Growth control can be achieved by directly adjusting animal feed intake,
reducing lighting time (indirectly limiting feed intake), or reducing
the nutrient content of the feed. These methods are especially useful
for heavy broilers (> 2.5 kg) where the initial slow growth rate
(cob-foot problem; Blisters(poor litter management) Hock/shank
deformity) is beneficial for lifetime production. Growth should be
controlled so that the stock is slightly below genetic potential in the
first 3 weeks. This is primarily for the Cobb hybrid. But lately, Ross
has a serious problem with leg problems, so it's important that you
don't gain extra weight during the first three weeks. The growth control
program can only be successfully applied to a well-performing,
homogeneous broiler flock that has reached its first week target weight
thanks to good management techniques.
Like other biological systems, broiler flocks have a normal weight distribution. Population variability can be determined by the coefficient of variation (CV%). This is a percentage formula for mean weight fluctuation (Standard Deviation) in a flock. Scattered flocks have a high coefficient of variation, and uniform flocks have a low coefficient of variation. The weight of each gender is normal, but the standard deviation of mixed genders is large. From the standard deviation percentage, you can predict how high the number of broilers associated with mean or weight will be. As a result, a significant improvement in homogeneity can only be achieved by fattening the sex-separated flocks. The smaller the standard deviation of the flock. The more uniform the flock, the more broilers will achieve the expected weight.
At the same time, even with a standard deviation of 8%, only 58% of broilers reach sufficient weight for the narrowest weight group (1800-2000g) Understanding the effects of biological variability is the basis of effective processing plant design. Gender-segregated farming is most effective when males and females are bred in separate enclosures to ensure the most effective techniques for feeding, lighting and flock density. Another advantage of sex segregation fattening is that it can meet the different nutritional needs of gender. Cock grow faster, have higher feed conversion ratios, and have less fat than Hen. Increasing the ratio of protein to energy has a significant impact on growth compared to Hen. Accurate information on flock weight and uniformity is essential to adjust the treatment age so that as many broilers as possible reach the desired weight class after treatment. Prediction of weight gain for 4-5 days is inaccurate due to increased growth rate and shorter fattening period. Weigh a large number of broilers (100+) in the flock several times within 2 days prior to treatment for more accurate pretreatment weight estimation and prediction. If feed and nutrient intake is regulated, or if you use a lighting program to plan the weight of your finished product, you should monitor the broiler's response to changes in management techniques and also check the weight. The flock can be measured using mechanical (conventional handheld) and automatic cleaning compositions. Check all unexpected weight changes. While you are using hand, weigh a weekly body weight. There are companies in which Five-day weighing is used.
Occasionally we have to measure at least 1% of 34 flocks of each house. The automatic weighing system (equipment) can also be used for accurate and continuous weighing. These scales are placed in a place where birds gather in large numbers and stay long enough to fix their weight. Older and heavier cocks are less likely to use automatic scales and can reduce the average weight of the flock. Automatic scales and recorded data are checked regularly and verified by manual weighing at least once a week.
Author: Aiyedun, Lateef Ayodeji
Date: 27th February, 2022.
Zsolt, Hankovszky. (2018) . PRACTICAL BROILER MANAGEMENT MANUAL,
(eds.). Győr in Illés Press.