{"id":18214,"date":"2026-05-25T08:43:53","date_gmt":"2026-05-25T01:43:53","guid":{"rendered":"https:\/\/www.vietstock.org\/?p=18214"},"modified":"2026-05-21T12:49:38","modified_gmt":"2026-05-21T05:49:38","slug":"broiler-fcr-adg-key-factors","status":"publish","type":"post","link":"https:\/\/www.vietstock.org\/en\/industry-news\/broiler-fcr-adg-key-factors\/","title":{"rendered":"Broiler FCR 1.6 and ADG 70g: How to Achieve It"},"content":{"rendered":"

Achieving an FCR of 1.6 and ADG of 70 g in Broilers: An Analysis of 8 Decisive Factors<\/b><\/h1>\n
\"Broiler
Broiler broilers need to be well controlled in terms of breed, feed, density, temperature, and flock health to improve ADG and FCR in each litter.<\/figcaption><\/figure>\n

In broiler farming, FCR and ADG are two technical indicators that directly affect the economic performance of each production cycle. Farms that manage these two indicators well usually gain an advantage in feed costs, rearing time, and annual flock turnover.<\/span><\/p>\n

A low FCR helps reduce the amount of feed needed to produce 1 kg of weight gain. Meanwhile, a high ADG shows that the flock is growing well, reaching market weight faster and helping optimize barn usage time. However, an FCR of 1.6 and an ADG of around 70 g\/day are technical targets under good management conditions. They are not easy numbers to achieve on every farm.<\/span><\/p>\n

What Are ADG and FCR? Why FCR 1.6 and ADG 70 g Are Key Broiler Performance Targets<\/b><\/h2>\n

Definition of ADG and how to calculate it for broilers<\/b><\/h3>\n

ADG \u2014 Average Daily Gain \u2014 measures the average body weight gained by a broiler each day during the rearing period.<\/span><\/p>\n

Reference formula:<\/span><\/p>\n

ADG (g\/day) = (Body weight at weighing time \u2013 Body weight on day 0) \u00f7 Age in days<\/span><\/p>\n

Example: A broiler reaches 2,800 g on day 42, starting from 42 g at one day old.<\/span><\/p>\n

ADG = (2,800 \u2013 42) \u00f7 42 \u2248 65.7 g\/day.<\/span><\/p>\n

This means that if a broiler reaches 2,800 g on day 42, its average ADG has not yet reached 70 g\/day using this calculation method. To reach an ADG of around 70 g\/day by day 42, the final body weight usually needs to approach around 3,000 g, depending on breed line, sex, rearing conditions, and the calculation method used in each technical document.<\/span><\/p>\n

ADG is not fixed throughout the production cycle. During the brooding stage in weeks 1\u20132, broilers usually grow more slowly. Growth is very strong in weeks 3\u20134, and then the growth rate may change during the finishing stage depending on barn conditions, feed, and flock health.<\/span><\/p>\n

What is FCR and what does FCR 1.6 mean economically?<\/b><\/h3>\n

FCR \u2014 Feed Conversion Ratio \u2014 is the amount of feed consumed to produce 1 kg of weight gain.<\/span><\/p>\n

Formula:<\/span><\/p>\n

FCR = Total feed consumed (kg) \u00f7 Total weight gain (kg)<\/span><\/p>\n

The lower the FCR, the better the feed conversion efficiency. When compound feed prices fluctuate with the market, a 0.2-point difference in FCR, for example from 1.8 down to 1.6, is equal to saving around 200 g of feed for every 1 kg of weight gain.<\/span><\/p>\n

For each broiler that gains around 2.0\u20132.8 kg, the amount of feed saved may be around 400\u2013560 g per bird. When multiplied by thousands or tens of thousands of birds per cycle, this saving can create a significant difference in production costs. However, the actual saving still depends on feed price, mortality rate, market weight, and the management quality of each farm.<\/span><\/p>\n

An FCR of around 1.6 at approximately day 42 is a target supported by technical documents for some modern commercial broiler lines such as Ross 308 and Cobb500, when the flock is raised under good management, nutrition, environmental, and health conditions. This is an achievable target under optimal conditions, but it should not be treated as an easy standard for every farm scale.<\/span><\/p>\n

