The effect of day length on broiler breeders' performance at suboptimal females' weight

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43210%2F16%3A00091918" target="_blank" >RIV/62156489:43210/16:00091918 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

The effect of day length on broiler breeders' performance at suboptimal females' weight

Original language description

The aim of the study was to compare 13 h and 14 h day lengths on broiler breeders' performance, while the females had suboptimal body weight at the time of mixing males and females (19 weeks). Two houses on the same farm with the same hybrid combination, technologies and with the same age of the flock were used in this experiment. Approximately 5,400 females were housed in each flock. At 19th week of age the average female weight in both flocks was 234 g lower than the recommendation for this hybrid is in this age. Daily feed intake was increased in both flocks to rich the final body weight, however the live body weight was lower till 21st week of age. At the age of 155 days the day length was firstly prolonged from 8 h to 11 h and consequently the day length was prolonged till day 186. From this age 13 h day length was used in one flock and 14h in the second one. Hatching eggs weight from 28th to 35th weeks of age was significantly lower (P < 0.05) in flock with 14 h day length in comparison with the flock with 13 h day length (61.9 g vs 60.8 g). Between eggs weight from 28th to 57th weeks of age there was no significant difference (P > 0.05). There was no significant (P > 0.05) difference between the flocks in laying intensity, flock uniformity, proportion of double yolk eggs or hatching eggs. The day length 13 h is sufficient for broiler breeders. Longer lay length can have negative effect on hatching eggs weight at the beginning of laying period in flock with suboptimal body weight at time of mixing males and females.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

GG - Zootechnics

OECD FORD branch

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Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů