Effect of Feeding Levels and Physical Activities on Heat Production in Laying Hens under Different Ambient Temperatures
| Autor: | I.M. Saiful, Masanori Fujita, Toshio Ito |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2002 |
| Předmět: | |
| Zdroj: | The Journal of Poultry Science, Vol 39, Iss 2, Pp 118-125 (2002) |
| Druh dokumentu: | article |
| ISSN: | 1346-7395 1349-0486 |
| DOI: | 10.2141/jpsa.39.118 |
| Popis: | Eight Single Comb White Leghorn laying hens were used to investigate the effects of feeding levels (FL), ad libitum and 40% feeding, and physical activities on heat production (HP) under different ambient temperatures (Ta) of 25, 29 and 33°C. HP were measured by the indirect calorimetry where each hen was observed for 48 h in each condition. Activity count (ACT), standing time (STN) and eating time (ETN) were also measured for the same 48 h. ACT was measured by the Actigraph and the STN and ETN were detected by the infra-red beam switches. HP decreased with the increase of Ta and with the decrease of food intake (FI). The daily ACT decreased significantly (P |
| Databáze: | Directory of Open Access Journals |
| Externí odkaz: |
|