Rivera-Estremera, Loures

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    Determinación de digestibilidad y consumo de materia seca de Heno de Arachis glabrata en rumiantes
    (2003) Rivera-Estremera, Loures; Ruiz-López, Teodoro M.; College of Agricultural Sciences; Randel, Paul F.; Macchiavelli, Raúl; Latorre, José R.; Department of Animal Science; Borges, Sonia
    The experiment was conducted to determine the digestibility of hays from two accessions of rhizoma peanut (RP;17033 and 17097) and from Bermuda grass (B) as determined by the total collection method (in vivo), with nine mixed-breed lambs randomly allotted to treatments in a 3 x 3 latin square design with three repetitions. Also, the three methods for determining forage digestibility (in vivo, in vitro and in situ) were compared. Estimates of in vitro digestibility were obtained using a Daisy II incubator (48 hours). In addition, in situ digestibility using dacron bags placed (48 hours) inside the rumen of a fistulated cow fed grass hay was determined. Daily intake of dry matter (DM), organic matter (OM) and acid detergent fiber (ADF) were similar for both RP accessions and were higher (P<0.05) than B, 1.02 vs. .7442 kg/d, .9185 vs. .6782 kg/d and .3764 vs. .2774 kg/d, respectively. In vivo DM, OM, crude protein (CP), and ADF digestibility and digestible energy (DE) of both RP accessions were higher (P<0.05) than those of B. Small, but significant differences were found between the two RP accessions in favor of 17097 in digestibility of DM, OM, and neutral detergent fiber (NDF) and in favor of 17033 in CP digestibility and DE. In vivo ADF digestibility did not differ (P>0.05) between the RP accessions. In vitro and in situ DM and NDF digestibility were higher (P<0.05) for the two RP combined as compared to B (in vitro, 66.83 vs. 44.74 % e in situ, 71.63 vs. 48.12 % of DM; in vitro, 42.21 vs. 30.01 %, e in situ, 42.25 vs. 25.14 % of NDF, respectively). However, both in vitro and in situ OM digestibility differed (P<0.05) among all three hays, being greatest for RP 17033 (65.21 %). Both in vitro and in situ methods overestimated in vivo DM and OM digestibility of both RP accessions and underestimated those of B. In vivo NDF digestibility of both RP was underestimated by both in vitro and in situ methods. According to the results, the in situ method gave the best estimates of in vivo digestibility. Because of its high voluntary intake and digestibility, as determined by three methods (in vivo, in situ and in vitro), the RP demonstrated its outstanding quality potential.