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Biomedical subjects

W M Newton

Publications and source records attributed to W M Newton.

7 recordsLinked to original sources
PubMed1978

Acclimation of young calves to high temperatures: physiologic responses.

Four 2- to 3-month-old male Bos taurus calves kept in an ambient environment of 18.3 C and 50% relative humidity for a week were then exposed to 40.5 C and 50% relative humidity atmosphere in a climatic chamber for short-term (2 weeks) acclimation. The exposure time was 12 hours each day. Their respiratory rate, skin temperature, and rectal temperature rose sharply on the 1st day of exposure and then gradually declined with continued exposure. The heart rate, on the ohter hand, declined with successive days of exposure. A gradual increase in sweating rates of calves was observed after the 2nd day of exposure. Most of the acclimation in these physiologic measurements was completed in the first 9 to 10 days of exposure and it was concluded that young calves have a well-developed power of acclimation to high temperature

Acclimatization↗
PubMed1978

Acclimation of young calves to high temperatures: composition of blood and skin secretions.

Total nitrogen and sodium and potassium contents of blood serum and of skin secretions were measured in four 2- to 3-month-old male Bos taurus calves subjected to a 2-week acclimation process in a climatic chamber at 40.5 C, 50% relative humidity, 12 hours each day. Secretions from the skin were absorbed in filter papers that were the used for analysis of sodium, potassium, and total nitrogen. Significant change in serum sodium, potassium, or nitrogen was not observed. A significant (P less than 0.01) rise in the nitrogen content of skin secretions was observed on the 1st day of exposure and continued throughout the entire exposure period. Similarly, there was a significant (P less than 0.01) increase in the content of sodium and potassium in skin secretions. The secretions contained about 2 times more potassium than sodium.

Acclimatization↗
PubMed1975

Innovar-Vet-induced pathologic changes in the guinea pig.

High doses of Innovar-Vet administered im induced pathologic changes in tissues at the site of drug deposition. The onset and extent of the changes were dose related. Distal self-mutilation occurred coincidentally to the peak of pathologic changes in the ischiatic nerve.

Anesthesia↗