Model for predicting calcium and phosphorus dynamic nutrition requirements of laying hens

Abstract

The invention discloses a model for predicting calcium and phosphorus dynamic nutrition requirements of laying hens. The model for predicting calcium and phosphorus dynamic nutrition requirements of laying hens comprises a model for predicting calcium nutrition requirements of laying hens and a model for predicting phosphorus nutrition requirements of laying hens, the calcium nutrition demand dynamic prediction model of the laying hens comprises calcium nutrition demand dynamic prediction models of 7-10 weeks old, 11-14 weeks old and 15-18 weeks old; the dynamic prediction model for phosphorus nutrition requirements of laying hens comprises 7-10 weeks old, 11-14 weeks old and 15-18 weeks old phosphorus nutrition requirements dynamic prediction models.

Description

Technical Field

[0001] The invention belongs to the technical field of animal nutrition, and in particular relates to a dynamic calcium and phosphorus nutritional requirement prediction model for laying hens. Background Art

[0002] The Jingfen No. 6 laying hen is a high-yielding, powder-shelled egg-laying hen with independent intellectual property rights in my country. It is the world's first red-feathered laying hen to produce powder-shelled eggs. This breed, jointly developed by Beijing Huadu Yukou Poultry Co., Ltd. and China Agricultural University, received the "Livestock and Poultry New Variety (Complementary System) Certificate" [(Nong 09) New Variety Certificate No. 80] in 2019. Calcium and phosphorus are crucial nutrients for laying hens, significantly impacting their growth, development, and production performance. Calcium and phosphorus requirements vary among different breeds, growth stages, and environments. The rearing period is a time of rapid growth, vigorous appetite, and development for laying hens. During this period, the body's calcium and phosphorus absorption capacity continues to increase, necessitating sufficient calcium reserves for peak egg production. However, dietary calcium and phosphorus levels that are too low can lead to insufficient calcium reserves and poor egg production during peak egg production. Excessive dietary calcium and phosphorus levels can affect the hens' ability to absorb other trace elements, leading to resource waste, increased feed costs, and environmental pollution. The precise supply of calcium and phosphorus in the diet is crucial for laying hen farming. Currently, the calcium and phosphorus nutritional requirements of Jingfen No. 6 laying hens during the growing period (see Table 1) are primarily based on the 2022 "Yukou Layer Breeding Manual - Jingfen No. 6," which does not provide reference values for total phosphorus requirements at 7-10 weeks and 11-14 weeks of age.

[0003] Table 1 Recommended calcium and phosphorus requirements for feed during the rearing-expected laying period (43 days of age-5% egg production rate) recommended in the "Yukou Layer Breeding Manual - Jingfen No. 6"

[0004] Element / week age 7-10 weeks old 11-14 weeks old 15 weeks of age - 5% egg production Total calcium (%) 0.9 0.80 2.2-2.9 Total phosphorus (%) - - 0.70 Available phosphorus (%) 0.43 0.42 0.50

[0005] NOTE: 5% egg production occurs at approximately 18 weeks of age. Summary of the Invention

[0006] The present invention aims to overcome the deficiencies of the prior art and provides a dynamic calcium and phosphorus nutritional requirement prediction model for laying hens.

[0007] In order to achieve the above object, the technical solution provided by the present invention is:

[0008] The laying hen calcium and phosphorus dynamic nutritional requirement prediction model includes a laying hen calcium nutritional requirement dynamic prediction model and a laying hen phosphorus nutritional requirement dynamic prediction model; the laying hen calcium nutritional requirement dynamic prediction model includes calcium nutritional requirement dynamic prediction models for laying hens at 7-10 weeks of age, 11-14 weeks of age, and 15-18 weeks of age; the laying hen phosphorus nutritional requirement dynamic prediction model includes phosphorus nutritional requirement dynamic prediction models for laying hens at 7-10 weeks of age, 11-14 weeks of age, and 15-18 weeks of age;

[0009] The dynamic prediction models for calcium nutritional requirements at 7-10 weeks, 11-14 weeks, and 15-18 weeks are:

[0010] ①Ca=

[0011] (0.301258449552464*EXP(-3.620141*EXP(-0.024078*t))+160.419017573916*EXP

[0012] (-3.620141*EXP(-0.024078*t))-0.024078*t)*(-1E-06*t 2 +0.0029*t-

[0013] 0.5362)) / 75.1%;

[0014] ②Ca=

[0015] (0.368975144531626*EXP(-3.620141*EXP(-0.024078*t))+160.419017573916*EXP

[0016] (-3.620141*EXP(-0.024078*t))-0.024078*t)*(-1E-06*t 2 +0.0029*t-

[0017] 0.5362)) / 80.1%;

[0018] ③Ca=

[0019] (1.06979718808626*EXP(-3.620141*EXP(-0.024078*t))+160.419017573916*EXP

[0020] (-3.620141*EXP(-0.024078*t))-0.024078*t)*(-1E-06*t 2 +0.0029*t-0.5362))

[0021] / 76.3%;

[0022] Wherein, Ca is the calcium requirement, in g; t is the age of the chicken, in d;

[0023] The dynamic prediction models for phosphorus nutritional requirements at 7-10 weeks, 11-14 weeks, and 15-18 weeks are:

[0024] ①P=(0.269956962*EXP(-3.620141*EXP(-0.024078*t)))+160.419017573916*EXP

[0025] (-3.620141*EXP(-0.024078*t))-0.024078*t)*(0.0003*t+0.4848) / 58.98%;

[0026] ②P=(0.330526022*EXP(-3.620141*EXP(-0.024078*t)))+160.419017573916*EXP

[0027] (-3.620141*EXP(-0.024078*t))-0.024078*t)*(0.0003*t+0.4848) / 61.87%;

[0028] ③P=(0.404630521*EXP(-3.620141*EXP(-0.024078*t)))+160.419017573916*EXP

[0029] (-3.620141*EXP(-0.024078*t))-0.024078*t)*(0.0003*t+0.4848) / 69.60%;

[0030] Among them, P is the phosphorus requirement, in g; t is the age of the chicken, in d.

[0031] Preferably, the dynamic prediction model for calcium nutritional requirements of laying hens is obtained by combining the net calcium requirement model for maintenance at 7-10 weeks of age, 11-14 weeks of age, and 15-18 weeks of age and the net calcium requirement prediction model for weight gain;

[0032] The net calcium requirement models for maintaining the body at 7-10 weeks, 11-14 weeks, and 15-18 weeks are:

[0033] ①Ca=0.301258449552464*EXP(-3.620141*EXP(-0.024078*t));

[0034] ②Ca=0.368975144531626*EXP(-3.620141*EXP(-0.024078*t));

[0035] ③Ca=1.06979718808626*EXP(-3.620141*EXP(-0.024078*t));

[0036] The net calcium requirement prediction model for weight gain is:

[0037] Ca=(160.419017573916*EXP(-3.620141*EXP(-0.024078*t))-0.024078*t)*

[0038] (-1E-06*t 2 +0.0029*t-0.5362);

[0039] Among them, Ca is the calcium requirement, unit is g; t is the age of the chicken, unit is d.

[0040] Preferably, the dynamic prediction model for phosphorus nutritional requirements of laying hens is obtained by combining the net maintenance phosphorus requirement model for 7-10 weeks of age, 11-14 weeks of age, and 15-18 weeks of age and the net weight gain phosphorus requirement prediction model;

[0041] The net phosphorus requirement models for maintenance at 7-10 weeks, 11-14 weeks, and 15-18 weeks are:

[0042] ①P=0.269956962*EXP(-3.620141*EXP(-0.024078*t));

[0043] ②P=0.330526022*EXP(-3.620141*EXP(-0.024078*t));

[0044] ③P=0.404630521*EXP(-3.620141*EXP(-0.024078*t));

[0045] The net phosphorus requirement prediction model for weight gain is:

[0046] Ca=(160.419017573916*EXP(-3.620141*EXP(-0.024078*t))-0.024078*t)*

[0047] (0.0003*t+0.4848);

[0048] Among them, P is the phosphorus requirement, in g; t is the age of the chicken, in d.

