Japanese Journal of Veterinary Research;Volume 29, Number 1-2

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OVARIAN RESPONSE AFTER FOUR CONTINUOUS ADMINISTRATIONS OF GONADOTROPHIN IN BEEF CATTLE

KANAGAWA, Hiroshi;ISHIKAWA, Tsune;INOUE, Tadahiro

Permalink : http://hdl.handle.net/2115/2210
JaLCDOI : 10.14943/jjvr.29.1-2.1

Abstract

After 4 repeated treatments of gonadotrophin, 8 beef cattle showed an average of 12.1,10.1,12.1 and 8.4 corpora lutea at the 1st, 2nd, 3rd and 4th treatments, respectively. However, different dosages of gonadotrophin ranging from 1,600 to 3,500IU of pregnant mare's serum gonadotrophin (PMSG), were used. "The average number of corpora lutea decreased from 12.4,8.4,9.8 and 6.0 during the 1st, 2nd, 3rd and 4th treatments respectively, when the same dose of PMSG (2,000 IU) was used. However, there was no significant difference in the number of corpora lutea among the 4 treatments observed statistically (P>0.05). In one case, there was an increase in the number of corpora lutea after the PMSG was changed to a follicle stimulating hormone (FSH). There was a significant difference in the average number of corpora lutea when the interval between administrations was less than 60 days or more than 70 (P<0.001). The number of follicles and corpora lutea were analysed statistically. There was no significant difference in the rank correlation between the follicle and the corpus luteum in each treatment.

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