Zootechnical characterization of the Mexican bald pig exploited in a genetic conservation center

[paper presented at the Ibero-American Symposium "Conservation of Zootechnical Resources"]

Abstract

The objective of this work is to assess both productive and reproductive parameters from Mexican hairless pig raised in Yucatan (Mexico), to contribute to the study of the physical characterization and to support the programme of rescue and genetic preservation of this breed. Twenty females, 5 boars and 92 piglets were considered for this study; feeding is based on commercial concentrate supplemented with fruits, some vegetables and human food rests. An oestrus control programme is carried out to detect it; sows do not receive any human assistance during farrowing. Piglets are identified and weighted within the first 24 hours post delivery and periodically until 120 days old. Results are analyzed by descriptive statistics and a growth curve was built. The mean live weight at birth is 0.86 kg and 9.6 kg at 120 days of age; the mean daily gain is in the range from 66 to 83 g depending on their age. Sorne parameters showed optimal values: fertility (94.8%), open days (68), interval between births (175.4 days); in contrast, litter size (5.7) and litter weight (4.9 kg) are smaller than those values reported for hairless pig in other areas of Mexico. Mexican hairless pig from Yucatan shows a linear, although slow, growing during the first 4 months of age. A sudden weaning, without previous control of feeding, causes a drop on growing during the first 15 post weaning days. Sows show poor productive performance but they have reproductive qualities that may be rescued.