Ideal Broiler Growth Rate Targets by Age Stage<\/b><\/h2>\n

The table below summarizes reference ADG and body weight targets for broilers. Farmers should compare these figures with the specific Performance Objectives of the breed line they are using, because Ross 308, Cobb500, Hubbard, or other commercial lines may have different growth curves and FCR targets.<\/span><\/p>\n\n\n\n\n\n\n\n
Stage<\/b><\/td>\nRearing week<\/b><\/td>\nReference target ADG<\/b><\/td>\nTarget body weight at the end of the stage<\/b><\/td>\n<\/tr>\n
Brooding<\/span><\/td>\nWeeks 1\u20132<\/span><\/td>\n25\u201340 g\/day<\/span><\/td>\nAround 500\u2013570 g<\/span><\/td>\n<\/tr>\n
Growth<\/span><\/td>\nWeeks 3\u20134<\/span><\/td>\n70\u201390 g\/day<\/span><\/td>\nAround 1,600\u20131,800 g<\/span><\/td>\n<\/tr>\n
Finishing<\/span><\/td>\nWeeks 5\u20136<\/span><\/td>\n75\u2013100 g\/day<\/span><\/td>\nAround 2,800\u20133,000 g or higher<\/span><\/td>\n<\/tr>\n
Full cycle<\/span><\/td>\nDay 1\u201342<\/span><\/td>\nAround 66\u201370+ g\/day<\/span><\/td>\nAround 2,800\u20133,000 g or higher<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Weeks 3\u20134 are usually the strongest growth stage in the production cycle and contribute greatly to total flock weight gain. If broilers lose growth momentum during this period, it is often difficult to fully compensate later, and FCR may increase as a result.<\/span><\/p>\n

Where Are Broiler Performance Indicators in Vietnam Compared with the FCR 1.6 and ADG 70 g Targets?<\/b><\/h2>\n

Based on practical observations from some domestic farms, smallholder and medium-scale farms in Vietnam may still show a significant gap compared with the optimal targets of modern commercial broiler lines. The figures below are for reference only. Official statistics need to be confirmed through the latest industry reports from the Ministry of Agriculture and Environment or livestock research organizations.<\/span><\/p>\n\n\n\n\n\n\n\n
Indicator<\/b><\/td>\nCommonly observed level at some farms<\/b><\/td>\nReference optimal target<\/b><\/td>\nGap<\/b><\/td>\n<\/tr>\n
Full-cycle ADG<\/span><\/td>\n40\u201355 g\/day<\/span><\/td>\nAround 66\u201370+ g\/day<\/span><\/td>\nSignificantly lower<\/span><\/td>\n<\/tr>\n
Full-cycle FCR<\/span><\/td>\n1.9\u20132.2<\/span><\/td>\nAround 1.6 under optimal conditions<\/span><\/td>\nHigher by 0.3\u20130.6 points<\/span><\/td>\n<\/tr>\n
Market weight on day 42<\/span><\/td>\n1.8\u20132.3 kg<\/span><\/td>\n2.8\u20133.0 kg or higher<\/span><\/td>\nSignificantly lower<\/span><\/td>\n<\/tr>\n
Mortality rate<\/span><\/td>\n5\u20138%<\/span><\/td>\nBelow 3% under good management conditions<\/span><\/td>\nHigher by 2\u20135 percentage points<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

This gap does not necessarily come from the genetic potential of the breed, because many farms already use commercial broiler lines. However, chick quality, environmental management, feed quality, disease prevention programs, and operating skills remain decisive factors in actual performance.<\/span><\/p>\n

8 Decisive Factors for Achieving FCR 1.6 and ADG 70 g in Broilers<\/b><\/h2>\n
\"Broiler
Feeding density, feeding system, ventilation, and barn conditions directly affect the ADG, FCR, and growth efficiency of broiler broilers.<\/figcaption><\/figure>\n

Factor 1: Genetic quality and choosing fast-growing broiler lines<\/b><\/h3>\n

Breed is a foundational factor because genetic potential determines the \u201cceiling\u201d of growth and feed conversion efficiency that a farm can achieve. Modern commercial broiler lines such as Ross 308, Cobb500, and Hubbard Flex are all selected for strong ADG and feed conversion performance under well-controlled conditions according to the breeder\u2019s guidelines.<\/span><\/p>\n

However, chick quality at delivery is the factor that farmers can directly control. One-day-old chicks need to meet basic criteria such as body weight appropriate for the breed line, dry and well-healed navels, evenly fluffed feathers, active response, no signs of dehydration, and good uniformity among individuals.<\/span><\/p>\n

Weak chicks from the start often pull down ADG for the entire cycle, even if later care is good. In addition, parent flock age can affect chick weight, vitality, and uniformity. Farmers should check parent flock information, hatchery quality, transport conditions, and one-day-old chick quality indicators according to the breeder\u2019s recommendations.<\/span><\/p>\n

Factor 2: Feed formula optimized by stage and input ingredient quality<\/b><\/h3>\n

Feed directly affects both ADG and FCR. A stage-based feeding program \u2014 starter, grower, and finisher \u2014 with nutrient density adjusted by age is a basic foundation of commercial broiler farming.<\/span><\/p>\n

