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Influência da condição corporal e da concentração de energia nas dietas no periparto sobre o desempenho de cabras em lactação Translated title: Body condition score and peripartum energy density on performance of dairy goats

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      Abstract

      Este trabalho foi realizado com o objetivo de avaliar os efeitos da interação nível de energia líquida (EL) nas dietas × condição corporal (CC) no periparto sobre o desempenho de cabras nos primeiros 60 dias da lactação e as concentrações plasmáticas de ácidos graxos não-esterificados (AGNE) no pós-parto. Os animais foram distribuídos em delineamento inteiramente casualizado, em esquema fatorial 2 x 3 x 2 com quatro repetições, composto de duas condições corporais, três níveis de EL (baixo, médio, alto) na dieta no pré-parto e dois níveis de EL (médio, alto) no pós-parto. Inicialmente, os animais foram separados em dois grupos, de acordo com a CC, adotando-se o valor de 3,25 como mediano. Dietas no pré e no pós-parto foram isoprotéicas, com 13 e 16% de PB, respectivamente. No período pré-parto, os níveis de energia das dietas foram 1,1; 1,4 e 1,6 Mcal de EL/kg de MS e, no período pós-parto, de 1,4 e 1,6 Mcal de EL/kg de MS. A interação CC × níveis de EL no pós-parto influenciou o consumo de FDN, de modo que cabras com menor CC consumiram mais fibra (FDN) com a redução da concentração de EL nas dietas. Os níveis de EL fornecidos durante o pós-parto influenciaram o consumo de nutrientes e a produção de leite, pois a presença de níveis elevados de FDN na dieta com 1,4 Mcal EL/kg MS limitou a expressão do potencial produtivo dos animais. Não foram observados efeitos das CC e dos níveis de EL nas dietas sobre a concentração plasmática de AGNE no pós-parto, indicando pequena mobilização de reservas de lipídios do tecido adiposo.

      Translated abstract

      The objective of this trial was to evaluate the effect of body condition score (BCS) and different dietary net energy (NE) levels during prepartum on performance and concentration of plasma non-esterified fatty acids (NEFA) in early lactating dairy goats. Animals (four replicates per treatment) were assigned to a completely randomized design in a 2 x 3 x 2 factorial arrangement of treatments (two BCS, three levels of prepartum NE and two levels of postpartum NE). In the beginning of the trial, animals were separated in two groups according to the BCS assuming 3.25 as the average BCS value. Net energy levels during prepartum were: 1.1, 1.4 and 1.6 Mcal NE/kg DM while at postpartum the values were: 1.4 and 1.6 Mcal NE/kg DM. The interaction between BCS and postpartum NE was significant for NDF intake because goats with lower BCS increased fiber intake when NE was reduced in the diet. Levels of dietary net energy during the postpartum affected both intake and milk yield. There were no effects of dietary NE level and BCS on plasma concentration of NEFA during the postpartum period indicating low mobilization of lipids from adipose tissue.

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      Most cited references 28

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      Regulation of organic nutrient metabolism during transition from late pregnancy to early lactation.

      Conceptus energy and nitrogen demands in late pregnancy are mostly met by placental uptake of maternal glucose and amino acids. The resulting 30 to 50% increase in maternal requirements for these nutrients is met partly by increased voluntary intake and partly by an array of maternal metabolic adaptations. The latter include increased hepatic gluconeogenesis from endogenous substrates, decreased peripheral tissue glucose utilization, increased fatty acid mobilization from adipose tissue, and, possibly, increased amino acid mobilization from muscle. Within 4 d of parturition, mammary demands for glucose, amino acids, and fatty acids are several-fold those of the pregnant uterus before term. Even unusual postparturient increases in voluntary intake cannot satisfy this increased nutrient demand. Therefore, rates of hepatic gluconeogenesis and adipose fat mobilization are greatly accelerated. Concomitant changes in amino acid metabolism include increased hepatic protein synthesis and, possibly, decreased amino acid catabolism, and increased peripheral mobilization of amino acids. Insulin resistance in adipose tissue and muscle, developed during late pregnancy, continues postpartum; adipose lipolytic responsiveness and sensitivity to adrenergic agents are increased postpartum beyond their levels during late pregnancy. Before parturition, these homeorhetic adjustments may be coordinated with lactogenesis by increased secretion of estradiol and prolactin. Their amplification and reinforcement at and soon after parturition may be regulated mostly by somatotropin.
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        Análise de alimentos (métodos químicos e biológicos)

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          Nutrient Requirements of Goat

          (1981)
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            Author and article information

            Affiliations
            [1 ] Universidade Federal de Viçosa Brazil
            [2 ] Universidade Federal de Viçosa Brazil
            [3 ] Universidade Federal da Amazônia
            Contributors
            Role: ND
            Role: ND
            Role: ND
            Role: ND
            Role: ND
            Journal
            rbz
            Revista Brasileira de Zootecnia
            R. Bras. Zootec.
            Sociedade Brasileira de Zootecnia (Viçosa )
            1806-9290
            August 2006
            : 35
            : 4
            : 1560-1567
            S1516-35982006000500039
            10.1590/S1516-35982006000500039

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

            Product
            Product Information: SciELO Brazil
            Categories
            AGRICULTURE, DAIRY & ANIMAL SCIENCE
            VETERINARY SCIENCES

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