Method for increasing calcium of laying hens in an expected laying period

Abstract

The invention relates to a method for increasing calcium of laying hens in an expected laying period. The method comprises the following steps that 5% of premix is provided for the laying hens, and the recommended square stone powder content of the premix is gradually increased from 15 weeks, so that the daily ration stone powder content is gradually increased to 8 - 8.5% in percentage by mass in 22 weeks from 0.8 - 1.2% in percentage by mass in 15 weeks. Marrow bone development and calcium deposition in about 16 weeks are considered, an addition amount of stone powder is gradually increased in advance from 15 weeks, transition is finer, calcium nutrition is more accurate, feed changing stress is reduced, chicken diarrhea is reduced, and the situation that the laying rate is rapidly increased and calcium supply cannot be achieved in the peak period of chicken flocks is avoided.

Description

technical field [0001] The invention relates to the technical field of feed nutrition for laying hens, in particular to a method for increasing calcium for laying hens at the expected delivery date. Background technique [0002] The expected laying date of laying hens generally refers to 15 weeks to the start of laying. According to the feeding stage of Yukou poultry industry, the expected laying date is 99-5% egg production rate (about 44 days in total). Although the expected date of delivery is short, it belongs to the preparation stage before laying. At this stage, laying hens grow and develop rapidly, and calcium deposits in the medullary bone rapidly. Since 20-40% of the calcium in the eggshell is supplied by the medullary bone, if this stage is not prepared in advance Calcium reserves, it is easy to cause poor eggshell quality at the start of production, and the increase in broken soft-shell eggs will seriously cause cage fatigue in laying hens (commonly known as paral...

AI Technical Summary

Problems solved by technology

Although the expected date of delivery is short, it belongs to the preparation stage before laying. At this stage, laying hens grow and develop rapidly, and calcium deposits in the medullary bone rapidly. Since 20-40% of the calcium in the eggshell is supplied by the medullary bone, if this stage is not prepared in advance Calcium reserves, it is easy to cause poor eggshell quality at the start of laying, and the increase in broken soft-shell eggs will seriously cause cage fatigue in laying hens (commonly known as paralyzed chickens)

In addition, the demand for calcium in the expected delivery period increases, and the main calcium source feed for laying hens is stone powder (calcium content> 36%). The amount of stone powder added at this stage will increase significantly, and the stress of refeeding will increase, which will cause a digestive burden on the chickens and easily cause Physiological diarrhea, which leads to loss of nutrients, poor digestion and absorption, and substandard weight

[0003] From the perspective of calcium nutrition, young chicken feed is used in the expected date of delivery, and the calcium content is low, which is likely to cause insufficient calcium reserves, poor eggshell quality of first-laid eggs, and cage fatigue of laying hens; The chicken feed is about 0.8-1% to more than 3.5% during the laying period. If the calcium increases too fast, the physiological diarrhea will be aggravated, the stress of changing the feed will be great, and the death rate will also increase; use the young chicken feed and the laying period feed to mix and transition 1 Compared with the use of young chicken feed alone in the expected laying period or laying period feed, the physiological diarrhea and feeding stress have been alleviated, but the problem still exists

[0004] The prior art also has the use of other laying hen calcium increase patterns during the pre-delivery period, such as starting to increase calcium at 18 weeks, and then three levels of calcium increase (2%, 3%, 3.75%), but this calcium increase mode increases calcium late, and calcium The gradient is small and the transition is fast, which cannot match the large calcium demand changes of laying hens, and the particle size of stone powder is not specified

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