Repeatable results were observed in other studies analysing the number of piglets
born alive linked to parity number. Tummaruk et al. (2000) and Suriyasomboon et
al. (2006) noted the highest number of piglets born for parity 4–6 and the lowest
for primiparous sows, also in crossbred sows. This could be explained by more follicles
ovulating, uterus capacity and the age of the sows. In our study, the period of
insemination was divided into months. The first four months of the year were probably
characterized by a greater number of fertilized oocytes, a consequence of which
was a higher number of piglets born after the gestation time. In the next months thistrend was not continued and similar results between primiparous and other parities
were observed. On this basis it is possible to suggest that gilts reacted more to
environmental conditions in the winter than in the summer-autumn. Therefore, low
temperatures had a stronger influence on the young female body than was the case
with high ones. Similarly, the bodies of older sows were more influenced by high
temperatures during insemination, which resulted in a lower number of piglets born
alive. This observation should be continued in future studies, particularly in relation
to crossbred sows.
Repeatable results were observed in other studies analysing the number of pigletsborn alive linked to parity number. Tummaruk et al. (2000) and Suriyasomboon etal. (2006) noted the highest number of piglets born for parity 4–6 and the lowestfor primiparous sows, also in crossbred sows. This could be explained by more folliclesovulating, uterus capacity and the age of the sows. In our study, the period ofinsemination was divided into months. The first four months of the year were probablycharacterized by a greater number of fertilized oocytes, a consequence of whichwas a higher number of piglets born after the gestation time. In the next months thistrend was not continued and similar results between primiparous and other paritieswere observed. On this basis it is possible to suggest that gilts reacted more toenvironmental conditions in the winter than in the summer-autumn. Therefore, lowtemperatures had a stronger influence on the young female body than was the casewith high ones. Similarly, the bodies of older sows were more influenced by hightemperatures during insemination, which resulted in a lower number of piglets bornalive. This observation should be continued in future studies, particularly in relationto crossbred sows.
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