Clinical evaluation of unadapted sheep submited to sudden intake of melon with high levels of sugar

Abstract

This study evaluated the clinical effects of two different amounts of melon, with a high sugar content, suddenly offered to unadapted sheep. Twelve rumem cannulated crossbred 8-months-old sheep , weighing 25 kg each, were used. These sheep had never been fed with food concentrated with sugar or fruits. The animals were kept in collective pens with a basal diet of roughage and then randomly divided into two equal groups. The sheep in the two groups received 25% and 75% of dry matter (DM) of the diet the crushed melon, administered by the rumen cannula. Physical examination and measurement of rumen fluid pH was performed at the following times: 0, 3, 6, 12, 18 and 24 h. The animals of G25% did not present clinical signs despite subacute acidosis expected after administration of the melon. However, in the G75%, sheep developed clinical manifestation indicative of lactic acidosis with rumen fluid pH lower than 5.0 from T6h, but did not present with dehydration. In sheep from G75 %, tachycardia was observed at 3 h and continued until the end of the study; tachypnea was also observed at 3 h, which was caused by increased abdominal circumference. Based on the results obtained, the supplementation of high amounts of melon (75% DM) in the diet is not recommended for sheep, although the use of 25% DM is safe. However, greater amounts of this fruit could be used in the diet of sheep with gradual adaptation to the substrate. utilizados 12 ovinos canulados, mestiços da raça Santa Inês, machos, pesando 25 kg, com oito meses de idade e que nunca haviam recebido rações concentradas, frutas ou raízes. Os animais foram mantidos em baias coletivas com dieta basal composta de volumoso e distribuídos aleatoriamente em dois grupos iguais que receberam, subitamente, quantidades de melão triturado correspondentes a 25 e 75% da matéria seca (MS) da dieta, administradas pela cânula ruminal. Foi realizado exame físico e mensuração do pH do fluido ruminal nos seguintes momentos: zero, 3, 6, 12, 18 e 24 h. Os animais do G25% não manifestaram sintomatologia clínica, apesar da acidose subaguda esperada após a administração de melão. Os animais do G75% desenvolveram quadro clínico indicativo de acidose láctica ruminal, com pH deste fluido inferior a 5,0 a partir do T6h, mas sem apresentar desidratação. Nos ovinos do G75% foi observada taquicardia a partir do momento 3 horas até o final do estudo e discreta taquipnéia no momento 3 horas, causadas pelo aumento da circunferência abdominal. Não se recomenda o oferecimento de altas quantidades de melão (75% da M.S.), porém a quantidade correspondente a 25% da M.S. é segura. Maiores concentrações dessa fruta na dieta podem ser utilizadas desde que se tomem cuidados para a adaptação gradual dos animais ao substrato.

Effects of sudden melon intake on ruminal parameters of non-adapted sheep

“…This accumulation of acids creates a condition that can involve anorexia, dehydration, diarrhea, general depression, tachycardia, an enlarged left ventral flank, metabolic acidosis, and other disorders (Dunlop 1972, Ortolani et al 1980, Owens et al 1998. Radostits et al 2007, Oliveira et al 2015b.…”

Avaliação clínica de ovinos após a ingestão de elevada quantidade de manga

“…2. A frequência respiratória, durante todo o período experimental, para ambos os tratamentos, encontrou-se no patamar considerado como aumentado no trabalho de Oliveira et al (2015b), o que pode ser explicado pelo fato de os animais deste experimento estarem em um ambiente com temperatura elevada, o que naturalmente resulta em taquipneia (Andrade et al, 2007). A dissipação do calor por evaporação por meio da respiração é um dos mecanismos mais importantes para dissipar calor para raças adaptadas ao estresse térmico (Medeiros et al, 2008).…”

Subacute Ruminal Acidosis in Zebu Cattle: Clinical and Behavioral Aspects

“…Low pH levels, especially less than 5.5, provoked an increase in the ruminal lactate levels and in osmotic pressure as well as a reduction in the frequency and amplitude of ruminal contractions. This condition, combined with the inflammation of the ruminal epithelium, may have been the cause of the decreased appetite [ 3 , 12 , 29 ]. The first important result of this study was that the degree of hyporexia on the first day determined the appetite on the second day of SARA, a fact not previously described.…”

“…The animals were evaluated for a total period of five consecutive days: day zero (D0), which was the SARA induction day, and 4 days of behavioral evaluations, which comprised 1 day before (D-1) and 3 days after the induction (D1, D2, and D3) (Figure 1). On D0, the physical examination of the animals as well as rumen content, feces, urine, and blood sample collections were performed at the following time points: T0 (baseline moment before induction), T3, T6, T9, T12, T15, T18, and T24 (3,6,9,12,15,18, and 24 h after induction, respectively). Meanwhile, during the physical examination, the following variables were measured: heart rate (HR), respiratory rate (RR), rectal temperature (T), and ruminal movement [17].…”

“…These production goals require increased use of high energy diets, which are rich in concentrates and favor productive efficiency. However, at the same time, such diets increase the frequency of the occurrence of digestive diseases, especially ruminal acidosis [ 1 , 2 , 3 ].…”