Temperature during the last week of incubation. II. Effects on first week broiler development and performance
| Autor: | C.M. Maatjens, I. van den Anker, Bas Engel, I.A.M. van Roovert-Reijrink, H. van den Brand, Bas Kemp, C.W. van der Pol |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
Chick Embryo Broiler breeder Organ development Biology Wiskundige en Statistische Methoden - Biometris 03 medical and health sciences Egg Shell Animal science Animals Adaptatiefysiologie Eggshell Mathematical and Statistical Methods - Biometris Incubation Heart weight 0402 animal and dairy science Broiler Temperature temperature 04 agricultural and veterinary sciences General Medicine Anatomy incubation 040201 dairy & animal science 030104 developmental biology organ development WIAS Adaptation Physiology Animal Science and Zoology Flock broiler performance Chickens |
| Zdroj: | Poultry Science, 95(9), 2136-2144 Poultry Science 95 (2016) 9 |
| ISSN: | 1525-3171 0032-5791 |
| Popis: | Little is known about applying various eggshell temperatures (EST) during the last week of incubation. In particular, the effect of an EST below 37.8°C during the last week of incubation is poorly investigated. Therefore, we investigated effects of EST of 35.6, 36.7, 37.8, or 38.9°C applied from d of incubation (E) 15, E17, or E19 on first week broiler development and performance. A total of 2,850 first grade eggs of a 43 wk old Ross 308 broiler breeder flock were incubated at an EST of 37.8°C until E15. From E15, E17, or E19 onward, eggs were incubated at an EST of 35.6, 36.7, 37.8, or 38.9°C. Chick quality was determined at placement in the broiler house and organ development was measured at d 7. BW was determined at placement, d4, and d7. Feed intake (FI) was measured at d4 and d7 and G:F was calculated between placement and d4, and between d4 and d7. Chick quality at placement was higher at an EST of 35.6°C compared to all other EST treatments, expressed by a longer chick length and highest prevalence of closed navels. BW d 7 was higher at an EST of 36.7°C compared to all other EST treatments, which was not caused by a higher FI during the first week. A higher G:F between d 0 and d 7 was found at an EST of 36.7°C compared to 35.6 and 38.9°C. At d 7, a higher relative heart weight was found at an EST of 35.6 compared to 38.9°C. This study indicates that an EST of 38.9°C applied from E15 onward negatively affected chick quality, organ development, and G:F until d 7 compared to 37.8°C. Moreover, an EST of 36.7°C had a clear positive effect on chick quality, organ development, G:F, and growth performance until d 7. An EST of 35.6°C resulted in equal or higher chick quality and organ weights compared to 36.7°C, but this was not reflected in performance parameters. |
| Databáze: | OpenAIRE |
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