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Flemingia Macrophylla in Goat Feeding Revista Revista Brasileira de Zootecnia © 2015 Sociedade Brasileira de Zootecnia ISSN 1806-9290 R. Bras. Zootec., 44(9):335-341, 2015 www.sbz.org.br Flemingia macrophylla in goat feeding Isabel das Neves Oiticica1, Carlos Elysio Moreira da Fonseca2, Vinícius Carneiro de Souza3, Aline Barros da Silva1, Fernando César Ferraz Lopes4, Mirton José Frota Morenz4 1 Universidade Federal Rural do Rio de Janeiro, Programa de Pós-graduação em Zootecnia, Seropédica, RJ, Brasil. 2 Universidade Federal Rural do Rio de Janeiro, Departamento de Produção Animal, Seropédica, RJ, Brasil. 3 Universidade Estadual Paulista, Programa de Pós-graduação em Zootecnia, Jaboticabal, SP, Brasil. 4 Embrapa Gado de Leite, Juiz de Fora, MG, Brasil. ABSTRACT - The objective of this work was to evaluate the inclusion of Fabaceae Flemingia macrophylla (Willd.) Kuntze ex Merr. in the diet of lactating dairy goats arranged in a 5 × 5 Latin square. The diets were composed of 40% of concentrate and 60% of roughage, and the dietary treatments were defined by the level of Flemingia hay inclusion (0%, 8%, 16%, 24%, and 32% in the diet dry matter) replacing Cynodon dactylon cv. Tifton 85 hay. The diets were isonitrogenous, with 14% crude protein. Feed intake, nutrient digestibility, feeding behavior, and ruminal pH and ammonia nitrogen were evaluated. There was no difference in dry matter intake with the inclusion of Flemingia hay in the diet. The digestibility of dry matter, organic matter, crude protein, neutral detergent fiber, and total carbohydrates decreased with the inclusion of Flemingia in the diet. The diet did not change rumen ammonia nitrogen concentration or ruminal pH. There were no differences in the feeding behavior or feed and rumination efficiencies. Flemingia macrophylla can be used up to the level of 32% in the dry matter in diets for lactating goats. Key Words: digestibility, feeding behavior, leguminosae, ruminal pH, tropical forage Introduction two factors: one is the astringency, which reduces the acceptability of fodder by animals (Reed, 1995), reducing The seasonality of forage production leads to the feed intake or the number of visits to the trough (McLeod, use of alternative foods as an option in animal feeding, 1974; Jansman, 1993; Reed, 1995). The other factor is the especially in the dry season, when the pastures, mostly effect of tannin on the nutrient digestibility by forming formed by grasses, are scarce and have low nutritional complexes with proteins and carbohydrates, reducing the value. Thus, forage legumes have advantages in terms of ruminal degradation of these nutrients, or complexation nutrition, because they have a high protein content, good with microbial enzymes, decreasing its activity and digestibility, and low decline in nutritional value with consequently the digestibility of the feed (Makkar et al., advancing phenological stages. Legumes are an important 1988). Additionally, tannins can reduce enteric methane reserve of green food for the dry season and transfer production, so they are important for mitigating greenhouse atmospheric nitrogen into the soil through biological fixation gas emission by ruminants (Makkar, 2003). (Ben Salem et al., 2005). Lignin, another plant compound, contributes to the Flemingia macrophylla (Willd.) Kuntze ex Merr. is a structural integrity, resistance to degradation, and water legume that is adapted to acid soils of low fertility, sandy or impermeability of plants (Hatfield et al., 1999). According clayey, and is drought-tolerant (Salmi et al., 2013). Legumes, to Van Soest (1994), lignin is present in greater amounts such as Flemingia, produce secondary metabolites such as in legumes than in grasses and its main effect on animal tannins, which can be hydrolyzed or condensed. nutrition is the reduction of digestibility. Condensed tannins are the most common secondary This study was conducted to evaluate the feeding compound in legumes (Min et al., 2003). They may behavior, feed intake, ruminal pH and ammonia nitrogen, negatively influence feed intake by the animals by and digestibility of the nutrients in lactating goats fed increasing levels of Flemingia macrophylla (Willd.) Received January 6, 2015 and accepted June 25, 2015. Kuntze ex Merr. Corresponding author: [email protected] http://dx.doi.org/10.1590/S1806-92902015000900005 Material and Methods Copyright © 2015 Sociedade Brasileira de Zootecnia. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, This work was conducted in accordance with the distribution, and reproduction in any medium, provided the original work is properly cited. ethical standards of the institution. 336 Oiticica et al. The experiment was carried out in 2011 from August and sodium sulfite (Na2SO3). In addition, the residue to December in Seropédica - RJ, Brazil. The Flemingia from the NDF analyses was filtered in Goochs crucibles macrophylla (Willd.) Kuntze ex Merr. plants were cut to and the concentration of ash in the residual material was 1 m height and the thick stems were separated from the determined by combustion at 600 ºC for 3 h (AOAC, 1990; leaves and thin stems. This fraction and the grass Cynodon method 942.05). dactylon cv. Tifton 85 were sun-dried. The carbohydrate fractions were obtained using the Five crossbred dairy goats (Saanen × Boer) with methodology described by Sniffen et al. (1992) (Table 3). an initial weight of 46.5 kg and 1.5 kg milk/day, in mid- Saponins were identified by dissolving the extract in lactation, were arranged in a 5 × 5 Latin square. The water with constant stirring. The formation and persistence animals were kept in individual pens with apparatus for (for 15 min) of foam indicates the presence of saponins in total collection of feces. Each experimental period lasted plant extracts (Dewick, 2002). 11 days: seven for adaptation to the diet and four for the Samples of rumen contents were collected by an collection of samples and data. esophageal tube and a vacuum pump four hours after meal on Diets were isonitrogenous, with 14% crude protein the 11th day of each experimental period for determination (CP), and were composed of 40% concentrate and 60% of pH and N-NH3 concentration in the rumen fluid. The hay (dry matter basis) (Table 1). The treatments were the pH was measured immediately after collection. For the levels of inclusion of legume hay (Flemingia macrophylla) quantification of the ammonia concentration, 50 mL of replacing grass hay (Cynodon dactylon cv. Tifton 85) in the rumen fluid were filtered and 1 mL of sulfuric acid - H2SO4 forage part of the diet. (1:1) was added to the filtrate and subsequently distilled over The treatments were the following: Control - 60% potassium hydroxide - KOH 2N (Vieira, 1980). Cynodon dactylon hay + 40% concentrate; 8% Flemingia The observation of the feeding behavior began on the macrophylla hay + 52% C. dactylon hay + 40% concentrate; 5th day of each experimental period and lasted 24 h. The 16% F. macrophylla hay + 44% C. dactylon hay + 40% interval between observations was 20 min, as validated concentrate; 24% F. macrophylla hay + 36% C. dactylon hay + 40% concentrate; and 32% F. macrophylla hay + 28% C. dactylon hay + 40% concentrate. Table 2 - Ingredients and chemical composition of the diets The diet was formulated according to the nutritional according to the level of the Flemingia hay requirements of goats (NRC, 2007) (Table 2). The goats Flemingia level received feed twice daily to allow for 15% of leftovers in Ingredient 0% 8% 16% 24% 32% relation to the total offered, thus ensuring animal selectivity Cynodon dactylon hay (%) 60 52 44 36 28 Flemingia macrophylla hay (%) 0 8 16 24 32 and the voluntary feed intake. The animals received water Corn meal (%) 36.2 36.6 36.8 37.2 37.5 and mineral mixture for goat ad libitum. Soybean meal (%) 3.8 3.4 3.2 2.8 2.5 The samples of feed, orts, and feces were oven-dried Nutrient at 55 ºC and finely ground (1 mm). These samples were Dry matter (%) 83.0 83.7 84.0 84.7 85.3 analyzed for dry matter (DM), crude protein (CP), ether Organic matter (%DM) 95.5 95.5 95.6 95.6 95.7 Crude protein (%DM) 14.0 14.0 14.0 14.0 14.0 extract (EE), and total ash using AOAC methods 934.01, Ether extract (%DM) 2.7 2.9 3.0 3.1 3.2 976.05, 954.02, and 942.05, respectively (AOAC, 1990). Neutral detergent fiber(%DM) 47.4 46.8 46.2 45.6 45.0 Acid detergent fiber(%DM) 22.4 23.4 24.5 25.5 26.6 The concentrations of neutral detergent fiber (NDFom) Lignin (%DM) 3.5 4.8 6.1 7.6 8.8 and acid detergent fiber (ADF) were determined using Total carbohydrates (%DM) 78.6 78.5 78.4 78.3 78.2 the method proposed by VanSoest et al. (1991). NDF Non-fibercarbohydrates(%DM) 33.0 33.6 34.1 34.7 35.2 Mineral matter (%DM) 4.45 4.45 4.41 4.36 4.30 analysis was not performed in the presence of α-amylase Table 1 - Chemical composition of the diet ingredients Table 3 - Fractionation of carbohydrates and lignin content in Corn Soybean Component Flemingia Tifton 85 Flemingia macrophylla and Tifton 85 hays meal meal Dry matter (%) 86.76 83.76 87.16 87.23 Component Tifton 85 Flemingia macrophylla Crude protein (%DM) 16.32 14.53 9.15 52.37 Total carbohydrates (%DM) 76.9 74.2 Ether extract (%DM) 3.40 2.06 3.97 1.62 Fraction “C” (%DM) 12.1 49.6 Neutral detergent fiber(%DM) 61.30 68.93 15.28 14.06 Fraction “B2” (%DM) 56.8 11.7 Acid detergent fiber(%DM) 47.59 34.45 3.78 9.88 Non-fibercarbohydrates(%DM) 8.0 12.9 Mineral matter (%DM) 6.08 6.44 1.73 6.76 Lignin (%DM) 5.06 20.66 R.
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