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Poster Abstracts
Author(s) -
Catone G,
Russo M,
Scrollavezza P,
Tambella A,
Vullo C,
Basile M
Publication year - 2005
Publication title -
reproduction in domestic animals
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.546
H-Index - 66
eISSN - 1439-0531
pISSN - 0936-6768
DOI - 10.1111/j.1439-0531.2005.00590.x
Subject(s) - citation , information retrieval , computer science , world wide web , library science
s of posters Session IV LACTATIONAL OESTRUS IN INTERMITTENTLY SUCKLED SOWS: PERI-OVULATORY HORMONES, FOLLICLE DEVELOPMENT AND OVULATION R. Gerritsen, N.M. Soede, P. Langendijk, S.J. Dieleman, B. Kemp Animal Sciences Group, Wageningen University, PO Box 338, 6700 AH Wageningen, The Netherlands, Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, PO Box 80151, 3508 TD Utrecht, The Netherlands Intermittent Suckling (IS) can induce lactational oestrus in sows. This study examines the quality of lactational oestrus by studying peri-ovulatory hormones, follicle development and ovulation. Multiparous “TOPIGS 40” sows were allocated to a Control group (C) weaned at D21 of lactation (n=23), or to one of two IS groups. Sows and piglets were separated for 12 h and reunited for 12 h (IS12; n=14) or separated for 6 h and reunited for 6 h (IS6; n=13) continuously from D14 of lactation until D23 after ovulation. Oestrus detection was performed without a boar. Lactational oestrus occurred in 100% of IS12, 92% of IS6 and 26% of C sows before D22 of lactation. The remaining 74% of C sows showed oestrus within 7 days after weaning. Ovulation occurred in 93% of IS12, 83% of IS6 and 100% of C sows, which showed oestrus after start of IS/weaning. Cystic follicles were present in non-ovulating oestrous sows. Duration of oestrus was longer for C (70±5 h; LSM±SE) than for IS6 sows (48±8 h; P=0.06); IS12 sows were intermediate (61±6 h). No differences were found in follicle development, ovulation rate or oestradiol levels, or in onset of oestrus or time of ovulation relative to start of IS/weaning. LH peak tended to be higher in C sows (8.38±1.24 ng/ml) than in IS12 sows (5.1±0.48 ng/ml; P=0.08). Progesterone levels rose faster in C sows than in IS12 and IS6 sows (at 75 h after ovulation: 17.1±0.9 ng/ml vs 8.8±1.0 ng/ml vs 7.0±1.2 ng/ml; P<0.01). Thus, lactational oestrus was easily induced in these sows, but the process of ovulation seemed to be affected by IS based on peri-ovulatory hormones and cystic follicles.