[0049] Preferably, the laying hen is Jingfen No. 6 laying hen.

[0050] The 7-10, 11-14, and 15-18 weeks of age include the rearing period to the expected date of delivery.

[0051] Based on the above-mentioned laying hen calcium and phosphorus dynamic nutritional requirement prediction model, the laying hen calcium and phosphorus nutrition can be dynamically controlled.

[0052] The present invention will be further described below:

[0053] Model of the present invention

[0054] The model of the present invention is constructed based on the factorial analysis method, which divides the total calcium and phosphorus requirements of laying hens into maintenance needs and weight gain needs. By systematically carrying out the Jingfen No. 6 laying hen feeding experiment, the feed intake, body weight, carcass calcium and phosphorus deposition and calcium and phosphorus content in excrement at different ages were measured, and the true metabolic rate of calcium and phosphorus and endogenous excretion were calculated. Using mathematical fitting methods, the exponential relationship between the net calcium and phosphorus requirement for maintenance and age, as well as the polynomial relationship between the net calcium and phosphorus requirement for weight gain and age were determined respectively. Finally, combined with the true metabolic rate for correction, a dynamic prediction model for each week of age was formed to achieve accurate quantification of calcium and phosphorus nutritional needs.

[0055] The present invention provides a dynamic prediction model for the calcium and phosphorus nutritional requirements (excluding phytase) of Jingfen No. 6 laying hens from the rearing period to the expected laying period. Taking 7-10 weeks of age, 11-14 weeks of age, and 15 weeks of age to 18 weeks of age as the growth intervals, the recommended total calcium amounts are 0.57-0.80%, 0.72-0.79%, and 1.71-1.85%, respectively, which are respectively reduced by 1.2%, 12.2%, and 26.0% compared with the current recommended amounts; the recommended total phosphorus amounts are 0.60-0.75%, 0.69-0.79%, and 0.78-0.82%, respectively. DETAILED DESCRIPTION

[0056] The laying hen calcium and phosphorus dynamic nutritional requirement prediction model includes a laying hen calcium nutritional requirement dynamic prediction model and a laying hen phosphorus nutritional requirement dynamic prediction model; the laying hen calcium nutritional requirement dynamic prediction model includes calcium nutritional requirement dynamic prediction models for laying hens at 7-10 weeks of age, 11-14 weeks of age, and 15-18 weeks of age; the laying hen phosphorus nutritional requirement dynamic prediction model includes phosphorus nutritional requirement dynamic prediction models for laying hens at 7-10 weeks of age, 11-14 weeks of age, and 15-18 weeks of age;

[0057] The dynamic prediction models for calcium nutritional requirements at 7-10 weeks, 11-14 weeks, and 15-18 weeks are:

[0058] ①Ca=

[0059] (0.301258449552464*EXP(-3.620141*EXP(-0.024078*t))+160.419017573916*EXP

[0060] (-3.620141*EXP(-0.024078*t))-0.024078*t)*(-1E-06*t 2+0.0029*t-

[0061] 0.5362)) / 75.1%;

[0062] ②Ca=

[0063] (0.368975144531626*EXP(-3.620141*EXP(-0.024078*t))+160.419017573916*EXP

[0064] (-3.620141*EXP(-0.024078*t))-0.024078*t)*(-1E-06*t 2 +0.0029*t-

[0065] 0.5362)) / 80.1%;

