caa a22 4500 397567545 CHVBK 20180308164832.0 cr unu---uuuuu 161202e199607 xx s 000 0 eng 10.3382/ps.0750838 doi (NATIONALLICENCE)oxford-10.3382/ps.0750838 LOKHORST C. DLO-Institute of Agricultural and Environmental Engineering, P.O. Box 43, 6700 AA Wageningen, The Netherlands Mathematical Curves for the Description of Input and Output Variables of the Daily Production Process in Aviary Housing Systems for Laying Hens [Elektronische Daten] [C. LOKHORST] The objectives of this study were 1) to compute appropriate mathematical curves that describe the daily production process by the input variables daily feed consumption, water consumption, ambient temperature, and output variables hen-day egg production, egg weight, second grade eggs, floor eggs, cumulative mortality, body weight, and flock uniformity; and 2) to obtain insights into the daily variations in these variables, in order to support the poultry farmer with an aviary housing system in his daily management. Literature and research data attainted from six unmolted flocks that were housed in aviary systems were used to formulate the mathematical curves. The curves were a function of the number of days in the laying period. Curves for cumulative mortality, hen-day egg production, egg weight, body weight, and percentage of floor eggs described individual flock results well (0.72 < R2 adj < 1.00). The coefficients of determination for feed consumption, water consumption, flock uniformity, and percentage of second grade eggs were in general low (0.33 < R2 adj < 0.54), which implies that the form of the curve differs between flocks. Egg weight, body weight, cumulative mortality, and hen-day egg production had the lowest minimum coefficients of variation (0.8 to 1.9), followed by feed consumption, water consumption, and flock uniformity (2.8 to 3.6). Ambient temperature, percentage floor eggs, and percentage of second grade eggs had the highest minimum coefficients of variation (4.8 to 9.1). © 1996 Poultry Science Association, Inc. Education and Production nationallicence mathematical curve nationallicence egg production nationallicence aviary system nationallicence laying hen nationallicence variability nationallicence Poultry Science Oxford University Press 75/7(1996-07), 838-848 0032-5791 75:7<838 1996 75 ps https://doi.org/10.3382/ps.0750838 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3382/ps.0750838 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- LOKHORST C. DLO-Institute of Agricultural and Environmental Engineering, P.O. Box 43, 6700 AA Wageningen, The Netherlands NATIONALLICENCE 773 0- Poultry Science Oxford University Press 75/7(1996-07), 838-848 0032-5791 75:7<838 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