Factors affecting egg size and their regulation (below)
Release time:
Oct 21,2019
3Environmental factors
Under the same environmental conditions, eggs laid by caged chickens are usually slightly larger than those laid by flat chickens.
The effect of temperature. Hens born in spring have a higher egg laying rate and lower egg weight than those born in autumn.temperature30Above ℃, the higher the temperature, the smaller the eggs laid by the hens. Due to the slow discharge of the heat consumption generated by the feeding of the flock at high temperatures, the feeding capacity decreases, and the intake of energy will not be able to be guaranteed.The minimum maintenance demand at times of high production. In this environmental factor, if you can reduce heat consumption and improve energy intake, egg production.Performance will improve. The simple way is to increase the amount of vegetable oil added.0.5~0.7%, and improve the absorption and emptying rate of the diet, can reduce the loss of eggs caused by heat stress. However, due to the high temperature protein intake is always difficult to improve, so the summer egg weight is mostly smaller than other seasons.Professor Reid of the University of Arizona pointed out that SherwinContinued32.2℃The ratio of the temperature of the laying hens raised in the environment is controlled21℃The egg weight of the chickens is determined59grams dropped56g.
4.Disease factors.
There are many diseases that seriously affect the reproductive tract and affect the quality and yield of eggs, such as Newcastle disease.Influenza, infectious bronchitis, etc. can cause varying degrees of egg production reduction, deformed eggs, and even false hens.
5.Development of reserve chickens and their age at birth
The weight of the opening hen has an important influence on the egg weight. The greater the opening weight, the greater the egg weight.The growth of the reserve hens was the most sensitive to the energy concentration of the diet, which was12~20 Week-old growing chickens canThe amount of food intake has the greatest impact. Increasing the energy intake can produce a larger weight reserve hen, so increasing the energy intake and thus achieving a good reserve chicken weight is a prerequisite for obtaining a good egg weight..
The opening age of the flock directly affects the egg weight of the whole laying period, so the timely opening can increase the egg weight of the whole laying period.In general, the earlier a chicken starts to give birth, the earlier it lays its eggs.The smaller the weight, and vice versa.According to the results of the study of Isa brown-shell laying hens, the average increase in egg weight is one day later than the opening age.0.15g.The older the first egg laid by the hen, the larger the egg type, and the more eggs laid in winter than in summerThe big.The eggs laid by first-time hens are the smallest in the whole process, and the egg weight increases gradually with age.At present, the use of various feeding management technical measures (such as incubation period of light, feeding restrictions, etc.)Can regulate the opening age of chickens to produce large.Small suitable eggs, while the total annual egg weight is unchanged.In order to obtainThe larger the egg, the weight of the hen reaches1.5~1.6The kilogram was not previously recommended to use light stimulation to promote sexual maturity.
The following table lists the production of eggs inChanges in egg weight at various stages during the period.
Table 1 Based on the average annual egg weight100 %The egg weight changes in the various stages of the representation of
|
Egg stage (weeks) |
18-21 |
22-25 |
26-29 |
30-33 |
34-37 |
38-41 |
42-45 |
46-49 |
50-53 |
54-57 |
58-61 |
62-65 |
66-69 |
|
Egg weight (%) |
80.7 |
88.3 |
94.6 |
98 |
100.2 |
101.8 |
102.8 |
103.7 |
104.4 |
105.7 |
106.1 |
106.7 |
107.2 |
Note: per 4 week as an egg-laying stage, with an average annual egg weight100%rather than the actual absolute egg weight.
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