Desempenho de novilhos em Panicum maximum JACQ. CV. tanzânia sob regime de desfolhação intermitente.

Diante disso, o objetivo desse trabalho foi avaliar o desempenho de novilhos em ?Panicum maximum Jacq. cv. Tanzânia? sob regime de desfolhação intermitente, submetido a duas intensidades de desfolhação

Desempenho de novilhos suplementados em Panicum maximum JACQ. CV. Tanzânia sob regime de desfolhação intermitente.

Dessa forma, o objetivo desse trabalho foi avaliar o desempenho de novilhos em capim-tanzânia, sob regime de desfolhação intermitente, submetido a duas intensidades de desfolhação, durante o período seco

Produção de forragem e desempenho de novilhos em pastos de capim Mombaça sob pastejo rotativo.

O manejo do pastejo em plantas forrageiras tropicais pode promover incrementos na eficiência de produção, utilização ou colheita da forragem produzida. O objetivo nesse trabalho foi avaliar a produção de forragem e o desempenho de novilhos em Panicum maximum Jacq. cv. Mombaça sob pastejo rotativo

Maintaining post-grazing sward height of Panicum maximum (cv. Mombaça) at 50 cm led to higher animal performance compared with post-grazing height of 30 cm.

In swards of tall, tufted, tropical grasses like Mombaça guinea grass (Panicum maximum (Jacq.)), post-grazing heights promote changes in sward structure, which influence animal performance. This study evaluated changes in sward structure in response to grazing management at two post-grazing heights (30 and 50 cm), associated ith 90 cm pre-grazing height. Each treatment was allocated to experimental unit (1.5 ha) in three replicated blocks. Pastures were evaluated pre- and post-grazing to estimate herbage mass, percentages of leaf (LP), stem (SP) and dead material (DP), and nutritive value (VN). Stocking rate was adjusted twice a week “using the put-and-take approach,” and animals were weighed every 28 days. Forage accumulation rate was greater for pasture managed at 30 cm (64.8 vs. 55.1 kg ha -1 day -1) than 50 cm. A greater number of days were required after grazing 30-cm residual pasture to achieve the pre-grazing target height, resulting in 25% decrease in number of grazing cycles compared with pastures managed at 50 cm. Regardless of post-grazing height targets, SP and DP decreased, whereas LP and NV increased from soil level to top of canopy. Stocking rate was greater in pastures managed to 30 cm than in those managed to 50 cm residual height (4.7 vs. 3.4 AU ha -1). However, average daily gain was greater for 50 cm than for 30 cm post-grazing height (795 vs. 590 g steer -1 day -1), resulting in a greater animal production per area (917 vs. 794 kg/ha of live weight). Thus, Mombaça guinea grass subject to intermittent grazing should be managed at 50 cm residual height

Produtividade de pastos de capim-piatã sob lotação contínua.

As características estruturais do pasto podem ser modificadas com o manejo do pastejo. Tais modificações, podem afetar a capacidade dos animais em colher a forragem disponível e, consequentemente, o ganho individual e por área. O objetivo desse estudo foi avaliar características estruturais em pastos de Brachiaria brizantha cv. Piatã submetidos à intensidades de pastejo de 15, 30 e 45 cm de altura do dossel, sob lotação continua

Animal Performance with and without Supplements in Mombaça Guinea Grass Pastures during Dry Season.

The objectives were to: 1) evaluate the potential of the animal performance on Panicum maximum cv. Mombaça (mombaça guinea grass) pasture during dry season, and 2) determine the effects of protein or protein-energy supplementation on liveweight gain of steers grazing guinea grass pasture. A complete randomized block design was employed with three treatments and three replicates. Treatments included non-supplemented animals (NS) and animals supplemented with protein (PS) or protein-energy (PES), provided at 0.15% or 0.6% of body weight for 115 days, during dry period. We used 36 weaned calves from initial bodyweigh (LW) of 192 kg (±5 kg) on nine plots of mombaça guinea grass (1.25 ha each). Each month, animals were weighed and pastures sampled to estimate forage characteristics. The average daily gain (ADG) was greater (P = 0.0001) for cattle fed supplement than for cattle fed no supplement (250 g steer-1), and greater for protein-energy supplement (770 g steer-1) than for protein supplement (460 g steer-1). Mombaça guinea grass pastures with 45 cm height at the end of the wetseason have enough forage mass for maintenance throughout the dry season about 1.4 AU ha-1 (AU = 450 kg BW), and reasonable nutritive value (average of 8,1% of crude protein and 55,3% of in vitro organic matter digestibility) to provide small gains. Considering the nutritive value of Mombaça guinea grass during the dry period, protein and energy supplementation is required for weaned calves to optimize their performance

Características morfogênicas do capim-marandu sob lotação contínua.

O conhecimento da morfogênese das plantas é de importância fundamental para que se possa tomar decisões de manejo das pastagens. As características morfogênicas influenciam estruturais, que por sua vez podem modificar o comportamento dos animais em pastejo. O objetivo do trabalho foi avaliar as características morfogênicas do capimmarandu, submetido a intensidades de pastejo em lotação contínua

Grazing intensity affects forage accumulation and persistence of Marandu palisadegrass in the Brazilian savannah.

This 3?year study evaluated the effects of grazing intensity on herbage and steer responses in continuously stocked Brachiaria brizantha cv. Marandu pasture in the Brazilian savanna. Treatments consisted of three grazing intensity levels, characterized by canopy heights of 15, 30 and 45 cm, measured twice per week. Responses variables included tiller population density (TPD), herbage accumulation rate (HAR) and body weight gain per area (WGA). A decline in TPD (1,237 vs. 767 tillers/m2) was observed from the first to the third grazing years, which influenced the HAR from the first to the third years (90.1 vs. 52.4 kg ha?1 day?1). A marked decline in body WGA (541 vs. 276 kg ha?1 year?1) was observed along the three years in pastures managed at a height of 15 cm, indicating that this is an unstable condition for Marandu palisadegrass pasture. HAR was similar for pastures managed at 30 or 45 cm and was relatively stable during the experimental period, averaging 91.8 and 99.1 kg ha?1 day?1 respectively. Body WGA was similar and constant throughout the experimental period for pastures managed at 30 (596 kg ha?1 year?1) and 45 cm (566 kg ha?1 year?1). Maintaining continuously stocked Marandu palisadegrass pastures at a 15 cm canopy height should be avoided due to long?term decreases in plant persistence and animal body WGA, particularly when soil P is below critical levels at pasture establishment and during pasture utilization