Resumen

MURILLO GALAN, Carolina; HERRADORA LOZANO, Marco Antonio  y  MARTINEZ GAMBA, Roberto. Relación entre la pérdida de grasa dorsal de Cerdas Lactantes con el consumo de alimento, tamaño de la camada, peso de los Lechones al destete y días de Lactancia. Rev. Cient. (Maracaibo) [online]. 2007, vol.17, n.4, pp.380-385. ISSN 0798-2259.

Relation Between Back Fat Loss in Lactating Sows and Feed Consumption, Litter Size, Piglet’s Weight at Weaning and Lactation Days. ABSTRACT The aim of this project was to evaluate the difference of backfat thickness before the birth and at the weaning, of it, 656 reproductive sows was used of the following breeds: Duroc, Landrace, Yorfkshire, F1 (Y x L) and F2 (D x YL), in which two measurements of the back fat were taken: one week before the birth and the other one at the weaning to evaluate: breed’s effect (R), farrow number (NP), the sow’s consumption of food during the lactation (CAL), size of the litter at the weaning (TCD), gain weight of the litter during the lactation period (GPCL) and lactation days (DL), all this related to the difference between back fat at the moment to enter into the farrowing room and at the moment to come out of the farrowing room. It was showed that the sow’s breed doesn’t affect the fat difference (P>0.05), but the farrow number has an influence increasing such variable, particularly first and second farrow animals (P<0.05). For the exit backfat the gilts showed a low quantity of fat (P<0.01) and such variable is related to the food consumption (P<0.05) and the weaned piglets (P<0.01). Finally it was determined that a greater litter size at weaning (R=0.982) and also a greater gain weight of the piglets (R=0.937) there is a grater loss of backfat in the sow. To prevent an excessive loss of the body reserves that can have an effect in the following reproductive cycles, it is recommended to establish a measurement of back fat at the beginning and at the end of the lactation period as parameter of measurement. With gilts it is recommended to optimize the age and weight at the first mating.

Palabras clave : Sows; backfat; lactation.