CHARACTERIZATION OF CASSAVA (MANIHOT SCULENTA CRANTZ) AERIAL PARTS FOR RUMINANT FEEDING

The objective of this research was to characterize the chemical composition and digestibility of aerial part and cuttings of four cassava cultivars grown in five different levels of soil fertilization and three plant densities, in order to use the residues for ruminant feeding. The experiment was conducted using a randomized complete block design, in strip-split-plot scheme, with four replicates. The plots were composed of IAC14, IAC15, IAC90, and Cascuda cultivars; the subplots consisted of five fertilization categories, one fertilization with poultry litter (3000 kg.ha-1) and four chemical fertilization rates (0, 150, 450, 900 kg.ha-1) with NPK 4-20-20; and with the sub-subplots consisted of three plant densities (7,500, 12,500, 17,500 plants.ha-1). During the experiment, aerial part and cuttings were sampled for chemical and in vitro digestibility analyzes. There were differences between the varieties of cassava and fertilization rates on fiber fractions, chemical composition, in vitro digestibility, total digestible nutrients (TDN), and dry matter yield (kg / ha) of aerial part (P

Characterization of cassava (Manihot sculenta crantz) aerial parts for ruminant feeding / Caracterização da parte aérea de mandioca para alimentação animal

The objective of this research was to characterize the chemical composition and digestibility of aerial part and cuttings of four cassava cultivars grown in five different levels of soil fertilization and three plant densities, in order to use the residues for ruminant feeding. The experiment was conducted using a randomized complete block design, in strip-splitplot scheme, with four replicates. The plots were composed of IAC14, IAC15, IAC90, and Cascuda cultivars; the subplots consisted of five fertilization categories, one fertilization with poultry litter (3000 kg.ha-1 ) and four chemical fertilization rates (0, 150, 450, 900 kg.ha-1 ) with NPK 4-20-20; and with the sub-subplots consisted of three plant densities (7,500, 12,500, 17,500 plants.ha-1 ). During the experiment, aerial part and cuttings were sampled for chemical and in vitro digestibility analyzes. There were differences between the varieties of cassava and fertilization rates on fiber fractions, chemical composition, in vitro digestibility, total digestible nutrients (TDN), and dry matter yield (kg / ha) of aerial part (P < 0.05) and cuttings (P < 0.05). Cassava aerial part and cuttings have considerable amounts of nutrients that can be used for ruminant feeding on small farms and for animal categories with low nutritional requirements. From all treatments, variety IAC15, with chemical fertilization of 900 kg.ha-1, as well as fertilization with poultry litter, with the highest plant density, were those with better nutritional composition and greater amount of available nutrients. (AU)

O objetivo desta pesquisa foi quantificar e estudar a composição química e a digestibilidade da parte aérea e da manivamãe de quatro cultivares de mandioca, cultivadas sob cinco diferentes níveis de adubações e três densidades de plantio, com a finalidade de utilização destes coprodutos na alimentação de ruminantes. O experimento foi realizado no Pólo Regional de Desenvolvimento do Médio Paranapanema utilizando o delineamento experimental em blocos casualizados, em esquema de parcelas sub-subdivididas, com quatro repetições. As parcelas foram compostas pelas cultivares IAC 14, IAC 15, IAC 90 e Cascuda; as subparcelas compostas por doses de 4-20-20 (0, 150, 450, 900 kg/ha) ou adubação com cama de frango (3.000 kg/ha de cama de frango) e as sub-subparcelas compostas por densidades de plantio de 7.500, 12.500, 17.500 plantas/ha. Foram feitas amostragens de parte aérea e maniva-mãe e realizadas análises químicas para determinação dos nutrientes e digestibilidade in vitro. Houve diferença entre as variedades de mandioca e níveis de fertilização sobre as frações da fibra; composição química; digestibilidade in vitro; nutrientes digestíveis totais (NDT), e rendimento de matéria seca (kg/ha) da parte aérea (P < 0,05) e da maniva-mãe (P < 0,05). A parte aérea e a maniva-mãe oriundas das sobras da colheita de variedades de mandiocas selecionadas para a produção de raiz possuem cons

Characterization of cassava (Manihot sculenta crantz) aerial parts for ruminant feeding / Caracterização da parte aérea de mandioca para alimentação animal

The objective of this research was to characterize the chemical composition and digestibility of aerial part and cuttings of four cassava cultivars grown in five different levels of soil fertilization and three plant densities, in order to use the residues for ruminant feeding. The experiment was conducted using a randomized complete block design, in strip-splitplot scheme, with four replicates. The plots were composed of IAC14, IAC15, IAC90, and Cascuda cultivars; the subplots consisted of five fertilization categories, one fertilization with poultry litter (3000 kg.ha-1 ) and four chemical fertilization rates (0, 150, 450, 900 kg.ha-1 ) with NPK 4-20-20; and with the sub-subplots consisted of three plant densities (7,500, 12,500, 17,500 plants.ha-1 ). During the experiment, aerial part and cuttings were sampled for chemical and in vitro digestibility analyzes. There were differences between the varieties of cassava and fertilization rates on fiber fractions, chemical composition, in vitro digestibility, total digestible nutrients (TDN), and dry matter yield (kg / ha) of aerial part (P < 0.05) and cuttings (P < 0.05). Cassava aerial part and cuttings have considerable amounts of nutrients that can be used for ruminant feeding on small farms and for animal categories with low nutritional requirements. From all treatments, variety IAC15, with chemical fertilization of 900 kg.ha-1, as well as fertilization with poultry litter, with the highest plant density, were those with better nutritional composition and greater amount of available nutrients.

O objetivo desta pesquisa foi quantificar e estudar a composição química e a digestibilidade da parte aérea e da manivamãe de quatro cultivares de mandioca, cultivadas sob cinco diferentes níveis de adubações e três densidades de plantio, com a finalidade de utilização destes coprodutos na alimentação de ruminantes. O experimento foi realizado no Pólo Regional de Desenvolvimento do Médio Paranapanema utilizando o delineamento experimental em blocos casualizados, em esquema de parcelas sub-subdivididas, com quatro repetições. As parcelas foram compostas pelas cultivares IAC 14, IAC 15, IAC 90 e Cascuda; as subparcelas compostas por doses de 4-20-20 (0, 150, 450, 900 kg/ha) ou adubação com cama de frango (3.000 kg/ha de cama de frango) e as sub-subparcelas compostas por densidades de plantio de 7.500, 12.500, 17.500 plantas/ha. Foram feitas amostragens de parte aérea e maniva-mãe e realizadas análises químicas para determinação dos nutrientes e digestibilidade in vitro. Houve diferença entre as variedades de mandioca e níveis de fertilização sobre as frações da fibra; composição química; digestibilidade in vitro; nutrientes digestíveis totais (NDT), e rendimento de matéria seca (kg/ha) da parte aérea (P < 0,05) e da maniva-mãe (P < 0,05). A parte aérea e a maniva-mãe oriundas das sobras da colheita de variedades de mandiocas selecionadas para a produção de raiz possuem cons