04/11/2022
Body weight and uniformity assessment
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Monitoring the body weight progression of the birds during the growing and rearing periods is essential to obtain good uniformity. Birds outside the pattern can delay and anticipate the start of egg production, however, in either situation there will be a compromise with the flock performance. To avoid this, our goal is to achieve 80% uniformity, representing an individual weight variation of 10% below and 10% above the average weight. It should be noted that the body development of the layer occurs according to a sequence of events.
Up to 6 weeks of age the organs of the digestive tract and the immune system present much of their development.From 6 to 12 weeks there is a period of rapid growth, a stage in which the hen obtains most of the adult growth, i.e: Muscular growth, bone and feather development, with 95% of the skeleton developing at the end 12 weeks.
Therefore, good production practices should be put in place from incubation to the rearing and production phases.
For this reason, it is essential that the flock is healthy and the feed supply, water and temperature levels, trough space, beak trimming, and density are all adequate.
When the flock is uniform, there is the guarantee of:
A good production peakHigher egg massGreater persistenceA uniform egg size
Beak trimming
Due to increased production, laying birds are more susceptible to aggressiveness and cannibalism. The manifestation of this type of behavior can be associated with:
Beak shapeLight intensityGenetic predisposition for aggressionAgeNutritionDensity in the cage or floorBird hierarchy within the group
Beak trimming, in addition to avoiding cannibalism, is a management practice that reduces mortality and productive performance of birds and provides better usage of the feed.
The loss of feathers resulting from aggression within the flock can cause both economic problems for the producer and welfare problems for the birds.
The economic loss is due to the fact that the removal of feathers leads to problems in maintaining body temperature, leading to an increase in feed consumption, as well as pecked eggs in some cases.
Stress, resulting from the wrong procedure and failure to trim beaks, can affect the initial production of eggs. For this reason, this is considered a precision operation where the experience of the team that performs it is a key feature for its success.
Feeding
Nowadays, it is common to observe the launching of laying hens in the market with high production rates and persistence of production together with a low feed consumption. As a consequence, the birds became more demanding and show difficulty in gaining weight.
The growing and rearing phases are responsible for the good or bad development of the birds, and may be influenced by various factors, which interfere with feed consumption, such as:
EnvironmentLine genetics, where there are specific peculiaritiesHealthNutritional requirement
These factors are interrelated and their effects on birds are interdependent, for example: improper placement of layers can influence the body weight of the birds, which affects the productive period and the weight of the eggs. The feeding programs are part of the factors that provide a good uniformity to the batch, their function is:
Adapt nutrient levels according to the age and development of birdsProvide adequate amounts according to requirementOptimize costsReduce excess nutrients and reduce excretion of unused nutrients
In order for the feeding program to be adequate, it is necessary to know the main nutritional aspects of each stage of development of the layers. This practice will give the producer autonomy on the decisions to be made based on the age and weight of the flock, in which nutritional levels can be reduced or increased and feed intake can be regulated according to the requirements of the birds.
Light program
Various environmental factors play important roles in controlling the biological functions of birds, light being one of them. Programs with artificial lighting have been used in the production of layers, and breeding stock, to perfect weight gain, control age by delaying the sexual maturity of chickens by stimulating the reproductive system in the appropriate period. From there the objective is to stimulate egg production and synchronize laying and thus:
Increasing the production of eggs in the first phase of production, improving the number of hatching eggs, increasing the size of the first eggs and reducing overweight birds due to excessive storage of fat, since the feeding surplus in this phase is for maintenance and production.
The choice of bulb type will depend on many factors, such as cost, durability, maintenance, and efficiency. In practical terms, incandescent and fluorescent bulbs are used because they have greater intensity and durability, less maintenance, and less energy expenditure.
In the case of a change in feed quality, it should be taken into account that, in order to have good production rates, it is necessary that the practices of temperature control, housing density, body weight evaluation, uniformity, beak trimming, feeding and light program are applied correctly. These actions serve to favor the suitable development and growth of the birds, as well as allow good productive indexes in the laying phase and thus guaranteeing a successful outcome.
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