18 research outputs found

    Performance of rearing female hoggets under different feeding strategies

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    The objective of this study was to evaluate the performance of Texel × Ile de France female hoggets on pearl millet (Pennisetum americanum (L.) Leeke) pastures fed supplementation with cassava meal or corn gluten. It was used a completely randomized experimental design, with three treatments (feed strategies) and two area replications. Feed strategies consisted of supplementation of the pastures with cassava meal or corn gluten in comparison to exclusive pasture. Supplements were given daily at 9:00 a.m. at quantity of 1% of the body weight (BW). The lambs on corn gluten supplementation presented greater daily weight gain and greater per area weight gain. Use of supplementation did not permit to increase pasture stocking rate, however. In vitro digestibility and chemical composition of the harvested forage was similar (crude protein, neutral detergent fiber) among groups. At the end of the experiment, all feed strategies were efficient in promoting weight greater than 60% of the mature weight, showing that the lambs are able for mating. Body condition score (BCS) of lambs under cassava meal supplementation was 3.0 whereas body composition score of the other lambs was 2.8. Exclusive use of pearl millet can provide dry matter requirement of the lambs

    Diferentes massas de forragem sobre as variĂĄveis morfogĂȘnicas e estruturais de azevĂ©m anual Different herbage masses on morphogenetic and structural traits of Italian ryegrass

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    CaracterĂ­sticas morfogĂȘnicas e estruturais de azevĂ©m (Lolium multiflorum Lam.) foram avaliadas sob pastejo de borregas, em diferentes massas de forragem (MF): "Alta", "MĂ©dia" e "Baixa", correspondentes a 1800-2000; 1400-1600 e 1000-1200kg ha-1 de matĂ©ria seca (MS), respectivamente. O delineamento experimental foi inteiramente casualizado, com trĂȘs tratamentos e duas repetiçÔes de ĂĄrea. O mĂ©todo de pastejo foi de lotação contĂ­nua, com nĂșmero variĂĄvel de animais. Os dados foram submetidos a anĂĄlises de correlação e regressĂŁo polinomial. A altura do pseudocolmo, o comprimento de lĂąminas intactas e desfolhadas e o nĂșmero de folhas em senescĂȘncia de azevĂ©m aumentaram linearmente com a elevação dos valores das massas de forragem. O nĂșmero de folhas verdes ajustou-se ao modelo de regressĂŁo quadrĂĄtico; o nĂșmero de folhas em expansĂŁo e a densidade populacional de perfilhos nĂŁo se ajustaram a nenhum modelo de regressĂŁo. Em pastagem de azevĂ©m, o manejo com massas de forragem dentro da faixa compreendida entre 1.100 e 1.800kg ha-1de MS nĂŁo provoca alteraçÔes nas caracterĂ­sticas morfogĂȘnicas dessa gramĂ­nea, mas causa diferenças nas caracterĂ­sticas estruturais do dossel. Quando o azevĂ©m Ă© manejado com 1.460kg ha-1de MS, seus perfilhos mantĂȘm maior nĂșmero de folhas verdes e com 1.800kg ha-1 de MS existe maior nĂșmero de lĂąminas foliares em senescĂȘncia e com maior comprimento.<br>Morphogenetic and structural characteristics of Italian ryegrass (Lolium multiflorum Lam.), utilized by female lambs and managed with different forage masses (FM) were studied. The experimental design was completely randomized, with two area replications and three treatments, consisting of forage masses: "High", "Mean" and "Low", corresponding to 1,800-2,000; 1,400-1,600 and 1,000-1,200kg ha-1 of dry matter (DM), respectively. The grazing method was continuous with variable stocking rate. Data were subjected to correlation analysis and polynomial regression. Pseudo stem's height and length of the intact and defoliated leaf blades and number of senescent leaves of Italian ryegrass increased linearly with the increase of forage mass. Number of green leaves was adjusted to the quadratic regression model, number of leaves in elongation and tiller population density did not adjust to any regression model. Management of Italian ryegrass with forage masses between 1,100 and 1,800kg ha-1of DM did not cause changes in its morphogenetic characteristics, but causes differences in the structural characteristics of the canopy. When managed with 1,460kg ha-1of DM, tillers of Italian ryegrass maintain greater number of green leaves. Meanwhile, when managed with 1,800kg ha-1of DM it has a higher number of leaf blades in senescence, and leaves with greater length

    PadrÔes de comportamento ingestivo de cordeiras recebendo ou não suplemento em pastagem de milheto Ingestive behavior patterns of ewe lambs receiving or not supplement on Pearl millet pasture

