Perfil metabólico de búfalas lactantes criadas a pasto submetidas à administração de somatotropina recombinante bovina.

Abstract

The objective of this study was to evaluate the metabolic profile of lactating buffaloes raised on pasture submitted to administration of recombinant bovine somatotropin. The experiment was conducted in a farm located in the Northeast mesoregion of Pará where 22 adult buffaloes, clinically healthy, with normal parturition with the same lactation order, subject to the same system of grazing and nutrient management accompanied from the 63 day to the 154 day of lactation. The experimental design was completely randomized and after selection, the animais were divided into two groups with equal body weights, body score condition and milk production. The first group consisted of 11 buffaloes, which received the application of 500 mg of recombinant bovine somatotrotopin every 14 days by subcutaneous injection in the ischiorectal fossa, alternating the left and right sides in each application, amounting seven injections. The second group (control) consisted of 11 animais that received no treatment. During the experiment, blood samples were taken for determining the biochemical profile (glucose , cholesterol , triglycerides , total protein , albumin , urea , creatinine , calcium, phosphorus and magnesium ), grouped according to the lactation period ; 63 -1 70 , 70 -1 77; 77 -1 84 ; 84 -1 91; 91 -1 98; 98 -1 105 , 105 - I 112 , 112 - I 119 , 119 - I 126 , 133 - I 140 , 147 - I 154 days of lactation , totaling 11 samplings in ali. Descriptive statistics of the data was represented by the arithmetic averages and standard error of the mean (SEM) for each treatment errors was obtained by procedimentoMeans SAS version 9.2. The comparison between the means of the groups within each time (trat/time) was performed using the media Tukey test through LSMEANS command (Least Square Means) of SAS with a significance levei of 5 % was used for ali tests. The mean of the parameters in accordance with the experimental group (treatment and control) were; glucose (70.58 and 64.81 mg/dl), total protein (8.57 and 8.75 mg/dL), albumin (3.47 and 3.60 mg/dL), urea ( 32.46 and 33.86 mg/dL) , creatinine (1.27 and 1.39 mg/dl ) , calcium (10.25 and 10.73 mg/dl) , phosphorus (5.76 and 5.62 mg/dL), magnesium (3.70 and 3.70 mg/dl ) , triglycerides (29.18 and 28.32 mg/dL) and cholesterol (132.38 and 133.40 mg/dL), respectively. The administration of recombinant bovine somatotropin (rbST) did not affect the plasma leveis of glucose, triglycerides and cholesterol as well as blood metabolite concentration of protein (total protein, urea, creatinine and albumin) nor the leveis of serum minerais ( calcium, phosphorus and magnesium) in buffaloes studied.