The key to reducing the cost of fattening pigs is not to skimp on what goes into their mouths, but to turn “every mouthful of feed consumed” into “every pound of meat gained.” Feed accounts for more than 70% of total fattening costs, but what often drives up the feed-to-meat ratio is not the formula itself. It is cold stress in the pig house, overcrowding in the pens, and the “hidden waste” of a batch that should have been sent to market after 110 days but is not sent until 130 days. The following breaks down actionable opportunities to reduce fattening costs across four dimensions.
I. Precision Nutrition: Reduce the Formula, Improve Conversion Efficiency
A low-protein diet does not mean “lowering quality”; it means “balancing amino acids.” Based on a net energy system and a balance of digestible amino acids, crude protein in the later fattening stage (75—100 kilograms) can be reduced to 12%, and the soybean meal inclusion rate to 8%. After supplementing limiting amino acids such as lysine, methionine, threonine, and tryptophan, crude protein can be reduced by 2—3 percentage points without affecting production performance, saving approximately 100 yuan per ton of feed. Replacing some of the soybean meal with alternative meals is another option: rapeseed meal can be used at up to 15% in fattening pig diets, peanut meal at no more than 10%, and cottonseed meal at no more than 10%. However, monitoring for mycotoxins in replacement ingredients must also be kept up to date.
The “granularity” of phase feeding determines the upper limit on waste. Refining the traditional three-stage “small pig feed—medium pig feed—large pig feed” approach into more stages and dynamically adjusting nutrient concentrations by weight can prevent protein surplus caused by “large pigs eating small pig feed” and restricted growth caused by “small pigs eating large pig feed.” Feed-to-meat ratio targets during the fattening period should be set by stage: 15—30 kg stage 1.8—2.0:1，30—60 kg stage 2.2—2.5:1，60 kg to market weight stage 2.6—2.9:1. When comparing actual results with these ranges, if the feed-to-meat ratio remains above the upper limit over an extended period, the problem is most likely not the formula, but the environment or health.
Small improvements in feeding methods can bring substantial returns. Wet/dry feeders can increase feed intake by 8%—12% and improve the feed-to-meat ratio by about 5%. “Feed small amounts frequently” keeps feed available in the trough without leaving it there overnight, preventing feed from being pushed out of the trough or going moldy. This is the most direct way to save costs. When changing feed, a transition period of 3—7 days is essential. Gradually switch from the old feed to the new feed at 25%→50%→75%. Digestive disturbances caused by a sudden feed change can directly reduce feed conversion efficiency to zero for several days.
II. Environmental Control: Every degree of temperature deviation quietly changes the feed-to-meat ratio
The suitable temperature for finishing pigs is between 16—20°C, with humidity not exceeding 70%. Below 16°C, pigs use feed energy primarily to generate heat and keep warm rather than to deposit muscle; above 20°C, feed intake declines, followed by a drop in daily weight gain. In autumn and winter, the key to reducing costs is not “burning more coal” but “losing less heat”: sealing drafts in walls, doors, and windows; using burlap sacks or canvas as door curtains; and laying dry bedding on the floor are low-cost improvements that can effectively reduce heat loss. The small amount of heat generated by fermenting bedding is like a layer of “natural underfloor heating.” The ventilation strategy is to exchange air in short, concentrated periods during the warmest part of midday, rather than leaving small openings all day and letting heat escape continuously—the latter causes greater heat loss and, in fact, lower ventilation efficiency. Keeping ammonia concentration below 15 ppm, with no eye irritation or pungent smell when entering the pig house, is a more intuitive assessment criterion than any monitoring equipment.
Three. Density and health: overcrowding is the most insidious killer of the feed-to-meat ratio
The impact of pen space on the feed-to-meat ratio is greater than most people estimate. The recommended space for finishing pigs is 1.3—1.5 square meters per head; at normal stocking density, the feed-to-meat ratio can be maintained at 2.3—2.6. When space falls below 1 square meters per head, feed intake decreases by 5%—15%, daily weight gain falls by 10%—20%, and the time to market is extended by 10—20 days. The feed-to-meat ratio can rise to 2.8 or even above 3.0. The rise in cortisol caused by overcrowding suppresses immunity, and the incidence of respiratory disease rises from below 5% to 30%—50%. The combined treatment costs and stalled growth create a vicious cycle of “density—disease—failure to reduce costs.”
The precision of the grouping process directly affects the uniformity of the entire pen. Keep body-weight differences among pigs in the same group within 5 kilograms and age differences within 7 days. A group of 10—15 pigs is recommended, with no more than 20 pigs at most. Only when the principles of “keeping the weaker pigs, not the stronger ones” and “mixing at night, not during the day” are properly followed will weaker pigs have a secure opportunity to eat and the uniformity of market weights across the pen improve. All-in/all-out management is not just for show: leave pens empty for at least 7 days between batches, and thoroughly clean, rinse, disinfect, and dry them so the next batch of pigs can start with a stable level of health.
IV. Market-Weight Decisions and a Closed-Loop Data System: Selling at the Right Time Matters More Than Raising More
The feed-to-meat ratio is lowest when finishing pigs are marketed at 110–120 kg. Continuing to raise them beyond 130 kg increases the proportion of fat deposition, while maintenance needs continuously consume feed, making the cost of marginal weight gain increasingly high. During periods of low winter temperatures, the finishing period may be extended appropriately to take advantage of compensatory growth in pigs, but excessive weight must be avoided because it can worsen feed conversion.
Industry cost-reduction practices have demonstrated the combined effects of these factors. In 2026 9, the feed-to-meat ratio for market hogs at Juxing Agriculture & Animal Husbandry fell to 2.43, and the full cost fell to 5.96 yuan/jin. The key actions focused on the feed-to-meat ratio, average daily gain, and survival rate in the finishing stage. Through precision feeding and dynamic adjustment of environmental-control parameters, the Chengdu Regional Company of Rongtong Agriculture Development raised the full-cycle survival rate to 88%, shortened the finishing period by 20 days, and reduced the full-cycle feeding cost per pig by more than 10%. Xinwufeng, relying on precision nutrition, dynamic formulations, and low-protein diet technology, and advancing direct corn procurement and the use of alternative ingredients, reduced its overall annual farming costs by more than 15%.
Summary
The four main approaches to reducing finishing costs, ranked from greatest to least leverage: in the feed formulation, balance amino acids and refine production stages; in the environment, stabilize temperature and control ammonia; in stocking density, provide enough space and make group sizes uniform; at marketing, target the right weight and put data to use. Every reduction of 0.1 in the feed-to-meat ratio means a difference of more than ten kilograms of feed per pig; every 10-day reduction in time to market creates another round of capacity for barn turnover and fixed-cost allocation. Cost reduction is not about squeezing any one stage to its limit, but about plugging the “leaks and losses” across all four dimensions one by one. (Source: 张伟光)