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of live weight gain before slaughter. These percentage increases in fat-free lean gain are consistent among slaughter weight ranges from 220 to 280 lbs. The percentage lean growth responses to Paylean are consistent across genotypes with different lean growth potentials. Two studies consisting of seven genotypes with substantially different lean growth rates fed 20 ppm Paylean resulted in a consistent 34% increase in lean gain regardless of genotype. Therefore, greater Paylean lean growth responses will occur in pigs of high lean growth genotypes.
For example, nutritional programs must be evaluated as muscle growth is increased, as additional nutrients (i. e. , protein, minerals, vitamins) are required to fuel the enhanced rates of muscle accretion. It should also be pointed out that environmental factors which reduce pig growth are more deleterious to higher lean growth genotypes because these factors (i. e. , health status, social stress) decrease muscle tissue growth to a greater degree than fat tissue growth.
Faster growth rates, more efficient feed conversion and increased carcass leanness create economic advantages for producing high lean growth genotype pigs. Differences in lean growth potential result in differences in amino acid requirements, especially lysine. The lean growth rates of pigs of various genotypes can be identified and used to determine their protein and lysine requirements. A procedure to determine lean gain for pigs is presented in the Appendix.
The industry has adapted to this through increased use of lean genotype breeding animals and terminal mating systems for the production of high lean content market barrows and gilts. Consequently, the objective in diet formulation for growing-finishing hogs is to optimize lean tissue growth rather than simply live weight gain. To achieve optimum performance, high lean gain genotypes.
In general, making feed on the farm for young (2 to 4 weeks of age), light starter pigs should be discouraged. Proper diets for the young starter pig are typically more complex (containing whey, fish meal, dried skim milk, blood meal, blood plasma, synthetic amino acids, etc. ) and usually give the best results when fed in pellet form. However, the amount of these expensive complex starter feeds fed should be carefully budgeted and controlled to avoid excessive feed costs. Also, producers should be aware that when making sow feeds on the farm with commercial complete supplements, base mixes, or premixes, the manufacturer directions may indicate that a separate "sow add pack" be included to meet all the nutrient needs of gestating or lactating sows or a special "lean hog pack" for market hogs known to be of a high lean growth genotype.