[0066] ③Ca=

[0067] (1.06979718808626*EXP(-3.620141*EXP(-0.024078*t))+160.419017573916*EXP

[0068] (-3.620141*EXP(-0.024078*t))-0.024078*t)*(-1E-06*t 2 +0.0029*t-0.5362))

[0069] / 76.3%;

[0070] Wherein, Ca is the calcium requirement, in g; t is the age of the chicken, in d;

[0071] The dynamic prediction models for phosphorus nutritional requirements at 7-10 weeks, 11-14 weeks, and 15-18 weeks are:

[0072] ①P=(0.269956962*EXP(-3.620141*EXP(-0.024078*t)))+160.419017573916*EXP

[0073] (-3.620141*EXP(-0.024078*t))-0.024078*t)*(0.0003*t+0.4848) / 58.98%;

[0074] ②P=(0.330526022*EXP(-3.620141*EXP(-0.024078*t)))+160.419017573916*EXP

[0075] (-3.620141*EXP(-0.024078*t))-0.024078*t)*(0.0003*t+0.4848) / 61.87%;

[0076] ③P=(0.404630521*EXP(-3.620141*EXP(-0.024078*t)))+160.419017573916*EXP

[0077] (-3.620141*EXP(-0.024078*t))-0.024078*t)*(0.0003*t+0.4848) / 69.60%;

[0078] Among them, P is the phosphorus requirement, in g; t is the age of the chicken, in d.

[0079] The dynamic prediction model for calcium nutritional requirements of laying hens is obtained by combining the net calcium requirement model for maintenance at 7-10 weeks, 11-14 weeks, and 15-18 weeks and the net calcium requirement prediction model for weight gain;

[0080] The net calcium requirement models for maintaining the body at 7-10 weeks, 11-14 weeks, and 15-18 weeks are:

[0081] ①Ca=0.301258449552464*EXP(-3.620141*EXP(-0.024078*t));

[0082] ②Ca=0.368975144531626*EXP(-3.620141*EXP(-0.024078*t));

[0083] ③Ca=1.06979718808626*EXP(-3.620141*EXP(-0.024078*t));

[0084] The net calcium requirement prediction model for weight gain is:

[0085] Ca=(160.419017573916*EXP(-3.620141*EXP(-0.024078*t))-0.024078*t)*

[0086] (-1E-06*t 2 +0.0029*t-0.5362);

[0087] Among them, Ca is the calcium requirement, unit is g; t is the age of the chicken, unit is d.

[0088] The dynamic prediction model for phosphorus nutritional requirements of laying hens is obtained by combining the net phosphorus requirement models for maintenance at 7-10 weeks, 11-14 weeks, and 15-18 weeks and the net phosphorus requirement prediction model for weight gain;

[0089] The net phosphorus requirement models for maintenance at 7-10 weeks, 11-14 weeks, and 15-18 weeks are:

[0090] ①P=0.269956962*EXP(-3.620141*EXP(-0.024078*t));

[0091] ②P=0.330526022*EXP(-3.620141*EXP(-0.024078*t));

[0092] ③P=0.404630521*EXP(-3.620141*EXP(-0.024078*t));

[0093] The net phosphorus requirement prediction model for weight gain is:

[0094] Ca=(160.419017573916*EXP(-3.620141*EXP(-0.024078*t))-0.024078*t)*

[0095] (0.0003*t+0.4848);

[0096] Among them, P is the phosphorus requirement, in g; t is the age of the chicken, in d.

[0097] The laying hen is Jingfen No. 6 laying hen.

[0098] The 7-10, 11-14, and 15-18 weeks of age include the rearing period to the expected date of delivery.

[0099] When applying the above-mentioned laying hen calcium and phosphorus dynamic nutritional requirement prediction model, the following operations are performed:

[0100] Dynamic control of calcium:

[0101] According to the total net calcium requirement and true calcium metabolic rate of laying hens at each stage, the total physiological calcium requirement of laying hens at 7-10 weeks of age, 11-14 weeks of age, and 15-18 weeks of age is calculated to be 0.34-0.50g / d, 0.49-0.53g / d, and 1.21-1.31g / d, respectively.

