%0 Journal Article
%T PROTEIN AND MINERAL METABOLITES FOR DAIRY COWS DURING THE TRANSITION PERIOD UNDER TROPICAL CONDITIONS METABOLITOS PROTEICOS Y MINERALES EN VACAS LECHERAS EN PER赤ODO DE TRANSICI車N BAJO CONDICIONES TROPICALES
%A R車mulo Campos Gaona
%A Katherine Garc赤a Alegr赤a
%A Erika Andrea Hern芍ndez
%A Le車nidas Giraldo Patiˋo
%J Revista Facultad Nacional de Agronom赤a, Medell赤n
%D 2012
%I Universidad Nacional de Colombia, Sede Medell赤n
%X . In bovines, the transition period goes from the last three prepartum weeks to the first three postpartum weeks. This period is characterized by the metabolic adaptation of lipids, carbohydrates, minerals and proteins that try to balance the low intake of dry matter and the beginning of the secretion of milk. These changes are regulated by corticosteroids that are released at the time of birth. Some metabolites show noticeable changes in their blood concentration during this stage, which can lead to sanitary, reproductive and productive problems. The objective of the present work was to analyse the homeostasis in the transitional period, by determining the concentration of protein indicators, and some macrominerals, in dairy cows from two breeds under low-tropic conditions. The work was carried out in two commercial farms with similar management conditions in the Colombian south eastern region, in a agro-ecological zone of tropical dry forest according to Holdridge (1987), situated at 1,050 masl, with an average temperature of 23 oC and an annual rainfall of 1200 mm bimodally distributed. The feed consisted of Bermuda grass (Cynodon nlemfuensis). The present work used seven Holstein cows and seven Hart車n del Valle cows, from which blood samples were taken by coccygeal venepuncture in vacuum tubes, with heparin as anticoagulant and without anticoagulant, during the transition period, and up to the 60th day after delivery. A total of 156 samples were analysed. The following values were determined: total protein, albumin, globulin and urea; macro-minerals such as Ca, P and Mg and the cortisol hormone. The average values found for the Holstein breed were: total protein 66.7 g L-1, albumin 37.6 g L-1, globulins 27.7 g L-1, urea 6.11 mmol L-1, Ca 2.21 mmol L-1, P 1.87 mmol L-1, Mg 1.03 mmol L-1 and cortisol 33.2 nmol L-1. For the Hart車n del Valle breed the following average values were found: total protein 57.7 g L-1, albumin 35.6 g L-1, globulins 20.3 g L-1, urea 5.37 mmol L-1, Ca 2.56 mmol L-1, P 1.81 mmol L-1, Mg 0.81 mmol L-1 and cortisol 34.1 nmol L-1. The only significant differences between the Hart車n del Valle and the Holstein breeds were total protein, globulin and the serum cortisol levels. Resumen. En bovinos, el per赤odo de transici車n comprende las tres 迆ltimas semanas preparto y las primeras tres posparto. Es caracterizado por adaptaciones en el metabolismo de l赤pidos, carbohidratos, minerales y prote赤nas buscando compensar el bajo consumo de materia seca y el inicio de la secreci車n l芍ctea; estos cambios son regulados por corticosteroides liberado
%K Prote赤nas
%K Holstein
%K Hart車n
%K homeostasis
%K indicadores proteicos
%K Proteins
%K Holstein
%K Hart車n
%K homeostasis
%K protein indicators
%U http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0304-28472012000200016