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거세우에 있어서 사료단백질의 종류가 미생물체 단백질합성 , 단백질의 분해도 및 사료의 소화율에 미치는 영향
하종규,육종륭 ( J . K . Ha,C . Y . Yuk,J . J . Kennelly,R . Berzins ) 한국축산학회 1985 한국축산학회지 Vol.27 No.12
Effects of dietary nitrogen source on microbial protein synthesis, dietary protein degradation and nutrient digestion were examined with cannulated mature Holstein steers. Animals were fed 40% hay and 60% concentrate mixtures containing urea, soybean meal (SBM), canola meal (CM) and dehydrated alfalfa (Dehy) as a supplementary protein source. Nitrogen source in the diets did not alter duodenal or ileal flow rates of dry matter (DM) or organic matter (OM). Partial digestibility of DM and OM prior to the duodenum and in the small intestine, and total digestibility in the whole digestive tract were similar across all dietary treatments. Steers fed SBM and Dehy had higher (P$lt;0.05) concentration of total nitrogen and non-ammonia nitxogen in duodenal digesta than those fed urea and CM. Dehy-fed steers had lower (P$lt;0.05) concentration of microbial nitrogen than other groups. A tendency for higher flow of total nitrogen and lower flow of microbial nitrogen and therefore, lower ratio of microbial to non-ammonia nitrogen was observed with decreasing protein degradabilities of the diets containing the natural protein sources. The degradabilities of dietary protein, in vivo, were 66.3, 57.9, 63.3 and 41.0% for urea, SBM, CM and Dehy supplemented diets, respectively.