Abstract
It was intended to evaluate the supplementation of Lafoensia pacari standardized in tannins extract in the diet of laying hens on the performance, internal and external quality of eggs and metabolism of the feed nutrients. A total of 168 Isa Brown laying hens, aged 24 weeks, with the mean weight of 2.6 kg and the mean posture rate of 87% were used during 4 periods of 28 days each. The treatments consisted of Halquinol performance-enhancing antibiotic, Mannanoligosaccharide (MOS) prebiotic and three levels of pacari extract – 1,000, 2,000 and 3,000 mg kg-1of feed. The experimental design was completely randomized, with six treatments and seven replicates of four hens each. The pacari standardized in tannin extract presented a percentage of albumen and an egg weight similar to the antibiotic (p < 0.04). The supplementation with the extract improved the shell quality, verified by the specific gravity (p < 0.03) and promoted the metabolizability of ether extract similar to antibiotic and MOS (p < 0.04), allowing its indication as a phytogenic additive.
Highlights
The inclusion of performance-enhancing antibiotics (PEA) in animal feed is an important factor in the aviaryposture production, its probable induction to bacterial resistance has influenced the restriction of their use
The pacari (Lafoensia pacari), which is native from the Brazilian cerrado, has bioactive compounds such as steroids, flavonoids, tannins and alkaloids (Santos, Coelho, & Pirani, 2009), with antimutagenic actions (Kaur, Grover, & Kumar, 1997), antimicrobial (Lima et al, 2006; Porfírio, MeloFilho, Alvino, Lima, & Sant'ana, 2009), anti-inflammatory, antioxidant (Solon, Lopes, Sousa Júnior, & Schmeda-Hirschmann, 2000) and antifungal agents (Lima et al, 2006, Porfírio, MeloFilho, Alvino, Lima, & Sant'ana, 2009)
The experimental design was completely randomized, with six treatments and seven replicates of four laying hens each, and consisted of: (T1) control feedwith antibiotic performance improver Halquinol, (T2) control feed with MOS prebiotic, (T3) control feed without additives, (T4) control feed with 1,000 mg kg-1 of pacariextract (T5) control feed with 2,000 mg kg-1 of pacari extract and (T6) control feed with 3,000 mg kg-1 of pacari extract
Summary
The inclusion of performance-enhancing antibiotics (PEA) in animal feed is an important factor in the aviaryposture production, its probable induction to bacterial resistance has influenced the restriction of their use. Phytogenic additives are included in animal feed as extracts or oils. They have been studied as performance enhancers because they present uses such as the reduction of the growth of pathogenic. This study was carried out with the purpose of evaluating the effects of feed supplemented with standardized pacari extract in tannin content on performance, internal and external egg quality and nutrient digestibility of commercial laying hens
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