Reference nutrient levels:<\/span><\/p>\n\n\n\n\n\n\n
Stage<\/b><\/td>\nAge<\/b><\/td>\nReference crude protein<\/b><\/td>\nReference metabolizable energy<\/b><\/td>\n<\/tr>\n
Starter<\/span><\/td>\n0\u201310 days<\/span><\/td>\nAround 22\u201323%<\/span><\/td>\nAround 2,975\u20133,000 kcal\/kg<\/span><\/td>\n<\/tr>\n
Grower<\/span><\/td>\n11\u201324 days<\/span><\/td>\nAround 21\u201321.5%<\/span><\/td>\nAround 3,050 kcal\/kg<\/span><\/td>\n<\/tr>\n
Finisher<\/span><\/td>\nFrom day 25 to market age<\/span><\/td>\nAround 19\u201320%<\/span><\/td>\nAround 3,100 kcal\/kg<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

The figures above are for reference only. Exact recommendations should be compared with the technical documents of the breed line, target market weight, ingredient conditions, and advice from a nutrition specialist.<\/span><\/p>\n

Nutrient levels in a formula are only meaningful when input ingredients are of good quality. High-moisture corn, oxidized soybean meal, low-quality fishmeal, or mold-contaminated ingredients can all reduce actual digestibility, causing FCR to increase even when the formula looks correct on paper.<\/span><\/p>\n

Feed form also has a significant impact. Pelleted feed usually helps reduce waste and supports better intake than mash feed, if pellet quality, pellet durability, and size are suitable for each age stage.<\/span><\/p>\n

Factor 3: Stocking density management and barn design suited to Vietnam\u2019s climate<\/b><\/h3>\n

Overstocking is one of the common reasons ADG decreases and FCR increases. When broilers are overcrowded, competition for feed and water increases, heat stress rises, air quality declines, and growth is directly affected.<\/span><\/p>\n

Broiler stocking density should not be calculated only by birds per square meter. It also needs to consider kg live weight per square meter. For example, 15 birds\/m\u00b2 at 1.8 kg is very different from 15 birds\/m\u00b2 at 2.8\u20133.0 kg. Therefore, 8\u201315 birds\/m\u00b2 should only be treated as an initial reference.<\/span><\/p>\n

In Vietnam\u2019s hot and humid climate, the following ranges may be used for reference:<\/span><\/p>\n\n\n\n\n\n\n
Barn type<\/b><\/td>\nReference stocking density<\/b><\/td>\n<\/tr>\n
Open or semi-closed barn<\/span><\/td>\nAround 8\u201310 birds\/m\u00b2<\/span><\/td>\n<\/tr>\n
Closed barn with good ventilation and cooling<\/span><\/td>\nAround 12\u201315 birds\/m\u00b2, depending on market weight<\/span><\/td>\n<\/tr>\n
Peak hot season<\/span><\/td>\nDensity should be reduced or ventilation\/cooling capacity should be increased<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

A suitable density depends on barn type, ventilation system, season, market weight, number of feeding and drinking points, and animal welfare requirements.<\/span><\/p>\n

Barn design should prioritize reducing radiant heat, ensuring ventilation, controlling harmful gases such as NH\u2083, and providing enough access points for feed and water according to equipment manufacturer recommendations.<\/span><\/p>\n

Factor 4: Temperature, humidity, and ventilation control<\/b><\/h3>\n

Broilers are highly sensitive to temperature, especially in hot and humid climates. When temperatures exceed the comfort zone, broilers reduce feed intake, pant more, move less, and are more likely to experience heat stress. The direct result is lower ADG and higher FCR.<\/span><\/p>\n

The temperature table below is only a reference. Farmers should compare it with the specific guidelines of the breed line, barn type, humidity, wind speed, and flock behavior.<\/span><\/p>\n\n\n\n\n\n\n\n
Rearing week<\/b><\/td>\nReference barn temperature<\/b><\/td>\n<\/tr>\n
Week 1<\/span><\/td>\n32\u201334\u00b0C<\/span><\/td>\n<\/tr>\n
Week 2<\/span><\/td>\n29\u201332\u00b0C<\/span><\/td>\n<\/tr>\n
Week 3<\/span><\/td>\n26\u201329\u00b0C<\/span><\/td>\n<\/tr>\n
Week 4 onward<\/span><\/td>\nGradually reduce according to age, with priority given to keeping the flock within its thermal comfort zone<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Humidity should usually be maintained at around 60\u201370%. High humidity combined with high temperature makes heat stress more serious than high temperature alone.<\/span><\/p>\n

In closed barns, mechanical ventilation and evaporative cooling systems are often considered from the stage when broilers begin growing rapidly. However, the effectiveness of evaporative cooling depends on ambient humidity, wind speed, stocking density, and barn design. In open barns, forced fans, curtains, insulated roofing, and density management can help reduce heat stress during hot seasons.<\/span><\/p>\n

Factor 5: Vaccination programs, disease control, and biosecurity<\/b><\/h3>\n

Disease directly affects ADG. Even when broilers do not die, subclinical conditions caused by coccidiosis, Mycoplasma, mild Newcastle disease, or gut health problems can still reduce weight gain and worsen FCR.<\/span><\/p>\n

A disease prevention program should include:<\/span><\/p>\n