Dispositivo fotobiomodulador para prevenção e tratamento de hiperqueratose de teto em vacas leiteiras

Abstract

The mastitis consists one of the main problems of milk production, mainly due to the production losses and the rising cost of milk. The benefits of phototherapy have been observed in certain conditions, including in treatment of lesions in some animals. The teat canal is the first and major anatomical defense of the udder. Once the bacteria pass the teat canal, they approach the immune cells. In case of severe hyperkeratosis, the teat canal can become an easier barrier for the bacteria to penetrate. Changes in cell membrane permeability, increased cellular metabolism, DNA and RNA synthesis, fibroblast proliferation, activation of defense cells, and improvement of circulation are the most important physiological effects of phototherapy. The objective of this study was to assess a device of phototherapy with LED for treatment and prevention of teat hyperkeratosis in herd milk. Besides, it was found the incidence of clinical and subclinical mastitis. Experiment 1 Evaluation of the effect of exposure time to the action of milking in the onset and progression of teat hyperkeratosis. Experiment 2 Evaluation of the conceivable preventive effect of phototherapy on the development of teat hyperkeratosis with 60 cows in early lactation. Experiment 3 - Evaluation of the possible therapeutic effect of phototherapy on the cicatrization of teat hyperkeratotic with 30 cows of second parity. In the Experiments 2 and 3, half of the animals were treated with the phototheray device three times per week for 6 weeks. Scanned images were performed at baseline and weekly for 6 consecutive weeks; in the experiment 1, it was performed more images between 6 and 7 months of fist lactation. CCS was performed monthly. In the experiment 1, hyperkeratosis was high, 35.3% of severe cases. In experiment 2, the outer diameter of the lesions remained constant in the teats of the treated group; the control group showed a significant increase at the end of lactation. For cases of subclinical mastitis, it was observed improvement of milk quality and decreasing of subclinical mastitis. It can be concluded that there was efficiency to prevent the increase of hyperkeratosis. In the experiment 3, the use of LED reduced the incidence of subclinical mastitis. The prototype is promising as an adjunct in preventing the development of teat hyperkeratosis, and also as a way to reduce subclinical mastitis in dairy cows of high production