Effect of heat stress on milk production, rectal temperature, respiratory rate and blood chemistry in Holstein, Jersey and Australian milking Zebu cows

A. Srikandakumar, E. H. Johnson

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

The effect of heat stress on changes in milk production, rectal temperature, respiratory rate and blood chemistry was evaluated in three groups of six mature Holstein, Jersey and Australian Milking Zebu (AMZ) dairy cows. These animals were subjected to a cool environment when the mean temperature-humidity index (THI) was 72±1.4 (dry bulb temperature of 22.2-24.4°C and relative humidity of 100-60%) during the month of December. This experiment was repeated during the hotter month of July of the following year, when the mean THI was 93±3.1 (dry bulb temperature of 35.6-43.9°C and relative humidity 95-35%). Holstein cows produced more (p2 (kPa), bicarbonate (HCO 3 -, mmol/L), base excess (BE, mmol/L) and plasma chloride (Cl -, mmol/L) in all three breeds. The total haemoglobin (THb, g/dl) was elevated (p2SAT, %) in Jersey and AMZ cows but lowered it (p2 (kPa) in Holstein and Jersey cows but lowered it (p

Original languageEnglish
Pages (from-to)685-692
Number of pages8
JournalTropical Animal Health and Production
Volume36
Issue number7
DOIs
Publication statusPublished - 2004

Fingerprint

blood chemistry
Jersey
Respiratory Rate
zebu
respiratory rate
milking
heat stress
milk production
Milk
Humidity
Holstein
Hot Temperature
cows
Temperature
temperature
bulbs
humidity
relative humidity
Bicarbonates
bicarbonates

Keywords

  • blood chemistry
  • dairy cows
  • heat stress
  • milk production
  • rectal temperature
  • respiratory rate

ASJC Scopus subject areas

  • Immunology
  • Animal Science and Zoology
  • veterinary(all)

Cite this

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