Efeito metafilático do zinco injetável sobre parâmetros metabólicos e oxidativos de ovelhas no pós-parto imediato / Metaphylactic effect of injectable zinc on metabolic and oxidative parameters of sheep in the immediate postpartum

The aim of this study was to evaluate a new source of injectable organic zinc (zinc edetate) on the energy and oxidative profile in sheep during the immediate postpartum period. Twenty-six Texel breed animals were previously identified and divided into two experimental groups: the treated group (TG; n= 13) that comprised the animals that received a subcutaneous (SC) injection of 100 mg of zinc edetate (2 mL) fifteen days before the parturition expected date and the control group (CG; n=13) that comprised the animals that received 2mL of physiological solution at the same date of TG. Blood samples were collected on the parturition day for the assessment of serum fructosamine, cholesterol and triglycerides, insulin-like growth factor type 1 (IGF-1), the oxidative stress index (OSi) and blood zinc concentration. In addition to these parameters, the measurement of zinc was made in food given to the animals. There was no difference in metabolic parameters and OSi between the experimental groups (P>0.05), as well as in blood zinc concentrations (P>0.05). The parenteral zinc edentate does not change the energy and oxidative profile of sheep in immediate postpartum.(AU)

Perfil oxidativo e leucometria de ovelhas de corte acometidas por mastite crônica / White cell count and oxidative profile in sheep affected by chronic mastitis

O objetivo deste estudo foi avaliar o perfil oxidativo e o leucometria de ovelhas de corte com mastite crônica. Para isso foram utilizados 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 óxido nítrico. Em decorrência da redução do processo inflamatório, ovelhas com mastite crônica não apresentam alterações no perfil oxidativo e no total de leucócitos.

In this study 30 lactating sheep were used to evaluate the oxidative profile and leucocytes of animals with chronic mastitis. Groups, containing 15 animals each, were divided into: group of positive animals presenting clinical signs of mastitis, and control group containing animals which did not present alterations in the mammal gland or in the milk. Milk samples were collected and the California Mastitis Test (CMT) and microbiologic examination were performed. In addition, the total of leukocytes, total antioxidant capacity (TAC), total oxidant status (TOS) and nitric oxide were measured through blood analyses. Sixty percent of the animals with mastitis presented CMT positive. There was no difference in the values of leukocytes, OSI and nitric oxide between groups. Sheep with chronic mastitis did not present alterations in the oxidative profile and total leukocytes, due to the reduction of the inflammation