Perfil bioquímico de algumas enzimas no plasma sangüíneo de potras da raça Brasileiro de Hipismo (BH) criadas em Colina, Estado de São Paulo / Biochemical profile of some plasmatic enzymes in BH (Brasileiro de Hipismo) filies bred Colina in São Paulo State

Com o propósito de avaliar o perfil bioquímico de algumas enzimas,em potras sadias da raça BH (Brasileiro de Hipismo), utilizaram-se380 amostras de plasma sangüíneo colhidas de 19 animais desde o nascimento até 24 meses de vida. Na análise dos resultados evidenciou-se que os valores médios das enzimas FA (fosfatase alcalina) e CK( creatina quinase) foram máximos entre o nascimento e 24 horas devida (FA-1995.50 UI/ ; CK-189.13UI/L), enquanto que para a LD(lactato desidrogenase) e GGT (gama glutamiltransferase) as maiores magnitudes ocorreram, respectivamente, entre 3 e 4 dias (LD-479.11UI/L) e aos 10 dias de idade (GGT-18.70UI/L). As FA, CK,LD e GGT, mostraram diminuições dos valores médios,respectivamente, até 6 meses (FA-323.50UI/L), 20 dias (CK-51UI/L), 19 meses (LD-214.00UI/L) e 4 meses (GGT-11.40UI/L)estabilizando-se a seguir, com pequenas variações. A atividade da AST (aspartato aminotransferase) que foi mínima logo após o nascimento (AST- 43.38UI/L), aumentou até os sete dias de vida(AST-110.89UI/L), e a seguir diminuiu progressivamente, com pequenas oscilações, até o final do estudo. Todas as enzimas avaliadas sofreram variações influenciadas pelo fator etário, particularmente no período inicial de vida dos animais estudados.

380 plasma samples were used with the purpose of evaluate the biochemical profile of some enzymes in healthy BH (Brasileiro deHipismo) fillies. These samples were collected from 19 animals since birth until 24 months of age. The results showed that the mean values of ALP (alkaline phosphatase) and CK (creatine kinase) were higher between birth and 24 hours of life (FA-1995.50 UI/; CK-189.13UI/L), where as for LD (lactate dehidrogenase) and GGT (gama glutamiltransferase) the highest values were, respectively, between 3 and 4 days (LD-479.11UI/L) and with 10 days of life (GGT-18.70UI/L). AP, CK, LD and GGT showed a reduction of the mean values,respectively, until 6 months (FA-323.50UI/L), 20 days (CK-51UI/L), 19 months (LD-214.00 UI/L) and 4 months (GGT-11.40UI/L)stabilizing with some oscillations. The activity of AST (aspartate aminotransferase) was minimal after birth (AST- 43.38UI/L) increased until the seventh day of life (AST-110.89UI/L) and next it diminished progressively with little oscillations until the end of the study. Allenzymes evaluated were influenced by age, particularly in the initial period of life of the animals studied.

Determinações plasmáticas de glicose, colesterol e triglicérides em potras sadias, da raça Brasileiro de Hipismo / Plasma values of glucose, cholesterol and triglycerides of healthy Brasileiro de Hipismo fillies

Utilizaram-se 380 amostras de plasma sangüíneo coletadas de 22 potras Brasileiro de Hipismo, sadias, desde o nascimento até 24 meses de idade. Os valores médios de colesterol foram máximos entre o nascimento e 24 horas de vida, enquanto que para glicose e triglicérides, o maior valor ocorreu entre três e quatro dias de vida. Os valores médios de colesterol e triglicérides diminuíram progressivamente até os 13 meses de idade, quando se estabilizaram. Foi observada redução progressiva das concentrações de glicose até nove meses, estabilizando-se a seguir. Houve influência dos fatores etários sobre as variações de todas as determinações bioquímicas, particularmente no período inicial de vida dos animais estudados.

Plasma biochemical values were determined in 380 samples obtained from 22 clinically normal Brasileiro de Hipismo fillies from birth to 24 months old. Statistical analysis showed higher concentrations of cholesterol between 0-4 hours and 24 hours after birth, while glucose and triglycerides with 3-4 days of age. Glucose concentrations decreased until nine months old, then remained fairly constant. Cholesterol and triglycerides decreased gradually with advancing of age until 13 months and then stabilized. It was concluded that the plasma biochemical values were influenced by age, particularly in the newborn foals considered in the study.

Serum cortisol, lactate and creatinine concentrations in Thoroughbred fillies of different ages and states of training

Exercise can be defined as "normal stress" stimulating body functions. Some reports suggest lactate as a stimulator of cortisol levels, while creatinine varies according to the amount of muscle tissue. In the present study we investigated the relationship between creatinine, serum lactate concentration and cortisol levels in training horses. Twenty-three Thoroughbred fillies were used, divided into 3 groups according to age and training protocol: G1, 1-2 years of age (N=7) on pasture, G2, 2-3 years (N=9) starting to be mounted, and G3, 3-4 years (N=7) racing at the Jockey Club. Blood samples were collected weekly during a six-month period at about 1:00 p.m. while the animals were resting. Cortisol was quantified with a commercial kit (Coat-a Count®) and serum creatinine and lactate were evaluated with an autoanalyzer with commercial reagents. Data were evaluated using non-parametric statistical tests, with the level of significance set at P< 0.05. Cortisol concentrations were 149ª + 7, 126b + 6, and 101c + 5 nmol/l, lactate concentrations were 2.1ª + 0.1, 2.0ª + 0.1, and 1.75b + 0.1 mmol/l, and creatinine concentrations were 125ª + 2, 132ª + 2 145b + 3 mumol/l in G1, G2 and G3, respectively. Only G2 showed a low but significant positive correlation of cortisol with lactate and a negative correlation of cortisol with creatinine levels. It was possible to conclude that cortisol, lactate and creatinine varied during horse aging and physical conditioning. The decrease of cortisol concentration (G2) suggests that the better physical condition acquired during training led to the increase of creatinine concentration, possibly related to muscle mass. The lower cortisol and lactate concentrations observed in G3 animals may have been due to greater muscle mass inducing an increase in creatinine concentrations or changes in muscle fiber type during training