[0102] Based on the total daily net calcium and total calcium requirements, feed intake, and dry matter rate of laying hens at each stage, the physiological requirements of available calcium expressed as a percentage of the diet for laying hens at 7-10 weeks of age, 11-14 weeks of age, and 15-18 weeks of age were calculated to be 0.39-0.54%, 0.52-0.56%, and 1.17-1.26%, respectively; the physiological requirements of total calcium expressed as a percentage of the diet were 0.51-0.72%, 0.64-0.70%, and 1.53-1.66%, respectively (Table 2).

[0103] Table 2 Total calcium requirement of Jingfen No. 6 laying hens from the rearing period to the expected laying period

[0104]

[0105] Su Lanli et al. (2007) reported that the mixing uniformity of laying hen feeds varied based on different nutritional indicators. Using calcium content as an indicator, the CV of laying hen diets was 10.42%. Based on this data and the derived physiological calcium requirement, the recommended dietary allowance was statistically estimated (Tables 3 and 4).

[0106] Table 3 Correspondence between the probability that the total calcium content of the actual diet consumed is not lower than the physiological requirement and the recommended total calcium amount

[0107]

[0108] Table 4 Correspondence between the probability that the available calcium content of the actual consumed diet is not lower than the physiological requirement and the recommended amount of available calcium

[0109]

[0110] Because calcium is the least uniformly mixed component in laying hen diets, setting an excessively high expected probability may result in some hens significantly exceeding their required intake. Therefore, an expected probability of 84% is recommended. Therefore, the recommended total calcium intakes for Jingfen 6 laying hens from the rearing period to the expected laying date are 0.57-0.80%, 0.72-0.79%, and 1.71-1.85% for 7-10, 11-14, and 15-18 weeks of age, respectively. These are reductions of 1.2%, 12.2%, and 26.0% from current recommendations, respectively. If phytase is used in the feed, the dietary calcium content can be reduced accordingly based on the concentration of calcium released per unit of phytase.

[0111] 7-10 weeks of age: This model recommends a calcium content of 0.57-0.80%. In Table 8, Ca1 (0.64%) and Ca2 (0.72%) fall within this range. The ADG values for the Ca1 and Ca2 groups were not significantly different from those for the Con group. However, the ADFI value for the Ca2 group was significantly lower than that for the Con group. This indicates that calcium levels within the model's recommended range can reduce feed intake and improve feed efficiency while ensuring weight gain.

[0112] 10-14 weeks: The model-recommended calcium content is 0.72-0.79%. In terms of ADG, there was no significant difference between the Ca1 group (0.72%, within the model-recommended range) and the Con group, but the Con group had a higher calcium content, suggesting that the model-recommended amount can reduce calcium waste and lower feed costs while still meeting growth requirements.

[0113] 15-18 weeks: The recommended calcium content is 1.71-1.85%. There were no significant differences in ADG and ADFI among the groups.

[0114] Table 5 Effects of dietary calcium content on growth performance of laying hens during the rearing period

[0115]

[0116] Dynamic Control of Phosphorus:

[0117] According to the total net phosphorus requirement and true phosphorus metabolic rate of laying hens at each stage, the total calcium physiological requirements of laying hens at 7-10 weeks of age, 11-14 weeks of age, and 15-18 weeks of age are calculated to be 0.35-0.43g / d, 0.47-0.53g / d, and 0.55-0.58g / d, respectively.

[0118] Based on the daily requirements of total net phosphorus and total phosphorus, feed intake and dry matter rate of laying hens at each stage, the physiological requirements of available phosphorus expressed as a percentage of the diet for laying hens at 7-10 weeks of age, 11-14 weeks of age and 15-18 weeks of age were calculated to be 0.31-0.39%, 0.38-0.43% and 0.48-0.51% respectively; the physiological requirements of total phosphorus expressed as a percentage of the diet were 0.53-0.66%, 0.61-0.70% and 0.70-0.73% respectively (Table 5).

