Effects of age and repeatedly mating on litter size in Golden hamsters
In Experiment 1, golden hamsters that were mated repeatedly 6 times (Trial 1) or 4 times (Trial 2) by 43 weeks of age were analyzed with respect to litter size, body weight of offspring and sex ratio. Litter size at parturition declined at the last parity at 43 weeks of age in both trials and repeat...
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| Veröffentlicht in: | Bulletin of the Faculty of Agriculture - Hirosaki University (Japan) 1996-03 (59) |
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| container_issue | 59 |
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| container_title | Bulletin of the Faculty of Agriculture - Hirosaki University (Japan) |
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| creator | Suzuki, H. (Hirosaki Univ., Aomori (Japan). Faculty of Agriculture) Kida, R Moriguchi, M |
| description | In Experiment 1, golden hamsters that were mated repeatedly 6 times (Trial 1) or 4 times (Trial 2) by 43 weeks of age were analyzed with respect to litter size, body weight of offspring and sex ratio. Litter size at parturition declined at the last parity at 43 weeks of age in both trials and repeated mating seemed to augment the effect of age on the litter size. There were no appreciable changes in body weight of offspring and sex ration in relation to the maternal age. In Experiment 2, females were randomly assigned to 14, 24, 34 and 43 week-groups and ova were collected to examine fertilization. Although the number of ova recovered did not differ statistically among groups, percentages of normal embryos decreased significantly with advancing maternal age. It is concluded that golden hamsters begin to show a reduced ability to reproduce at a much earlier age when mated repeatedly, probably due to an increased proportion of abnormal ova |
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Faculty of Agriculture) ; Kida, R ; Moriguchi, M</creator><creatorcontrib>Suzuki, H. (Hirosaki Univ., Aomori (Japan). Faculty of Agriculture) ; Kida, R ; Moriguchi, M</creatorcontrib><description>In Experiment 1, golden hamsters that were mated repeatedly 6 times (Trial 1) or 4 times (Trial 2) by 43 weeks of age were analyzed with respect to litter size, body weight of offspring and sex ratio. Litter size at parturition declined at the last parity at 43 weeks of age in both trials and repeated mating seemed to augment the effect of age on the litter size. There were no appreciable changes in body weight of offspring and sex ration in relation to the maternal age. In Experiment 2, females were randomly assigned to 14, 24, 34 and 43 week-groups and ova were collected to examine fertilization. Although the number of ova recovered did not differ statistically among groups, percentages of normal embryos decreased significantly with advancing maternal age. It is concluded that golden hamsters begin to show a reduced ability to reproduce at a much earlier age when mated repeatedly, probably due to an increased proportion of abnormal ova</description><identifier>ISSN: 0073-229X</identifier><language>eng</language><subject>AGE ; EDAD ; EMBRIONES ANIMALES ; EMBRYON ANIMAL ; GESTACION ; GESTATION ; HAMSTER ; OVULE ; OVULO ; TAILLE DE LA PORTEE ; TAMANO DE LA CAMADA</subject><ispartof>Bulletin of the Faculty of Agriculture - Hirosaki University (Japan), 1996-03 (59)</ispartof><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,776,780</link.rule.ids></links><search><creatorcontrib>Suzuki, H. (Hirosaki Univ., Aomori (Japan). 