Perfil metabólico de vacas mestiças leiteiras com baixo escore de condição corporal no periparto

Abstract

Pesq. Vet. Bras. 34(4):362-368, abril 2014 362 RESUMO.-Objetivou-se avaliar o perfil metabólico energé-tico, proteico e enzimático de vacas mestiças leiteiras com baixo escore de condição corporal (ECC) no periparto. Foram colhidas amostras sanguíneas uma semana antes do parto, no dia do parto, e aos sete, 14, 21, 28 e 43 dias pós--parto (DPP) de 36 animais, com média de ECC de 2,6±0,5, com eutocia e pós-parto fisiológico e sem tratamentos nesta fase. Analisaram-se as concentrações séricas de proteínas totais, albumina e globulinas para o perfil protéico; AST, ALT, GGT e fosfatase alcalina para o perfil enzimático; ácidos graxos não-esterificados (NEFA), b-hidroxibutirato (BHBA), triglicerídeos, colesterol e lipoproteínas (VLDL, HDL e LDL) para o perfil energético. As vacas apresentaram no pré-parto hipoproteinemia, hipoalbuminemia, hipocolesterolemia e aumento das enzimas GGT e AST. No dia do parto houve lipólise e hipoglobulinemia. Concluiu-se que vacas mestiças leiteiras com baixo ECC apresentam balanço energético negativo, hipoproteinemia com hipoalbuminemia e lesão hepática no periparto, com restabelecimento aos 30 DPP, mas não recuperam sua condição corporal até o final do puerpério. The aim of this study was to evaluate the metabolic profile of protein, energy and enzyme in crossbred dairy cows with low body condition score (BCS) in the peripartum period. Blood samples were collected from 36 animals with 2.6±0.5 BCS, eutocia, physiological postpartum and without any treatment, on following days: one week before calving, calving and 7, 14, 21, 28 and 43 days in milk (DIM). It was evaluated serum total protein, albumin and globulins for protein profile; AST, ALT, GGT and alkaline phosphatase for mineral profile; nonesterified fatty acids (NEFA), b-hydroxybutyrate (BHBA), triglycerides, cholesterol and lipoproteins (VLDL, HDL and LDL) for energy profile. Crossbred dairy cows had hypoproteinemia, hypoalbuminemia, hypocholesterolemia and increased that both enzymes AST and GGT at the precalving. There were lipolysis and hypoglobulinemia at parturition. It was concluded that crossbred dairy cows with low BCS have negative energy balance, hypoproteinemia with hypoalbuminemia and hepatic injury in the peripartum. This condition is restored at 30 DIM, but there is no recovery of the body condition by the end of puerperium.INDEX TERMS: Dairy cattle, biochemistry profile, metabolic profile, postpartum, calving, eutocia.

Protein, energetic, enzymatic and mineral profile of Nellore cows during the pregnancy, parturition and postpartum

“…The reduction in serum glucose concentrations in the immediate pre-partum may be related to the progress of gestational development, since at the end of gestation, the energetic requirements are increased, caused by the exponential growth of the foetus up to 80% of its size and final weight (Rodrigues, Rodrigues, Branco, Queiroz, & Araújo, 2006) and by the needs for the development of the udder as well as for the synthesis of lactose. The results found in the present study for glucose during pregnancy disagree with Oliveira et al (2014) who found increasing values of glucose until the parturition and corroborating with the findings by Janovick et al (2011) who found higher concentrations of glucose at parturition. The elevation that occurs for glycemia is most likely due to the release of endogenous glucocorticoids in response to the stress caused by the moment of parturition, since cortisol is a stimulator of the gluconeogenic pathway, making glucose more bioavailable.…”

“…Ammonia in excess synthesized in the rumen goes into the bloodstream, being carried to the liver and bio transformed in urea, can be used as a source of nitrogen or remain circulating in the blood or be excreted in the urine (Oliveira et al, 2014). Urea is a component synthesized in the liver in amounts proportional to the ammonia concentration produced rumen and its concentration is directly related to the protein levels of the diet and to the relation between energy and protein of the diet.…”

“…The stage of higher concentration of aspartate aminotransferase was during the late pregnancy, probably influenced by the great mobilization of nutrients to the foetus, since at that stage the foetal growth is accentuated (Gravena et al, 2010). Another possible explanation would be the intense muscular effort that occurs at parturition causing lysis of muscle fibers and increasing serum concentrations in the early phase of the puerperium, but because the half-life of this enzyme to be short, was accelerated, justifying the low concentration in the periods of one day postpartum and in the 30 days postpartum (Fagliari et al, 1998;Souza, Collona, Garcia, Birgel, & Birgel Junior, 2008;Oliveira et al, 2014).…”

Efeito da suplementação de colina protegida no perfil metabólico e intervalo entre parto e concepção de vacas leiteiras

“…No estudo de González et al (2010), a produção de leite foi de 41,1 litros, enquanto a produção média das vacas dos três grupos experimentais foi muito inferior (27,4 litros), o que resulta em grande diferença na demanda de energia e na atividade metabólica hepática. No presente estudo, houve uma redução gradativa nos teores de AST em todos os grupos, assim como observado por Oliveira et al (2014), com diferença estatística entre os dias 10 e 30 no grupo experimental T10 (P=0,002) (Tab. 1).…”

Pós Parto De Vacas Leiteiras Oriundas De Rebanhos Da Agricultura Familiar Do Município De Realeza – Paraná

“…O ECC dos animais aos 60 dias pós-parto também não interferiu com a presença de corpo lúteo, sendo que 63,1% (65/103) deles estavam magros. Nesse período somente 21,4% (22/103) dos animais apresentaram corpo lúteo ovariano que poderia ser explicado pela perda de condição corporal neste período (SARTORI, 2007, BITTAR et al, 2014, CAMPOS et al, 2012, OLIVEIRA et al, 2014.…”