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      Serum concentration of thyroid hormones in crioula lanada serrana ewes in gestation and lactation Translated title: Concentrações séricas dos hormônios tireoidianos em ovelhas crioula lanada serrana na gestação e lactação

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          Abstract

          The effects of gestation and lactation on the dynamics of the thyroid hormones, triiodothyronine (T3) and thyroxine (T4) were evaluated in Crioula Lanada Serrana ewes from the plateau region in Santa Catarina - Brazil. To evaluate the effects of gestation, twenty four ewes were randomly divided into groups I and II. Group I was composed of 12 pregnant ewes and the control group (II) was composed of 12 non-pregnant ewes. The effects of lactation were evaluated in the same ewes of group I after parturition (LE) and in the control group (NL). Blood samples were taken in the first, second and third periods of gestation, at parturition, and at 30, 60 and 90 days of lactation. T3 and T4 concentrations were determined by radio-immunoassay (RIA). Pregnant ewes showed lower serum concentrations of T3 and T4 than those of non-pregnant ewes. At parturition, there was no significant difference in T3 concentrations between groups I and II (p>0.05). During lactation, serum T3 concentrations were lower (p<0.05) in LE than in NL ewes. Serum T3 concentrations were greater (p<0.05) at lambing than during the lactation periods. Serum T4 concentrations in LE at parturition did not differ (p>0.05) from those of NL ewes. During lactation, T4 concentrations of LE were lower (p<0.05) than those of the NL ewes. The results of this study have shown that gestation causes a variation in the T3 and T4 serum concentrations, and that lactation results in a decrease of serum concentrations of T3 and T4 in Crioula Lanada Serrana ewes.

          Translated abstract

          Os efeitos da gestação e lactação sobre a dinâmica dos hormônios tireoidianos triiodotironina (T3) e tiroxina (T4) foram avaliados em ovelhas Crioula Lanada Serrana na região do Planalto Serrano Catarinense. Para avaliar os efeitos da gestação, foram utilizadas vinte e quatro ovelhas distribuídas aleatoriamente em dois grupos. O grupo I foi formado por 12 ovelhas gestantes e o grupo controle por 12 ovelhas não gestantes (grupo II). Os efeitos da lactação foram avaliados nas mesmas ovelhas do grupo I após a parição (LE) e no grupo controle (NL). Foram colhidas amostras sanguíneas no primeiro, segundo e terceiro terço da gestação, ao parto e aos 30, 60 e 90 dias de lactação. As concentrações de T3 e T4 foram determinadas por radioimunoensaio (RIA). As ovelhas gestantes apresentaram concen-trações séricas de T3 e T4 inferiores àquelas não gestantes. Ao parto não houve diferença significativa nas concentrações de T3 entre os grupos I e II (p>0,05). Durante a lactação as concentrações de T3 foram menores (p<0,05) para LE que para NL. No momento do parto, as concentrações de T3 foram maiores (p<0.05) do que aquelas observadas no período de lactação e as concentrações de T4 em LE, não diferiram de NL. Durante a lactação as concentrações de T4 de LE foram menores (p<0,05) do que em NL. Os resultados deste estudo demonstraram que a gestação causa variação nas concentrações séricas de T3 e T4 que, no momento do parto são similares àquelas observadas em ovelhas não gestantes. A lactação causa diminuição nas concentrações de T3 e T4 em ovelhas Crioula Lanada Serrana.

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          Most cited references53

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          Tratado de fisiologia médica

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            Maternal and fetal thyroid function.

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              Bovine somatotropin: review of an emerging animal technology.

              D E Bauman (1992)
              One of the first potential biotechnology products for animal production is bST. Research in the technology of bST has involved scientists and support from federal agencies, universities, and private industry. As a consequence of this extensive cooperation, more than 1000 bST studies have been conducted, which involved over 20,000 dairy cows, and results have been confirmed by scientists throughout the world. This quantity of published research is unprecedented for a new technology and greater than most dairy technologies in use. In contrast to steroids, bST is a protein hormone. Milk yield and persistency responses to bST have been observed for all dairy breeds examined. Quality of management is the major factor affecting magnitude of milk response to bST. The mechanism of action of bST involves a series of orchestrated changes in the metabolism of body tissues so that more nutrients can be used for milk synthesis. It is these coordinated changes that allow the animal to achieve an increased milk yield while remaining normal and healthy. Bioenergetic studies demonstrated that bST-supplemented animals are not stressed. Similarly, there are no adverse health effects from bST even under poor management conditions. Composition of milk (fat, protein, lactose, cholesterol, minerals, and vitamins) is not substantially altered when bST is used and does not differ in manufacturing characteristics. Public perception is of paramount importance if bST or any new technology is to be effectively implemented. New technology must be understood and perceived as safe and beneficial both by farmers, who would utilize it, and consumers, who would purchase the dairy products. With bST use, a unit of milk is produced with less feed and protein supplement and with a reduction in animal excreta (manure, urine, and methane). Nationally, the use of bST simply reinforces, but does not fundamentally change, dairy industry trends of increased milk yield per cow, reduced number of cows, and declining dairy farm numbers. For individual farms, bST technology is size-neutral. However, poorly managed farms where animals are stressed, underfed, or sick are at an economic disadvantage because they will achieve negligible milk response to bST.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                azoo
                Archivos de Zootecnia
                Arch. zootec.
                Universidad de Córdoba (Córdoba )
                0004-0592
                December 2010
                : 59
                : 228
                : 509-517
                Affiliations
                [1 ] Universidade do Estado de Santa Catarina Brazil
                [2 ] Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina (EPAGRI) Brazil
                [3 ] Universidade Federal de Minas Gerais (UFMG) Brazil
                Article
                S0004-05922010000400004
                10.4321/s0004-05922010000400004
                0d8b3eec-8d19-41c0-8277-1ea5e83532d1

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

                History
                Categories
                AGRICULTURE, DAIRY & ANIMAL SCIENCE
                VETERINARY SCIENCES

                Animal agriculture,General veterinary medicine
                Thyroid,Hormones,Reproduction,Tireóide,Hormônios,Reprodução

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