Fixed-time post-cervical artificial insemination in sows receiving porcine luteinising hormone at oestrus onset |
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| Affiliation: | 1. Universidade Federal do Rio Grande do Sul – UFRGS, Faculdade de Veterinária, Setor de Suínos, Av. Bento Gonçalves, 9090, 91540-000 Porto Alegre, RS, Brazil;2. UFRGS, Faculdade de Agronomia, Departamento de Zootecnia, Av. Bento Gonçalves, 7712, 91540-000 Porto Alegre, RS, Brazil;1. School of Agriculture, Meiji University, Higashi-mita 1-1-1, Tama-ku, Kawasaki, Kanagawa 214-8571, Japan;2. PigCHAMP Pro Europa S.L., c/Santa Catalina 10, 40003 Segovia, Spain;1. Department of Medicine and Animal Surgery, Faculty of Veterinary Medicine, University of Murcia, Murcia, Spain;2. R&D Department of AIM iberica, Topigs Norsvin, Madrid, Spain;3. Department of Clinical and Experimental Medicine (IKE), Linköping University (LiU), Linköping, Sweden;1. Department of Animal Science, University of Illinois, Urbana, Illinois, USA;2. JBS United Animal Health, Sheridan, Indiana, USA;1. Department of Animal Sciences, University of Illinois,1207 West Gregory Drive, Urbana, IL, 61801, USA;2. JBS United Animal Health LLC, Sheridan, IN, USA;3. L&R Research Associates, Watkinsville, GA, USA;1. Department of Veterinary Medical Science, University of Parma, Parma, Italy;2. Institute of Animal Reproduction and Food Research, Polish Academy of Sciences, Olsztyn, Poland;3. School of Animal and Veterinary Sciences, University of Adelaide, Roseworthy, SA, Australia |
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| Abstract: | Fixed-time post-cervical artificial insemination (FTPCAI) allows a wider use of high indexing boars and a considerable reduction in labour requirements in swine production. The aim of this study was to evaluate fixed-time artificial insemination (FTAI) efficiency using different artificial insemination protocols and porcine luteinising hormone (pLH) to induce ovulation. A total of 597 weaned sows in which oestrus detection was performed once daily (08:00 am) was allocated to three groups: FTPCAI1 (n = 199) – sows received a 5-mg (4 ml) intramuscular injection of pLH at oestrus onset, and were inseminated 24 h later; FTPCAI2 (n = 199) – sows received 5 mg of pLH and were inseminated at oestrus onset (0 h) and 24 h after; and MultPCAI (n = 199) – sows did not receive pLH, and the first AI was performed at oestrus onset (0 h) and repeated every 24 h during oestrus. Homospermic doses (1.5 × 109 total sperm cells/50 ml) were used in post-cervical artificial insemination (PCAI) in all the treatments. Hormonal treatment did not affect (P > 0.05) the interval between oestrus onset and ovulation (overall 32.4 h) and there were no differences (P > 0.05) in farrowing rate (overall 91.6%) or litter size (overall 12.6 piglets born) among treatments. In sows treated with pLH at oestrus onset, a single PCAI with 1.5 billion sperm cells did not compromise reproductive performance compared with a double PCAI at 24 h intervals. |
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| Keywords: | Swine Fixed-time insemination Porcine luteinising hormone Ovulation Post-cervical insemination |
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