊名：Animal Science Journal
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：88
- 期：1
- 页码：185-189
- 全文大小：192K
- ISSN：1740-0929
文摘
This study was conducted to determine the effect of pelleting on in situ dry matter degradability of pelleted compound feed containing brown rice for dairy cows. Mash feed of the same composition was used as a control and the in situ study was conducted using three non-lactating Holstein steers fitted with a rumen cannula. The feeds contained 32.3% brown rice, 19.4% rapeseed meal, 11.4% wheat bran and 10.6% soybean meal (fresh weight basis). Except for moisture content, the chemical composition of the feed was not affected by pelleting. In situ dry matter disappearance of the feed increased from 0 to 2 h and after 72 h of incubation with pellet processing. Integration of the dry matter disappearance values over time revealed that degradability parameter a (soluble fraction) increased with pellet processing, whereas parameter b (potentially degradable fraction) decreased. Parameter c (fractional rate of degradation) and effective degradability (5% passage rate) were not affected by pellet processing. We concluded that pellet processing promotes rumen degradability at early incubation hours when the pelleted feed contains brown rice.