• Corpus ID: 49570248

Heat Stress Effect on Immune Function in Dairy Cattle

  title={Heat Stress Effect on Immune Function in Dairy Cattle},
  author={Geoffrey E. Dahl and Robert Joseph Collier},
Environmental factors, particularly heat stress, present challenges to dairy cow productivity and health. In the absence of active cooling, exposure to elevated temperatures and humidity significantly reduce dry matter intake during lactation, and subsequent declines in milk yield can approach 25% depending on the severity and duration of the heat stress (reviewed by West, 2003). Lactating cows make metabolic adaptations which repartition additional energy away from productive purposes such… 

Impacts of heat stress on immune responses and oxidative stress in farm animals and nutritional strategies for amelioration

The body of knowledge on heat stress impacts on immune response in farm animals is reviewed, identifying the shift in immune response from cell-mediated towards humoral response, thereby weakening the immune status of the animal.



Invited review: heat stress effects during late gestation on dry cows and their calves.

Benefits of heat stress during late gestation on dairy cattle are introduced, and the biological mechanisms that underlie the observed production and health responses in the dam and her fetus are discussed.

Heat-stress abatement during the dry period: does cooling improve transition into lactation?

It is suggested that heat-stress abatement in the dry period improves subsequent lactation, possibly via suppression of plasma prolactin surge around calving, SOCS-2 expression, and regulation of hepatic lipid metabolism.

In utero heat stress decreases calf survival and performance through the first lactation.

The data suggest that heat stress during the last 6wk of gestation induces a phenotype that negatively affects survival and milk production up to and through the first lactation of offspring.

Heat stress abatement during the dry period influences metabolic gene expression and improves immune status in the transition period of dairy cows.

It is suggested that HT abatement during the dry period improved innate and acquired immune status as measured by neutrophil function and immunoglobulin secretion against ovalbumin challenge, and altered hepatic gene expression related to PRL signaling in the periparturient period or subsequent lactation.

Effects of heat-stress on production in dairy cattle.

  • J. W. West
  • Environmental Science, Medicine
    Journal of dairy science
  • 2003
Maintaining cow performance in hot, humid climatic conditions in the future will likely require improved cooling capability, continued advances in nutritional formulation, and the need for genetic advancement which includes selection for heat tolerance or the identification of genetic traits which enhance heat tolerance.

Interactions of heat stress and bovine somatotropin affecting physiology and immunology of lactating cows.

Using bST during summer in subtropical climate zones requires careful management to avoid overexposure of bST-treated cows to heat stress, and hyperthermia induced by heat stress and associated changes were greater for cows treated with bST.

Effects of heat stress and plane of nutrition on lactating Holstein cows: I. Production, metabolism, and aspects of circulating somatotropin.

Reduced nutrient intake accounted for just 35% of the HS-induced decrease in milk yield, and modest changes in the somatotropic axis may have contributed to a portion of the remainder.

Effect of heat stress during late gestation on immune function and growth performance of calves: isolation of altered colostral and calf factors.

Heat stress during the last 6 wk of gestation negatively affects the ability of the calf to acquire passive immunity, regardless of colostrum source, according to calf immune response and growth performance.

Effect of late-gestation maternal heat stress on growth and immune function of dairy calves.

It is concluded that heat stress of the dam during the dry period compromises the fetal growth and immune function of offspring from birth through weaning.

Effect of cooling during the dry period on immune response after Streptococcus uberis intramammary infection challenge of dairy cows.

It is hypothesized that cooling during the dry period improves immune response to postpartum intramammary infection (IMI) by environmental pathogens such as Streptococcus uberis by altering immune function and neutrophil response to IMI in early lactation.