Phosphorus in the Nutrition of the Adult Hen

Singsen, E. P.; Matterson, L. D.; Tlustohowicz, J. J.; Pudelkiewicz, W. J.

doi:10.3382/ps.0480387

Cited by 8 publications

(1 citation statement)

References 10 publications

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“…Phosphorus also has an important role in the normal bone system development of broiler breeders and of embryos, as well as in egg hatchability (Harms et al, 1964;Julian, 2005). Singsen et al (1962) suggested that 0.4% available phosphorus is required for maximum hatchability of birds housed in cages. Later, Wilson et al (1980) determined that broiler breeders required 0.31% phosphorus for normal hatchability.…”

Section: Introductionmentioning

confidence: 99%

Bone mineral density of tibae and femura of broiler breeders: growth, development and production

Paz

Mendes

Quinterio

et al. 2006

Rev. Bras. Cienc. Avic.

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The aim of this study was to follow-up the physiological variations in the development of the bone tissue, associating them with the egg production curve. This study was carried out in the facilities of the Faculdade de Medicina Veterinária e Zootecnia of the UNESP, Botucatu, Brazil. Twenty-three families of Ross broiler breeders were used, each family consisting of 13 females and 1 male, distributed in 23 pens of 5.0m² each. The management was that recommended by the genetic company manual (Agroceres Ross, 2003), with daily feeding until 6th week of age; and birds were fed according to a 5:2 schedule (5 days fed, 2 days of fasting) between 7 and 17 weeks of age, returning to daily feeding starting at 18 weeks of age. Birds did not receive afternoon calcium supplementation. On the fourth week of rearing, 84 females were removed for bone analyses of the right tibia and femur, using optical densitometry in radiographic images technique. These analyses were sequentially carried out in 4, 8, 12, 15, 20, 24, 30, 35, 42, 47, and 52 week-old birds. The egg production curve of the birds was followed-up and associated to bone mineral density results. For bone mineral density evaluation (BMD) birds were divided by weight categories as light, intermediate, or heavy within each data age. BMD values of the tibias were not influenced by weight range, but by the age at collection. On the other hand, interactions were found among femur BMD values and weight and age categories. There was no correlation between eggshell quality and femur BMD. A negative correlation (-0.15) was observed between tibia BMD and eggshell percentage. It was possible to conclude that the egg production has little influence on bone mineral density of the birds probably because there was no need of bone mineral mobilization during the production period, since the observed egg production was below that observed under commercial conditions

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Section: Introductionmentioning

confidence: 99%

Bone mineral density of tibae and femura of broiler breeders: growth, development and production

Paz

Mendes

Quinterio

et al. 2006

Rev. Bras. Cienc. Avic.

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Phytates in Legumes and Cereals

Reddy

Sathe

Salunkhe

1982

Advances in Food Research

879

497

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Evaluation of the dietary interaction of calcium and phosphorus in the high producing laying hen

Hartel

1990

British Poultry Science

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1. In a 6 x 7 factorial experiment using 2688 22-week-old laying hens of the Lohmann-SL strain kept in cages (4 birds/cage), diets containing six calcium (20, 25, 30, 35, 40, 45 g calcium/kg) and seven phosphorus concentrations (3.2, 4.2, 5.2, 6.2, 7.2, 8.2, 16.2 g total phosphorus/kg (Pt)) were combined orthogonally. The resulting 42 treatments were replicated 8 times so that a replicate consisted of a double cage of 2 x 4 hens. The experiment lasted 40 weeks (10 x 28 days). 2. The experimental diets, based on maize and soyabean meals contained 11.5 MJ metabolisable energy/kg and 175 g/kg protein. Different dietary calcium and phosphorus contents were obtained by substituting oat hulls with limestone and dicalcium phosphate. 3. Mortality, egg production, egg weight, egg mass, food intake and food conversion efficiency were determined as well as the breaking strength, thickness of shells and the percentage of eggs with defective shells. 4. All responses measured were significantly influenced by the variance sources (calcium, phosphorus, interaction). Most of the production traits responded asymptotically to increasing dietary phosphorus concentration, the greatest increases or decreases generally being seen between 3.2 and 5.2 g Pt/kg. Further but weaker increases were seen between 5.2 and 8.2 or 16.2 g Pt/kg. 5. Increases in dietary calcium content always resulted in curvilinear responses. In all cases optimal effects were obtained with diets containing 25 g calcium/kg and the worst values at 45 g calcium/kg. The interaction between calcium and phosphorus was recognised by strong performance depressions and a high mortality at combinations of the lowest phosphorus concentration (3.2 g/kg) with high calcium contents (35 to 45 g/kg). These were largely offset by increasing dietary phosphorus. Thus, between 7.2 and 16.2 g Pt/kg and 25 and 45 g Ca/kg a plateau was formed where only small differences in egg production were observed. 6. From the three egg shell characteristics measured, breaking strength and shell thickness responded differently to the percentage of eggs with defective shells. While breaking strength and shell thickness were respectively negatively and positively influenced by increasing dietary phosphorus and calcium contents, both elements affected the proportion of eggs with defective shells.(ABSTRACT TRUNCATED AT 400 WORDS)

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Phosphorus in the Nutrition of the Adult Hen

Cited by 8 publications

References 10 publications

Bone mineral density of tibae and femura of broiler breeders: growth, development and production

Bone mineral density of tibae and femura of broiler breeders: growth, development and production

Phytates in Legumes and Cereals

Evaluation of the dietary interaction of calcium and phosphorus in the high producing laying hen

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