Abstract:
The objective of this paper was to estimate the
optimum moment of selection for reproduction of young sows, which is a
significant animal breeding factor, represented by the registration of the
respective animals on a scale of body weight, in correspondence with the
biological age. The results of experiments conducted on young sows for
reproduction have registered differences between groups, as concerns the
reproductive indices, resulting in the reconsideration of the notion of the
optimum moment of their selection for reproduction. The weight of young
sows at the first fertile covering has influenced the reproduction activity, at
different degrees, indifferently of studied breed or synthetic line. The young
sows with body weight between 90-100 kg and over 100 kg, have obtained
additional values at main studied reproductive parameters: fecundity,
prolificacy, number of viable pigs, sucking capacity and weight of pigs
group at weaning. The influences due to the age of first covering presented
some aspects concerning the percentage of parturient, non-pregnant
females, the percentage of abortions and pregnant young sows eliminated
from the stock. The main reproductive parameters varied according to the
age of first fertile coverings, indifferently of breed or synthetic line.
