Respostas fisiológicas de cabras leiteiras criadas na região litorânea do estado do Ceará.

Esse estudo foi conduzido no sitio Acuã na região litorânea do estado do Ceará no período de junho a dezembro de 2000 com o objetivo de avaliar as variações nas concentrações hormonais de T3 e T4 de cabras leiteiras em diferentes épocas de coletas. Foram utilizadas 22 fêmeas caprinas das raças Saanen (n=1O), 1/2 Murciana (n=8), Alpina Americana (n=4) com idade variando entre I a 5 anos e entre a 1a e 4a parição. Na indução do estro foram utilizadas esponjas intra - vaginais de cloprostenol e gonadotrofina eqüina. Não houve efeito significativo entre as variáveis meteorológicas com a temperatura retal e a freqüência respiratória. As concentrações plasmáticas dos hormônios T4 não foram significativas entre raças. O nível hormonal de T3 foi menor nos animais das raças Alpinas Americanas e os valores da TR e FR foram maiores que nas cabras da raça Saanen. Essa resposta adaptativa dos animais da raça Saanen deve-se a aclimatação as condições ambientais da região. Os níveis séricos dos hormônios tireoideanos foram afetados pelas variáveis ambientais porém os animais mantiveram a homeotermia não ocorrendo o estresse térmico.Disponível em separata

Genetic diversity and population structure of different varieties of Morada Nova hair sheep from Brazil.

Made available in DSpace on 2018-07-12T01:02:04Z (GMT). No. of bitstreams: 1 gmr2908.pdf: 709034 bytes, checksum: 687aba91750471851cf3620e3428c4ab (MD5) Previous issue date: 2015-01-21bitstream/item/116096/1/gmr2908.pd

Plant proton pumps as markers of biostimulant action.

ABSTRACT A standard protocol to evaluate the effects of biostimulants on plant physiology is still lacking. The proton pumps present in the vacuolar and plasma membranes are the primary agents responsible for the regulation of the electrochemical gradient that energizes the nutrient uptake system and acid growth mechanism of plant cells. In this study, two of these enzymes were characterized as biochemical markers of biostimulant activity. A simple and fast protocol based on the degree of root acidification using a pH sensitive dye and the Micro-Tom tomato as a plant model is proposed as an efficient methodology to prove the efficacy of biostimulants that are claimed to improve nutrient acquisition and root growth. The results agree with the data from more conventional, expensive and time-consuming proton pump assays. A direct correlation was found between plasmalemma proton-adenosine triphosphatase (H+-ATPase) activation and the amount of rhizosphere acidification observed in the bromocresol gel. Moreover, roots of the diageotropica (dgt) Micro-Tom plants, defective in auxin responses, barely acidify bromocresol purple gel even in the presence of indole-3-acetic acid (IAA, 1 μM). The biostimulant TEA (vermicompost water extract, 25 %) enhances proton extrusion by 40 % in wild type (WT) plants, but no effect was induced in dgt plants. These results reinforce the notion that the class of biostimulant known as humic substances stimulates plant proton pumps and promotes root growth by exerting an auxin-like bioactivity and establish the usefulness of an economically and technically feasible assay to certify this kind of biostimulant

Características termorreguladoras e desempenho de cabras leiteiras no terço inicial da lactação em clima tropical.

Resumo: Teve-se como objectivo avaliar o comportamento de características termorreguladoras, a condição corporal e a produção de leite no início da lactação de 45 cabras de diferentes tipos raciais (15 da raça Saanen, 15 cruzadas Sem Padrão Racial Definido (SPRD) x Murciana e 15 Alpinas Americanas). Foram tomadas a temperatura retal, a freqüência respiratória, o escore da condição corporal a produção diária de leite e as concentrações plasmáticas de triiodotironina (T3) e tiroxina (T4) avaliados até os 36 dias da lactação. As concentrações de T3 e T4 foram obtidas pelo método de radioimunoensaio. As variáveis meteorológicas foram registradas às 15 h, no mesmo horário da coleta dos dados fisiológicos. Os resultados obtidos indicaram que as cabras da raça Alpina Americana tiveram as maiores temperaturas retais e frequencias respiratórias, além de menores concentrações de triiodotironina e tiroxina, associados a menor produção de leite e condição corporal possivelmente como reflexo de menor adaptação ao clima. As cabras Saanen e _ Murciana SPRD apresentaram menores temperaturas retais e frequencias respiratórias, maior escore da condição corporal e concentrações séricas de triiodotironina e tiroxina. As temperaturas retais foram iguais entre os grupos genéticos _ SPRD x _ Murciana e diferente para as cabras saanen. No terço inicial de lactação animais mestiços leiteiros juntamente com as cabras Saanen, demonstraram maior adaptabilidade, bom desenvolvimento corporal e melhor desempenho lactacional. As cabras Alpinas Americanas mostraram menores respostas adaptativas e produtivas o que evidencia a importância do ambiente térmico na criação desses animais. [Thermoregulatory traits and performance of dairy goats in early lactation in tropical weather]. Abstract: The objective of this study was to evaluate physiological and performance characteristics in early lactation of dairy goats of several breeds, namely thermoregulation, body condition and milk production. Forty five females were used (15 Saanen, 15 of crosses between undefined breed and _ Murciana and 15 American Alpine). Records were made of rectal temperature, respiratory rate, body condition score and daily milk production in the 36 first days of lactation. Plasma concentrations of triiodothyronine and thyroxine were obtained by radioimmunoassay method. The meteorological variables were registered at 15 pm, at the same time as the collection of physiological indicators. Results indicate that American Alpine goats had higher rectal temperatures and respiratory frequency, lower concentration of triiodothyronine and thyroxine, associated to a smaller milk production and body condition, possibly due to the worse climate adaptation. Saanen and _ Murciana crosses presented lower rectal temperatures and respiratory frequency, higher body score and triiodothyronine and thyroxine concentrations. Rectal temperatures were similar between the genetic groups undefined breed x _ Murciana and different for Saanen goats. In the initial third of lactation crossbred goats along with Saanen goats showed greater adaptability, good physical development and better milk production. The American Alpine goats showed less productive and adaptive responses which highlights the importance of the thermal environment in the management of these animals

Bioactive compounds and antioxidant activity on custard apple and atemoya fruits cultivated in Sub-Middle of São Francisco River Valley, Brazil.

The objective of this study is to determine the content of bioactive compounds and the total antioxidant activity of the cream Apple and atemoya fruits grown in the sub-basin of São Francisco Valey, Brazil