Composición y biomasa fitoplanctónica en zona riparia y lagunar-estuarina del Río San Pedro, Nayarit (2008-2009)

Abstract

The purpose of this work was to evaluate the productive behavior of sows in a semi-technical farm. F1 York x Landrace sows were used as the maternal line and were inseminated with Pietrain semen as the paternal line. 13 contemporary litters were considered.Litter size was recorded at birth, weights at birth and at weaning, as well as weaned piglets and the information was recorded in the pigchamp © program. Considering the information of all the sows in this study, the size of the litter at birth and the weight at birth can be considered relatively good compared to those obtained in other studies. The results in the correlations according to the number of sows birth, indicated the existence of a high and positive correlation with all the study variables, similar to that obtained by Murillo et al. (2007), which highlights the use of these variables as indicators of the maternal productivity of sows, which increases in each birth.