Banca de DEFESA: GLEYCE LOPES DA COSTA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : GLEYCE LOPES DA COSTA
DATE: 16/11/2021
TIME: 13:00
LOCAL: INSTITUTO DE ZOOTECNIA
TITLE:

True ileal digestibility of dicalcium phosphate phosphorus in broiler diets

KEY WORDS:

Digestible phosphorus, phosphorus sources, regression.

 

PAGES: 47
BIG AREA: Ciências Agrárias
AREA: Zootecnia
SUMMARY:

COSTA, Gleyce Lopes da. True ileal digestibility of dicalcium phosphate phosphorus in broiler diets. 2021. 50 f. Dissertation (Master in Zootechnics). Animal Science Institute, Federal Rural University of Rio de Janeiro, Seropédica, RJ, 2021. It is likely that the digestibility varies depending on the mineral ingredient origin and its chemical structure, particle size and solubility, thus, the objective of this work was to determine the ileal phosphorus digestibility of three dicalcium phosphates in broiler diets by the regression method. To determine the true ileal digestibility coefficients of phosphorus (DIvP) a metabolism assay was carried out with collection of ileal content. The experimental design was completely randomized, in a 3 x 2 +1 factorial scheme, with 3 ingredients (phosphate 1, phosphate 2 and phosphate 3) and 2 inclusion values, and 1 basal diet, with 6 replicates per treatment and 6 birds per unit experimental, totaling 252 birds. Six diets based on corn and soybean meal were formulated with gradual inclusion of test ingredients. Each component test has two inclusion values 0.075 and 0.15% to reach increasing levels of P. In the regression method, the 2 levels of inclusion for each test ingredient plus the result of the basal diet, which will have 0 inclusion of ingredients, are used. test. Titanium dioxide was added to the experimental rations at 0.5%, as an indigestible indicator. The birds were placed in metabolism cages at 15 days of age, being fed from the 17th day on, with the experimental diets. On the 22nd day of life, all birds were slaughtered for later collection of ileal content. The apparent ileal digestibility coefficients of phosphorus in the experimental diets ranged from 48.9 to 54.3%. No relevant interactions were found between the phosphorus level and the source used for the apparent ileal phosphorus digestibility coefficients (P> 0.05). The apparent ileal digestibility of phosphorus was not affected by phosphorus level (P>0.05), but rather by phosphorus sources (P<0.05). The diet with dicalcium phosphate 2 (FB2) had the highest P digestibility, while the diet with FB3 had intermediate digestibility and the diet with FB1 had the lowest digestibility (P <0.05). The true ileal phosphorus digestibility of the phosphates FB1, FB2 and FB3 was provided at 36.39, 48.97 and 35.53% respectively. The final P losses for FB1, FB2 and B3 were 0.66, 0.27 and 0.76 (g / KgMSi) respectively. The highest digestibility found in the present study was that of dicalcium phosphate 2 (FB2) 48.97%. Although no significant differences were found when comparing the digestibility of the different phosphates themselves, FB2 was the one that generated the best digestibility of this phosphate, when compared to FB1 and FB3. A comparison of the regression coefficient of the dicalcium phosphates used by the analysis of covariance did not find significant differences between the phosphorus digestibility of the phosphates used (P>0.05) used. Therefore, it can be stated that the steep slope coefficients of the straight line are equal among the phosphates. A strong linear relationship between the digestible phosphorus content and the total phosphorus content of the diet indicates that the regression method can be used to estimate the true phosphorus digestibility of dicalcium phosphate (R2 = 0.9614, 0.9928 and 0, 9114. Comparison of the results with the sources of P studied here and the literature values updated that methodological details, Ca:P ratio and influence of basal diet can have a large effect on P digestibility, requiring further standardization of P protocol to achieve better comparability of results.The results show that a representative value of phosphorus digestibility of different dicalcium phosphates can be used.

 

 

 

BANKING MEMBERS:
Externa à Instituição - CHRISTIANE SILVA SOUZA - UFRRJ
Presidente - 387738 - CRISTINA AMORIM RIBEIRO DE LIMA
Externo à Instituição - FLÁVIO MEDEIROS VIEITES - UFJF