Abstract Studies that explore the use of lipids and their effects on animal nutrition have become increasingly abundant, producing a mass of information. The review was carried out on a parity basis through a survey of articles in the bibliographic databases: Web of Science and Periodicals Capes, using search terms associated or not, in the plural or singular, in English and Portuguese, such as: “lipids” AND “rabbits" AND "nutrition". After analyzing the files in the two scientific databases, certain files were excluded because they did not fit the theme or because they did not meet the inclusion criteria and repeated articles. A relevance test was carried out for the use of the articles, where they should deal with the subject: articles that report the use of lipids in the nutrition of non-ruminant animals; articles made available in complete form; articles that had at least one of the keywords; articles where the main subject is related to lipids. The articles were selected and tabulated in an Excel® spreadsheet with relevant information for exploration in the review. The use of oils and fats is a favorable point in the nutrition of non-ruminant animals, presenting benefits in the enrichment of final products such as: providing higher levels of omega-3 and omega-6, and thus obtaining meat products with lower levels of saturated fat and higher unsaturated fat contents promoting benefits to human health through its consumption, reduction of food costs, improvement in palatability and appearance of foods. These are nutritional strategies used in hot seasons of the year due to the low calorific increment produced.

Resumo Estudos que exploram o uso de lipídios e seus efeitos na nutrição animal têm se tornado cada vez mais abundantes, produzindo uma grande quantidade de informações. A revisão foi realizada de forma paritária por meio de uma pesquisa de artigos nas bases bibliográficas: Web of Science e Periódicos Capes, utilizando termos de busca associados ou não, no plural ou no singular, em inglês e português, tais como: "lipídios" E "coelhos" E "nutrição". Após analisar os arquivos nas duas bases científicas, determinados arquivos foram excluídos porque não se adequavam ao tema ou não atendiam aos critérios de inclusão, além de artigos repetidos. Um teste de relevância foi realizado para a seleção dos artigos, nos quais eles deveriam tratar do assunto: artigos que relatam o uso de lipídios na nutrição de animais não-ruminantes; artigos disponibilizados na forma completa; artigos que possuíam pelo menos uma das palavras-chave; artigos nos quais o assunto principal está relacionado a lipídios. Os artigos foram selecionados e tabulados em uma planilha do Excel® com informações relevantes para exploração na revisão. O uso de óleos e gorduras é um ponto favorável na nutrição de animais não-ruminantes, apresentando benefícios no enriquecimento de produtos finais, tais como: fornecer níveis mais altos de ômega-3 e ômega-6, e assim obter produtos de carne com menores teores de gordura saturada e maiores teores de gordura insaturada, promovendo benefícios para a saúde humana por meio do consumo, redução dos custos alimentares, melhoria na palatabilidade e aparência dos alimentos. Essas são estratégias nutricionais usadas nas estações quentes do ano devido ao baixo incremento calórico produzido.

ABSTRACT. The objective of this study was to evaluate the performance and digestibility of diets containing different levels of crude propolis for growing rabbits. Forty-eight New Zealand White rabbits, 43 days old, of both genders, were used, distributed in a completely randomized design. There were four diets with different inclusion levels of crude propolis (0.0; 0.5; 1.0 and 1.5%). There was no statistical difference for performance regarding the inclusion levels of crude propolis (p = 0.85), as well as for the variables dry matter consumption, neutral detergent fiber and acid detergent fiber (p ≥ 0.07). Crude protein consumption showed a statistical difference in relation to gender (p = 0.04): males showed higher consumption. However, final weight, total weight gain, daily weight gain and feed efficiency were not influenced by the addition of crude propolis (p ≥ 0.37). Dry matter digestibility, crude protein, neutral detergent fiber and acid detergent fiber were not influenced by the inclusion levels of crude propolis in the diets (p ≥ 0.12). This study indicates that the inclusion of raw propolis up to 1.5% in the diets does not affect the performance parameters of rabbits.

