Growth rate and age at boar exposure as factors influencing gilt puberty |
| |
| Authors: | WS Amaral Filha ML Bernardi I Wentz FP Bortolozzo |
| |
| Institution: | 1. Universidade Federal do Rio Grande do Sul - UFRGS, Faculdade de Veterinária, Setor de Suínos, Av. Bento Gonçalves, 9090, CEP 91540-000 Porto Alegre, RS, Brazil;2. UFRGS, Faculdade de Agronomia, Departamento de Zootecnia, Av. Bento Gonçalves, 7712 CEP 91540-000 Porto Alegre, RS, Brazil;1. School of Animal and Veterinary Sciences, The University of Adelaide, Roseworthy Campus, Roseworthy, South Australia 5371, Australia;2. Robinson Institute, Research Centre for Reproductive Health, Discipline of Obstetrics and Gynaecology, The University of Adelaide, South Australia 5005, Australia;3. Pig and Poultry Production Institute, Roseworthy Campus, Roseworthy, SA 5371, Australia;1. Universidade Federal do Rio Grande do Sul (UFRGS), Faculdade de Veterinária, Setor de Suínos, Av. Bento Gonçalves, 9090, CEP 91540-000, Porto Alegre, RS, Brazil;2. Universidade Federal de Pelotas (UFPEL), Faculdade de Veterinária, CEP 96010-900, Capão do Leão, RS, Brazil;3. UFRGS, Faculdade de Agronomia, Departamento de Zootecnia, Av. Bento Gonçalves, 7712, CEP 91540-000 Porto Alegre, RS, Brazil;1. Porcine Health Management Unit, Department of Reproduction, Obstetrics and Herd Health, Faculty of Veterinary Medicine, Ghent University, 9820 Merelbeke, Belgium;2. Veterinary Epidemiology Unit, Department of Reproduction, Obstetrics and Herd Health, Faculty of Veterinary Medicine, Ghent University, 9820 Merelbeke, Belgium;3. Clinic for Swine, Ludwig-Maximilians-University, 85764 Oberschleißheim, Germany;4. PigCHAMP Pro Europa S.L., 40003 Segovia, Spain;5. The Danish Applied Pig Research Scheme, The National Committee for Pig Production, 1609 Copenhagen V, Denmark;6. Economics and Society, Natural Resources Institute Finland (Luke), 60320 Seinäjoki, Finland;7. Agriculture, School of Natural and Environmental Sciences, Newcastle University, NE1 7RU Newcastle upon Tyne, UK;1. Norsvin, 2319 Hamar, Norway;2. Felleskjøpet Agri SA, 2060 Gardermoen, Norway;3. Norwegian University of Life Sciences, Department of Chemistry, Biotechnology and Food Science, 1430 Ås, Norway;4. Norwegian University of Life Sciences, Department of Production Animal Clinical Sciences, 0454 Oslo, Norway. |
| |
| Abstract: | The objective of this study was to verify whether pubertal estrus could be influenced by the growth rate and age of gilts at the onset of boar exposure. Gilts (n = 1486) were evaluated according to two groups of age at boar exposure (A = 130-149 d and B = 150-170 d) and three classes of growth rate (Low = 550–649 g/d; Intermediate = 650–725 g/d and High = 726–830 g/d). Gilts of groups A and B were, respectively, 142.6 ± 4.9 and 157.0 ± 5.1 days of age at the onset of boar exposure. Overall, 85% of gilts showed estrus within 40 days of boar exposure. Within group A gilts a higher (P < 0.05) cumulative percentage of estrus within 20 days of stimulation was observed in High than in Intermediate and Low growth rate gilts (59.7% vs. 48.7% vs. 48.2%; P < 0.05). Nevertheless, within group B there was no difference in the percentage of estrus among growth rate classes (63.8% vs. 67.3% vs. 63.7%, P > 0.05). Within group A, puberty was attained earlier in High than in Low growth rate gilts (159.6 vs. 164.8 days). However, age at puberty was not affected by growth rate, when gilts were exposed to boar in an older age (group B). Overall, age at puberty was positively associated with the age at the onset of boar exposure (r = 0.38; P < 0.0001) and the older the gilts were at boar exposure the lower was the interval (r = - 0.19; P < 0.0001) from stimulation to onset of puberty. In conclusion, successful stimulation of puberty can be obtained through an earlier exposure to boars in high growth rate gilts. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
