Abstract

CORRALES, MP et al. Acrocomia aculeata′s KERNEL EXPELLER EVALUATION BY IN VIVO AND IN VITRO DIGESTIBILITY TESTS IN SHEEP. Compend. cienc. vet [online]. 2015, vol.5, n.1, pp.7-13. ISSN 2226-1761.  https://doi.org/10.18004/compend.cienc.vet.2015.05.01.7-13.

ABSTRACT. The experiment involved Acrocomia aculeata kernel expeller′s (EAA) in vivo and in vitro digestibility tests in sheep. For in vivo digestibility test, 8 sheep were confined in metabolic cages according to a 4x4 Latin square design. The dry matter apparent digestibility (DMD), organic matter (OMD), crude protein (DPB), neutral detergent fiber (DFND) and ether extract (DEE) from basic food Digitaria decumbens hay (pangola grass) were first determined and then for each different increasing proportions of EAA kernel (Treatments (T), T1: 20%; T2: 40%; T3: 60%; T4: 80%). For in vitro digestibility, one sheep with cannulated rumen was used as a provider of ruminal fluid, applying the same treatments as in vivo test. This results were subjected to variance analysis, resulting statistically significant treatment effect for each of the variables studied in the in vivo (p < 0.05) and the evolution was linear for DMD, DMO and DFND, but quadratic for the DPB and DEE. The variance analysis applied to the treatment effect on in vitro dry matter digestibility (DIVDM) and organic matter (DIVOM) were significant (p < 0.05). The regression equations of in vivo and in vitro EAA digestibility determined by extrapolation the value of 100% inclusion EAA, the results of apparent digestibility were: 65.1; 69.6; and 73.43% for DMD, DMO and DFND respectively; 64.6 and 65.2% for DIVDM and DIVOM respectively. Furthermore the regression between the DDM and 2 DOM in vivo with DIVDM and DIVOM were established R > 0.9; suggesting, that in the future, is possible the application of the in vitro equations to estimate the in vivo, without losing sight of the corrections for the in vitro underestimates.

Keywords : kernel; Acrocomia aculeata; digestibility; sheep.

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