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Contraceptive Effect of Proligestone on Spotted Seals and Crossbreeds of Spotted Seals and Harbor Seals

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Contraceptive Effect of Proligestone on Spotted Seals and Crossbreeds of Spotted Seals and Harbor Seals FULL PAPER Theriogenology Contraceptive Effect of Proligestone on Spotted Seals and Crossbreeds of Spotted Seals and Harbor Seals Etsuko KATSUMATA1), Tatsuya HORI2) and Toshihiko TSUTSUI2)* 1)Kamogawa Sea World, 1464–18 Higashi-cho, Kamogawa-shi, Chiba 296–0041 and 2)Department of Reproduction, Nippon Veterinary and Animal Science University, 7–1 Kyonan-cho 1 chome, Musashino-shi, Tokyo 180–8602, Japan (Received 1 October 2001/Accepted 10 February 2003) ABSTRACT. Spotted seals (Phoca largha) and related crossbreeds maintained at Kamogawa Sea World breed seasonally from the end of January to middle of March. For contraception in these animals, the effect of a single administration of a contraceptive synthetic luteal hormone for dogs, proligestone (PRG), was investigated. The animals tested were 10 seals aged 4–24 years old, and a total of 35 trials were performed over five years. PRG was administered in 23 trials during January, which was one month before the estimated estrus, and in 12 trials during December of the previous year, which was two months before the estimated estrus. The dose of PRG was 5 mg/ kg in 32 trials and 10 mg/kg in 3 trials. The effect of the contraception was judged by the presence or absence of delivery. Among 23 animals treated in January, 2 animals treated with 5 mg/kg PRG became pregnant, but the contraception was successful in the other 21 animals. Contraception was successful in all 12 trials treated with 5 mg/kg PRG in December. Overall, contraception was successful in 94.3% (33/35). Therefore, a single administration of 5 mg/kg PRG in December may be an effective method of contraception for seals. KEY WORDS: estrus prevention, proligestone, seal. J. Vet. Med. Sci. 65(5): 619–623, 2003 Although aquariums try to breed Pinnipeds, the capacity of progesterone (P4) and estradiol-17β (E2) levels during of breeding facilities is limited and a method of scheduled gestation and non-gestation periods in harbor seals [8]. reproduction that maintains genetic variety is important. According to this report, the P4 level is high even during the Moreover, the conception rate among seals increases when period of delayed implantation, and the blood P4 level is different species are kept together [1, 5, 9, 13]. Thus, con- high during the late gestation period due to P4 secretion from traception is required to prevent crossbreeding. However, the placenta. The blood P4 level in non-pregnant animals studies using hormones for contraception in seals have not shows a course similar to that during the early gestation progressed [12]. period, but the level decreases within about six months. Spotted seals (Phoca largha) and harbor seals (Phoca vit- These findings suggest that pregnancy may be diagnosed by ulina) are monoestrous animals with spontaneous ovulation, measuring the blood P4 level six months after estrus and and are seasonal breeders with delayed implantation [2, 3]. thereafter [3]. Furthermore, seals become reproductive at 4 years old [2, A common contraceptive method using a drug is the 5]. Spotted seals and kuril harbor seals inhabiting Hokkaido administration of synthetic luteal hormone. Synthetic luteal enter estrus in April and June, respectively, subsequently hormone includes chlormadinone acetate [11], an implant becoming pregnant and delivering their young [5, 7]. In developed for dogs, and proligestone (PRG) for injection Kamogawa Sea World (Kamogawa, Chiba, Japan), non- [14]. However, the implant was developed for long-term pregnant seals enter estrus from the end of January to the contraception over 1–2 years and requires anesthesia for middle of March, although this varies annually (unpublished subcutaneous implantation and excision. PRG is injected data). Males are also seasonal breeders, as shown by histo- subcutaneously at 3–5 month intervals in dogs. Thus, in logical findings of the testis and the peripheral blood test- non-pregnant seals in our aquarium, a single injection may osterone level [2, 4]. The age of sexual maturity, initiation inhibit estrus during the breeding season between January of the breeding season, and the duration of delayed implan- and March. The dose of PRG for subcutaneous administra- tation are considered to be affected by light, temperature, tion is 20 mg/kg in dogs, and the dosing volume for a large and nutritional conditions. The delivery period in spotted