Interactions of climatic factors affecting milk yield and composition.

摘要: Abstract Objectives were to evaluate effects of interactions maximum temperature, minimum relative humidity, and solar radiation on milk yield constituent traits. Effects climate variables their significant but small in most cases. Second order regression models developed for several variables. Six examined detail: Holstein Jersey yields, fat Feulgen-DNA reflectance percent, protein percent yield. Maximum temperature had greatest influence each response, followed by humidity radiation. Optimum conditions production at temperatures below 19.4°C, increasing radiation, between 33.4 78.2% (cool sunny days, moderate humidity). 3.5% was predicted 30.8°C, 89%, 109 Langleys; actual mean 3.35%. climatic 10.6°C with 300 Langleys 16% low Because noteworthy existed effects, response surface methodology suitable determining optimum production.