Effect of Different Levels of Dietary Protein and Energy on the Growth and Slaughter Performance at „Hybro PN+” Broiler Chickens

Adela Marcu, Ioan Vacaru-Opriş, Adrian Marcu, Marioara Nicula, Dorel Dronca, Bartolomeu Kelciov

Abstract


In this paper was studied effect of different level of dietary energy and protein on the growth performance (averagedaily gain, feed conversion), slaughter yield and participation quota of the cut parts from the whole carcassesstructure at „Hybro PN+” hybrid, slaughtered at 42 days old. The two groups (control group-Lc and experimentalgroup-Lexp) have received compound feed with different levels of energy and protein. Chickens were weighed at: 1,7, 14, 21, 28, 35 and 42 days. After slaughter, from each group were sampled 30 carcasses and were determinedcarcass characteristics using gravimetric measurements. At 42 days, the Lexp group has recorded higher values forthe body weight (+7.83%) and average daily gain (+8.70%), compared with the Lc group. This performance has beenachieved through an average individual feed intake of 4.162 kg, at Lc and 4.227 kg, at Lexp, meaning a value of1.701 kg feed/kg gain, at Lexp group and 1.806 kg feed/kg gain, at Lc group. For slaughter yield at fresh carcassesresulted values from 77.22% (Lc) up to 78.21% (Lexp), at female chickens and from 78.55% (Lc) up to 79.12%(Lexp), at male chickens. After refrigeration, the values for this characteristic were decreased by 1.80 up to 1.89%.Participation quota of the cut parts from the whole carcasses structure has registered the highest values in Lexp groupfor breast and drumsticks, compared with Lc group. At the Lexp group, high levels of dietary protein and energy hassignificantly influenced: average daily gain, feed conversion ratio, slaughter yield and the participation quota of thecut parts from the whole carcasses structure (breast and drumsticks).

Keywords


Hybro PN+ hybrid; broiler chickens; average daily gain; feed conversion index; slaughter yield

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LUCRARI STIINTIFICE ZOOTEHNIE SI BIOTEHNOLOGII (SCIENTIFIC PAPERS ANIMAL SCIENCE AND BIOTECHNOLOGIES)

ISSN print 1841 - 9364
ISSN online 2344 - 4576
ISSN-L  1841 - 9364
(former ISSN 1221-5287, E-ISSN 1841-9364)

PUBLISHER: AGROPRINT Timisoara, Romania
PAPER ACCESS: Full text articles available for free
FREQUENCY: Semiannual
PUBLICATION LANGUAGE: English
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Banat´s University of Agricultural Sciences and Veterinary Medicine "King Michael I of Romania" from Timisoara
Faculty of Animal Science and Biotechnologies
300645, Timişoara, Calea Aradului 119, Romania

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