Encontrados 13 documentos, a visualizar página 1 de 2
Influence of stocking density on weight and behavior of feedlot lambs
Leme, T.M.; Titto, E.A.L.; Neto, M.C.; Pereira, A.M.F.The aim of this study was to verify the influence of the animal density on the weight gain and behavior of confined lambs. 86 animals were confined after weaning in 23 pens of two lambs each (double pens) and four pens of ten animals each (collective pens). During the 80 days of confinement all lambs received the same diet and the animals were weighed at the beginning of the trial and every 14 days for the cont...
Effects of an evaporative cooling system on plasma cortisol, IGF-I, and milk pr...
Titto, C.G.; Negrão, J.A.; Titto, E.A.L.; Canaes, T.S.; Titto, R.M.; Pereira, A.M.F.Access to an evaporative cooling system can increase production in dairy cows because of improved thermal comfort. This study aimed to evaluate the impact of ambient temperature on thermoregulation, plasma cortisol, insulin-like growth factor 1 (IGF-I), and productive status, and to determine the efficiency of an evaporative cooling system on physiological responses under different weather patterns. A total of ...
Respostas fisiológicas e comportamentais de vacas Holandesas mantidas em sistem...
Vilela, R.A.; Leme, T.M.; Neto, P.F.; Balieiro, J.C.C.; Titto, E.A.L.; Pereira, A.M.F.Este estudo teve como objetivo avaliar a influência de recursos de climatização, ventilação e nebulização, sobre a fisiologia e o comportamento de vacas Holandesas alojadas em free-stall, durante o verão do sudeste brasileiro. Foram utilizadas 20 vacas Holandesas submetidas a dois tratamentos com e sem climatização. Os parâmetros ambientais registrados foram temperatura de bulbo seco, umidade relativa do ar e t...
In vivo and in vitro heat shock proteins gene expression in cattle.
Geraldo, A.C.A.P.M.; Oliveira, L.J.; Pereira, A.M.F.; Moreira da Silva, F.; Titto, E.A.L.The main purpose for this study was the quantification of the heat shock proteins HSPA1A and HSP90AA1, in cow lymphocytes, when subjected to heat stress directly - in vivo, or indirectly - in vitro. The aim was to identify differences between HSP expression in vitro and in vivo. The experiment was conducted in the Biometeorology and Ethology Laboratory of FZEA-USP. Were used three female Holstein Frisian, which...
What Do Cattle Prefer in a Tropical Climate: Water Immersion or Artificial Shade?
Geraldo, A.C.P.M.; Pereira, A.M.F.; Titto, C.G.; Titto, E.A.L.Animal performance is affected by high air temperature and it is known that shade reduces the absorption of radiant temperature, and water for immersion facilitates heat loss. This study intends to find preferences of resources that contribute for the well-being of cattle and how they alterdaily behaviour. During summer, six Caracu and six Red Angus bulls were submitted to two different treatments: availability...
Assessing heat tolerance of Alentejana and Mertolenga portuguese cattle breeds ...
Pereira, A.M.F.; Titto, E.A.L.; Baccari Jr., F.; Almeida, J.A.A.Abstract Objectives: During summer in Mediterranean regions, well adapted native cattle breeds present differences in environmental tolerance. The objective of this study was to compare heat tolerance of Alentejana and Mertolenga heifers under direct solar radiation, by quantifying the pathways of evaporative thermolysis and thermostability. Materials and Methods: The experiment was carried out in 5 days. 6 Ale...
Behavior of Holstein milking cows exposed to different environmental conditioni...
Vilela, R.A.; Titto, C.G.; Titto, E.A.L.; Pereira, A.M.F.; Pereira, A.C.A.P.M.; Leme, T.M.Objectives: The aim of the study was to evaluate the behavior of dairy cows in summer in relation to the environmental conditioning system (fans with or without misting). Materials and Methods: Twenty Holstein lactating cows were allotted in free-stall pens, divided in two groups: VN ? with fans plus misting; V ? only with fans. The behavior was estimated as time standing and eating, ruminating and idling activ...
Influence of season on plasmatic cortisol and IGF -I in dairy cows under therma...
Titto, E.A.L; Titto, C.G.; Negrão, J.A.; Canaes, S.T; Leme, T.M.; Vilela, R.A.; Geraldo, A.C.A.P.M.; Pereira, A.M.F.; Nogueira Filho, J.C.MObjectives: Access to evaporative cooling system can increase production in dairy cows due to improve thermal comfort. The aim of this study was to evaluate the impact of ambient temperature on thermoregulation, cortisol and IGF-I, and determine the efficiency of evaporative cooling system on the physiological responses in different weather patterns. Materials and Methods: 24 Holstein cows were housed in two gr...
Behavioral aspects of Caracu and Red Angus cattle breeds in a pasture with shad...
Geraldo, A. C. A. P. M.; Pereira, Alfredo Manuel Franco; Nogueira Filho, J.C.M.; Titto, E.A.L.The shade is an important resource in the extensive production systems in tropical regions. The aim of this study is to understand through behavioral analysis, the preferences of animals for resources for environmental protection. The experiment was conducted in the Biometeorology and Ethology Laboratory of FZEA-USP. Six male of Caracu and Red Angus cattle breeds were used. The animals were submitted to 2 diffe...
VARIAÇÃO DA INTENSIDADE DA TERMÓLISE LATENTE EM BOVINOS Bos taurus FACE A AUMEN...
Pereira, A.M.F.; Titto, E.A.L.; Baccari Jr., F.; Almeida, J.A.AO presente estudo teve como objectivo avaliar, em duas raças de bovinos, o comportamento das vias de termólise latente, perante aumentos planeados da temperatura ambiente. Foram utilizados 6 novilhas das raças Frísia e 6 da raça Mertolenga com pesos médios de 403,8±15,5kg e 308,2±31,2Kg, respectivamente. O estudo foi realizado em câmara climática e decorreu durante 12 dias, dividido em 4 fases, cada uma com a d...
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