Single administration of a progesterone preparation during early gravidity of gilts following synchronized ovulation and induction of puberty to lower the age of first insemination
Heinze, A.; Schlegel, W.
Archiv für Experimentelle Veterinarmedizin 35(2): 171-176
1981
ISSN/ISBN: 0003-9055 PMID: 7195694 Document Number: 169863
The action of one single injection of 62.5 mg of hydroxy-progesterone-capronate on the 14th day after first insemination was tested for the purpose of defining the fertility performance of 180 gilts with synchronised ovulation and induced puberty. Synchronised ovulation caused significant rise in litter size and enhancement in gravidity rates. By comparison with a control group, the number of piglets born additional to each first insemination was 2.3. Induction of puberty to lower first-insemination age was of significant positive effect only on the pregnancy result, and somewhat fewer piglets were actually born. Nevertheless, the surplus birth figure to each first insemination was 2.1, as compared to untreated sows. The positive effect on puberty-induced animals was inversely proportional to daily weight rise.