In Situ Digestion of Forages and Grains in Alpacas fed Alfalfa and Grass Hay

Stevens, N.; Robinson, Todd; Nilsen, B.; Johnston, N. P.

doi:10.5455/jasa.20140919032305

Cited by 1 publication

(2 citation statements)

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“…Dry matter fraction a degradation of the mixed GH for this study was slightly higher (approximately 14% more) than that measured by Stevens et al. () for alpacas fed tall fescue. Fraction b , rate of digestion and PE for this study were similar to Stevens et al.…”

Section: Discussioncontrasting

confidence: 68%

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Degradation parameters of amaranth, barley and quinoa in alpacas fed grass hay

Nilsen

Johnston

Stevens

et al. 2015

Animal Physiology Nutrition

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This study was conducted to determine the compartment 1 (C1) characteristics of alpacas (fistulated male, 7 ± 1.5 years old, 61 ± 5 kg BW) fed grass hay (GH) supplemented with amaranth (AM), quinoa (Q) and barley (B) grains. Alpacas were provided water ad libitum while housed in metabolism crates. The GH and GH plus treatments were fed at 0700 every day. Treatment periods were for 14 days in which GH or GH plus one of the grain treatments were randomly allocated. On day 14, volatile fatty acids (VFA), pH and ammonia nitrogen (NH3 -N) were determined at 1, 3, 6, 10, 14, 18 and 24 h post-feeding. C1 degradation of each feed component was also determined with the alpacas being fed GH only and the samples incubated for 0, 2, 4, 8, 14, 24, 48 and 72 h. Dry matter (DM), neutral detergent fibre (NDF) and crude protein (CP) were determined and were divided into three categories: a = immediately soluble; b = the non-soluble but degradable; and u = non-degradable/unavailable, potential extent of degradation (PE), degradation rate (c) and effective degradation (ED). C1 passage rate was determined using acid detergent insoluble ash as a marker and was calculated to be 5.5%∙h-1. Total DM intake was highest (p < 0.05) for B and resulted in a higher (p< 0.05) CP intake. GH and AM were different in mean pH (6.81 and 6.66, respectively). B NH3 -N was greater (p < 0.05) than the other treatments. Total VFA was greatest (p < 0.05) for AM, with the greatest composition differences being a shift form acetate percentage to butyrate. DM, NDF and CP degradation was different across the treatments, where PE and ED were higher (p < 0.05) for the grain treatments. The pseudo-grains AM and Q had similar C1 degradation characteristics to B.

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Section: Discussioncontrasting

confidence: 68%

“…Fraction b , rate of digestion and PE for this study were similar to Stevens et al. (). In vitro degradation of quinoa was shown to range from 65 to 69%, more in line with the starch digestion of corn starch (Repo‐Carrasco‐Valencia and Serna, ).…”

Section: Discussionsupporting

confidence: 53%