ResumoO objetivo do presente trabalho foi avaliar o comportamento produtivo e qualitativo dos constituintes estruturais da pastagem de Tifton 85, no período de maio a setembro de 2010, submetido ao pastejo. O experimento foi realizado no município de Luiziana, região Noroeste do estado do Paraná. Avaliouse a produção total de massa de forragem, de lâminas foliares, colmos e material morto e a relação folha:colmo. A composição química-bromatológica foi determinada por meio das análises de fibra em detergente neutro (FDN) e ácido (FDA), proteína bruta (PB), e estimados os valores de nutrientes digestíveis totais (NDT) e digestibilidade da matéria seca (DMS). Também foi avaliada a taxa de lotação e a oferta de forragem. Verificou-se diminuição na massa de forragem, de lâminas foliares, colmos e material morto, consequentemente, reduziu-se a oferta que variou de 11,07 a 13,64 kg MS/100kg de peso vivo. As lâminas foliares apresentaram diminuição da qualidade com o avanço dos períodos experimentais em virtude de seus teores de FDN e PB. Os demais constituintes não apresentaram diferenças no período de março a setembro, evidenciando que a pastagem de tifton 85 mantém seus valores nutritivos elevados mesmo em períodos críticos do ano, diminuindo apenas sua produtividade. Palavras-chave: Massa de forragem, variações climáticas, qualidade bromatológica AbstractThe objective of this study was to evaluate the production and quality of structural components of Tifton 85 pasture, in the period from May to September 2010, submitted to the grazing. The experiment was carried out at Luiziana, Northwest region of Paraná State. It was evaluated the total production of forage mass, leaf blades, stems and dead material, and the leaf:stem ratio. The chemical-bromatological composition was determined through analysis of neutral detergent fiber (NDF), acid detergent fiber (ADF), crude protein (CP), and estimated valuesof total digestible nutrients (TDN) and dry matter digestibility (DMD). Stocking rate and forage allowance were evaluated. It was verified a decrease in forage mass, leaves blades, stems and dead material, and therefore decreased the supply ranging from 11.07 to 13.64 MS/100kg kgbody weight. The leaf blades showed a decrease in quality with the advance of trial periods due to their NDF and CP content. The other constituents did not differ in the period from
The objective of this study was to define the input height to grazing and evaluate forage production of Italian ryegrass (Lolium multiflorum Lam.) cv. Barjumbo and cv. Common associated or not with oat black forage (Avena strigosa Schreb) cv. IAPAR 61, submitted to two post-grazing. Treatments consisted of a 4x2 factorial design, totaling eight treatments with three replications, being evaluated common and Barjumbo ryegrass, single and mixed with black oat in two highs of post-grazing residue: High: 50% of input height; Low: 30% of input height. Single Common ryegrass and combined with black oat obtained higher production than Barjumbo cultivate, and greater accumulation rate only when intercropped with black oat. Leaf blades production did not differ among cultivars. Stems production was low to Barjumbo cultivar. Black oat production was higher when associated with Barjumbo. Input height to Italian ryegrass cultivars with 95% light interception was 26.86 cm to Barjumbo and 28.75 cm to common cultivar, and when combined with black oat 34.01 cm and 32.48 cm, respectively. Key words: Avena strigosa Schreb. Barjumbo. Stem. Leaf blade. Lolium multiflorum. ResumoO objetivo deste estudo foi definir a altura de entrada para pastejo e avaliar a produção de forragem do azevém (Lolium multiflorum Lam.) cv. Barjumbo e do azevém comum (Lolium multiflorum) consorciados ou não com aveia (Avena strigosa Schreb) cv. IAPAR 61 submetidos a resíduos de pastejo. Os tratamentos foram constituídos de um bifatorial 4x2, totalizando oito tratamentos com três repetições, sendo avaliados os azevém comum e Barjumbo solteiros e consorciados com aveia preta em duas alturas de resíduo pós-pastejo: Alto: 50% da altura de entrada; Baixo: 30% da altura de entrada. O azevém comum solteiro e no consórcio com aveia obteve maior produção que o cultivar Barjumbo, e maior taxa de acúmulo apenas quando consorciado com aveia. A produção de folhas não diferenciou entre os cultivares, apenas a produção de colmo que foi menor para o cultivar Barjumbo. A produção de aveia foi maior quando consorciada com o cultivar Barjumbo. A altura de entrada para os cultivares de azevém com 95% de interceptação luminosa foi de 26,86 cm para o Barjumbo e 28,75 cm para o comum, e quando consorciados com aveia de 34,01 cm e 32,48 cm, respectivamente. Palavras-chave: Avena strigosa Schreb. Barjumbo. Colmo. Lâmina foliar. Lolium multiflorum.
The use of animals from dairy farms is an alternative to meat production since it provides an increment of total income for farmers. This study aims to evaluate the performance of Holstein calves finished in two feeding systems (feedlot or pasture). Forty-three animals with 58 days old and 57 kg were divided in two treatments: 23 animals finished in feedlot with corn silage plus concentrate based on corn and soybean meal (40:60); 20 animals kept in cultivated pastures according to the period of the year: Italian ryegrass (Lolium multiflorum) and pearl millet (Pennisetum americanum) with supplementation with the same feedlot-concentrate at 1% body weight. Animals were slaughtered with 200 kg. Dry matter and nutrient intake were determined, with the use of chromium oxide for estimating pasture intake. Feedlot animals had greater total intake and total digestible nutrients, resulting in higher average daily gain (0.949 vs 0.694 kg day -1 ). Crude protein intake, neutral detergent fiber and feed conversion did not show significant differences. Holstein calves have improved performance when finished in feedlot.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
334 Leonard St
Brooklyn, NY 11211
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.