Effects of the Level and Relationship of Calcium and Available Phosphorus on the Growth and Tibia Mineralization of Broiler Starter Chickens
Por:
Diaz-Alonso, J. A., Gomez-Rosales, S., Angeles, M. de L., Avila-Gonzalez, E., Lopez-Coello, C.
Publicada:
1 jun 2019
Categoría:
Animal science and zoology
Resumen:
The objective of this research was to evaluate the growth performance
and tibia measurements in broilers from 8 to 21 d of age fed diets with
increasing levels of aP at adjusted or variable levels of Ca. A total of
168 chicks from 8 to 19 d of age were allocated in pairs per cage and
randomly assigned to 6 dietary levels of aP (0.13%, 0.23%, 0.33%,
0.43%, 0.53%, and 0.63%) and 2 Ca: aP ratios, adjusted (adjCa:aP) or
variable (varCa:aP). In the AdjCa diets, the Ca:aP ratio was kept at 2:
1; in the varCa diets the Ca:aP ratio varied from 7.69 to 1.59. Chicks
were weighed at the beginning and end of the experiment. At the last day
of the trial, all chicks were killed to determine the tibia ash and Ca
and P content in the ash. Data was subjected to ANOVA and linear
regression analysis. In broilers fed the adjCa:aP diets, the maximum WG,
weight of tibia ash, and weight of P in tibia ash (P < 0.01) were
observed at aP levels of 0.40%, 0.52%, and 0.53% aP, and at aP levels
of 0.63%, 0.62%, and 0.59% in broilers fed the varCa:aP diets.
Broilers fed the adjCa:aP ratio diets had higher (P < 0.01) aP intake,
aP intake per g of WG, tibia ash percentage, weight of Ca, and
percentage P in tibia ash, but lower feed conversion ratio compared to
broilers fed the varCa:aP ratio diets. Regardless of the dietary Ca:aP
ratios, the maximum tibia ash percentage (P < 0.01), weight of Ca in
tibia (P < 0.01) and percentage of P in tibia (P < 0.05) were estimated
at 0.59%, 0.62%, and 0.57% aP. The maximum WG, weight of ash, and Ca
and P on tibia ash were reached in broilers fed diets with an aP level
of 0.53% and Ca:aP ratio of 2: 1 and in those fed diets with an aP
level of 0.63% and Ca:aP ratio of 1.59.
Filiaciones:
Diaz-Alonso, J. A.:
Univ Nacl Autonoma Mexico, Fac Higher Studies Cuautitlan, Postgrad & Res Dept, Ajuchitlan 76280, Queretaro, Mexico
Vimifos SA CV, Phosphates & Nutr Technol Dept, El Salto 45680, Jalisco, Mexico
Postgraduate and Research Department, Faculty of Higher Studies Cuautitlán, National Autonomous University of Mexico, Ajuchitlán, Querétaro 76280, Mexico
Phosphates and Nutritional Technologies Department, Vimifos S.A. de C.V., El Salto, Jalisco, 45680, Mexico
Gomez-Rosales, S.:
Univ Nacl Autonoma Mexico, Fac Higher Studies Cuautitlan, Postgrad & Res Dept, Ajuchitlan 76280, Queretaro, Mexico
Natl Inst Res Forestry Agr & Livestock, Natl Ctr Disciplinary Res Anim Physiol, Dept Anim Nutr, Ajuchitlan 76280, Queretaro, Mexico
Postgraduate and Research Department, Faculty of Higher Studies Cuautitlán, National Autonomous University of Mexico, Ajuchitlán, Querétaro 76280, Mexico
Department of Animal Nutrition, National Center of Disciplinary Research in Animal Physiology, National Institute of Research in Forestry, Agriculture and Livestock, Ajuchitlán, Querétaro 76280, Mexico
Angeles, M. de L.:
Natl Inst Res Forestry Agr & Livestock, Natl Ctr Disciplinary Res Anim Physiol, Dept Anim Nutr, Ajuchitlan 76280, Queretaro, Mexico
Department of Animal Nutrition, National Center of Disciplinary Research in Animal Physiology, National Institute of Research in Forestry, Agriculture and Livestock, Ajuchitlán, Querétaro 76280, Mexico
Avila-Gonzalez, E.:
Univ Nacl Autonoma Mexico, Poultry Sci Dept, Mexico City 04510, DF, Mexico
Poultry Science Department, University City, National Autonomous University of Mexico, México D.F. 04510, Mexico
Lopez-Coello, C.:
Univ Nacl Autonoma Mexico, Poultry Sci Dept, Mexico City 04510, DF, Mexico
Poultry Science Department, University City, National Autonomous University of Mexico, México D.F. 04510, Mexico
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