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This article in CFTM

  1. Vol. 3 No. 1
     
    Received: Dec 01, 2016
    Accepted: Mar 18, 2017
    Published: June 1, 2017


    * Corresponding author(s): jlfoster@ag.tamu.edu
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doi:10.2134/cftm2016.12.0077

Forage Mass, Nutritive Value, and In situ Degradation of Sorghum Silage Treated with Fibrolytic Enzymes

  1. Kimberly McCuistiona,
  2. Jamie L. Foster *b,
  3. Greta Schusterc,
  4. David Westerd,
  5. Zachary Lopezc,
  6. Alinna M. Umphresc and
  7. Adrian Coronadoc
  1. a King Ranch Institute for Ranch Management, Texas A&M Univ., Kingsville, TX 78363
    b Texas A&M AgriLife Research, Beeville, TX, 78102
    c Dep. of Agriculture, Agribusiness, and Environmental Sciences, Texas A&M Univ., Kingsville, TX 78363
    d Dep. of Animal, Rangeland, and Wildlife Sciences, Texas A&M Univ., Kingsville, TX, 78363
Core Ideas:
  • Xylanase and cellulase treatment of sorghum silage did not affect sorghum silage nutritive value.
  • The brown midrib trait and harvest timing have more influence on silage quality than fibrolytic enzymes.

Abstract

Sorghum [Sorghum bicolor (L.) Moench.] and sorghum-sudangrass (S. bicolor × S. bicolor drummondii) silage utilization in cattle diets has increased in recent years. The objectives of this study were to compare the forage mass and nutritive value of photoperiod-sensitive (PS) sorghum and hybrid sister lines with or without the BMR trait, and determine if fibrolytic enzymes would improve the rate and extent of in situ disappearance of PS forage sorghum (FS) and PS sorghum-sudagrass (SS) silage varieties with or without the brown midrib (BMR) trait (i.e., FS-PS, FS-PS/BMR, SS-PS, and SS-PS/BMR). This experiment was a 2 × 2 × 2 factorial arrangement whereby the crop was grown, chopped, and ensiled and inoculated with or without (control) the enzyme mixture. Yield was at least 1.6 ton/acre and nutritive value similar to that of similar cultivars. Mini-silo buckets were sealed for 150 days, and dried silage material weighed into duplicate Dacron bags for in situ incubation for 0, 4, 8, 16, 24, 48, or 72 h in three ruminally cannulated Angus steers (679 ± 52.9 lb body weight [BW]) to determine rate and extent of dry-matter (DM) disappearance. The addition of fibrolytic enzymes had little effect on the nutritive value of ensiled forage. Non-BMR silage had a greater potentially degradable fraction; however, BMR varieties had a greater wash loss and extent of digestion. Based on our results, selecting a sorghum variety with the BMR trait may be more important than using a fibrolytic enzyme to improve silage degradation characteristics.

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