Agricultural and Biosystems Engineering Publications

Campus Units

Agricultural and Biosystems Engineering

Document Type

Article

Publication Version

Published Version

Publication Date

1996

Journal or Book Title

Transactions of the ASAE

Volume

39

Issue

6

First Page

2249

Last Page

2254

Abstract

The posthatch energetics of neonatal chicks exposed to a variety of environmental conditions was investigated. Specifically, moisture production (MP), sensible heat production (SHP), total heat production (THP), respiratory quotient (RQ), and body mass loss (BML) of breeder chicks during a 50 h posthatch holding period in shipping containers at the ambient temperatures of 20, 25, 30, and 35°C with the concomitant relative humidity of 40%, 30%, 22%, and 17%, respectively, were determined. The average responses of the chicks under these environmental conditions were respectively, 3.8, 4.0, 4.1, and 4.6 g·(kg·h)–1 MP; 7.8, 6.4, 5.7, and 5.2 W·kg–1 SHP; and 10.3, 9.1, 8.5, and 8.4 W·kg–1 THP. RQ was independent of the temperature (P = 0.59) and averaged 0.75. BML increased with temperature (P < 0.01) and averaged 5.3, 5.7, 5.9, and 6.3 g·chick–1, or 13.5%, 14.4%, 14.9%, and 15.9% of the initial body mass, respectively. Chick mortalities at 20°C and 25°C (1.09% and 0.71%) were higher than those at 30°C and 35°C (0.28% and 0.33%) (P < 0.01). Based on the criteria of least thermoregulatory efforts and mortality, the thermal neutrality for the unfed, group-housed neonatal chicks was between 30°C and 32°C. Moreover, the metabolic rate of the fasting chicks at thermal neutrality, 77 kcal·day–1/kg0.75 of this study agreed well with the literature value of 70 kcal·day–1/kg0.75 for fasting homeotherms. This study provides unique data for the design and operation of ventilation and environmental control systems during transportation of baby chicks.

Comments

This is Joumal Paper No. J-16736 of the Iowa Agriculture and Home Economics Experiment Station, Iowa State University, Project No. 3355. Funding for this study was provided in part by Hy-Line International. Mention of company or product names is for presentation clarity and does not imply endorsement by the authors or Iowa State University; nor exclusion of any other products that also may be suitable for the application.

This article is from Transactions of the ASAE 39, no. 6 (1996): 2249–2254.

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Open

Copyright Owner

American Society of Agricultural Engineers

Language

en

File Format

application/pdf

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