Frost T J, Roland D A
Poultry Science Department, Auburn University, Alabama 36849.
Poult Sci. 1991 Apr;70(4):963-9. doi: 10.3382/ps.0700963.
One thousand and eighty DeKalb XL pullets were randomly allocated to nine treatments and arranged in a 3 x 3 factorial to determine the effects of three levels of dietary calcium (2.75, 3.75, and 4.25%) and three levels of dietary available phosphorus (.30, .40, and .50%) on eggshell quality and tibia weight, tibia breaking strength, tibia ash, and bone mineral content of pullets during peak production. Feed consumption increased as dietary calcium or phosphorus increased. Increasing dietary calcium caused a significant linear increase in egg specific gravity, but dietary phosphorus had no significant effect on egg specific gravity. Calcium and phosphorus levels did not significantly affect egg production, body weight, plasma chloride, or phosphorus. Ionized calcium increased significantly as dietary calcium increased. Tibia breaking strength, tibia weight, tibia ash, and bone mineral content increased significantly with increasing dietary calcium. Dietary phosphorus had no significant effect on these parameters. However, when 2.75% calcium was fed, reducing dietary phosphorus significantly decreased tibia weight, tibia ash, and bone mineral content.
1080只迪卡白洛克小母鸡被随机分配到9种处理组中，并按照3×3析因设计进行排列，以确定三种日粮钙水平（2.75%、3.75%和4.25%）和三种日粮有效磷水平（0.30%、0.40%和0.50%）对产蛋高峰期小母鸡蛋壳质量、胫骨重量、胫骨断裂强度、胫骨灰分和骨矿物质含量的影响。随着日粮钙或磷水平的增加，采食量增加。日粮钙增加导致蛋比重显著线性增加，但日粮磷对蛋比重无显著影响。钙和磷水平对产蛋量、体重、血浆氯离子或磷无显著影响。随着日粮钙增加，离子钙显著增加。随着日粮钙增加，胫骨断裂强度、胫骨重量、胫骨灰分和骨矿物质含量显著增加。日粮磷对这些参数无显著影响。然而，当饲喂2.75%钙时，降低日粮磷显著降低胫骨重量、胫骨灰分和骨矿物质含量。
