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

作者：Mustapha Yusuf, Kendall C Swanson, Lauren L Hulsman Hanna, Ronald Degges, M. L. Bauer · 发表于：Frontiers in Animal Science · 年份：2022 · DOI：10.3389/fanim.2022.975093 · 被引用次数：3 · 研究领域：Effects of Environmental Stressors on Livestock、Agriculture Sustainability and Environmental Impact、Climate Change and Health Impacts

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 (NE m ; 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/m 2 ), two-week lag of solar radiation (34.6 to 272 W/m 2 ) and monthly lag of solar radiation (43.7 to 256.6 W/m 2 ). 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 NE m 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 NE m in ...