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Simulation of Genetic Changes in Life Cycle Efficiency of Pork Production, II. Effects of Components on Efficiency¹

University of Nebraska and US Department of Agriculture, Lincoln, Nebraska 68583-0908

Abstract

A deterministic, bioeconomic computer model of pork production was used to predict effects on input/output efficiency (Hi) from increased conception rate (CR), number born alive (NBA), milk potential (MK), preweaning viability (VIAB), growth rate (GR)and lean growth rate (LGR) and from decreased age at puberty (-PUB), percentage fat at 100 kg (-%F) and fat growth rate (-FGR). Independent changes in the genetic means of each trait were used to simulate effects on feed ME (metabolizable energy) Mcal/kg carcass lean (H₁), ME Mcal/kg empty body weight (H₂), cost/100 kg carcass lean (H₃) and cost/100 kg live weight (H₄) under a continuous farrowing system with weaning at 28 d and marketing at 100 kg live wt. Relative values for traits in selection index construction expressed as percentage change in H₁ H₂, H₃ and H₄, respectively, per genetic standard deviation of change in each trait were.- -.6, -.6, -.8, -.7 for -PUB; -.6, -.6, -1.5, -1.5 for NBA;-.7, -.6, -1.6, -1.5 for VIAB; -1.4, -.7, -.9, -.2 for GR; -3.8, -.7, -2.7, +.4 for -%F; -2.5, -.8, -1.7, 0 for LGR and -2.0, -.2, -1.3, +.5 for -FGR. Importance of GR, -%F, LGR, -FGR depends on price recognition of lean yield. Importance of NBA and VIAB was much greater for economic than for biological efficiency. Increased MK was useful only to realize maximum benefit from large increases in NBA, VIAB or GR. Responses of H_i per phenotypic standard deviation of change in each trait emphasized the great importance of NBA and VIAB levels for biological (H₁ and H₂) and especially for economic (H₃ and H₄) efficiency.

¹ Published as Paper No. 6730, Journal Ser., Nebraska Agr. Exp. Sta., Lincoln. Partial publication from senior author's Ph.D. dissertation.

² Graduate Assistant, Dept. of Anim. Sci., Univ. of Nebraska-Lincoln. Present address: Dept. of Anim. Sci., North Carolina State Univ., Raleigh 27650.

³ Postdoctoral Research Associate, Dept. of Anim. Sci., Univ. of Nebraska-Lincoln. Present address: Ruakura Anim. Res. Sta., Ministry of Agr. and Fisheries, Hamilton, New Zealand.

⁴ Roman L. Hruska US Meat Animal Research Center, ARS, USDA, 225 Marvel Baker Hall, Univ. of Nebraska, Lincoln 68583-0908.

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