Abstract

LOPEZ, Nelson  and  GALINDEZ, Rafael. Accumulated productivity at weaning in Large White, Lanandrace and Cross sows in a commercial herds. Zootecnia Trop. [online]. 2011, vol.29, n.4, pp.445-453. ISSN 0798-7269.

With the aim to evaluate the lifetime productive of Large White, Landrace sows, and reciprocal cross, 2444 records of accumulated prolifi cacy (TAD) and litter weaning weight (PAD) were analyzed. Records of sows came from a commercial herd of Yaracuy State. The data were adjusted by month, year and farrowing number. For the fi nal analysis were grouped the sows birth years in two periods: 1986-1998 and 1999-2005. We considered the sows that had the opportunity to have at least three farrowing. Variance analyses were performed using the restricted maximum likelihood procedure. Included effects in the analysis were: sow breed (GRC: 1,...,4), sow birth period (PN: 1, 2), sow birth month (MN: 1,..., 12), GRC*MN and age at fi rst farrowing as covariate. Adjusted and not adjusted averages were 31.73 and 31.70 piglets; and 222.97 kg and 222.76 kg for TAD and PAD, respectively. The sows of breed LR*LW (34.29 piglets and 236.31 kg) and LW (33.44 piglets and 235.19 kg) were higher (P<0.01) for TAD and PAD, respectively. There was statistically signifi cant effect of PN, MN and GRC x MN. Heterosis was not signifi cant. It is concluded that sows which maternal genotype are LW presented higher values for the evaluated characters

Keywords : lifetime production; heterosis.

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