{"title":"交配期和雌性妊娠期对美国养殖水貂(neovison vison)幼崽性别比影响的研究","authors":"L. Felska-Błaszczyk, B. Seremak, Natalia Ławrów","doi":"10.21005/asp.2020.19.1.02","DOIUrl":null,"url":null,"abstract":"The aim of the study was to analyze the sex ratio of the American mink ( Neovison vison) kits, in relation to a range of factors. The observations were carried out on yearling females of two color varieties, Perl (P) and White Hedlund (WH). The sex of the kits was identified at age of approx. 30 days, and only complete (zero-mortality) litters were selected in this study. The sex ratio of the cubs in the litters was compared to the length of pregnancy they were born from, the date of the first mating, and the interval between the first and the subsequent mating. Along with a longer pregnancy, a later date of mating and a longer interval between the first and subsequent mating, the number of born females in relation to born males increases.","PeriodicalId":30932,"journal":{"name":"Acta Scientiarum Polonorum Zootechnica","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2020-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A STUDY OF THE SEX RATIO OF NEWBORN FARMED AMERICAN MINKS (NEOVISON VISON) INFLUENCED BY MATING TERM AND DURATION OF PREGNANCY OF FEMALES\",\"authors\":\"L. Felska-Błaszczyk, B. Seremak, Natalia Ławrów\",\"doi\":\"10.21005/asp.2020.19.1.02\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"The aim of the study was to analyze the sex ratio of the American mink ( Neovison vison) kits, in relation to a range of factors. The observations were carried out on yearling females of two color varieties, Perl (P) and White Hedlund (WH). The sex of the kits was identified at age of approx. 30 days, and only complete (zero-mortality) litters were selected in this study. The sex ratio of the cubs in the litters was compared to the length of pregnancy they were born from, the date of the first mating, and the interval between the first and the subsequent mating. Along with a longer pregnancy, a later date of mating and a longer interval between the first and subsequent mating, the number of born females in relation to born males increases.\",\"PeriodicalId\":30932,\"journal\":{\"name\":\"Acta Scientiarum Polonorum Zootechnica\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2020-05-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Acta Scientiarum Polonorum Zootechnica\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.21005/asp.2020.19.1.02\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Acta Scientiarum Polonorum Zootechnica","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.21005/asp.2020.19.1.02","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
A STUDY OF THE SEX RATIO OF NEWBORN FARMED AMERICAN MINKS (NEOVISON VISON) INFLUENCED BY MATING TERM AND DURATION OF PREGNANCY OF FEMALES
The aim of the study was to analyze the sex ratio of the American mink ( Neovison vison) kits, in relation to a range of factors. The observations were carried out on yearling females of two color varieties, Perl (P) and White Hedlund (WH). The sex of the kits was identified at age of approx. 30 days, and only complete (zero-mortality) litters were selected in this study. The sex ratio of the cubs in the litters was compared to the length of pregnancy they were born from, the date of the first mating, and the interval between the first and the subsequent mating. Along with a longer pregnancy, a later date of mating and a longer interval between the first and subsequent mating, the number of born females in relation to born males increases.
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