Effect of Pre-grazing Sward Length and Daily Herbage Allowance on Nitrogen Utilization in the Rumen and Supply to the Duodenum of Steers Under Rotational Grazing

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  • AIBIBULA Yimamu
    Department of Agro-Environmental Science, Obihiro University of Agriculture and Veterinary Medicine
  • HANADA Masaaki
    Department of Agro-Environmental Science, Obihiro University of Agriculture and Veterinary Medicine
  • OKAMOTO Meiji
    Department of Agro-Environmental Science, Obihiro University of Agriculture and Veterinary Medicine

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  • 放牧飼養された去勢牛の反芻胃内における窒素利用および下部消化管への窒素供給に及ぼす草丈と割当草量の影響

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Abstract

Four Holstein steers fitted with cannulae in the rumen and duodenum were grazed on orchardgrass (Dactylis glomerata L.) pasture to examine the effect of pre-grazing sward length and daily herbage allowance on ruminal nitrogen (N) digestibility and duodenal non-ammonia nitrogen (NAN) supply. Pasture maintained at two levels of daily herbage allowance of 50 and 100gDM/per kg BW of steers and two levels of sward length (35 and 25 cm) were allocated to four treatments in a 2×2 factorial design. N content of herbage did not significantly differ between sward lengths but declined when the daily herbage allowance was high (P<0.01). N intake increased in the short sward pasture than in the long sward pasture (P<0.05). However, the duodenal NAN flow was greater in the long sward pasture than in the short sward pasture (P<0.01), because the microbial N synthesis in the rumen and the ruminally undegraded N flow to the duodenum significantly increased in steers grazing on the long sward pasture (P<0.01). The amount of post-rumen N disappearance increased when steers grazed the long sward pasture compared with the short sward pasture (P<0.01).

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