Giannis Karvelis, g.karvelis@nuevo-group.com
In modern pig production, the concept of full value pigs constitutes the central axis of every sustainable production strategy. A full value pig is not simply heavy at the slaughterhouse; it is the pig that converts its genetic and nutritional potential into a commercially exploitable carcass, with a high percentage of lean meat (LM), correct tissue distribution and, above all, classification in the higher quality grades (S and E).
It should be emphasized that the data analysis presented below refers to production conditions and carcass weight ranges that were lower than those observed today, as modern production realities have changed significantly over time. Current final carcass weights have increased substantially and are now trending toward 90 kg and beyond. Nevertheless, the fundamental impact of genetics, precision nutrition, and proper herd management remains equally (and perhaps even more) critical in achieving the ultimate objective: the production of full value pigs capable of delivering their maximum economic and biological potential.
As slaughter weights continue to increase, the importance of optimizing growth performance, feed efficiency, carcass quality, robustness, and overall production efficiency through integrated management strategies becomes even more decisive in maximizing the value generated by each animal.
The analysis of data from 8,311 carcasses (1,884 “Same Breed” and 6,427 “Mixed Genetics”) confirms that this value does not arise randomly. On the contrary, it is the result of systematic alignment of genetics, nutrition and management, with the compatibility between boar and sow playing a decisive role.
Carcass weight (DW) is a basic production indicator, but not an autonomous indicator of value. In the examined data, average live weight (LW) is practically identical between Same Breed and Mixed Genetics, a fact that isolates the difference at the level of the carcass and its composition.
The analysis clearly shows that as DW increases, LM decreases, leading to a shift in quality classification from S towards E and U. This pattern is consistent in both genetic categories and confirms a basic rule of full value pig production: increasing weight without controlling composition leads to loss of value.
The objective, therefore, is not the maximum DW, but the optimal DW within the window that ensures high LM and locking-in of the S grade.
Same Breed versus Mixed Genetics: why does the picture of the classes change?
Despite the fact that Mixed Genetics present a slightly higher average DW, Same Breed clearly outperform in the percentage of full value pigs:
• Same Breed: 81.2% S – 16.7% E – 1.9% U
• Mixed Genetics: 73.3% S – 23.9% E – 2.6% U
The difference of almost 8 percentage points in the S class cannot be ignored. For the producer and the slaughterhouse, this difference translates into more stable commercial performance, lower penalties and higher raw material utilization.
The explanation lies – also – in genetic cohesion. When boar and sow originate from the same genetics company, the result is not simply “the same breed”, but a common ‘breeding goal’ philosophy: balance between growth rate, fat thickness, muscle depth and carcass efficiency.
This cohesion reduces variability in LM, limiting the number of animals that are marginally below the thresholds of the S class. In other words, the ‘Same Breed’ group produce more predictable full value pigs.
The role of nutrition: expression of genetics through a correct SID AA profile
Genetics set the ceiling, but nutrition determines whether and how it will be achieved. In systems aiming at full value pigs, nutrition must be absolutely aligned with the genetic profile.
A central element is the SID amino acid profile. Adequate and balanced supply of SID Lys, in correct proportion with Thr, Met+Cys, Trp, Val, Iso, Leu & His (as well as the non-essential amino acids), is critical for maintaining a high rate of protein synthesis without excessive lipogenesis. Otherwise, DW increase is accompanied by a reduction in LM and loss of quality class.
Phase feeding is an essential tool. Amino acid requirements are not constant throughout the fattening period. Failure to adapt diets per phase leads either to nutrient wastage or to protein underfeeding at critical stages, with direct impact on carcass quality.
At the same time, in units with a strong tendency for DW increase at the expense of LM, the application of restricted feeding at the final stages can act correctively. Not as a cost-reduction measure, but as a tool to control fat deposition and stabilize the S class.
Management: the unseen factor of full value pigs
Even with excellent genetics and nutrition, Management can negate or enhance the final result. Proper selection of animals for slaughter is critical. Sending overweight pigs, especially in heterogeneous batches, disproportionately increases the percentage of E and U. Proper loading, stress reduction and minimization of losses before the slaughterhouse indirectly but substantially affect performance and classification. An animal that loses weight or shows increased fatigue
before slaughter ceases to be a full value pig, regardless of genetics. In addition, management of uniformity within the barn (sorting, regrouping where required) contributes to reducing DW and LM variability, a factor critical for a stable S percentage.
The essential trade-off: kilos or value?
The data confirm that ‘Mixed Genetics’ can “deliver kilos”. However, part of these kilos does not translate into value, as it is accompanied by downgrading of quality class.
In contrast, ‘Same Breed’, with (perhaps) lower average DW but higher and more stable LM, produce more full value pigs. The strategic question for every modern unit is not which genetics grow heavier animals, but which genetics, combined with proper nutrition and management, maximize the percentage of commercially exploitable carcasses.
Conclusion
Quality classification is not a random outcome, but a reflection of an integrated production system. The close relationship between DW and LM makes it clear that value lies in balance and not in excess. The choice of boar and sow from the same genetics company creates the conditions for a higher percentage of full value pigs, reduced variability and predictable outcome. When this genetic base is supported by a correct SID AA profile, targeted phase feeding, controlled restricted feeding where required and proper management up to loading, production shifts from “kilos at the slaughterhouse” to real commercial value. And this, ultimately, is the objective of modern pig production.