[0119] Table 6 Total phosphorus requirements of Jingfen No. 6 laying hens during the rearing and expected laying period

[0120]

[0121] Su Lanli et al. (2007) reported that the mixing uniformity of laying hen feeds varied based on different nutritional indicators. Using calcium content as an indicator, the CV of laying hen diets was 10.42%. Based on this data and the derived physiological phosphorus requirement, the recommended dietary allowances were statistically estimated (Tables 6 and 7).

[0122] Table 7 Correspondence between the probability that the total phosphorus content of the actual diet consumed is not lower than the physiological requirement and the recommended total phosphorus amount

[0123]

[0124] Table 8 Correspondence between the probability that the available phosphorus content of the actual consumed diet is not lower than the physiological requirement and the recommended amount of available phosphorus

[0125]

[0126] Taking a 90% probability as an example, the recommended total phosphorus levels for laying hens at 7-10, 11-14, and 15-18 weeks of age are 0.60-0.75%, 0.69-0.79%, and 0.78-0.82%, respectively. If phytase is used in the feed, the total phosphorus content of the diet can be reduced accordingly based on the amount of phosphorus released per unit of phytase.

[0127] 7-10 weeks: The recommended total phosphorus content in the present model is 0.60-0.75%. As shown in Table 9, the ADG (20.01 g) in group P1 was the highest and significantly higher than in the other groups. As phosphorus content increased, ADG decreased significantly. For example, although group P1 slightly exceeded the upper limit of the recommended value, it still demonstrated good growth performance close to the recommended value.

[0128] 11-14 weeks: The model recommends a total phosphorus content of 0.69-0.79%. The P1 group (0.77%) fell within the recommended range. There were no significant differences in ADG and ADFI between the P1 group and the Con group. Stable growth performance was maintained within the appropriate phosphorus content range.

[0129] 15-18 weeks: The model recommends a total phosphorus content of 0.78-0.82%. The P1 group (0.83%) fell within the model's recommended range. The Con group had the highest ADG, but this was not significantly different from the P1 group. This suggests that within the model's recommended phosphorus content, good weight gain can still be achieved, more in line with the concept of targeted nutritional supply, and avoiding the potential for feed waste and increased environmental emissions associated with high phosphorus levels.

[0130] Table 9 Effects of dietary phosphorus content on growth performance of laying hens during the rearing period

[0131]

Claims

1. A dynamic calcium and phosphorus nutritional requirement prediction model for laying hens, characterized in that: The laying hen calcium and phosphorus dynamic nutritional requirement prediction model includes a laying hen calcium nutritional requirement dynamic prediction model and a laying hen phosphorus nutritional requirement dynamic prediction model; the laying hen calcium nutritional requirement dynamic prediction model includes calcium nutritional requirement dynamic prediction models for laying hens at 7-10 weeks of age, 11-14 weeks of age, and 15-18 weeks of age; the laying hen phosphorus nutritional requirement dynamic prediction model includes phosphorus nutritional requirement dynamic prediction models for laying hens at 7-10 weeks of age, 11-14 weeks of age, and 15-18 weeks of age; The dynamic prediction models for calcium nutritional requirements at 7-10 weeks, 11-14 weeks, and 15-18 weeks are: ①Ca = (0.301258449552464*EXP(-3.620141*EXP(-0.024078*t))+160.419017573916*EXP(-3.620141*EXP(-0.024078*t))-0.024078*t)*(-1E-06*t 2 +0.0029*t - 0.5362)) / 75.1%; ②Ca = (0.368975144531626*EXP(-3.620141*EXP(-0.024078*t))+160.419017573916*EXP(-3.620141*EXP(-0.024078*t))-0.024078*t)*(-1E-06*t 2 +0.0029*t - 0.5362)) / 80.1%; ③Ca = (1.06979718808626*EXP(-3.620141*EXP(-0.024078*t))+160.419017573916*EXP(-3.620141*EXP(-0.024078*t))-0.024078*t)*(-1E-06*t 2 +0.0029*t - 0.5362)) / 76.3%; Where, Ca is the calcium requirement, in g; t is the age of the chicken, in d; The dynamic prediction models for phosphorus nutritional requirements at 7-10 weeks, 11-14 weeks, and 15-18 weeks are: ①P = (0.269956962*EXP(-3.620141*EXP(-0.024078*t)))+160.419017573916*EXP(-3.620141*EXP(-0.024078*t))-0.024078*t)*(0.0003*t +0.4848) / 58.98%; ②P = (0.330526022*EXP(-3.620141*EXP(-0.024078*t)))+160.419017573916*EXP (-3.620141*EXP(-0.024078*t))-0.024078*t)*(0.0003*t +0.4848) / 61.87%; ③P = (0.404630521*EXP(-3.620141*EXP(-0.024078*t)))+160.419017573916*EXP (-3.620141*EXP(-0.024078*t))-0.024078*t)*(0.0003*t +0.4848) / 69.60%; Where P is the phosphorus requirement, in g; t is the age of the chicken, in d.

