At present, due to rising feed prices, laying chicken breeding efficiency is very low. The timely elimination of low-yielding, sick and non-economic laying hens not only saves feed, reduces feeding costs, improves the uniformity of the chicken population, but also effectively reduces the occurrence of diseases.
First, elimination time. After laying eggs for 210 days, laying hens are the best time to be eliminated for the first time. If 1% of the chickens are discontinued and the chickens are just sold, the elimination can be implemented.
Second, the identification method.
(1) During the laying of chickens, gonad activity and metabolic function hyperactivity, ovary, fallopian tube and digestive function are very strong, which determines the difference in appearance between laying hens and discontinued chickens.
1 Crown and meat crickets: The crown and meat of the laying hens are large and bright red, plump, and feel warm when touched; the production of the chicken crowns and minced meats is small and wrinkled, showing pink or dark red.
2 abdominal volume: the abdomen is the location of the digestive and reproductive organs. Laying chickens have developed digestive and genital organs. They are bulky and have a large abdominal volume. On the contrary, chickens that are out of production have the same abdominal volume.
3 Pigment transformation: After the hen begins to lay eggs, the yellow pigment is gradually transferred to the egg yolk. The yellow pigment of the anus, gills, face, ankles, ears, toes, and other parts of the hen lacks supplements, gradually turning brown to pale yellow or white. . In general, the yellow pigments on the epidermis of the laying hens have faded out in autumn, and these parts of the chickens are still yellow.
(2) Difference in appearance between high-yield and low-yield chickens.
1 Appearance Body Type: High-yield chickens are of good health, well-balanced structure, normal development, lively and active, strong foraging; heads are delicate, no fat is accumulated, frontal bone is wide, head and neck are almost square; jaws are short, wide and curved; eyes are large It is round and full of spirit; chest is wide and deep, prominent forward, body length; both lengths are moderate. The opposite is true of low-yielding chickens. Although the body is healthy, it is either too fat or too thin; it is over-tempered, poor in foraging; the head is thick or small, the top of the head is narrow and rectangular; the pods are long and straight; the eyes are oval, and the eyes are dull. The chest is narrow and shallow; the body is narrow and short.
2 Moulting: Late breeding of high-yielding chickens is usually late in the fall or early winter, and moulting is quick and the production time is short; some special high-yielding chickens do not even moult throughout the winter, or change only a batch of feathers. The production time is very short. It is short. In the spring of next year, the temperature will rise and the light will increase. When the nutrients are abundant, the eggs will be moulted. Low-yielding chickens, on the other hand, often moult in the late summer and early autumn, and last for a long time.
Third, timely inspections. In order to facilitate management and improve economic efficiency, it is necessary to observe and inspect at any time and eliminate low-yield chickens and sick chickens. During the inspection, first of all, when looking at the chickens in the morning and at night, special attention should be paid to those who are abnormally thick, large and bright red, with wrinkles on their faces, plump and plump, with thick body, zygomatic, toe hypertrophy, and tactile sensations. Thick, these are the characteristics of low-yielding chickens and must be eliminated. Secondly, at night or at the henhouse to inspect chicken droppings, most of the normal laying hens' stools are often soft and moist; while the chickens that are discontinued have less intake, slow digestion, and atrophy of the digestive tract, and the stools are dry and thin. You should readily catch the chickens that are resting on the stilts and then observe obsolescence according to the appearance characteristics of the low-yielding chickens. Or observe in isolation, those who do not produce eggs are eliminated. Finally, for those chickens or suspicious individuals found at any time in the management process, isolation therapy should be singled out immediately; chickens suffering from egg yolk peritonitis, Marek’s disease, and parasitic diseases, and chickens that stop laying layers should immediately Eliminated.
In short, hens with low economic value such as low-yield, sickness, etc., are widely present in every chicken farm, and most of them occur after the peak period of egg production. All chicken farms and specialized households should observe this stage regularly to facilitate the timely discovery of these non-economic value chickens. And after a period of time still need to be checked again, targeted elimination, will enable the chicken farm to obtain higher economic benefits.
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