Productivity of the sow: Factors Affecting Litter Size
The objective of this study was to evaluate the effect of the genetic type of the sow (TG), the calving season (EP), the calving number (PN), and the establishment € on the reproductive performance of the sow, during lactation , measured by the characters: total births (NT), live births (NV), perinatal mortality (PM), litter mortality at 21 days (V21) and at weaning, 56 days (DV) and on the duration of the gestation (DG). For this, the data of 879 litters born in the 1979-90 period were used, from the records of two breeding farms in Uruguay: Faculty of Agronomy and “La Carolina” Agrarian School. The general averages and their standard errors were: NT = 9.84 (0.12), NV = 8.56 (0.289), MP = 11.4% (0.39), V21 = 7.57 (0.273), VD = 7.14 (0.259) and DG = 114.5 (1.69 ). From the data analysis it appears that: a0 litter size (NT, NV, V21, or VD) is affected by E, TG, and NP); b) perinatal mortality due to PD, TG, and PN and c) the duration of gestation due to PD and TG. It is concluded that: 1) the litter size at weaning is affected by the genetic type and age of the sow, with a very marked effect of management (E); 2) Duroc Jersey sows have a shorter gestation than the other genetic types studied.
Copyright (c) 1994 Hugo Juan Petrocelli, Roberto Bauza, Jorge Sánchez
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