34
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found
      Is Open Access

      Hipocalcemia não puerperal em vacas leiteiras sob pastejo de aveia e azevém: estudo de fatores predisponentes Translated title: Non-parturient hypocalcaemia in lactating dairy cows grazing in oat and perennial ryegrass pasture: study of predisposing factors

      research-article

      Read this article at

      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          A Hipocalcemia Não Puerperal (HNP) é uma condição rara e pouco compreendida. Não há estudos que expliquem a sua relação com a ingestão de pastagens de inverno como base da alimentação volumosa. Os objetivos deste trabalho foram descrever aspectos clínicos de dois casos naturais de HNP, e estudar o balanço mineral e eletrolítico de vacas leiteiras de alta e de média produção alimentadas em pastagem de inverno em diferentes estágios de evolução. Foram acompanhados dois casos de HNP em vacas leiteiras, mantidas em pastagens de aveia ou de azevém no município de Francisco Beltrão, PR. De três propriedades localizadas no mesmo município, foram selecionadas vacas lactantes hígidas de alta produção da raça Holandesa (n=11) e de média produção das raças Holandesa (n=8) e Jersey (n=9), mantidas em pastagem mista de aveia e azevém, de junho a outubro de 2011, e complementadas com silagem de milho. Amostras de sangue, de urina e dos alimentos ingeridos foram colhidas antes do ingresso na pastagem (maio), e nos estágios inicial (junho), intermediário (julho) e final (setembro) do ciclo de maturação da forragem. Foram determinadas as concentrações séricas e urinárias de Ca, P, Mg, Na+, K+, Cl- e creatinina e calculada as excreções fracionadas. Nas amostras de alimento foram determinadas a matéria seca (MS) e as concentrações de Ca, P, Mg, Na, K, Cl e S, e calculou-se a diferença entre cátions e ânions da dieta (DCAD) nos diferentes momentos. Com base nas evidências pode-se afirmar que vacas leiteiras em lactação mantidas em pastagem de aveia e/ou de azevém nos meses de inverno podem desenvolver hipocalcemia e exibir sinais clínicos e resposta ao tratamento similares aos da hipocalcemia puerperal clássica, mesmo não sendo recém paridas. A ingestão de aveia e azevém, substituindo parcialmente a silagem de milho como volumoso da dieta, não provoca desequilíbrio eletrolítico e não interfere com a calcemia, a fosfatemia ou a magnesemia de vacas lactantes de alta e de média produção. A utilização das forrageiras de inverno como a única ou principal fonte de volumoso da dieta parece ser o fator desencadeante da doença e pode estar relacionada com o excesso de cátions ingeridos devido à elevada concentração de K, principalmente, quando a planta é jovem.

          Translated abstract

          Non-parturient hypocalcaemia (NPH) is a rare and poor understood condition. There are no studies that explain its relationship with winter pasture intake. The aim of this study was to describe clinical aspects of two natural cases of NPH, and to study the mineral and electrolyte balance of high and medium producing dairy cows feeded with winter pasture in different growing stages. Two cases of NPH in lactating dairy cows, grazing in oat grass and perennial ryegrass in Francisco Beltrão, PR, Brazil, were described. Healthy lactating high producing Holstein cows (n=11) and medium producing Holstein (n=8) and Jersey (n=9) cows were selected from three farms located in the same municipality. They were maintained in a mixing pasture of oats and perennial ryegrass from June to October, and supplemented with corn silage. Blood, urine and ingested food samples were collected before treatment started (May), and during initial (June), intermediate (July) and final stages (September) of the grass maturation cycle. Serum and urinary concentrations of Ca, P, Mg, Na+, K+, Cl- and creatinine were determined, and their fractional excretion were calculated. Dry matter and Ca, P, Mg, Na, K, Cl and S concentrations were determined in food samples, and the dietary cation-anion difference was calculated. Based on clinical evidence we can assure that lactating dairy cows maintained in oat and perennial ryegrass pastures during the winter months can develop hypocalcaemia, showing signs and responding to treatment similar to classic puerperal hypocalcaemia, even in non-parturient period. Partial substitution of corn silage to oat and perennial ryegrass pasture did not cause electrolyte imbalances and did not interfere with the calcemia, phosphatemia or magnesemia of high and medium producing lactating dairy cows. Using winter forage as the only or main source of roughage in the diet can be the triggering factor for the disease, which can be related to excessive cation intake due to increased K concentration, especially during early stages of pasture growing.

          Related collections

          Most cited references28

          • Record: found
          • Abstract: not found
          • Article: not found

          Nutrient requirement of dairy cattle

          (2001)
            Bookmark
            • Record: found
            • Abstract: not found
            • Article: not found

            Metodologia e Análise da Pesquisa em Ciências Biológicas

              Bookmark
              • Record: found
              • Abstract: found
              • Article: not found

              Manipulating dietary anions and cations for prepartum dairy cows to reduce incidence of milk fever.

              Twenty preparturient dairy cows were in a 2-yr switchover design to test effects of dietary ions on incidence of milk fever. In yr 1, cows were blocked and assigned randomly 45 days prepartum to one of two diets; one diet contained an excess of anions, and the second diet contained an excess of cations. In yr 2, cows were changed to the opposite diet. Both diets were equivalent for crude protein (11%), calcium (.65%), phosphorus (.25%), and energy on a dry basis but differed for quantities of chlorine, sulfur, and sodium. Both diets were chopped alfalfa hay, corn silage, high moisture corn, and vitamin-mineral mix. Diets were available ad libitum as complete rations. There were no differences in dry matter intake of the diets. Cows consuming the anionic diet had no milk fever, but cows consuming the canionic diet had 47.4% incidence. Samples of blood plasma showed that cows consuming the anionic diet maintained calcium and phosphorus through parturition, whereas cows consuming the cationic diet decreased in these minerals around calving. Hydroxyproline was higher for cows consuming the anionic diet during the peripartal period compared to cows consuming the cationic diet. Milk produced in the lactation subsequent to prepartum treatment was 6.8% less for cows offered the cationic diet. When milk production of paretic and nonparetic cows offered the cationic diet was compared, milk was reduced 14% with milk fever.
                Bookmark

                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                pvb
                Pesquisa Veterinária Brasileira
                Pesq. Vet. Bras.
                Colégio Brasileiro de Patologia Animal - CBPA (Rio de Janeiro )
                1678-5150
                January 2014
                : 34
                : 1
                : 15-23
                Affiliations
                [1 ] Universidade Estadual de Londrina Brazil
                [2 ] Universidade Estadual de Londrina Brazil
                Article
                S0100-736X2014000100003
                10.1590/S0100-736X2014000100003
                2084fe93-adb8-40c0-849e-3c32f1b46b8d

                http://creativecommons.org/licenses/by/4.0/

                History
                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0100-736X&lng=en
                Categories
                VETERINARY SCIENCES

                General veterinary medicine
                Hyocalcemia,dairy cows,metabolic disease,calcium metabolism,Avena sativa,Lolium multiflorum,Hipocalcemia,bovinos leiteiros,doenças metabólicas,metabolismo de cálcio

                Comments

                Comment on this article