The Effects of High Environmental Temperature Induced Acid-Base Disturbance on The Utilization of Calcium by The Domestic Hen

The effects of an acute heat stress (35(DEGREES)C) on respiratory rate, blood pH, blood PCO(,2) and blood HCO(,3)('-) concentration was investigated in SCWL hens. Within one hour after initiation of heat challenge, respiratory rate was significantly (P < .01) elevated which led to blood alkalosis from a reduction (P < .01) in blood PCO(,2). These trends continued for an additional hour when blood pH began declining. Following the heat stress period, blood pH was reduced from initial pH but not significantly. During this time blood PCO(,2) remained low while HCO(,3)('-) concentration dropped 50 percent. Accompanying this pH and HCO(,3)('-) drop was an increase (P < .01) in blood lactate and pyruvate. This suggests that the buffering of these organic acids by blood HCO(,3)('-) brought the blood {HCO(,3)('-)}/{H(,2)CO(,3)} ratio back toward 20:1 by reducing blood HCO(,3)('-) concentration. As a result blood pH was lowered.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Animal Sciences

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2014

Author dc:creator

• Odom, Ted William

• Agriculture, Animal Culture and Nutrition

Identifier

(UMI)AAI8218533

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/69996