DASC20010 Lecture Notes - Lecture 32: Thermal Comfort, Alkalosis, Exhalation
23 Jul 2018
School
Department
Course
Professor
Document Summary
Metabolic rate increases in some processes when hyper but mainly it drops. Thermal comfort depends on species, size, lactation, habitat, fatness. In 2015 the co21 was signed to limit global temp below 2 degrees to stop climate change. More consumption of animals cos more people in urban settings. Different feed items release diff amounts of heat or are digested more slowly, reducing heat stress. Sows produce less milk when hotter cos production increases metabolic heat. Evaporative cooling sweat (eccrine for ther(cid:373)oregulatio(cid:374) (cid:374)ot apocri(cid:374)e, pig sweat gla(cid:374)ds do(cid:374) t respo(cid:374)d to heat), Pant (increases co2 exhalation which changes ph)- increases respir rate, decreases tidal v- to reduce amount of co2 exhaled and reduce alkalosis. With increased temp too high gut is under oxidative stress and villi are damaged so can get leaky gut (bad digestion, absorption and provides portal for pathogens) Retain- vasoconstrict, insulation (big sa, fur, fat, feathers), countercurrent heat exchange.
