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Journal of Animal Science Abstract - Animal Nutrition

Effects of Juniperus species and stage of maturity on nutritional, in vitro digestibility, and plant secondary compound characteristics

 

This article in JAS

  1. Vol. 93 No. 8, p. 4034-4047
     
    Received: May 06, 2015
    Accepted: June 11, 2015
    Published: July 24, 2015


    1 Corresponding author(s): trwhitney@ag.tamu.edu
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doi:10.2527/jas.2015-9274
  1. W. C. Stewart*†,
  2. T. R. Whitney 1*,
  3. E. J. Scholljegerdes,
  4. H. D. Naumann,
  5. N. M Cherry§,
  6. J. P. Muir§,
  7. B. D. Lambert§,
  8. J. W. Walker*,
  9. R. P. Adams#,
  10. K. D. Welch,
  11. D. R. Gardner and
  12. R. E. Estell
  1. * Texas A&M AgriLife Research, 7887 U.S. Hwy 87 N, San Angelo 76901
     Animal and Range Sciences Department, New Mexico State University, Box 30003, Las Cruces 88003
     Division of Plant Sciences, University of Missouri, 116 Waters Hall, Columbia 65211
    § Texas A&M AgriLife Research, 1229 N. U.S. Hwy 281, Stephenville 76401
    # Biology Department, Baylor University, Box 97388, Waco, TX 76798
      USDA-ARS Poisonous Plant Research Laboratory, Logan, UT 84341
     USDA-ARS Jornada Experimental Range, Las Cruces,NM 88003

Abstract

Rising feed costs and recurring feed shortages necessitate the investigation into alternative and underutilized feed resources. Nutritional characteristics of Juniperus species are either unknown or limited to leaves and ground material from small stems. Therefore, the objective was to quantify nutritional characteristics, 48-h true IVDMD (tIVDMD), microbial gas production, and secondary compound characteristics of entire woody plant material of 4 Juniperus species—Juniperus pinchotii, Juniperus monosperma, Juniperus ashei, and Juniperus virginiana—at immature and mature stages of growth. Immature plants had greater CP concentrations and lower NDF concentrations (P < 0.001) than mature plants regardless of species. Mature plants also had greater (P < 0.001) concentrations of ADF compared with immature plants with the exception of J. virginiana. In general, immature J. pinchotii, J. monosperma, and J. ashei had greater (P < 0.02) tIVDMD and total 48-h and asymptotic gas production than mature plants. Immature J. monosperma and J. pinchotii plants were more digested (tIVDMD; P < 0.001) than immature J. virginiana and J. ashei, but tIVDMD did not differ in mature plant material across species. Condensed tannins (CT) were greater (P < 0.001) in immature J. pinchotii and J. ashei than mature plants; differences in CT concentrations among immature species were also detected (P < 0.04). Volatile oil yields were similar across maturity and species with 1 exception: immature J. pinchotii yielded more (P < 0.02) volatile oil than mature material. Volatile oil composition across species varied and contained a range of 65 to 70 terpene compounds. The dominant terpenes across species were generally greater (P < 0.05) in immature vs. mature plant material with the exception of J. virginiana. Labdane acids were negligible in J. pinchotii, J. ashei, and J. virginiana and greater in J. monosperma (P < 0.001). Ground material from mature juniper species, although inferior in nutritional quality compared with immature plants, is comparable to traditional low-quality roughage ingredients. Given that J. pinchotii has been successfully fed in lamb feedlot diets, the similarities of J. pinchotii, J. ashei and J. monosperma suggest that all three species have potential to be effective roughage ingredients.

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