AI Article Synopsis

  • Four Holstein steers were tested with different dietary combinations of whole crop corn or rice silage and steam-flaked corn or rice grain to assess effects on nutrient digestion and amino acid levels.
  • The rice-based diets showed better ruminal digestibility of starch and nonfiber carbohydrates but lower digestible fiber compared to corn-based diets, with no significant impact on microbial nitrogen flow.
  • The study indicated that the type of silage and grain influences nitrogen retention and essential amino acid profiles in steers, revealing that corn diets may lead to higher nitrogen retention due to better organic matter digestion.

Article Abstract

Four Holstein steers were used to evaluate the combination effects of whole crop corn (Cs) or rice (Rs) silage with steam-flaked corn (Cg) or rice (Rg) grain (four dietary treatments) on ruminal carbohydrate digestion, duodenal nitrogen (N) flow and plasma essential amino acid (EAA) concentration. The ruminal digestibility of starch and nonfiber carbohydrate (NFC) for Rs and Rg diets compared with Cs and Cg diets was greater, but that of neutral detergent fiber (aNDFom) was less. Because the ruminal disappearance of NFC plus aNDFom was similar across four dietary treatments, microbial N flow was not affected by the diets. There was an interaction of methionine (Met) flow by silage and grain sources: greatest for CsRg and least for RsRg diet, and blood plasma concentration of Met after feeding was lower for Rg than Cg diets. Postprandial reduction degree of plasma EAA varied with the diets and individual EAA. The Cs diets compared with the Rs diets tended to be greater in N retention because of greater digestible organic matter (OM) intake. These results suggest that silage source combined with corn or rice grain affects N use in steers through the digestible OM intake, and the kinds of limiting AA may differ among the combination of silage and grain sources.

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http://dx.doi.org/10.1111/asj.12096DOI Listing

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