The birth weight reflects the physique of the reserve chickens. In the traditional concept, the greater the weight at the start of labor, the better the physique and the higher the production performance. So, to what extent is the weight at the start of production, and the chickens can give full play to the best production performance? The Breeder Breeding Technology Center (Beijing) of Yukou Poultry Research Institute, through a series of studies, has revealed the secret of the relationship between laying breeder start weight and egg laying performance throughout the process.
First, based on the standard body weight (1320 g) of Jingfen No. 1 parental layer breeder at the end of 19 weeks, with 70 g as the grouping gradient, they were divided into 6 groups, each with 3 replicates, each with 96 chickens , The weight of each group of chickens meets the grouping requirements:
Subsequently, 6 groups of chickens were raised in the same house and under the same environmental conditions. Continue to observe the production performance of 20-63 weeks of age, and record the age at the start of laying, the age at the peak of laying, the number of dead eggs per day, the number of eggs laid per day, and the average egg weight of each group of chickens.
Finally, using a one-way analysis of variance method, statistical analysis of the data of each group of 20-63 weeks old, the results prove:
1. Excessive weight at the start of labor will cause chicken obesity, and prolapse of the anus at the start of labor, which will increase death during the whole process.
The death rate of chicken flocks with a body weight exceeding 140 grams above the standard was the highest, reaching 6.25%, which was significantly higher than that of other groups. 80% of them were prolapsed, and the death rate of other groups was 1%-3%.
2. The greater the weight at the start of production, the more the energy reserves of the chicken body and the stronger the ability to continue laying eggs during the laying period
Flocks with an initial weight exceeding 140 grams have the highest daily egg production rate, exceeding the standard by 4.9%; chickens with an initial weight exceeding 71-140 grams have the second highest egg production rate, exceeding the standard by 2.8%; The egg production rate of chickens whose body weight is more than 140 grams is the lowest, 0.2% below the standard.
3. The weight at the start of production has a strong correlation with the average egg weight throughout the process. The greater the weight, the greater the egg weight throughout the process.
The flocks with an initial production weight exceeding 140 grams have the largest egg weight, with an average egg weight of 60.7 grams throughout the process; the chickens with an initial production weight exceeding the standard 71-140 grams are followed, with an average egg weight of 60.6 grams; The average egg weight of chickens with a standard weight of 140 grams or more is 59.2g.
4. When the birth weight exceeds the standard weight of 71-140 grams, the yield index of the house chicken is the best
Flocks with a body weight of over 140 grams above the standard will yield 245.7 chickens per unit during the whole process, which is 7.2 chickens above the standard;
Flocks with a body weight exceeding the standard of 71-140 grams have the highest yield per unit, reaching 252 chickens and 13.5 chickens exceeding the standard;
The yield per unit of chickens below the standard weight reaches the standard number.
To sum up, Jingfen No. 1 layer breeder starts to produce 71-140 grams of over-standard weight, which can ensure that the chicken population can be fully stocked, and it will not cause prolapse due to obesity of the chickens. It can achieve the yield index for the whole process. To maximize.
Therefore, it is recommended that layer breeders do not blindly pursue the weight of the chicken group. According to the characteristics of the breed, through good feeding management and feed nutrition control, the chicken group should be cultivated to a suitable weight range while improving the weight uniformity. In order to achieve full production performance and maximize economic benefits.