RESUMO O objetivo com o trabalho foi avaliar a viabilidade econômica da suplementação de L-arginina em dietas para matrizes suínas durante a fase de lactação. Um estudo de caso descritivo foi realizado para identificar a viabilidade econômica da suplementação de L-arginina na ração de lactação, em relação à dieta controle, sobre o desempenho produtivo de matrizes suínas hiperprolíficas e suas leitegadas. O estudo foi realizado em uma granja comercial localizada no estado de Minas Gerais. Analisou critérios de viabilidade como o produto físico marginal (MPPg) e margem bruta (GM) no cenário de eficiência técnica e econômica, que foram comparados com o GM no grupo controle. A eficiência técnica foi estabelecida em 0,71% de L-arginina no consumo diário de ração de acordo com trabalho de campo prévio realizado pelos autores, enquanto a eficiência econômica obtida neste estudo foi de 0,43% de suplementação. A relação entre o preço da L-arginina e o preço de venda dos leitões determinou diretamente a viabilidade econômica, comparado ao grupo controle. Assim, considerando inicialmente o preço de um leitão como R$ 9,76/kg, o custo da L-arginina não deve exceder 6,61 vezes esse valor; isto é, estima-se em até R$ 64,50. Portanto, ao preço final de L-arginina de R$ 54,88, um leitão deve ser vendido ao preço de R$ 8,30/kg para tornar a suplementação de L-arginina na dieta de matrizes suínas em fase de lactação economicamente viáveis.

ABSTRACT The objective of this study was to evaluate the economic viability of L-arginine supplementation in diets for sows during the lactation phase. A descriptive case study was carried out to identify the economic viability of the supplementation of L-arginine in the lactation ration, in relation to the control diet, on the productive performance of hyper prolific sows and their litters. The study was carried out on a commercial farm located in the state of Minas Gerais. It analyzed feasibility criteria such as the marginal physical product (MPPg) and gross margin (GM) in the scenario of technical and economic efficiency, which were compared to the GM in the control group. Technical efficiency was established at 0.71% of L-arginine in daily feed intake according to previous fieldwork by the authors, while economic efficiency obtained in this study was 0.43% supplementation. The relationship between the L-arginine price and the sale price of the piglets directly determined the economic viability, compared to the control group. Thus, initially considering the price of a piglet as R$ 9.76/kg, the cost of L-arginine should not exceed 6.61 times this value; that is, it is estimated at up to R$ 64.50. Therefore, at the final price of L-arginine of R$ 54.88, a piglet should be sold at a price of R$ 8.30/kg to make the supplementation of L-arginine in the diet of lactation-phase swine economically possible.

ABSTRACT The objective of this study was to evaluate the effect of L-arginine supplementation in lactation diets on the productive and reproductive performance of pluriparous sows and their litters. Seventy-six sows of the same genetic line were assigned to four treatments in a completely randomized design with 19 replicates. The experimental unit was the sow and its respective litter. Treatments comprised a control diet (no L-arginine supplementation) and other three diets obtained by top dressing the control diet with 0.5, 1.0, and 1.5% of L-arginine. L-arginine supplementation had no effect on any performance variables, body condition, milk production, or weaning-estrus interval. There was a quadratic effect on percentage of protein and fat in milk as well as on the daily production of these components. Protein and fat percentage declined during lactation. Adding L-arginine to the diet had a quadratic effect on piglet weight at 13 and 21 days, the optimal level of L-arginine supplementation being estimated as 0.64% and 0.71%, respectively. L-arginine supplementation had a quadratic effect on the weight gain of piglets during the first 13 days and on total period of lactation, the optimal level of L-arginine supplementation being estimated as 0.60% and 0.70%, respectively. Supplementing lactation diets with 0.70% of L-arginine, corresponding to 45 g day−1, improves the weight gain of piglets by improving the nutritional quality of sow milk.