Evaluation of smallholder pig production systems in North Vietnam:: Pig production management and pig performances

This study investigated the productive adaptability of pig breeds under different smallholder production conditions in Vietnam, comparing an indigenous with a Vietnamese improved breed. Fieldwork was conducted in four villages with different remoteness in North Vietnam from 2001 to 2002, in 64 households keeping the improved Mong Cai or indigenous Ban as sow breeds and progeny for fattening. Four visits per farm yielded 234 structured interviews. Reproductive performances were derived from 135 litters. Individual weights of pigs (n=755) were obtained. Data were analysed by regression, linear and generalised linear, especially loglinear models. Two distinct pig production systems were identified, that differed in remoteness, market access, resource availability, distribution of pig breeds and pig production intensity. Higher performances of 1.4 and 1.5 litters year(-1), 8.4 and 8.4 piglets weaned litter(-1), 66.6 and 93.0 kg piglets weaned sow(-1) year(-1), and 136 and 177 g day(-1) ADG were found in two villages near town with semi-intensive production conditions and a high rate of improved Mong Cai sows and MC and LW x MC offspring in the observed population. Lower performances of 1.1 and 1.1 litters year 1, 4.6 and 5.5 piglets weaned litter 1, 20.5 and 30.9 kg piglets weaned sow(-1) year(-1), and 66 and 85 g day(-1) ADG were observed in parallel to higher incidences of indigenous Ban pigs away from town under extensive conditions. Total live weight offtake per household per year was higher near town and in one village distant to town. MC and LW x MC remained even under demand-driven conditions below the performance potential reported for improved genotypes. Under resource-driven conditions with a saving-oriented production pattern, the higher-yielding but more demanding Mong Cai might not be an efficient production alternative as a further performance reduction can be assumed. A considerable live weight output was observed under resource-driven conditions and with a higher percentage of crossbred LW x Ban offspring in the population, possibly representing a promising production alternative. Factors influencing the performance expression of pigs, and the suitability of different methods for the assessment of performance parameters on-farm are discussed. (c) 2006 Elsevier B.V. All rights reserved.