High-yielding layer chicken selection
The chicken farmer timely eliminates low-yielding chickens and discontinued chickens, and selects high-producing laying hens to avoid feed wastage and improve breeding efficiency. The most accurate method for identifying low-yield chickens and high-yielding chickens is based on the individual egg production records of the hens, but it is difficult for most chicken farms and chicken-rearing specialists to spend time and labor. Generally, according to the appearance and physiological characteristics of hens, high-yield laying hens can be selected through the intuitive method of “a listening, three touches, ten readings,†during daily breeding.
Listen
The so-called "listening" is to hear the sound of chickens. The high-yield chickens are loud and even and uniform. When they touch, the wings of the chickens are tight and appear to be particularly amiable, and they give out a giggle. The low-yield chickens generally do not call and find abnormal animals and other small animals to the chicken farm and yell immediately. The flock of chickens were frightened and "flocked". When touched, they were panic-stricken and squeaked. In addition, chickens that lay more eggs do not love to hug nests; chickens that lay fewer eggs like hugs.
Three touch
Touching the chicken crown with a touch of the chicken crown, the high-yielding chicken feels soft and warm, and the skin has elasticity; the low-yielding chicken feels rough and hard, the crown and flesh are not warm, and the skin is inelastic.
Two high-producing pubis chickens have large pubic bone gaps and generally accommodate 3 to 4 fingers. The phalanges are straight, soft, thin, and flexible. The distance from the end of the sternum to the pubic bone can accommodate a horizontal palm; the pubic bone spacing of chickens is discontinued. Small, can only accommodate 1 ~ 2 fingers, the pubic bone between the inward bending, hard and thick, the distance from the end of the sternum to the pubic bone is only half the width of the palm and even half of the palm not to.
Three-touch high-yielding chickens in the abdomen are swollen and soft in the belly during the laying period, and the skin is loose. At this time, the keel is lowered, the distance between the keel and the pubis is increased, and the length of the abdomen is 7 cm to 8 cm; the abdomen is cut off and is small, hard and abdomen. Only 4 cm to 5 cm long.
Ten look
A look at the growth and development of high-yielding chickens normal growth and development, healthy condition, tame temperament, lively and active, strong foraging ability; low-yielding chicken body condition is too fat or too thin, timid afraid of panic, poor feeding ability.
Secondly, the high-yielding chickens in the chicken's crown have large, ruddy, elastic, and low-yielding chickens or discontinued chickens have small, shrunken crowns and pale, pale, dry and dull colors.
Thirdly, the high-yield chickens in chickens are short, wide and slightly curved; the low-yielding chickens are fine, small, narrow and straight, like crow's beaks.
Four to see the high yield of corn eyes round, large and divine; low-yield corn eyes oval, eyes dull.
Five to see anal high-yield chicken anal muscle plump, moist, large and oval-shaped, relaxation of contractus muscle, elastic contraction around the flexor muscle, and immediately contraction, out of sticky secretions, and the wide distance between the feet; low yield The chicken's anal folds, the inside is dry, small and round, and the contraction is tight, and the distance between the feet is narrow.
Sixth, the high-yielding chicken breasts on the chest and back were wide and deep, protruding forward, and the keel was straight and the back was long and flat. The low-yielding chickens had shallow chests, short sternums, and narrow or short sternums, short or hunched backs.
Seven see abdomen high-yield chicken abdominal volume; stop production of chicken abdominal volume is smaller.
Eight see layer yellow skin of laying hens, with the increase in egg production, yellow pigment fade, the order of the beginning of the anus, after the eye, ear, iliac, feet and toes gradually retreat. Therefore, high-yielding chickens fade quickly; low-yielding or discontinued chickens fade slowly or remain yellow.
Nine to see the feathers of high-yield chickens for a period of time, the feathers are rough, dry, late for feathers, generally in the late autumn or early winter, and moult quickly, stop production time is short, and even the whole winter is not moult, or only for one The batch of feathers is stopped for a short period of time. When the temperature rises, the light increases, and the nutrients increase in the coming spring, the eggs are moulted. Low-producing chickens have shiny, plump, and early moults, often moulting in the late summer and early autumn, and the moults are slow and last for a long time.
Look at the excrement at night or at dawn to check chicken excrement. The feces of the high-yielding chickens are formed into many, soft, moist and small heads with a white shape; the feces of low-yielding or discontinued chickens are dry, hard and thin.
In short, farmers must observe and inspect at any time during the chicken raising process in order to obtain good economic benefits, and eliminate low-yield chickens and sick chickens in time.
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