35 documents found, page 1 of 4
Thermoregulatory Responses of Heat Acclimatized Buffaloes to Simulated Heat Waves
Pereira, A.M.F.; Vilela, R.; Titto, C.; Leme dos Santos, T; Geraldo, A.; Balieiro, J.; Calviello, R; Birgel Jr, E; Titto, EClimate change is seen as a significant threat to the sustainability of livestock production systems in many parts of the world, particularly in tropical regions. Extreme meteorological events can result in catastrophic production and death of livestock. Heat waves in particular can push vulnerable animals beyond their survival threshold limits. However, there is little information about buffalo responses to su...
Thermoregulatory response in hair sheep and shorn wool sheep
Titto, C.G.; Veríssimo, C.J.; Pereira, A.M.F.; Geraldo, A.M.; Katiki, L.M.; Titto, E.A.L.This study’s main goal was to evaluate the thermoregulatory responses velocity through the variation of rectal temperature (RT), related to the thermolytic pathways, respiratory rate (RR) and sweating rate (SR) among different sheep breeds. Ninety female sheep, eighteen of each breed: Santa Ines and Morada Nova (Brazilian hair breeds), Texel, Suffolk and Ile de France (wool breeds) were challenged during three ...
Effect of artificial shading on performance and reproductive parameters of semi...
Chiquitelli Neto, M.; Titto, C.G.; Titto, E.A.L.; Costa e Silva, T.S.; Puoli Filho, J.N.P; Leme, T.M.; Henrique, F.L.; Pereira, A.M.F.Thirty Brangus bulls were used in a 90-d study to assess the effect of artificial shading on the performance and reproductive characteristics of semi-confined cattle. Animals were kept in four one-ha paddocks in two groups of eight for shade treatment (5 m²/animal of 80% solar block shade cloth) and two groups of seven animals in no-shade treatment. Each treatment had two homogeneous groups, each divided into h...
Evaluation of reactivity of horses in the presence of unknown stimulus
Calviello, R.F.; Titto, C.G.; Titto, E.A.L.; Infante, P.; Leme, T.M.; Pereira, A.M.F.The study aimed to evaluate reactivity of horses during usual brushing management against the repeated presence of an unknown sonorous stimulus. Twenty Mangalarga Marchador horses, distributed in different categories (mares and foals), were evaluated. The animals were allocated into the control treatment (N = 10) and the treatment with unknown sonorous stimulus (N = 10) from a rattle and a tambourine. Four cons...
Heat stress and ACTH administration on cortisol and insulin-like growth factor ...
Titto, C.G.; Negrão, J.A.; Titto, E.A.L.; Canaes, T.S.; Titto, R.M.; Leme-dos-Santos, T.M.; Henrique, F.L.; Pereira, A.M.F.Physiological and productive responses were studied in five Holstein cows in thermal comfort (T1), stress by exogenous adrenocorticotropic hormone (ACTH) administration (T2) and heat stress (T3) to compare acute and punctual stress (ACTH) and prolonged stress (heat stress). During T1 and T2, cows were housed in a climatic-free stall barn. In T3, the animals were kept in a climatic room (air temperature of 37°C ...
HSPA1A relative gene expression in bovine leukocytes by in vitro heat shock
Hooper, H.B.; Henrique, F.L.; Longo, A.L.S.; Rodriguez, L.F.P.; Gonella-Diaza, A.M.; Geraldo, A.C.A.P.; Pereira, A.M.F.; Titto, C.G.The thermotolerance is the cell adaptation caused by a single exposure to heat,severe but not lethal. which enables the organismo to survive a subsequente lethal stress by the synthesis or accumulation of HSP.The results did not show a increase of HSP in Nelore cow leukocytes. The nelore leukocytes mantain abundance of transcripts in 38 and 40ºC but had a sunbstancial decrease at 42ºC , probably because at this...
Application of thermolysis capacity test for Santa Inês, Dorper and White merin...
Leme dos Santos, T.M.; Amadeu, C.C.; Geraldo, A.C.M.; Titto, C.G.; Pereira, A.M.F.; Titto, E.A.L.The results show that hair breed of tropical origin is affected by sun exposure. However, sheep are able to return to the initial physiological state very quickly showing differents degrees of resistance to thermal variances
Biomarkers for seasonal heat stress
Pinheiro, C.; Lamy, E.; Pereira, A.M.F.Environmental heat stress, present during the hot and dry summers in Mediterranean climate, severely impairs animal’s performance, particularly in animals of high genetic merit. Although heat stress has been considerable studied in dairy cattle, the mechanisms of seasonal acclimation are less well understood. Biomarkers may have great potential in identifying levels of thermal stress. The blood cortisol does no...
Suplementação com Cromo, reactividade e níveis de cortisol, glucose e insulin e...
Leme, M.; Titto, C.G.; Titto, E.A.L.; Geraldo, A.C.M.; Calviello, R.F.; Silva, S.L.; Pereira, A.M.F.O estudo foi desenvolvido para investigar os efeitos da suplementação dietética de cromo sobre os indicadores de bem-estar de ovinos confinados. Sessenta e quatro cordeiros cruzados White Dorper x Santa Inês, desmamados aos sessenta dias de idade, foram divididos em dois grupos para terminação, por sessenta dias, em confinamento: grupo controle e grupo que recebeu suplementação de 2 mg cromo orgânico diariament...
Effect of mineral mixture on behavior patterns of Portuguese native heifers dur...
Prates, L.; Dias, T.; Castro, J.; Geraldo, A.C.M.; Titto, C.G.; Titto, E.A.L.; Infante, P.; Quintiliano, M.; Pereira, A.M.F.The aim of this study was to evaluate the effect of supplementation with protein enriched mineral salt in behavior and productive performance of heifers of native breeds during the Spring and Summer in a Mediterranean climate. The study was conducted between April and August, during 150 days. Two homogeneous groups of heifers (± 8 months of age) were formed and assigned in two treatments: without mineral salt (...