Duck uniformity refers to the percentage of ducks whose body weight is distributed within 10% of the average body weight and the total number of ducks. The uniformity of the duck will directly affect the speed of egg production after the duck, the duration of the peak duration of the production, the overall egg production rate, the consistency of the egg weight and the number of dead birds during the laying period. . Therefore, for a long time it has been the problem most concerned by duck farmers. To achieve a good uniformity of bred ducks, the following measures must be taken.
Duckling selection
To select a healthy duck seedling with relatively uniform shell weight and relatively consistent shelling time.
Reasonable breeding density
Reasonable rearing density is a necessary condition for ensuring the health and growth of ducks. If the rearing density is high, the air in the house is dirty, the ammonia smell is large, the humidity is high, and hygiene is poor. The number of breeding per square meter was 0-day-age -50 days old, -60, and 8-day-age -14-day-old 30 - 40. The bred ducks each have at least 0.3 square meters of housing area and 0.3 square meters of playground area; each group should have 300 animals.
Weighing
Ducklings enter the broiler house and they must weigh their first birth. They are weighed at least once a week. Weighing ratio of not less than 10%, said the important fixed-point, timing, set people. After weighing, the average weight and uniformity of body weight for each lap, each block, and the entire group are accurately calculated; the weight uniformity is calculated by using the standard weight and the actual average weight of 5%, respectively, and the weight and evenness of the duck group are accordingly calculated. Make the right assessment. According to the weighing results, the amount of feed for the next week was carefully and carefully approved. Feeding ducks was moderately limited, and the ducklings were given more feed so that the ducks had a good overall uniformity.
Correct grouping and clustering
When the 14-day-age and the duck population uniformity were too bad, the whole group was weighed and divided into large, medium, and small groups according to the standard body weight. The weight of the duck was adjusted by adjusting the feeding amount. It is best to weigh once every 3 days. Put the weight of the large and small groups into the middle group. Put the large groups in the middle group into the large group, and place the under group in the small group, so that the number of ducks in the group is getting more and more. More, thereby increasing the uniformity.
Through eye and hand touch, the diseased, weak and ducklings were raised in isolation and given special care. They were placed in a cage with a slightly higher temperature and better light to facilitate the intake of drinking water and promote its rapid growth. Reduce their stocking density, dietary supplements of vitamins and minerals, and can be supplemented with antibiotics to prevent disease. According to male and female grouping, under normal circumstances, the male duck grows faster and the female duck grows more slowly. If the male and female are raised in a polyculture, the male duck has strong physical strength and bullies the weak mother duck and competes for food and grabs it. In this way, the weight difference between the male and female ducks will increase, and there will be a difference in gender uniformity. After grouping by male and female, if there is a difference between the individuals in the same-sex duck population, they can be sorted by size. In this way, the uniformity of ducks of the same sex can be improved.
Each duck house establishes a special mobile small circle as a small female duck circle. Each day, the small female ducks with a small visual acuity in the large group are individually picked into the small female duck circle for individual feeding, and the ducks are made of a relatively easy-to-recognize color. Markers, ducks should be put back into large groups in time after each single supplement. This work is repeated until their weight reaches the standard.
It should be noted that when the uniformity and weight condition are not too bad, it is better not to weigh and group the entire population, which will cause great changes in the group order. This is particularly to be avoided in the rearing of ducks, especially ducks should pay attention to prevent the emergence of this problem.
Adequate picking and drinking levels
Set up enough troughs and troughs so that each duck has a slot and drinking position to ensure that ducks can feed and drink water at all times. The ratio of sinks and troughs is generally 2:1.
Ageing management
The resistance of ducks to stress during the rearing period is further strengthened, and the bones and muscles develop rapidly. Especially for large fast ducks, they eat fast and grow fast. During this period, the uniformity can be quickly and well controlled through limited feeding. . In order to increase its uniformity during this period of time, it is important to pay attention to the following aspects: Accurately grasp the number of ducks. Feeding is fast, uniform and accurate. Adjust the ducks in time. For ducks between 6 weeks and 7 weeks of age, strict restriction of feed should not be adopted, as long as they can reach the standard body weight; for 8 weeks to 11 weeks of age, restriction can be adopted; for 12 weeks Ducks of age -16 weeks must adopt a strict dietary regimen, with weight control below 5% of target weight.
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