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Although the number of ova recovered did not differ statistically among groups, percentages of normal embryos decreased significantly with advancing maternal age. It is concluded that golden hamsters begin to show a reduced ability to reproduce at a much earlier age when mated repeatedly, probably due to an increased proportion of abnormal ova</description><subject>AGE</subject><subject>EDAD</subject><subject>EMBRIONES ANIMALES</subject><subject>EMBRYON ANIMAL</subject><subject>GESTACION</subject><subject>GESTATION</subject><subject>HAMSTER</subject><subject>OVULE</subject><subject>OVULO</subject><subject>TAILLE DE LA PORTEE</subject><subject>TAMANO DE LA CAMADA</subject><issn>0073-229X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1996</creationdate><recordtype>article</recordtype><recordid>eNotzL1qwzAUQGENLTSkeYFO9wUM15JsSWMISdoSaIcM3YJ-7nUEjl0sLe3Tt9BOB77h3IkVolGNlO7jQWxKyQFRStm63q7EYc9MsRaYGfxA4KcEC32Sr5TGL7j5mqcB5gnGXCstUPI3QZ7gOI-JJrj6W_nl8iju2Y-FNv9di_Nhf949N6e348tue2pYa9twDL1GVp0zUhudpAsuIncheq2i516TcbpNLljivmuJbYgqRcmGJFpUa_H0t2U_X_yw5HJ5fXcGsUWtfgDlX0N-</recordid><startdate>199603</startdate><enddate>199603</enddate><creator>Suzuki, H. (Hirosaki Univ., Aomori (Japan). Faculty of Agriculture)</creator><creator>Kida, R</creator><creator>Moriguchi, M</creator><scope>FBQ</scope></search><sort><creationdate>199603</creationdate><title>Effects of age and repeatedly mating on litter size in Golden hamsters</title><author>Suzuki, H. (Hirosaki Univ., Aomori (Japan). Faculty of Agriculture) ; Kida, R ; Moriguchi, M</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-f448-fcb640f35972474d29b9c0f5bca43caf64e7941d9b8ef651ef8bc3dc2f7e20803</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1996</creationdate><topic>AGE</topic><topic>EDAD</topic><topic>EMBRIONES ANIMALES</topic><topic>EMBRYON ANIMAL</topic><topic>GESTACION</topic><topic>GESTATION</topic><topic>HAMSTER</topic><topic>OVULE</topic><topic>OVULO</topic><topic>TAILLE DE LA PORTEE</topic><topic>TAMANO DE LA CAMADA</topic><toplevel>online_resources</toplevel><creatorcontrib>Suzuki, H. (Hirosaki Univ., Aomori (Japan). Faculty of Agriculture)</creatorcontrib><creatorcontrib>Kida, R</creatorcontrib><creatorcontrib>Moriguchi, M</creatorcontrib><collection>AGRIS</collection><jtitle>Bulletin of the Faculty of Agriculture - Hirosaki University (Japan)</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Suzuki, H. (Hirosaki Univ., Aomori (Japan). Faculty of Agriculture)</au><au>Kida, R</au><au>Moriguchi, M</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effects of age and repeatedly mating on litter size in Golden hamsters</atitle><jtitle>Bulletin of the Faculty of Agriculture - Hirosaki University (Japan)</jtitle><date>1996-03</date><risdate>1996</risdate><issue>59</issue><issn>0073-229X</issn><abstract>In Experiment 1, golden hamsters that were mated repeatedly 6 times (Trial 1) or 4 times (Trial 2) by 43 weeks of age were analyzed with respect to litter size, body weight of offspring and sex ratio. Litter size at parturition declined at the last parity at 43 weeks of age in both trials and repeated mating seemed to augment the effect of age on the litter size. There were no appreciable changes in body weight of offspring and sex ration in relation to the maternal age. In Experiment 2, females were randomly assigned to 14, 24, 34 and 43 week-groups and ova were collected to examine fertilization. Although the number of ova recovered did not differ statistically among groups, percentages of normal embryos decreased significantly with advancing maternal age. It is concluded that golden hamsters begin to show a reduced ability to reproduce at a much earlier age when mated repeatedly, probably due to an increased proportion of abnormal ova</abstract></addata></record> |
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| identifier | ISSN: 0073-229X |
| ispartof | Bulletin of the Faculty of Agriculture - Hirosaki University (Japan), 1996-03 (59) |
| issn | 0073-229X |
| language | eng |
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| source | AgriKnowledge（アグリナレッジ）AGROLib |
| subjects | AGE EDAD EMBRIONES ANIMALES EMBRYON ANIMAL GESTACION GESTATION HAMSTER OVULE OVULO TAILLE DE LA PORTEE TAMANO DE LA CAMADA |
| title | Effects of age and repeatedly mating on litter size in Golden hamsters |
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