The chemiluminscence (CL) activity of peripheral blood polymorphonuclear leukocytes (PMNL) in cattle declined with the administration of ACTH, used when cattle are stressed. In the case of −5ºC exposure, this tendency was also observed, however, the CL activity quickly recovered after ACTH administration. In the case of 35ºC exposure, the CL activity decreased approximately 13% of the pre-administration level and was lower than the base line during the observation period.
These findings reveal that cold and heat environments tend to enhance and suppress PMNL function in rearing cattle administered stress, respectively. (Animal Hygiene Lab., Department of Grazing Animal Production, National Institute of Livestock and Grassland Science TEL +81-287-37-7239)
References:
Ishizaki, H. and Y. Kariya: Effects of peripheral blood polymorphonuclear leukocyte function and blood components in Japanese Black steers administered ACTH in a cold environment. J. Vet. Med. Sci., 61: 487-492 (1999).
