
doi: 10.1071/ea97039
Summary. Shade-type preferences by Holstein–Friesian cows were investigated under natural climatic conditions. The trial was conducted in south-east Queensland, Australia, over 88 days in summer. Forty-two cows were placed in a dirt-floored yard (zero grazing) provided with different shade types. Shade types provided were a 3 m high galvanised iron roof, Sechium edule (choko) vines on a 3 m high trellis, 70% shade cloth on a 3 m high frame and natural shade trees. The floor area under the shade structures was concrete. An unshaded area (the remainder of the yard) was also provided. Each cow was scored for coat colour based on the proportion of black and white. Number of cows using a particular shade type and their respiration rates were recorded daily at 1300 hours. Ambient temperature, relative humidity, solar radiation and wind speed were also measured. Cows selected the galvanised iron roof most frequently when temperatures rose above 30°C, with no significant differences between the other shade types. At temperatures below 30°C, animals did not seek shade. As ambient temperature, solar radiation and relative humidity rose, respiration rate rose. Cows with a high percentage of black coat preferred shade, while those with a high percentage of white coat did not seek shade.
Dairy-Cattle, Heat-Stress, 630
Dairy-Cattle, Heat-Stress, 630
| selected citations These citations are derived from selected sources. This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | 28 | |
| popularity This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network. | Top 10% | |
| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Top 10% | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Average |
