Efeito do nitrogênio aplicado em pastagem nativa sobre o desempenho de cordeiras no pós-desmame

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Ingestive behavior of Angus yearling steers in natural grassland subjected to fertilization and over sown of temperate species

The objective was to evaluate the ingestive behavior of Angus yearling steers grazing natural grasslands of Southern Brazil, submitted or not to the application of fertilizers: NG= natural grassland; FNG= fertilized natural grassland, and FONG= fertilized natural grassland improved with the over sown of temperate forage species. Three Angus yearling steers and a variable number of put-and-take animals were used per experimental unit, to maintain a forage allowance of 13 kg of dry matter/100 kg of body weight. Ingestive behavior of tester animals was visually assessed in four seasons of the year through instantaneous records of activity every ten minutes during the daytime period. There was no effect of pasture treatments on ingestive behavior. An interaction between seasons and periods of the day was observed for daily grazing and rumination time (P <0.05). The grazing activities were clustered at the beginning and the end of the day in summer, autumn and winter, while in spring it was similar in the 1 st three quarters of the day, with higher activity in the period close to sunset. The animals spent more time grazing in the spring despite the better quality of forage in this season. Regardless of the season, longer residence and grazing time were found in water foci areas. We conclude that grazing time on natural pastures is influenced by forage mass and forage allowance, and bite rate is influenced by the chemical composition of the sward

Atributos físicos do solo sob intensidades de pastejo e métodos de pastoreio com cordeiros em integração lavoura‑pecuária

The objective of this work was to evaluate possible alterations in the soil bulk density and total porosity due to lamb trampling, under different grazing management after no-tillage summer crop. The experiment was carried out in the layers 0–2.5, 2.5–5 e 5–10 cm of an arenic Ultisol, in an annual ryegrass pasture with forage allowance of 2.5 and 5.0 of animal potential consumption, under continuous and rotational stocking. An ungrazed area was used as check. Grazing intensities and methods did not affect soil bulk density and total porosity. It is possible to use areas with this kind of soil texture, with cover crops for lamb grazing in the winter, without alterations on soil physical attributes, caused by animal trampling, reach harmful levels for subsequent crops.O objetivo deste trabalho foi avaliar possíveis alterações na densidade e na porosidade total do solo, em razão do pisoteio de cordeiros, sob diferentes manejos, após as culturas de verão em plantio direto. O experimento foi realizado em Argissolo Vermelho distrófico argiloso, nas camadas 0–2,5, 2,5–5 e 5–10 cm, em pastagem de azevém anual manejada com ofertas de forragem de 2,5 ou 5,0 vezes o potencial de consumo dos animais, em lotação contínua e rotacionada. Como testemunha, utilizou-se uma área não pastejada. As intensidades de pastejo e os métodos de pastoreio não tiveram efeito sobre a densidade e a porosidade total do solo. É possível utilizar, durante o inverno, áreas com este tipo de textura do solo, com culturas de cobertura para pastejo de cordeiros, sem que as alterações nos atributos físicos do solo, pelo pisoteio animal, atinjam níveis prejudiciais para as culturas subsequentes

Efeito do nitrogênio aplicado em pastagem nativa sobre o desempenho de cordeiras no pós-desmame

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Estado da arte em Paspalum notatum Flügge

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Efeito do manejo do pastejo na receita bruta de um sistema integração lavoura-pecuária na Depressão Central

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