Incubation and hatch management: consequences for bone mineralization in Cobb 500 meat chickens
| Autor: | Peter J. Groves, W. I. Muir |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
chicks Veterinary medicine leg strength animal structures Chick Embryo Biology broiler SF1-1100 Mineralization (biology) Incubation period 03 medical and health sciences chemistry.chemical_compound Calcification Physiologic Bone Density Animals Eggshell Animal Husbandry Incubation Hatching chick take-off 0402 animal and dairy science Broiler Temperature hatch window 04 agricultural and veterinary sciences 040201 dairy & animal science Animal culture 030104 developmental biology Bone ash chemistry embryonic structures Femoral bone Animal Science and Zoology Chickens |
| Zdroj: | Animal, Vol 12, Iss 4, Pp 794-801 (2018) |
| ISSN: | 1751-732X |
| Popis: | From ~35 days of age fast growing meat chickens spend extended periods sitting or lying and less time standing. In a fast-feathering parent line lower early incubation temperatures which delayed chick hatch time, improved bone ash and extended their standing time. This incubation study assessed the consequences of incubation temperatures, hatch time and chick management at hatch/take off on femoral bone ash (BA) in Cobb 500 meat chickens. Embryos were incubated under either Control (between 37.8°C and 38.2°C egg shell temperature (EST)) or a Slow start (from 37.2°C at sett (the start of incubation), reaching 37.8°C EST at day 13 incubation), temperatures. Hatched chicks were identified at 492 h (20.5 days of incubation – classified as early (E)) or, between >492 and ⩽516 h (>20.5 and ⩽21.5 days of incubation – classified as late (L)), from setting. The E hatch chicks were allocated across three post-hatch treatments; treatment 1: E hatch chicks that were sampled E at 492 h from setting; treatment 2: E hatch chicks that were fed for a further 24 h in a floorpen before being sampled L at 516 h from setting; treatment 3: E hatch chicks that spent a further 24 h in the incubator before being sampled L at 516 h from setting. All L hatch chicks formed one treatment group which was sampled L at 516 h (i.e. L hatch chicks sampled L). It is not possible to sample L hatching chicks E hence this treatment is absent from the experimental design. Slow start incubation resulted in a higher total hatch percentage with a greater proportion of chicks hatching L, compared with the Control incubation. The L hatching chicks had significantly higher BA than the E hatching chicks. Of the E hatching chicks, those sampled both E and L had significantly lower BA than E hatching chicks fed for 24 h before L sampling. The E hatch, fed and sampled L chicks had the numerically highest BA, which was not significantly different from the BA of the L hatching chicks sampled L These results demonstrate that BA at hatch can be improved, either by extending the incubation period through a Slow start incubation profile, inducing L hatch, or alternatively, via the prompt provision of feed to E hatching chicks. |
| Databáze: | OpenAIRE |
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