dog is less than 6 ml (600 mg). Thus, we estimated a dose seals and crossbreeds of spotted seals and harbor seals is of 5 or 10 mg/kg for seals weighing about 100 kg. February-March in our aquarium (Table 1), and estrus onset In this study, we administered a single dose of PRG to occurs soon after delivery. spotted seals and related crossbreeds, then investigated the There are 18 species of seals known to date, but little has contraceptive effect. been clarified regarding the endocrinology related to repro- ductive physiology. There is one report on the time courses MATERIALS AND METHODS *CORRESPONDENCE TO: TSUTSUI, T., Department of Reproduction, Animals: The animals used were 10 female spotted seals Nippon Veterinary and Animal Science University, 7–1 Kyonan- and crossbreeds of spotted seals and harbor seals kept at cho 1-chome, Musashino-shi, Tokyo 180–8602, Japan. Kamogawa Sea World. The age, body weight, and past 620 E. KATSUMATA, T. HORI AND T. TSUTSUI Table 1. Animals tested Birthday Body weight No. ♂ × ♀ (Breed) Parityc) (age)a) (kg)b) 1. Spotted Seals (Wild) 1971 (25) 116 9 2. Spotted Seals – 1979.3.5 (15) 104 2 3. Crossbreed Spotted Seals × Harbor Seals 1979.3.7 (15) 120 2 4. Crossbreed Spotted Seals × Harbor Seals 1982.2.26 (12) 117 1 5. Crossbreed Crossbreed × Crossbreed 1984.2.14 (10) 90 1 6. Crossbreed Crossbreed × Harbor Seals 1984.3.5 (10) 101 1 7. Spotted Seals – 1987.3.18 (7) 86 0 8. Crossbreed Crossbreed × Crossbreed 1991.2.24 (4) 75 0 9. Crossbreed Crossbreed × Crossbreed 1991.3.7 (4) 80 0 10. Crossbreed Crossbreed × Spotted Seals 1995.2.19 (3) 64 0 a), b), c): Age, body weight, and past delivery at the time the experiment was initiated. Table 2. Temperature and water temperature of outdoor environment in the animal facility for seals (°C, 1994– 1999) January February March April May June range 7.0–9.2 7.6–8.9 9.5–12.5 13.5–16.9 17.9–20.2 20.8–21.7 Temperature Mean 8.2 8.3 10.8 15.3 18.9 21.1 ± SE 0.4 0.2 0.4 0.5 0.4 0.2 Water range 12.8–15.0 12.8–4.7 13.4–16.8 15.7–18.2 18.9–20.9 21.5–24.3 Mean 13.6 13.3 14.4 17.0 19.8 22.4 temperature ± SE 0.3 0.3 0.6 0.5 0.4 0.5 July August September October November December range 23.9–26.7 24.9–29.3 22.4–27.2 18.1–23.1 14.5–16.9 10.6–11.2 Temperature Mean 24.7 27.3 24.4 20.7 15.8 11.0 ± SE 0.5 0.7 0.9 0.7 0.4 0.1 range 22.3–27.6 24.5–28.9 23.7–28.1 20.3–24.6 17.9–21.0 14.5–16.6 Water Mean 24.7 26.7 25.6 22.6 19.1 15.6 temperature ± SE 0.9 0.8 0.9 0.8 0.6 0.5 deliveries of the animals are shown in Table 1. No. 1 was Dose and timing of proligestone administration and wild-born and the other 9 animals were born and raised in observation of adverse effects: PRG used in the experiment our aquarium. Males and females were kept separated was a commercial estrus prevention agent for dogs (Kobi- before initiation of this experiment. nan®, Sankyo Co., Ltd., Tokyo, Japan). The doses were 5 The mean temperature and mean water temperature for and 10 mg/kg PRG. A total of 35 trials in 10 animals were each year and month in the outdoor environment of this made over five years. Of these 35 trials, 32 used 5 mg/kg study (1994–1999) are shown in Table 2. The animal facil- PRG and the other 3 used 10 mg/kg PRG. ity measured 61.6 m2 with a 1.5 m water depth. Overall, 11– PRG was administered to 6, 8, and 9 animals in January, 15 animals were kept in this facility. The water was chlori- which was one month before the estimated starting time of nated natural sea water (0.4 ppm chlorine). The animals the breeding season, in 1994, 1995, and 1996, respectively. were fed 3–6 kg of defrosted mackerel, Atka mackerel, and For estrus in 1997 and 1999, PRG was administered to 7 and smelt, in the morning and evening daily. 5 animals in December of the previous year, 1996 and 1998, To obtain reference values for the experiment, blood was respectively, which was two months before the estimated collected from five animals (non-treatment group) for mea- starting time of the breeding season. All animals, excluding surement of the blood P4 level during the gestation and non- No. 10, received repeated contraceptive treatment for 2–5 gestation periods. The time-course of the blood P4 level was consecutive years. Males and females were kept separate observed in three seals used in this experiment (Nos. 1, 2, before the experiment. PRG was subcutaneously injected to and 3) and in No. 11 and No.12 during the gestation period the root of the tail. The blood P4 level was confirmed to be eight times in three pregnant animals and the non-gestation 1.0 ng/ml or lower before administration of PRG to ascer- period seven times in four animals between 1982 and 1994.
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