Paulo Eduardo Pardo

Etiologia das infecções intramamárias em vacas primíparas no período pós-parto

A total of 664 foremilk samples from 83 Holstein cows were cultured. Quarter samples were collected at parturition and 7 days post the first parturition. From 664 milk samples examined, 488 (73.50%) were bacteriologically negative and 176 (26.50%) were positive. A high incidence (20.48%) of clinical mastitis was observed. The most frequently encountered isolates were coagulase negative staphylococci (64.20%), coagulase positive staphylococci (8.52%), streptococci (7.96%), Actinomyces pyogenes (4.55%), Mycoplasma bovigenitalium (3.40%) and Escherichia coli (2.84%). The frequency of mastitis pathogen isolation was highest at parturition (17.62%) and decreased markedly during the first week (8.88%).

EFFECT OF MATRICARIA CHAMOMILLA CH12 WEANING STRESS IN PIGS

Weaning is a phase of life that creates stress in pigs causing damage to the welfare and health of pigs. The Matricaria chamomilla CH12 reduced stress management in cattle, but has not been tested in pigs. Study evaluated the effect of Matricaria chamomilla CH12 in the stress of weaning. We used 16 male pigs Landrace animals with 28 days of age, randomly divided into two groups (8 animals/group), the control group (GC) received concentrate feed without and other group (GMc) received concentrate feed containing addition Matricaria chamomilla CH12. Blood samples were collected from pigs on days 1, 14, 24 and 30 after weaning for determination of serum cortisol radioimmunoassay. Piglets were stressed out the next day weaning with a significant increase (P <0.05) in serum cortisol concentration above the baseline. But piglets adapted to it, 30 days after weaning, the serum cortisol showed a significant linear decrease (R 2 =0,88; P<0.01) returning the basal concentration. However, piglets GMc the group at any time after weaning showed up stressed and serum cortisol was 61.8 in group GMc %, 43.5%, 77.2% and 32.0% lower than the GC on days 1, 14, 24 and 30 after weaning, even so, the serum cortisol did not differ significantly between (P>0,05) groups. But these results show the physiological effect of chamomilla. Matricaria chamomilla CH12 can be used for the decrease of the stress of weaning pigs and the weaning acts as stressor agent, but the animals adapt.

Suplementação com levedura de crômio eleva a concentração sérica de crômio em bovinos

EnglishThis study evaluated the effect of daily chromium supplementation at growing doses on serum Cr levels in cattle. Sixty Nellore heifers 2 to 5 years old were randomly assigned to one of four groups (15 heifers/group) fed non-fertilized Brachiaria decumbens pasture. In the control group (Gc), the heifers received a mineral mixture without Cr. In the other groups, heifers received 0.59, 1.19 or 2.38 mg Cr +3 /animal/day, groups G 8.5 , G 17 and G 34 , respectively. Blood samples were collected on days 0, 30 and 60. Serum concentration of chromium was determined by graphite furnace atomic absorption spectrophotometer. The chromium source used was the chromium yeast. The results do not support any significant difference (p>0.05) among serum chromium levels of heifers in groups Gc, G 8.5 , G 17 and G 34 at a same observation day. Only effect of supplementation time was detected in group G 34 . In this group there was significant increase (p portuguesO estudo avaliou o efeito da suplementacao com doses crescentes de cromio/dia sobre a concentracao serica de Cr em bovinos. Sessenta novilhas da raca Nelore com idade entre 2 e 5 anos foram distribuidas aleatoriamente em 4 grupos (15 novilhas/grupo) alimentadas com pastagem de Brachiaria decumbens nao fertilizada. No grupo controle (Gc), as novilhas receberam mistura mineral sem adicao de Cr. Nos demais as novilhas receberam 0,59; 1,19 e 2,38 mg de Cr +3 /animal/dia (grupos G 8,5 , G 17 e G 34 , respectivamente). Colheram- se amostras de sangue nos dias 0, 30 e 60. A concentracao serica de cromio foi determinada por meio de espectrofotometria de absorcao atomica com forno de grafite. A fonte de cromio utilizada foi a levedura de cromio. Os resultados mostram que nao houve diferenca significativa (p>0,05) na concentracao serica de cromio das novilhas entre os grupos Gc; G 8,5 ; G 17 e G 34 , num mesmo dia de observacao. O unico efeito obser- vado foi do tempo de suplementacao com cromio no o grupo G 34 . Neste grupo a concentracao serica de cromio apresentou aumento significativo (p Conclui-se a levedura de Cr pode ser utilizada como fonte deste elemento mineral para os bovi- nos e a suplementacao com 2,38 mg/bovino/dia foi a dose que mais elevou a concentracao serica de Cr nos bovinos da raca Nelore durante o periodo experimental.