Abstract Industrial egg residue (IER) possesses substantial concentrations of calcium and crude protein. The objective of this study was to measure the digestibility and performance of broilers when IER was added to the feed. Four treatments were tested, which caused increasing replacement of calcitic limestone by IER (0, 35, 70 and 100%) during a 42-day production cycle. First, total bird excreta were collected from broilers with and without IER, and we determined dry matter digestibility, apparent metabolizable energy (AME), calcium, and nitrogen retention. The IER presented 7.5% of crude protein, 31% of calcium, 209 kcal/kg of AME and the digestibility coefficients for dry matter, crude protein, and calcium were calculated at 83.95%, 86.20%, and 67%, respectively. After the digestibility test, the effects of IER on performance, carcass and meat yield were evaluated. No significant differences between the treatments were found in terms of performance (weight gain, feed conversion, consumption, and mortality), and no differences were found in terms of carcass or meat yield. A linear decrease in the percentage of abdominal fat was observed with increasing inclusion of IER in feed. These findings suggest that IER can totally replace limestone (calcium carbonate) in broiler diets. (IER protein tested 0, 0 (0 35 7 100% 100 42day day 42 cycle First AME, , (AME) retention 75 5 7.5 31 20 kcalkg kcal kg 8395 83 95 83.95% 8620 86 86.20% 67 67% respectively test evaluated weight gain conversion consumption mortality, mortality mortality) carbonate diets ( 3 10 4 (AME 7. 2 839 8 9 83.95 862 86.20 6 1 83.9 86.2 83. 86.

Abstract Our objective was to determine whether inclusion of industrial egg residue (IER) in the diets of laying hens would replace calcitic limestone without interfering with productive efficiency, egg quality or digestibility. In a first study (Experiment I), we used 30% IER in the diets of laying hens and found that the apparent digestibility coefficients were 51.6%, 42.8%, 51.6% and 17.8% for dry matter, crude protein, calcium and phosphorus, respectively. In the second study (Experiment II), we compared a control diet containing calcitic limestone with four diets containing increasing levels of IER, in proportions of 25%, 50%, 75% and 100%. During the first cycle (day 1–28), there was no difference between treatments in terms of productive performance or egg quality. During the second production cycle (day 29–56), we observed less food consumption by birds that ingested the highest levels of IER (100% substitution) than in controls. During the third cycle (day 57–84), we found that the inclusion of IER negatively affected performance, particularly lower production numbers, lower egg mass and higher feed conversion. Finally, during the third cycle, chickens broke and ingested their eggs shortly after laying. We conclude that the use of industrial egg residue cannot replace limestone in the feed of commercial laying hens, because it reduces performance and affects egg quality.

Abstract Abstract: This study evaluated the effect of oregano essential oil added to the feed of commercial laying hens. This research was focused on the analysis of biochemical changes linked to hepatic function, and protein and lipid metabolism. It was used 240 laying hens (59 weeks-old) distributed in a completely randomized design of six treatments (five repetitions with eight birds each). The experiments were constituted by a control treatment (CT) with the inclusion of zinc bacitracin and five treatments of oregano essential oil (OEO: 0, 50, 100, 150, and 200 mg.kg-1), respectively. After 28 days of feeding, an increase on serum levels of total proteins and globulins was observed on groups T150 and T200, as well as an increase on albumin levels on group CT. After 84 days of feeding, a significant reduction on total proteins and albumin was observed on group T200, as well as an increase in serum triglycerides. OEO at 200 mg.kg-1 increased globulin levels on day 28, which may be considered an effect in the inflammatory response, which increases serum immunoglobulins and proteins.

RESUMO As aves possuem baixo aproveitamento do fósforo fítico das dietas, devido à falta de enzimas endógenas que consigam realizar a quebra e aproveitamento do mesmo. Objetivou-se no presente estudo avaliar a adição de fitase em dietas de codornas poedeiras. Foram utilizadas 80codornas, em delineamento experimental inteiramente casualizado composto por cinco tratamentos e quatro repetições, de quatro aves cada. Os tratamentos foram: 0,35% Pd; 0,20% Pd; 0,20% Pd + 500FTUs de fitase; 0,09% Pd; 0,09% Pd + 500 FTUs de fitase. As aves foram alojadas em baterias metálicas, em período experimental de 21 dias, para avaliação da produção de ovos, peso dos ovos, consumo de ração e conversão alimentar. Após coletados, os ovos foram encaminhados ao laboratório de nutrição do departamento de zootecnia do CEO/Udesc, onde foram realizadas as análises de qualidade de albúmen, de clara e casca. Os resultados obtidos foramsubmetidos à análise de variância e as diferenças entre as médias foram comparadas pelo teste de Tukey a 5% de significância. Não foram observadas diferenças (P>0,05) nos parâmetros de desempenho e qualidade de ovos avaliados. Conclui-se que a inclusão da fitase na dieta de codornas poedeiras pode ser empregada sem causar comprometimento do desempenho e qualidade dos ovos das aves. Adicionalmente, 0,09% de fósforo disponível pode ser utilizado, garantindo o desempenho em período de 21 dias de produção.

SUMMARY Birds show poor utilization of phytic phosphorus in their diets because of the lack of endogenous enzymes to digest phosphorus and make it bioavailable. Therefore, the objective of this study was to evaluate phytase supplementation in the diets of laying quails. Eighty quails were used in a completely randomized experimental design with five treatments and four replicates of four birds each. The treatments were as follows: 0.35% Pd; 0.20% Pd; 0.20% Pd + 500FTUs of phytase; 0.09% Pd; 0.09% Pd + 500 FTUs of phytase. The birds were housed in metallic batteries during a trial period of 21 days, for evaluation of egg production, egg weight, feed intake and feed conversion. After being collected, the eggs were sent to the nutrition laboratory of the department of zootechnics of the CEO/Udesc, where analyses of albumin, yolk and shell quality were performed. The results were subjected to analysis of variance, and the differences between the averages were compared using the Tukey test at 5% of significance. No differences (P> 0.05) were observed in terms of performance and egg quality parameters. We conclude that the inclusion of phytase in the diet of laying quails can be accomplished without compromising the performance and quality of the eggs. Additionally, 0.09% of 22 disponible phosphorus can be used to grant adequate performance for 21 days.