Thermal balance of cattle grazing winter range: Model development

Keren, Elai N.; Olson, Bret E.

doi:10.1016/j.jtherbio.2005.11.029

Cited by 17 publications

(5 citation statements)

References 32 publications

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“…A perpendicularly standing animal to the sun's ray will absorb more short-wave radiation than one standing parallel to the sun (Clapperton et al, 1965). Factors such as sky conditions, ground cover and the shape and orientation of the animal's body also determine the amount of solar radiation absorbed (Keren, 2005). Prediction models used in the past did not examine the lag of solar radiation nor did they consider solar radiation separately, rather it was considered with other weather variables using an index named current effective temperature index (CETI) which accounts for temperature, humidity, wind speed and sunlight hours (Tedeschi and Fox, 2016).…”

Section: Discussionmentioning

confidence: 99%

Solar radiation and temperature as predictor variables for dry matter intake in beef steers

Yusuf¹,

Swanson²,

Hanna³

et al. 2022

Front. Anim. Sci.

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Solar radiation may be an important weather variable that has not been included in previous dry matter intake (DMI) prediction models. Solar radiation affects the overall effective ambient temperature, which in turn contributes to the net gain of heat in an animal’s body. This experiment examined ambient temperature and solar radiation with DMI in beef steers. Data from 790 beef steers collected between 2011 and 2018 using an Insentec feeding system was used. Daily data was condensed into weekly averages (n = 13,895 steer-weeks). The variables considered for this study were DMI (2.50 to 23.60 kg/d), body weight (197 to 796 kg), calculated dietary energy density (NEm; 0.79 to 2.97 Mcal/kg), ambient temperature (-23.73 to 21.40°C), two-week lag of ambient temperature (-20.73 to 23.56°C), monthly lag of ambient temperature (-17.95 to 22.74°C), solar radiation (30.8 to 297.1 W/m2), two-week lag of solar radiation (34.6 to 272 W/m2) and monthly lag of solar radiation (43.7 to 256.6 W/m2). Residuals of DMI fitting week of the year (fixed) and experiment (random) were used to generate scatter plots with other explanatory variables to identify if non-linear relationships existed. Body weight and NEm had both linear and quadratic relationships with DMI, while the relationship with DMI for other variables was linear. The MIXED procedure of SAS with Toeplitz variance-covariance structure was used to determine the final model of DMI. After accounting for body weight and NEm in the model, two-week lag of ambient temperature and monthly lag of solar radiation interacted together (P = 0.0001), and this accounted for 0.7790 (R2) variation in DMI and improved the model fit. Therefore, these two variables and their interactions should be considered in DMI prediction equations of beef steers.

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Section: Discussionmentioning

confidence: 99%

Solar radiation and temperature as predictor variables for dry matter intake in beef steers

Yusuf¹,

Swanson²,

Hanna³

et al. 2022

Front. Anim. Sci.

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show abstract

“…Similarly, cattle orientate perpendicular to solar radiation during cool sunny days (Gonyou and Stricklin, 1981;Kennedy and Day, 1989;Olson and Wallander, 2001) because of the associated energy advantages of such thermoregulatory behaviour (Keren and Olson, 2006a, 2006b.…”

Section: Discussionmentioning

confidence: 99%

Energy advantages of orientation to solar radiation in three African ruminants

Hetem

Strauss

Heusinkveld

et al. 2011

Journal of Thermal Biology

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“…Areas experience different grazing pressure as cows regulate their temperature (seek shade, 13 gather around water sources, 14 and choose desirable plant species 15 ). Reclaimed pipelines may attract high livestock use because they are easy to walk on and have green forage with little plant litter.…”

Section: The Potential For Increased Livestock Productionmentioning

confidence: 99%

Choosing a Reclamation Seed Mix to Maintain Rangelands During Energy Development in the Bakken

Espeland

2014

Rangelands

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Thermal balance of cattle grazing winter range: Model development

Cited by 17 publications

References 32 publications

Solar radiation and temperature as predictor variables for dry matter intake in beef steers

Solar radiation and temperature as predictor variables for dry matter intake in beef steers

Energy advantages of orientation to solar radiation in three African ruminants

Choosing a Reclamation Seed Mix to Maintain Rangelands During Energy Development in the Bakken

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