2. The laying hen calcium and phosphorus dynamic nutritional requirement prediction model according to claim 1, wherein: The dynamic prediction model for calcium nutritional requirements of laying hens is obtained by combining the net calcium requirement model for maintenance at 7-10 weeks, 11-14 weeks, and 15-18 weeks and the net calcium requirement prediction model for weight gain; The net calcium requirement models for maintaining the body at 7-10 weeks, 11-14 weeks, and 15-18 weeks are: ①Ca=0.301258449552464*EXP(-3.620141*EXP(-0.024078*t)); ②Ca=0.368975144531626*EXP(-3.620141*EXP(-0.024078*t)); ③Ca=1.06979718808626*EXP(-3.620141*EXP(-0.024078*t)); The net calcium requirement prediction model for weight gain is: Ca=(160.419017573916*EXP(-3.620141*EXP(-0.024078*t))-0.024078*t)*(-1E-06*t 2 + 0.0029*t - 0.5362); Wherein, Ca is the calcium requirement, in g; t is the age of the chicken, in d.

3. The laying hen calcium and phosphorus dynamic nutritional requirement prediction model according to claim 1, wherein: The dynamic prediction model for phosphorus nutritional requirements of laying hens is obtained by combining the net phosphorus requirement models for maintenance at 7-10 weeks, 11-14 weeks, and 15-18 weeks and the net phosphorus requirement prediction model for weight gain; The net phosphorus requirement models for maintenance at 7-10 weeks, 11-14 weeks, and 15-18 weeks are: ①P=0.269956962*EXP(-3.620141*EXP(-0.024078*t)); ②P=0.330526022*EXP(-3.620141*EXP(-0.024078*t)); ③P=0.404630521*EXP(-3.620141*EXP(-0.024078*t)); The net phosphorus requirement prediction model for weight gain is: Ca=(160.419017573916*EXP(-3.620141*EXP(-0.024078*t))-0.024078*t)*(0.0003*t +0.4848); Where P is the phosphorus requirement, in g; t is the age of the chicken, in d.

4. The laying hen calcium and phosphorus dynamic nutritional requirement prediction model according to claim 1, wherein: The laying hen is Jingfen No. 6 laying hen.

5. The laying hen calcium and phosphorus dynamic nutritional requirement prediction model according to claim 1, wherein: The 7-10, 11-14, and 15-18 weeks of age include the rearing period to the expected date of delivery.

6. A method for controlling calcium and phosphorus nutrition in laying hens, characterized in that: The laying hen calcium and phosphorus nutrition control method is a method for dynamically controlling the laying hen calcium and phosphorus nutrition requirements prediction model according to any one of claims 1 to 5.

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