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1 F h h h h h hh h h h h h h h F PGF AI AI PGF.... AI AI AI AI AI,,, AI AI F PGF PGF AI, PGF AI PGF h h h hh FAX hh tomoko_nakata@pref.aichi.lg.jp 119

2 AI AI Ln ; Wn ;LW n mm PGF.. PGF mg PG n PGF IU IU n PGF IU IU P E LH FSHP LH FSH P..LH.. FSH.. E Noguchi PGF.. /ml AI n PGF.. n n AI n.. AI SAS SAS Inc, Cary, NC, U.S.A.General Linear Models procedure ANOVA Tukey Fisher P. PG.. PG PG P. PG PG b a hr a b P

3 b a a b m ab a a b a b P kg A ng/ml C LH ng/ml PGF 2 PG PGF 2 B pg/ml D FSH ng/ml PGF 2 PGF 2 n PG n A B C LHD FSH PGF PG PGF PGF LH PG LH.. LH Day..Day..Day..Day P PG 121

4 P. PG P Day. Day.Day P. Day. Day.Day. E PG P. PG E Day. Day.. P. E LH Day.Day.. PG P. PG LH Day Day. P. FSH Day.Day.Day. PG P. PG FSH Day. Day. P. LH FSH AI P. P. AI AI PGF AI AI PGF PGF, PGF PG LH PGF LH, Ten Haff. mm.. mm P E mm P PG PGF P E PG LH PG P LH LH PG LH LH LH P LH AI, AI, AI. AI AI 122

5 AI AI AI PGF AI PGF AI AI AI AI Nissen AK, Soede NM, Hyttel P, Schmidt M, D Hoore L : The influence of time of insemination relative to time of ovulation on farrowing frequency and litter size in sows, as investigated by ultrasonography, Theriogenology,, h ( ) Bortolozzo FP, Uemoto DA, Bennemann PE, Pozzobon MC, Castagna CD, Peixoto CH, Barioni W Jr, Wentz I : Influence of time of insemination relative to ovulation and frequency of insemination on gilt fertility, Theriogenology,, h ( ) Soede NM, Wetzels CC, Zondag W, de Koning MA, Kemp B : Effects of time of insemination relative to ovulation, as determined by ultrasonography, on fertilization rate and accessory sperm count in sows, J Reprod Fertil,, h ( ) Almeida FR, Novak S, Foxcroft GR : The time of ovulation in relation to estrus duration in gilts, Theriogenology,, h ( ) Soede NM, Noordhuizen JP, Kemp B : The duration of ovulation in pigs, studied by transrectal ultrasonography, is not related to early embryonic diversity, Theriogenology,, h ( ) Soede NM, Kemp B : In synchronized pigs, the duration of ovulation is not affected by insemination and is not a determinant for early embryonic diversity, Theriogenology,, h ( ) Soede NM, Kemp B : The accessory sperm count is related to early embryonic diversity in pigs, Theriogenology,, h ( ) Noguchi M, Yoshioka K, Itoh S, Suzuki C, Arai S, Wada Y, Hasegawa Y, Kaneko H : Peripheral concentrations of inhibin A, ovarian steroids, and gonadotropins associated with follicular development throughout the estrous cycle of the sow, Reproducion,, h ( ) Pusateri AE, Wilson ME, Diekman MA : Maternal recognition of pregnancy in swine. II. Plasma concentrations of progesterone and,-dihydro-keto-prostaglandin F, during the estrous cycle and during short and long pseudopregnancy in gilts, Biol Reprod,, h ( ) Ten Haff W, Thacker PA, Kirkwood RN : Effect of injecting gonadotrophins during the luteal phase of the estrous cycle on the inter-estrus interval of gilts, Can J Anim Sci,, h ( ) Wongkaweewit K, Prommachart P, Raksasub R, Buranaamnuay K, Techakumphu M, De Rensis F, Tummaruk P : Effect of the administration of GnRH or on time of ovulation and the onset of estrusto-ovulation interval in sows in Thailand, Trop Anim Health Prod,, h ( ) Soede NM, Raaphorst CJ, Bouwman EG, Kirkwood RN : Effects of injection of during the estrous cycle on follicle development and the inter-estrous interval, Theriogenology,, h ( ) Ferguson EM, Ashworth CJ, Edwards SA, Hawkins N, Hepburn N, Hunter MG : Effect of different nutritional regimens before ovulation on plasma concentrations of metabolic and reproductive hormones and oocyte maturation in gilts, Reproduction,, h ( ) 123

6 Fixed-Time Artificial Insemination Protocol after Treatment for Synchronization of Ovulation with a Combination of Prostaglandin F and Gonadotropins in Pigs Tomoko NAKATA ), Yoko TAJIMA ), Michiko NOGUCHI ), Yoshihisa UENOYAMA ), Satoshi OHKURA ), Kei-Ichiro MAEDA ), Chie SUZUKI ) and Koji YOSHIOKA ) ) Aichi Livestock Industry Division, Sannomaru 3h1h2, Naka-ku, Nagoya, 460h8501, Japan ) Nishimikawa Prefectural Agriculture and Fisheries Office, Sakaime 1, Ikeura-cho, Anjyo, 446h0066, Japan ) Kagoshima University Joint Faculty of Veterinary Medicine, Korimoto 1h21h24, Kagoshima, 890h0065, Japan ) Nagoya University Graduate School of Bioagricultural Sciences, Furocho, Chikusa-ku, Nagoya, 464h8601, Japan ) Tokyo University Graduate School of Agricultural and Life Sciences, Yayoi 1h1h1, Bunkyo-ku, 113h8657, Japan ) National Institute of Animal Health, National Agriculture and Food Research Organization, Kannondai 3h1h5, Tukuba, 305h0856, Japan To establish a fixed-time artificial insemination (AI) protocol in pigs after treatment for synchronization of ovulation with a combination of prostaglandin F 2 (PGF 2 ), equine chorionic gonadotropin and human chorionic gonadotropin (), we investigated the reproductive hormone profiles and ovulation in the synchronized sows and determined a satisfactory timing for a single AI to provide sufficient reproductive performance. Plasma progesterone concentrations significantly decreased on the day following PGF 2 treatment. A preovulatory surge of luteinizing hormone was observed in all synchronized sows, peaking at hours after treatment, and ovulation was detected at hours after treatment. When a timed AI was performed once at 24 or 36 hours after treatment, normal blastcysts were collected from all of the synchronized pigs. Moreover, farrowing rate and average litter size did not differ between the synchronized pigs inseminated once at 24 or 36 hours after treatment and cyclic pigs inseminated multiple times during natural estrus. Key words : fixed-time artificial insemination, ovulation synchronization, pig. Correspondence to : Tomoko NAKATA (Aichi Livestock Industry Division) Sannomaru 3h1h2, Naka-ku, Nagoya, 460h8501, Japan TEL 052h954h6426 (ext. 3708) FAX 052h954h tomoko_nakata@pref.aichi.lg.jp J. Jpn. Vet. Med. Assoc.,, ( ) 124