caa a22 4500 397569327 CHVBK 20180308164836.0 cr unu---uuuuu 161202e199602 xx s 000 0 eng 10.3382/ps.0750197 doi (NATIONALLICENCE)oxford-10.3382/ps.0750197 Environmental Heat Stress Does Not Reduce Blood Ionized Calcium Concentration in Hens Acclimated to Elevated Temperatures [Elektronische Daten] [M. H. SAMARA, K. R. ROBBINS, M. O. SMITH] Changes in blood concentrations of ionized calcium and total calcium were measured in broiler breeder hens (42 wk old) relative to egg cycle and environmental temperatures. Two environmental temperature treatments were used: 1) temperature cycled daily from a low of 10 C at 0300 h to a high of 25 C at 1600 h; and 2) temperature cycled from a low of 21 C at 0300 h to a high of 39 C at 1600 h. Serial blood samples were collected from five laying hens per temperature treatment via cutaneous ulnar vein cannula beginning at the time of oviposition and every 4 h thereafter until the next oviposition. Neither blood concentration of ionized calcium nor total plasma calcium was affected by temperature. Results suggest that the supply of calcium available in blood for shell deposition is not diminished in hens acclimated to high environmental temperatures. © 1996 Poultry Science Association, Inc. Research Notes nationallicence broiler breeder hen nationallicence heat distress nationallicence manganese biological availability nationallicence calcium nationallicence shell nationallicence SAMARA M. H. aut ROBBINS K. R. 1To whom correspondence should be addressed. aut SMITH M. O. aut Poultry Science Oxford University Press 75/2(1996-02), 197-200 0032-5791 75:2<197 1996 75 ps https://doi.org/10.3382/ps.0750197 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3382/ps.0750197 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- SAMARA M. H. aut NATIONALLICENCE 700 1- ROBBINS K. R. 1To whom correspondence should be addressed aut NATIONALLICENCE 700 1- SMITH M. O. aut NATIONALLICENCE 773 0- Poultry Science Oxford University Press 75/2(1996-02), 197-200 0032-5791 75:2<197 1996 75 ps Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford