Feed Intake, Digestion and Milk Production in Dairy Cows Fed Early-harvested First-cut or Second-cut Orchardgrass Silage

DOI

Bibliographic Information

Other Title
  • 早刈りオーチャードグラス（<i>Dactylis glomerata</i> L.）1番草あるいは2番草サイレージを給与した乳牛の採食量，消化率および乳生産性

Abstract

<p>We evaluated the effect of feeding early-harvested first- or second-cut orchardgrass silage on dry matter intake, lactation, digestion, and N utilization in dairy cows. Six multiparous Holstein cows were used in a replicated 3×3 Latin square design with three dietary treatments. The diets involved gradually replacing first-cut silage with second-cut silage, flaked corn, or soybean meal at two incremental levels of 50% and 100%. All experimental diets contained 73% total digestible nutrients and 16% crude protein. The dry matter intake and milk production were not affected by the dietary treatment. However, fiber digestibility decreased with increasing second-cut silage, and milk fat content slightly decreased when the first-cut silage was replaced by the second-cut. Milk protein production was not affected by dietary treatment. Proportional to N intake, urinary N excretion increased; retention of N decreased with increasing levels of second-cut silage. No dietary effects were observed on N secretion in milk and fecal N excretion. These results showed that feeding second-cut silage instead of first-cut reduces fiber digestibility and N utilization, but this diet has a minor impact on feed intake and milk production when diets were formulated to contain 73% total digestible nutrient and 16% crude protein.</p>

Journal

Keywords

Details 詳細情報について

  • CRID
    1390857226420291584
  • DOI
    10.14941/grass.68.8
  • ISSN
    21886555
    04475933
  • Text Lang
    ja
  • Data Source
    • JaLC
  • Abstract License Flag
    Disallowed

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