Incubation temperature manipulation during fetal development reduces adiposity of broiler hatchlings
| Autor: | Isabel Cristina Boleli, Sarah Sgavioli, D. M. C. Castiblanco, Vitor Rosa de Almeida, Viviane de Souza Morita, T. I. Vicentini |
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| Rok vydání: | 2016 |
| Předmět: |
0301 basic medicine
medicine.medical_specialty animal structures food.ingredient Chick Embryo Biology Egg Shell 03 medical and health sciences Animal science Blood serum food Yolk Internal medicine Adipocytes medicine Animals Eggshell Hatchling Incubation Adiposity Cell Proliferation Yolk Sac Temperature 0402 animal and dairy science Broiler 04 agricultural and veterinary sciences General Medicine Lipids 040201 dairy & animal science 030104 developmental biology Endocrinology embryonic structures Animal Science and Zoology Body region Adipocyte hypertrophy Chickens |
| Zdroj: | Poultry Science. 95:316-324 |
| ISSN: | 0032-5791 |
| DOI: | 10.3382/ps/pev327 |
| Popis: | Broilers are known as an efficient source of lean meat. Genetic selection resulted in broiler strains with large body size and fast growth, but a concomitant increase in fat deposition also occurred. Other than reducing nutrient intake, there is a lack of alternative methods to control body fat composition of broilers. The present study assessed whether incubation temperature (machine temperatures: 36ºC, 37.5ºC, and 39ºC; eggshell temperatures: 37.4 ± 0.08°C, 37.8 ± 0.15ºC, and 38.8 ± 0.33°C, respectively.) from d 13 affects broiler hatchling fat deposition. We analyzed adipocyte hypertrophy and proliferation in 3 body regions; weight and chemical composition of yolk-free chicks and yolk sacs; and serum lipid profile. Increased incubation temperature reduced abdominal and cervical adipocyte size. Independently of temperature, cervical adipocytes were smaller and showed higher proliferation than adipocytes in the abdominal and thigh regions. Smaller cervical adipocytes were observed in birds from eggs incubated at 36ºC and 39ºC. With regard to weight and composition of chicks, ash content as a percentage of dry matter was the only variable affected by temperature; it was higher in chicks from eggs incubated at 36ºC than at 39ºC and showed no significant difference between chicks incubated at 39ºC and 37.5ºC. Absolute and relative weights of yolk sacs were higher from eggs incubated at 39ºC than at 36ºC, and these two treatments did not differ from the 37.5ºC control. Absolute measures of yolk sac lipids, moisture, dry matter, and crude protein content were lower in chicks from eggs incubated at 36ºC, and no significant differences were found for these variables between chicks from eggs incubated at 37.5ºC and 39ºC. Hatchlings from eggs incubated at 36°C had significantly higher cholesterol levels than chicks incubated at the other 2 temperatures, but no additional effects on blood lipids were detected. Incubation temperature manipulation during fetal development altered cervical and abdominal adipocyte size in broiler hatchlings and could become a tool in hatcheries to manipulate chick quality, although further studies are needed to evaluate its long-term effects. |
| Databáze: | OpenAIRE |
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