Impact of Different Levels of Crude Protein on Production Performance and Meat Quality in Broiler Selected for Slow Growth
2023
Marius Giorgi Usturoi | Răzvan-Mihail Radu-Rusu | Alexandru Usturoi | Cristina Simeanu | Marius Gheorghe Doliș | Roxana Nicoleta Rațu | Daniel Simeanu
The production performance and meat quality of the slow-growing hybrid Hubbard JA757 were monitored under conditions of diets differentiated by crude protein content. A total of 1200 as-hatched day-old chickens were equally and randomly allotted into two treatments (T-1 and T-2), with six replicates provided for each treatment (100 chickens/replicate). T-1 chickens received standard diets (according to Hubbard Company recommendations), and those in T-2 were fed diets supplemented with crude protein (+0.5% CP in the growing phase and +1.0% CP in the finishing phase). At the end of the investigations (age 56 days), the T-2 chickens performed better than the T-1 chickens for growth traits (+2.72% body weight: +2.77% daily growth gain: &minus:0.34% mortality: and &minus:4.15% feed conversion ratio): for slaughtering (+0.66% dressed yield: +1.10% breast weight: and +1.25% thigh weight): and for quality meat (+0.55% dry matter in thigh muscles and +1.52% dry matter in breast muscles) (p >: 0.05). Statistically significant differences (p :<: 0.05) occurred between treatments for body weight, daily weight gain, and feed conversion ratio due to the 0.5% CP feed supplementation during the 15&ndash:28 day age period, justifying the usefulness of the CP increasing throughout the grower diet only and not during the finishing period.
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