At present, the specialized breeders of commercial layer chickens mainly use self-formulated feeds. Although the breeders attach great importance to the nutritional balance of layered chickens, they are also unreasonable. Here are some problems that should be paid attention to in terms of protein and additives in the feed ratio in the case of Roman layer chickens.
1, protein
1 The crude protein content of broilers (9-20 weeks old) should not exceed 14.5%. The lower feed crude protein content at this stage is conducive to a longer egg-laying rate in laying hens.
2 The content of crude protein in feeds at the beginning of production (around 21 weeks of age) must be determined by the daily feed intake of laying hens at that time. At this stage, each layer must be guaranteed to consume 19.6 grams of crude protein per day. Therefore, when each layer of chickens feeds 100 grams a day, the crude protein content of feed should reach 19.6%; when the intake increases to 120 grams, the crude protein content of feed should be reduced to 16.5%. The egg production rate of first-laying hens was quickly pushed to the peak.
The daily requirement of crude protein for layers after 342 weeks of age will drop to 17.8 grams. With the increase of egg production rate under the natural and daily intake, the crude protein content of commercial layer chicken feed will drop to about 15%. Some breeders mistakenly believe that the drop in egg production rate is due to insufficient crude protein content in the feed to increase the crude protein content of the feed. The results not only affect the health of the chicken population, but also increase the cost of raising chickens.
2, feed additives
1 It is not a illusion that the methionine must be added because it is a feed for laying hens. Since almost all the layer chickens have their own feed, they are based on corn + soybean cake + imported fish meal. Although the content of lysine and methionine in corn is insufficient, soybean cake and imported fishmeal are rich in lysine and methionine. Therefore, methionine and lysine are generally not lacking when the level of crude protein in the layer feed reaches a standard level. If you really want to add methionine, it is best to add lysine at the same time.
2 After the laying hens are put into production, it is best to add some choline in the feed. However, care must be taken not to add water-soluble vitamins and bone powder together with calcium hydrogen phosphate. Because choline is easily soluble in water and strong in alkalinity, it has a destructive effect on water-soluble vitamin C and vitamin B, while calcium and phosphorus are easily absorbed only in an acidic environment.
3 When oxytetracycline is added as a growth promoter or an antibiotic to treat diseases, it cannot be added simultaneously with cyanline, streptomycin, and calcium carbonate. Because the aqueous solution of oxytetracycline is strongly acidic, the streptomycin can be destroyed, and the aqueous solution of calcium carbonate is strongly alkaline, which in turn destroys oxytetracycline.
At present, the proportion of self-prepared feed in layer chicken production accounts for a considerable proportion, which can not only reduce the cost of feeding, but also maintain the freshness of feed. But the premise must be a balanced balance of various nutrients in the feed, otherwise it will only be counterproductive.
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