Performance Changes for Growth and Meat Production of Pigs under Restricted and Full Feeding with Selection

Suzuki, Keiichi; Ujiie, Satoshi; Asano, Yasuo

doi:10.2508/chikusan.60.246

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“…Performance tests for Duroc pigs were started at 28.21–36.43 kg (average 30.48 kg) and finished at 89.14–96.35 kg (average 92.01 kg), while performance tests for Landrace pigs were started at 27.92–35.24 kg (average 30.16 kg) and finished at 88.42–93.52 kg (average 91.33 kg). All pigs were fed ad libitum , except the Landrace boars were provided restricted feed, since the genetic correlation between DG and BF was negative on restricted feeding and positive on ad libitum feeding for Landrace pigs (Suzuki et al . 1989).…”

Section: Methodsmentioning

confidence: 99%

Genetic parameters for production traits and measures of residual feed intake in Duroc and Landrace pigs

Hoque

Suzuki

2008

Animal Science Journal

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Data on 380 Duroc boars from seven generations, and 1026 Landrace pigs (341 boars and 685 gilts) from six generations were used to estimate genetic parameters for daily gain (DG), backfat thickness (BF), metabolic weight (MWT), daily feed intake (FI), feed conversion ratio (FCR) and residual feed intake (RFI). Two measures of RFI were estimated as the difference between actual feed intake and that predicted from models that included initial test age and weight and DG (RFI1); and initial test age and weight, DG and BF (RFI2). Heritability estimates for DG, MWT and FI were moderate for both breeds. BF estimates were high for both the breeds. The measures of feed efficiency (FCR and RFI) were moderately heritable. Genetic correlations of BF with measures of RFI were stronger when BF was not included in the estimation of RFI (0.40 and 0.46 for Duroc and Landrace, respectively (for RFI1), compared with 0.05 and 0.06 for Duroc and Landrace, respectively (for RFI2)). Genetic correlations of MWT with measures of RFI were all negative and low. Genetic and phenotypic correlations between DG and measures of RFI were close to zero, which indicated that selection for reduced RFI could be made without adversely affecting DG. BF should also decrease, and MWT should increase under selection for reduced RFI. The reduction in BF would depend on the measure of RFI used.Animal Science Journal (2008) 79, 543-549 BF, backfat thickness; DG, daily gain; FCR, feed conversion ratio; FI, daily feed intake; MWT, metabolic body weight; RFI1, residual feed intake estimated from model that included initial test age and weight, and daily gain; RFI2, residual feed intake estimated from model that included initial test age and weight, daily gain and backfat. 546 M. A. HOQUE and K. SUZUKI

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Section: Methodsmentioning

confidence: 99%