Effect of diets differing in protein concentration (low vs medium) and nitrogen source (urea vs soybean meal) on in vitro rumen fermentation and on performance of finishing Italian Simmental bulls
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- 作者：Mauro Spanghero ; mauro.spanghero@uniud.it ; Federico Mason federico.mason@uniud.it ; Cristina Zanfi cristina.zanfi@uniud.it ; Anna Nikulina nikulina.anna@spes.uniud.it
- 关键词：Dietary protein ; Dietary urea ; Rumen continuous fermenter ; Simmental bulls ; Carcass traits ; Meat quality
- 刊名：Livestock Science
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：196
- 期：Complete
- 页码：14-21
- 全文大小：299 K
- 卷排序：196
文摘
Dietary protein levels and urea inclusion were tested in finishing Simmental bulls. Low protein diets (70–74 g/kg DM of PDI) tended to decrease weight gain. Low protein diets did not affect carcass traits and meat quality. Substituting SBM with urea (0.5% DM) did not depress growth and carcass traits. Diets high in protein or with urea stimulated rumen butyrate yield in vitro.