Eloiza Lanferdini

Alimentação de leitoas pré-púberes com dietas contendo zearalenona

The performance, the weights of some organs, and the vulvae morphology in pre-pubertal gilts fed diets containing zearalenone were evaluated during 28 days. The experimental design was completely randomized with two treatments (control diet, ZD - control diet + 2mg kg -1 of zearalenone) and six replications of each were done. No differences (P>0.05) between treatments for daily feed intake (1.24 x 1.19kg), average daily gain (0.68 x 0.71kg), feed conversion ratio (1.86 x 1.71), and live weight (30.9 x 30.4kg) were observed. Zearalenone did not change (P>0.05) the absolute and relative weights of heart (137 x 141g and 0.45 x 0.45%BW), liver (699 x 699g and 2.31 x 2.26%BW), kidneys (47 x 49g and 0.15 x 0.16%BW), and spleen (166 x 171g and 0.55 x 0.55% BW). However, zearalenone increased (P<0.05) the length (17 x 27cm) and weight (23 x 157g and 0.07 x 0.51%BW) of the reproductive tract. The final vulvae volume was 820% larger (P<0.05) in gilts fed diets containing zearalenone than those fed control diet (941 x 8658mm 3 /kgBW 0.6 ). Results suggested that zearalenone and its metabolites have an estrogenic

Relação da ractopamina com componentes nutricionais e desempenho em suínos: um estudo meta-analítico

A meta-analysis was carried to evaluate the relationship of ractopamine with nutritional variables and performance in pigs. The database included 29 articles published in national and international journals from 1990 to 2007, totaling 155 treatments and 3,786 pigs. The average inclusion of ractopamine was 15.3ppm (ranged from 0 to 30ppm) and the daily average intake of ractopamine was 24.9mg (ranging from 0 to 84mg). Inclusion of ractopamine in diets showed (P 0.05) the feed intake, but increased (P<0.05) in 12% the feed efficiency, in 10% the weight gain and in 3.7% the final body weight. The concentrations of protein, lysine and energy in diets affected the animal response feeding with ractopamine. Increasing a unit in dietary lysine concentration resulted in increase of 341g in weight gain (ADG=0.687+0.341LIS, R²=0.71) and 1.3% in feeding efficiency (EF=2.14+1.34LIS; R²=0.62). Ractopamine improves pig performance, however, the interaction between additive and nutritional components must be considered in diets formulation.

Digestibilidade aparente de dietas e metabolismo de frangos de corte alimentados com dietas contendo soja integral processada

Foi realizado um experimento para avaliar a digestibilidade aparente de dietas e o metabolismo de frangos de corte alimentados com dietas contendo soja integral (SI) processada a vacuo (SIvac) ou a vapor (SIvap). O delineamento experimental foi inteiramente casualizado, com cinco tratamentos (dieta controle - DC; DC com substituicao isometrica de 40% de SIvac ou SIvap; dieta com SIvac e dieta com SIvap). Os tratamentos com substituicao isometrica avaliaram a digestibilidade das sojas processadas; os demais, a digestibilidade de dietas contendo ou nao soja processada (controle). A ingestao de N foi 23 e 20% menor (P 0,05) pelas dietas. A excrecao de energia foi 19 e 22% menor (P 0,05) para a soja integral processada a vacuo ou a vapor. A soja processada a vacuo ou a vapor e uma alternativa ao farelo de soja e ao oleo vegetal em dietas para frangos de corte.

Características de carcaça e da carne de suínos machos castrados e imunocastrados alimentados com diferentes níveis nutricionais

The study was carried out to evaluate the carcass characteristics and meat of surgically castrated and immunocastrated pigs fed with different nutritional levels. The animals were distribuited in a completely randomized experimental design with four main treatments (T1-surgically castrated pigs fed with basal diet; T2-immunocastrated pigs fed with basal diet; T3-immunocastrated pigs fed with basal diet+3% amino acids and energy; T4-immunocastrated pigs fed with basal diet+5% amino acids and energy) and two secondary treatments with or without ractopamine within each main treatment. The surgically castrated pigs had slaughter weight 3.3% lower (P<0.05), cold carcass weight 1.4% higher (P<0.05) and loin chop weight 13% higher (P<0.05) compared to immunocastred pigs. The immunocastrated pigs supplemented with 5% more amino acids and energy had rib 19% more heavier (P<0.05) and higher values (P<0.05) in the color b* (yellow-blue) in the meat to 45min and 24h post-slaughter compared with surgically castrated pigs fed with basal diet. Supplementation with 5% amino acids and energy increases weight and yield of rib and changes the value of color b* (yellow-blue) in the meat to 45min and 24h post-slaughter male pigs immunocastrated.