Perfil oxidativo e leucometria de ovelhas de corte acometidas por mastite crônica

O objetivo deste estudo foi avaliar o perfil oxidativo e o leucometria de ovelhas de corte com mastite crônica, para isso foi utilizado 30 animais em lactação os quais foram divididos em dois grupos de 15 animais: grupo positivo - animais que exibiram sinais clínicos de mastite e grupo negativo - ovelhas sem sinais de alteração na glândula mamária e/ou no leite. Para realização do California Mastitis Test (CMT) e exame microbiológico foram coletadas amostras de leite e para determinar o total de leucócitos, o índice de estresse oxidativo (OSI) e o óxido nítrico foram coletadas amostras de sangue. Sessenta por cento das ovelhas com mastite apresentaram CMT positivo. Não houve diferença entre os grupos nos valores de leucócitos, de OSI e no oxido nítrico. Em decorrência da redução do processo inflamatório, ovelhas com mastite crônica não apresentam alterações no perfil oxidativo e no total de leucócitos.

Metabolism, intake, and digestibility of lambs supplemented with organic chromium.

The aim of the present study was to evaluate the metabolism of organic chromium and its effect on digestibility and intake of lambs. Four 4-month-old male lambs, each weighing 28 kg, were used. The animals were kept in metabolic cages for a period of 20 days (15 days of adaptation and 5 days of experimentation), in two experimental phases, with inverted treatments. Organic chromium was administered by intraruminal infusion of 1 mg of chromium-rich yeast (Saccharomyces cerevisiae) throughout the adaptive and experimental period. The dry material rates of the diet and feces of the animals were evaluated to estimate consumption, digestibility, and fecal production. During the experimental period, blood, feces, and urine were collected every 24 h to determine chromium levels. There was no significant difference in the excretion of chromium in the urine, and no mineral remnants were detected in the blood. Excretion was generally fecal. There was greater excretion of chromium in the feces of lambs in the treated group on day 0 and day 3, compared with the control group. The use of organic chromium promoted an increase in the consumption of dry material in the treated animals only at day 0 (P <0.05). The production of fecal dry matter was greater among the treated lambs than among the animals of the control group on day 1, day 2, day 3, and day 4 (P <0.05). The results obtained showed that organic chromium associated with live yeasts is not absorbed by the body and do not affect the intake time in the dose used.