Data/hora: 13/06/2024 04:37:28

Provedor de dados: | 109
País: | Colombia
Título: | A conceptual model to describe heat stress in dairy cows from actual to questionable loops
Autores: | Molina Benavides,Raúl Andrés; Sánchez Guerrero,Hugo; Atzori,Alberto Stanislao.
Data: | 2018-03-01
Ano: | 2018
Palavras-chave: | Climate change; Grazing; Livestock production systems; Milk production; System dynamics; Temperature.
Resumo: | Abstract Thermal environment is recognized to be one the most important ecological factor to determine domestic animal growth, development and productivity for direct and indirect effects on its physiology and behavior. Despite having specific and individual adaptation, is very common, within seasonal or diurnal temperature variations, animals deal with situations outside their thermal comfort zone. Due to heat stress, dairy cows reduce milk production and fertility, and therefore, had achieved an increasing in metabolic disorders incidence, causing low revenues to farm in short and medium periods. Due to world climate change more impact of the meteorological variables on animal responses is expected for the future. This study aimed to describe and understand the interactions of variables associated with heat stress in dairy cattle. System thinking approach to this specific physiological mechanism might help to better focus managerial aspects related to grazing conditions and animal needs. A causal loop diagram annotation used to connect biological variables included in system boundaries. Causal connections were validated with literature citations on the heat stress influence. The most important feedback loops highlighted underline dominant structure and expected patterns. Four balancing loops involved in physiological mechanisms used by animals in order to reduce metabolic heat production and to regulate homeostasis of the internal temperature, were found.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000100059
Editor: | Universidad Nacional de Colombia
Relação: | 10.15446/acag.v67n1.60612
Formato: | text/html
Fonte: | Acta Agronómica  v.67 n.1 2018
Fonte: | info:eu-repo/semantics/openAccess