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    O comportamento ingestivo e os padrÔes de deslocamento e procura de forragem de cordeiras em pastagem de milheto (Pennisetum glaucum (L.)) foram avaliados quando estas foram mantidas exclusivamente em pastagem ou em pastagem recebendo suplemento (ração comercial fornecida diariamente às 17h. O delineamento experimental foi inteiramente casualizado, com duas repetiçÔes de årea. Os animais que receberam suplemento reduziram o tempo de pastejo e aumentaram o tempo destinado às outras atividades. Os padrÔes de ingestão, deslocamento e procura de forragem foram alterados pelas mudanças na estrutura do pasto ao longo dos estådios de desenvolvimento do milheto e não foram modificados pelo recebimento de suplemento.<br>The ingestive behavior and displacement and forage searching patterns of female lambs in Pearl millet (Pennisetum glaucum (L.)) were evaluated when lambs were kept exclusively on Pearl millet pasture and on pearl millet pasture receiving supplement. The supplement used was a commercial ration given daily at 17h. The experimental design was completely randomized, with two area replicates. The animals that received supplement reduced the grazing time and increased the idling time. The intake, displacement and forage searching patterns were influenced by changing on pasture structure along the Pearl millet stage of development and were not modified by supplement supply

    <b>MorfogĂȘnese e estrutura de azevĂ©m anual submetido a trĂȘs intensidades de pastejo</b> - doi: 10.4025/actascianimsci.v32i4.8657 <b>Morphogenesis and structure of Italian ryegrass submitted to three grazing intensities</b> - doi: 10.4025/actascianimsci.v32i4.8657

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    Estudaram-se caracterĂ­sticas morfogĂȘnicas e estruturais de azevĂ©m (<em>Lolium multiflorum</em> Lam.) sob intensidades de pastejo. O delineamento experimental foi inteiramente casualizado, com quatro repetiçÔes (transectas) e trĂȘs tratamentos constituĂ­dos por intensidades de pastejo: “Alta”, “MĂ©dia”, “Baixa”, correspondentes ao desaparecimento de 61,0; 43,3 e 21,1% do valor da massa de forragem inicial, respectivamente. O pastejo foi intermitente, com borregas, e o intervalo entre pastejos correspondeu Ă  soma tĂ©rmica de 313 graus-dia. As intensidades de pastejo afetaram a morfogĂȘnese e estrutura de azevĂ©m apenas no primeiro perĂ­odo de avaliação, quando o azevĂ©m na intensidade “MĂ©dia” apresentou as menores taxas de aparecimento e elongação foliar e os maiores valores de duração de vida das folhas. A altura do pseudocolmo, o comprimento de lĂąmina intacta e desfolhada, o nĂșmero de folhas intactas e em senescĂȘncia foram superiores na intensidade “Baixa”, sem diferir entre “MĂ©dia” e “Alta”. A adoção das intensidades de pastejo de 43,3 e 61,0% do desaparecimento do valor da massa de forragem inicial possibilita estender o estĂĄdio vegetativo do azevĂ©m anual. Para o manejo de azevĂ©m anual, recomenda-se o uso da intensidade de pastejo de 61,0%, que apresenta caracterĂ­sticas estruturais semelhantes Ă s observadas na intensidade 43,3% e proporciona taxa de lotação 24,1% superior.<br>Morphogenetic and structural characteristics of Italian ryegrass (<em>Lolium multiflorum</em> Lam) under grazing intensities were studied. The experimental design was completely randomized, with four repetitions (transects) and three treatments consisting of grazing intensities: ‘High’, ‘Mean’ and ‘Low’, corresponding to the disappearance of 61.0, 43.3 and 21.1% the value of initial forage mass, respectively. Intermittent grazing was used, with ewe lambs, and the interval among grazing corresponded to thermal sum of 313 degree-days. Grazing intensities affected the morphogenesis and structure of Italian ryegrass only in the first evaluation period; when Italian ryegrass in the ‘Mean’ intensity had the lowest leaf appearance rate and leaf elongation rate and it had the highest values of leaf life span. Pseudostem height, length of the intact and defoliated blades, number of intact and senescent leaves were higher in ‘Low’, and did not differ between ‘Mean’ and ‘High’. Adoption of grazing intensities equivalent to 43.3 and 61.0% of the disappearance of the initial forage mass allows extending the Italian ryegrass vegetative stage. For management of Italian ryegrass, the use of 61.0% grazing intensity is recommended, which presents structural characteristics similar to those observed in intensity of 43.3% and provides stocking rate 24.1% higher
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