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In goats, birth weight is a factor that is always taken into account in the production systems since it correlates positively with growth rate, with adult size, with the time required for the offspring reach slaughter weight and with the type of food they receive. Birth weight varies in different races to be genetically determined. There are breeders who change the race of goat focusing on the better birth weight and more early development. However, there are non-genetic factors that influence on the birth weight and early development that can lead to confusing results when comparing different races to looking offspring production of better birth weight and early development. Sex and number of litter are two non genetic factors relevant in determining birth weight, that in addition already it was demonstrated in other races. In Creole goats in addition to these, we found that age of mother, calving number of the mother, and birth month also have influence. A study of the influence of these variables on birth weight and initial development in a goat herd was conducted at the National University of Santiago del Estero. In this study the offspring were weighed at birth and during early developmental conducted in five successive calving. A pooled analysis of all variables or multivariate analyzes were applied, using the method of principal component ACP, which detect very close relations between the variables in the three major axis: 1) age of mother with calving number, 2) weight with the litter size and 3) other relationships, though weak between sex and litter size. This method, ACP, helped to summarize information and improving efficiency in the interpretation of results, bringing together animals based on the influence of the variables studied and their birth weight. Thus the groups 2 and 3 they presented the higher weights (3.18 kg and 3.4 kg respectively), and groups 1 and 4, lower weights (2.22 kg and 2.25 kg average respectively).

Empleo del análisis multivariado en la evaluación de factores no genéticos de cabras Criollas