concentração plasmática de cortisol, uréia, cálcio e fósforo em vacas de corte mantidas a pasto suplementadas com levedura de cromo durante a estação de monta cortisol, urea, calcium and phosphorus plasma concentration in grazing beef cows supplemented with high chromium yeast during breeding season

Clicks: 362
ID: 141958
2003
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Abstract
Foi pesquisada a influência da suplementação com cromo (Cr) sobre a concentração plasmática de cortisol, uréia, cálcio e fósforo em vacas zebu mantidas a pasto e numa situação de estresse calórico durante a estação de monta. Foram utilizadas trinta vacas primíparas com peso entre 380 e 385kg. Os animais foram divididos em grupos de 15 vacas, formando o tratamento suplementado com Cr e o tratamento não suplementado (controle). As vacas pastorearam em piquetes formados por Brachiaria brizanta cv. Marandu. A fonte de Cr foi levedura enriquecida (1g Cr kg-1 de produto comercial) e foi adicionado à mistura mineral aportando 0,017% de Cr. Amostras de sangue foram tomadas em três períodos através de venipunção jugular e coletadas em tubos contendo heparina. As amostras de plasma foram analisadas para fósforo, cálcio, uréia e cortisol. Os dados foram analisados como um desenho de blocos ao acaso. O consumo médio diário de mistura mineral foi de 72,92g no grupo suplementado com Cr (12,40mg Cr/cabeça/dia) e 77,84g no grupo controle (0,78mg Cr/cabeça/dia). A concentração plasmática de cortisol, no grupo suplementado com Cr, foi menor que no tratamento controle (2,11mg dl-1 vs. 3,29mg dl-1). As concentrações plasmáticas de fósforo (6,36mg dl-1 vs 3,56mg dl-1) e de cálcio (12,87mg dl-1 vs 9,02mg dl-1) foram maiores no grupo suplementado com Cr durante o primeiro período, mas não existiram diferenças no segundo e terceiro períodos de colheita. Os níveis plasmáticos de uréia (17,13mg dl-1 vs. 17,70mg dl-1) não foram diferentes entre os grupos experimentais.
The influence of supplemental chromium (Cr) on plasma cortisol, urea, calcium and phosphorus concentration were investigated in grazing cattle in caloric stress situation during the breeding season. Thirty primiparous zebu cows with 380 to 385kg of body weight were assigned to the following treatments: 15 cows fed supplemental Cr and 15 cows without supplemental Cr (Control). The cows were grazing in Brachiaria brizantha pasture. Chromium was supplied as high-Cr yeast Sacharomices cerevisae (1gCr kg-1). Chromium was added to mineral premix to provide 0.017% of supplemental Cr. Blood samples were collected in three periods by jugular venipuncture in heparinized tubes. Plasma was analysed for phosphorus, calcium, urea and cortisol. Data were analysed as a randomised block design. Premix daily consumption was 72.92g in the supplemented cow (12.40mg Cr/animal/day) and 77.84g premix in the non supplemented cow (0.78mg Cr/animal/day) groups. The concentration of cortisol in Cr-supplemented group was lower than that in control treatment (2.11mg dl-1 vs. 3.29mg dl-1). Plasma phosphorus (6.36mg dl-1 vs. 3.56mg dl-1) and calcium (12.87mg dl-1 vs. 9.02mg dl-1) were higher in Cr-supplemented group in the first period but no differences were found between groups in other periods. There was no difference in urea level (17.13mg dl-1 vs 17.70mg dl-1) between supplemented and control group.
Reference Key
vsquez2003cinciaconcentrao Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Eduardo Fabian Aragón Vásquez;Alexandra del Pilar Naranjo Herrera
Journal Trials
Year 2003
DOI
10.1590/S0103-84782003000400025
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782003000400025
Keywords
Urea chromium cortisol phosphorus calcium

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