Objetivou-se avaliar o efeito da suplementação com dois níveis de concentrado na dieta de ovelhas no terço final da gestação sobre como afetam o consumo de matéria seca e metabólitos sanguíneos. Os experimentos foram realizados em 41 ovelhas com peso médio de 64,2 kg. Os animais foram alojados em baias onde os tratamentos consistiam em dois níveis de concentrado como suplemento, distribuídos inteiramente ao acaso com medidas repetidas ao tempo (de acordo com a previsão de parto dos animais). A dieta foi composta por silagem de milho e concentrado na forma de suplemento, ofertada às 08:00 e 16:00 horas, sendo fornecidas ao animal de forma a obter 10% de sobras do total ofertado de ração. As médias dos tratamentos foram avaliadas pelo teste de Tukey ao nível de significância de 5%. Para as avaliações do período utilizou-se estudo de regressão ao nível de significância de 5%. Dentre as variáveis analisadas, o consumo de matéria seca aumentou ao longo de todo o período experimental. Com relação aos metabólitos energéticos houve diferença apenas para o período analisado com aumento do LDL. Em relação às enzimas de atividade hepática, somente a aspartato amino transferase sofreu influência do período de avaliação. Sobre os metabólitos proteicos, ureia, creatinina e albumina sofreram efeito de redução ao longo do período experimental. A suplementação de ovelhas gestantes no terço final da gestação foi eficiente em melhorar o consumo no terço final da prenhez, sem causar danos metabólicos aos animais.
Objetivou-se avaliar o efeito da inclusão de fontes lipídicas com diferentes sítios de degradação sobre o perfil metabólico de ovelhas gestantes. O experimento foi realizado na Universidade Federal de Uberlândia, na Fazenda Experimental Capim Branco, durante os meses de agosto a novembro de 2015, tendo 90 dias de duração. Foram utilizadas 24 ovelhas gestantes com peso corporal médio de 50,8±0,7 kg e idade aproximada de 12±1 meses. Os animais foram divididos em três tratamentos: Controle, Nutrigordura® e Caroço de Algodão. O volumoso utilizado foi a silagem de milho, e a relação volumoso:concentrado foi de 60:40 (na matéria seca). As coletas de sangue para determinação dos metabólitos proteicos, energéticos e hepáticos foram feitas a cada 15 dias e as análises da concentração de betahidroxibutirato (BHB) foram feitas aos 120, 135 e 140 dias de gestação. O delineamento utilizado foi inteiramente casualizado com medidas repetidas ao tempo. Houve diferença estatística no perfil metabólico energético das ovelhas entre os tratamentos para lipoproteína de alta densidade (HDL) e betahidroxibutirato (BHB) no pré-parto. Para o colesterol e lipoproteína de baixa densidade (LDL) houve interação entre tratamento e período. Não houve diferenças significativas para os metabólitos hepáticos em função dos tratamentos, apenas para o período. Em relação ao metabolismo proteico, houve interação para a variável ácido úrico. A suplementação lipídica com diferentes perfis de degradação foi eficiente em manter o metabolismo energético, hepático e proteico dos animais alterando a concentração de alguns metabólitos no sangue durante os terços médio e final da gestação.
Highlights: A higher proportion of concentrate in lambs' feed provides less dry matter intake. The concentration of blood metabolites was higher when the DMI% BW was high. The diets were efficient in maintaining the animals' metabolic conditions. The maintained metabolic conditions, associated with the dry matter intake, may favour the performance of growing lambs.
Feed consumption has a great influence on the growth and performance of animals since the intake of dry matter supplies the quantity of nutrients that are necessary to meet the maintenance and production requirements of these animals. The objective of this study was to evaluate the dry matter intake, body growth, weight gain and carcass characteristics (by ultrasonography) of lambs fed an extruded ration at different roughage (R): concentrate (C) ratios. Thirty mixed race (Santa Inês x Dorper) lambs, aged 3 months and with an average weight of 20 kg, were used. The treatments consisted of an extruded ration in 30R:70C and 70R:30C ratios, completely randomised to 2 treatments and 15 replicates. The means of the variables were evaluated using a Tukey test and a regression at the 5% significance level. Dry matter intake (DMI), weight gain, body growth, evaluated through biometric measurements, and carcass characteristics, evaluated by ultrasonography, were assessed. There was a reduction of DMI in relation to body weight during the experimental period, with lower DMI amongst the animals in the 30R:70C treatment. There was a quadratic effect for the growth variables hindlimb height, forelimb height, body length, thoracic and barrel circumference over time, indicating that the animals presented adequate body growth, with intense development during the experimental period and stabilisation at the end of the experiment. There was no difference in the animals' weight gain, with an average daily gain of 182.79 g day-1. There was a difference in carcass characteristics throughout the evaluation period, with a larger loin eye area, body condition score and subcutaneous fat thickness at the end of the experimental period. The use of an extruded ration with a 30% roughage and 70% concentrate ratio promotes better feed efficiency in lambs, since it achieved the same weight gain and body development with lower dry matter intake.
The purpose of this study was to evaluate the effects of docosahexaenoic in the concentrated acid on intake, digestibility, metabolic profile and ingestive behavior of lambs diets. Five crossbred Dorper x Santa Inês lambs with initial age and body weight average of six months and 33 kg, respectively, were used in the trial. The animals were assigned into a 5×5 Latin square design and they received one of the following treatments: 0, 1.5, 3, 4.5 and 6 % of microalgal product (Aurantiochytrium limacinum algae) or ALL-G Rich® in the concentrate. The diets were composed of corn silage and concentrate offered twice daily. During the experimental period, feed, water, feces, blood, and urine were sampled to calculate the intake and digestibility and to characterize the metabolic profile. The ingestive behavior was measured during 24 hours on the last day each experimental period. The time spent on feeding, ruminating and idle activities was measured. Regression analyses were performed considering 5 % of significance. There were no difference on nutrients intake, digestibility, and ingestive behavior with the inclusion of ALL-G Rich® in the diet (p>0.05). There was a significant effect on serum concentrations of cholesterol, low density lipoprotein, alkaline phosphatase and gammaglutamyl transferase, however, all metabolites remained within the range recommended for the animal category. Thus, ALL-G Rich® can be used up to 6% in the concentrate, on dry matter basis, of lambs diet without affect intake, digestibility, metabolic profile, and ingestive behavior.
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