ABSTRACT
The objective of this study was to assess the impact of nitrogen fertilization on M. maximus cv. Aruana cultivated in silvopastoral and full-sun systems, focusing on morphogenetic, structural, and productive traits, as well as chemical composition. Silvopastoral systems promote productive efficiency and sustainability in animal husbandry, leading to improved herbage quality and enhanced thermal comfort for the animals. Nitrogen fertilization affects the growth of tropical forages. The study evaluated the system used (silvopastoral or full sun), the presence of fertilization (with or without), and distinct intervals (21, 42, 63, or 84 days) on productive and morphogenetic traits of the forage. The silvopastoral system exhibited increased canopy height, while the full-sun condition favored dry matter production and animal weight gain. Fertilization benefited basal tiller density and morphogenesis. The crude protein content was higher in full sun. Full sun displayed benefits in terms of both herbage production and composition, whereas the silvopastoral system excelled particularly in terms of canopy height. Fertilization improved several traits, fostering tissue turnover. The study highlights the importance of proper management in silvopastoral systems to optimize herbage production and quality.(AU)
O objetivo do presente trabalho foi avaliar o efeito da adubação nitrogenada em M. maximus cv. Aruana cultivado em sistema silvipastoril e pleno sol sobre as características morfogênicas, estruturais, produtivas e composição química. Sistemas silvipastoris promovem eficiência produtiva e sustentabilidade na produção animal, melhorando a forragem e o conforto térmico. A adubação nitrogenada afeta o crescimento de forrageiras tropicais. O estudo avaliou o sistema utilizado (silvipastoril e pleno sol), adubação (com e sem) e períodos (21, 42, 63 e 84 dias) em características produtivas e morfogênicas da forrageira. O sistema silvipastoril elevou a altura do dossel, enquanto o pleno sol favoreceu a matéria seca e ganho de peso animal. A adubação beneficiou a densidade de perfilhos basais e morfogênese. O teor de proteína bruta foi maior no pleno sol. Pleno sol teve vantagens na forragem e composição, enquanto o silvipastoril destacou-se na altura do dossel. A adubação melhorou várias características, incentivando renovação tecidual. O estudo destaca a importância do manejo adequado em sistemas silvipastoris para otimizar produção e qualidade forrageira.(AU)
Subject(s)
Nitrogen Compounds/adverse effects , Fertilizers/analysis , Poaceae/physiologyABSTRACT
The objective of this work was to evaluate the quantitative and qualitative characteristics of carcass and meat of Dorper x Santa Ines crossbred lambs finished in a silvopastoral system, pasture or feedlot. Twentyfour non-castrated male lambs were used (8 animals in each production system). The experimental design was completely randomized, with three production systems and eight replications. The production systems were: pasture of Megathyrsus maximus cv. Aruana, without shading + feed supplementation (Pasture); pasture of Megathyrsus maximus cv. Aruana, with natural shading provided by the native laurel tree (Cordia trichotoma) + feed supplementation (Silvopastoral) and feedlot. The cold carcass weight, empty body weight, cold carcass yield, fat color, fat consistency and carcass compactness index showed significant differences (P < 0.05) between production systems, with higher values observed in the feedlot. The shoulder weight and the percentage of shoulder components (bones, muscle, fat and others), did not significantly differ (P > 0.05) between production systems. The pasture silvopastoral systems presented similar results and also, when contrasted with the feedlot system, did not influence the parameters related to meat. Feedlot provided better quantitative and qualitative characteristics to the lambs' carcassess.(AU)
O objetivo deste trabalho foi avaliar as características quantitativas e qualitativas da carcaça e da carne de cordeiros mestiços Dorper x Santa Inês terminados em sistema silvipastoril, a pasto e confinamento. Foram utilizados 24 cordeiros machos não castrados (8 animais em cada tratamento). O delineamento experimental foi inteiramente casualizado com três tratamentos e oito repetições. Os tratamentos foram: pastagem de Megathyrsus maximus cv. Aruana, sem sombreamento + suplementação alimentar (Pastagem); pastagem de Megathyrsus maximus cv. Aruana, com sombreamento natural proporcionado pela espécie arbórea Louro-Pardo Nativo (Cordia trichotoma) + suplementação alimentar (Sivilpastoril) e confinamento em aprisco. O peso de carcaça fria, peso de corpo vazio, rendimento de carcaça fria, cor da gordura, consistência da gordura e índice de compacidade da carcaça apresentaram diferença significativa entre os tratamentos (P < 0.05), com valores superiores observados no confinamento. O peso das paletas e a porcentagem dos componentes da paleta (ossos, músculo, gordura e outros), não diferiram significativamente (P > 0.05) entre os sistemas de produção. Os sistemas a pasto sem sombreamento e silvipastoril apresentaram resultados similares, e quando contrastados ao confinamento não apresentaram influência nos parâmetros relacionados a carne. O confinamento proporcionou melhores características quantitativas e qualitativas às carcaças dos cordeiros.(AU)
Subject(s)
Animals , Body Weight , Sheep , Pasture , MeatABSTRACT
This research aimed to evaluate the effect of 5% aqueous extracts of marjoram (Origanum majorana L.) and pomegranate (Punica granatum L.) on Cobb chicken (Gallus gallus domesticus L.), as a model to birds as non-target organisms for pest control. The extracts were prepared using dried ground leaves. The powder obtained was then added to distilled water to obtain 5% extract (w/v). After 48 h, the plant extracts were filtered and added to the feed of 36 female birds. For that, the chicken (12 days old) were acclimated for 3 days before starting the experiment. The plant extracts were administered for 6 days, always preceded by at least 14-h starvation. The birds were evaluated for 11 days, assessing behaviour, feed consumption and animal performance. After sacrificing the birds, histopathological examination was performed, and intestinal villi were measured. No death nor any alteration occurred during the experiment. There was no statistical difference among the treatments regarding feed consumption and performance even though there was intestinal villi reduction.