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There is often a question how nutrition affects the
hatchability of eggs, especially in broiler
breeders. This is because once an egg is laid, its ability to become a
viable broiler chick is not guaranteed.
Fertility can be influenced
indirectly by nutrition, and even a fertile egg may fail to yield a viable chick
if this egg is missing certain nutrients. Beyond nutrition, of course, it is
assumed that conditions during egg collection, storage, and setting are
Broiler fertility, weight
fertility is influenced in a negative way by obesity. An overweight male or
female bird will always be more reluctant to mate as age progresses than a bird
kept near its recommended size for its age. In a Canadian study, female broiler
breeders that were about 500 grams lighter than recommended weight, during the
end of the laying period, were more fertile (by 2-4 percent points) than females
that were maintained at standard body weight condition.
Today, it is
frequently recommended to closely monitor and control broiler body weight after
the peak of production to reduce the rate of decline in fertility due to age.
This can be achieved by controlling broiler feed composition or its daily
allowance. Naturally, the same guidelines apply to male broiler breeders to
maintain a high mating activity and reduce the decline in sperm quality that
comes with advanced age.
Critical feed vitamins
Hatchability also can be affected by the concentration of vitamins in the broiler breeder feed. For example, a complete omission of riboflavin results in zero
hatchability after seven weeks. However, seven weeks to diagnose such a problem
is not advisable. Instead, a sudden increase in the midterm embryo death rate
(7-14 days) is used as a quick-response index to determine if there is a problem
with the vitamin nutrition of the broiler breeders.
can occur if the vitamin premix is omitted inadvertently during broiler feed
preparation, or if some vitamins are omitted by the manufacturer. In addition,
most vitamins are quite sensitive and prone to destruction and their potency can
be severely reduced during feed manufacturing or storage.
In this case, a
mild deficiency is more likely to occur and as such it is quite difficult to
diagnose properly. Nevertheless, it is important to determine quickly the cause
of vitamin deficiency and correct the problem or increase that vitamin's
concentration in the broiler premix.
Egg size, feed
Finally, hatchability can be affected by egg size, which
is influenced by feed intake and certain nutrients such as methionine.
Under normal conditions, a hen will deposit a standard 2 grams of calcium per
egg, regardless of its size, even if she has to draw such calcium from her bone
reserves. As a result, larger eggs will have thinner shells than smaller eggs.
Eggshell thickness affects the exchange of gases during incubation. If the
incubator humidity is not adjusted properly, this might affect hatchability to a
varied degree. Eggs with thin shells also are quite prone to cracking during
handling, storage and incubation.
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AvicApp.com - Control feed consumption and their nutrients and the body weight of broilers breeders are the cause of high hatchability.
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