Resumo

GODOY PADILLA, David José et al. Characterization of the nutritional value of agro-industrial by-products for cattle feeding in the San Martin region, Peru. Cienc. Tecnol. Agropecuaria [online]. 2020, vol.21, n.2, e1374.  Epub 30-Mar-2020. ISSN 0122-8706.  https://doi.org/10.21930/rcta.vol21_num2_art:1374.

The nutritional characterization of ten available agroindustrial residues in the San Martin region, Peru, was carried out. Nineteen residue samples were collected from 11 agroindustrial companies dedicated to oil palm, rice, cacao, coffee, coconut, and peach palm production. A proximal analysis was done to establish dry matter (DM), crude protein (CP), ethereal extract (EE), crude fiber (CF), nitrogen-free extract (NFE), and ash. Besides, in vitro apparent dry matter digestibility (IVADMD), neutral detergent fiber (NDF), protein fractions, usable crude protein (uCP), total digestible nutrients (TDN) and net energy of lactation (NEL) were determined. Results showed significant differences between agroindustrial residues according their nutritional potential (p< 0.05), where rice in different sizes, i.e., < 1/4 grain size, > 1/4 grain size, and rice dust, were energetic inputs with high NEl (2.1 ± 0.02, 2.1 ± 0.02 and 1.7 ± 0.02 Mcal/kg dry matter, respectively) and IVADMD values (99.3 ± 0.25 %, 90.5 ± 0.42 % and 99.0 ± 0.68 %, respectively). Besides, the inputs with the highest protein contribution were coconut cake and cacao husk (21.9 % and 21.8 ± 1.34 % of CP, respectively). Palm fiber and rice husk were the fibrous residues with lower use potential due to their low IVADMD (27.8 ± 2.45 % and 27.7 ± 5.02 %, respectively) and high NDF (69.8 ± 4.17 % and 72.6 ± 6.45 %, respectively). Heart of palm husk showed moderated IVADMD (57.2 %) and high NDF (60.4 %) values. Agroindustrial residues of the San Martin region have a varied energy and protein use potential in cattle feeding.

Palavras-chave : by-products; cattle feeding; in vitro digestibility; nutritive value; protein.

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