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Abstract
This study examined the effects of various levels of dietary nonphytate phosphorus on laying performance and the expression patterns of phosphorus metabolism related genes in Dwarf pink-shell laying hens. A total of 405 28-week-old Dwarf pink-shell laying hens were fed the same corn-soybean basal meals but containing 0.20%, 0.25%, 0.30%, 0.35% or 0.40% nonphytate phosphorus. The results showed that feed intake, egg production, and average egg weights were quadratically correlated with dietary nonphytate phosphorus content (P < 0.05), and the highest egg production, feed intake and average egg weights were achieved when dietary nonphytate phosphorus was at 0.3% (P < 0.05). mRNA expression of intestinal sodium phosphorus co-transporter linearly decreased when dietary nonphytate phosphorus increased. mRNA and protein expression of intestinal calbindin and vitamin D receptor correlated quadratically with dietary nonphytate phosphorus, and the highest expression was found when dietary available phosphorus was at 0.25% to 0.3%. In conclusion, the ideal phosphorus requirement for Dwarf pink-shell layer hens is estimated to be 0.3% in a corn-soybean diet. With this level of phosphorus supplementation, calbindin and vitamin D receptor reached their highest expression.
Highlights
Phosphorus is an essential nutrient for animals
The highest average egg weight, hen-day egg production and feed intake were predicted to be obtained at the nonphytate phosphorus level of 0.3% based on quadratic relationships with dietary nonphytate phosphorus content (P < 0.05)
Summers [18] showed that layers fed a maize-soybean meal diet containing 0.2% nonphytate phosphorus performed to laying hens fed a diet containing 0.4% nonphytate phosphorus up to 32 wk; egg production was significantly reduced by the lower dietary phosphorus afterwards
Summary
Phosphorus is an essential nutrient for animals. There is increasing concern over excess phosphorus pollution in the environment from poultry production. To reduce excess phosphorus without compromising poultry production, an accurate evaluation of the amount of phosphorus required for laying hens needs to be conducted. Laying hens with the dwarf gene are 10 cm shorter than laying hens without the gene [3] Because of their smaller size, the average daily feed intake during peak egg production is about 85–95 g/bird, 20–25% less than the parent strain, but egg production is increased by 10–15% compared with their counterpart laying hens [3]. It is very likely that the dwarf hen has different phosphorus requirements. Little work has been done to assess the phosphorus requirements of Dwarf pink-shell laying hens
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