RESUMO
The aim of this study was to evaluate the variations of Acute Phase Proteins (APPs) and other blood constituents during the onset of the sub-acute ruminal acidosis (SARA) pathological status. A total of 108 cows from 12 dairy herds were randomly selected and divided into three Groups of 36 animals each. All animals were subjected to a rumenocentesis. Group A was composed by subjects with a rumen pH>5.8, Group B was composed by subjects with a rumen pH ≤5.5≤5.8 and Group C was composed by subjects with a rumen pH<5.5. Blood samples were collected by jugular venipuncture and Haptoglobin (Hp), Serum Amyloid A (SAA), Total Proteins, Albumin and White Blood Cells (WBC) were determined. One-way ANOVA showed a statistical significance on Rumen pH, Hp, SAA. SARA seems not stimulate the APPs production from liver.
O objetivo deste estudo foi avaliar as variações de Proteínas de Fase Aguda (APPs) e outros constituintes sanguíneos durante o início do status patológico de sub-acute ruminal acidosis (SARA). O total de 108 vacas de 12 rebanhos leiteiros foram aleatoriamente selecionados e divididos em três grupos com 36 animais cada. Todos os animais foram submetidos a ruminocentesis. O Grupo A foi composto por sujeitos com rumen pH>5.8, o Grupo B foi composto por sujeitos com rumen pH ≤5.5≤5.8 e o Grupo C foi composto por sujeitos com rumen pH<5.5. Amostras sanguíneas foram coletas por punção venosa jugular e Haptoglobin (Hp), Serum Amyloid A (SAA), Proteínas totais, Albumin e células brancas do sangue (WBC) foram determinadas. ANOVA em via única mostrou significância estatística em Rumen pH, Hp, SAA. SARA não parece estimular a produção de APPs pelo fígado.
RESUMO
The authors conducted an electrocardiographic investigation on eight jumpers of Sella Italiana breed to evaluate cardiovascular changes associated with specific competitions. Electrocardiographic recordings were carried out using an electrocardiograph with a deflection of 10 mm/mV and a paper speed of 25 mm/sec. Recordings were conducted under the following experimental conditions: at rest, after warm up, after a jumping trial, and 15 and 30 minutes after the end of the trial. Significant reductions were observed in the duration of the P wave, of the P-Q interval, and of the R-R intervals immediately after the test. Significant elevations were observed immediately after the test in the range of the T and P waves of the heart rate. The observed changes can be attributed mainly to increase of the sympathetic tone connected with increase of heart rate necessary to satisfy the elevation of the cardiac range. These results are useful to plan and monitor specific training programmes.